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Author Topic: I have 4 solar panels on the roof  (Read 1445 times)

Alpena Jeff

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I have 4 solar panels on the roof
« on: October 21, 2017, 09:16:27 AM »
40"x21" each or so, thin flexible panels. No brand name that I can see. No Trimetic. Currently plugged into 15 amp shore power coming out of pole barn. 4 6v interstate deep cycle batteries. Panel from Newmar shows float charge, 13.6 volt D.C. I don't know if there's a question in here somewhere, thoughts on what I'm seeing?
Sun coming overhead soon, should I unplug from shore power and see what display panel says?
Thanks all.
Jeff
Jeff & Judy
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Allison 3000MH
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Memtb

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Re: I have 4 solar panels on the roof
« Reply #1 on: October 21, 2017, 09:38:49 AM »
   Not sure exactly what controller you have (what readouts you can see), but.... it certainly wouldn’t hurt to know what the panels are doing! Though, if  System is “fully” charged, you won’t see what the panels “ can do”!   Use up some battery, and then see how they’er doing.

    On our monitor we can monitor input, output,etc.
Todd and Marianne
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TonyDtorch

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Re: I have 4 solar panels on the roof
« Reply #2 on: October 21, 2017, 09:52:53 AM »
you don't need to unplug.  the controllers know when to stop charging.

Sprucegum

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Re: I have 4 solar panels on the roof
« Reply #3 on: October 21, 2017, 11:34:28 AM »
The 13.6 shows the float charge you are getting from your shore power. The solar won't do anything as long as you are plugged in. If you want to test your solar system unplug the shore for a day.
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Paul & Ann

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Re: I have 4 solar panels on the roof
« Reply #4 on: October 21, 2017, 12:34:04 PM »
... The solar won't do anything as long as you are plugged in...

That is not accurate in all situations.  I have my solar controller on even when I am plugged into shore power.  MY onboard charger maxes out at 14.4 volts, so my solar controller will take over and charge the batteries up to 14.8 volts to fully charge them.
Paul & Ann  Iowa
2005 Winnebago Voyage 38J
http://stoughrvadventure.blogspot.com/

AStravelers

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Re: I have 4 solar panels on the roof
« Reply #5 on: October 21, 2017, 06:02:14 PM »
40"x21" each or so, thin flexible panels. No brand name that I can see. No Trimetic. Currently plugged into 15 amp shore power coming out of pole barn. 4 6v interstate deep cycle batteries. Panel from Newmar shows float charge, 13.6 volt D.C. I don't know if there's a question in here somewhere, thoughts on what I'm seeing?
Sun coming overhead soon, should I unplug from shore power and see what display panel says?
Thanks all.
Jeff
Yes, you should disconnect from shore power while the sun is shinning during mid day and see what the panel shows.  You should see 13.4V or higher. 

For a test, unplug from shore power in the early evening after the sun is off of your solar panels.  Turn on 2-3 lights, if you have LED lights turn them all on.  Leave them on for an hour or two.  Your battery voltage should not drop below about 12.5V or so. (If the voltage drops to 12.2V in an hour or two you have weak batteries.) Turn the lights off & anything else that uses 12V for the night. (you can leave the propane fridge on)  Come back in the morning before the sun hits the panels and check the voltage.  Around 10am check the voltage, it should be a charging voltage. 

Let us know the results and we can go from there.

If you don't have a lot of experience with RV electric systems, here are two links to great info about RV elect:
http://www.marxrv.com/12volt/12volt.htm
http://www.marxrv.com/12volt/12volta.htm
Al & Sharon
2006 Winnebago Sightseer 29R
2009 Chevy Colorado 4X4

http://downtheroadaroundthebend.blogspot.com/

J_5th_wheel-is_home

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Re: I have 4 solar panels on the roof
« Reply #6 on: October 22, 2017, 01:12:44 PM »
Thank you for this post. I am about to move into my 2016 5th wheel that is wired for solar.  A bit down the road I plan on getting solar installed once life settles down a bit, get 5th wheel hitch installed in bed of pick up, get 5th wheel parked end of this month at RV resort I just put deposit down.     
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Alpena Jeff

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Re: I have 4 solar panels on the roof
« Reply #7 on: October 22, 2017, 06:34:11 PM »
Haven't got to this yet but will let you know my findings.
Thanks all.
Jeff
Jeff & Judy
2016 Newmar Ventana 3427
Cummings ISBXT turbo 6.7L 360HP
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Alpena Jeff

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Re: I have 4 solar panels on the roof
« Reply #8 on: October 27, 2017, 09:04:46 AM »
Yes, you should disconnect from shore power while the sun is shinning during mid day and see what the panel shows.  You should see 13.4V or higher. 

For a test, unplug from shore power in the early evening after the sun is off of your solar panels.  Turn on 2-3 lights, if you have LED lights turn them all on.  Leave them on for an hour or two.  Your battery voltage should not drop below about 12.5V or so. (If the voltage drops to 12.2V in an hour or two you have weak batteries.) Turn the lights off & anything else that uses 12V for the night. (you can leave the propane fridge on)  Come back in the morning before the sun hits the panels and check the voltage.  Around 10am check the voltage, it should be a charging voltage. 

Let us know the results and we can go from there.

If you don't have a lot of experience with RV electric systems, here are two links to great info about RV elect:
http://www.marxrv.com/12volt/12volt.htm
http://www.marxrv.com/12volt/12volta.htm
Been unable to test as we haven't seen the sun in a week! Stay tuned....
« Last Edit: October 27, 2017, 09:07:37 AM by Alpena Jeff »
Jeff & Judy
2016 Newmar Ventana 3427
Cummings ISBXT turbo 6.7L 360HP
Allison 3000MH
2018 Canyon All Terrain toad
"Official" snowbird!
Retired to "the lake" in north Michigan
Preachers kid since day one!

Alpena Jeff

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Re: I have 4 solar panels on the roof
« Reply #9 on: October 27, 2017, 11:17:45 AM »
Ok. When plugged into 15 amp shore power my display showed 13.6-13.8 volt. Took off shore power and after 90 minutes display shows 12.2 volt. Had inside led lights on and 2-way fridge on switched to ac power.
This sounds like week batteries right! This is a 2016 model year with 15k miles.
Also, been raining for days so no solar assist.
« Last Edit: October 27, 2017, 11:33:04 AM by Alpena Jeff »
Jeff & Judy
2016 Newmar Ventana 3427
Cummings ISBXT turbo 6.7L 360HP
Allison 3000MH
2018 Canyon All Terrain toad
"Official" snowbird!
Retired to "the lake" in north Michigan
Preachers kid since day one!

SeilerBird

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Re: I have 4 solar panels on the roof
« Reply #10 on: October 27, 2017, 11:39:48 AM »
Sounds weak to me. :(
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Paul & Ann

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Re: I have 4 solar panels on the roof
« Reply #11 on: October 27, 2017, 12:33:35 PM »
It is difficult to know what you are seeing.  The 13.6 to 13.8 volts you were seeing is the charger voltage, and not the true battery voltage. Were your batteries fully charged before unhooking from shore power?  Does your onboard charger have the capability to fully charge your batteries?  I believe some Interstate deep cycle batteries need to see 15.3 volts for a period of time to be fully charged.  How many amps does your refrigerator draw when on electric?  Also, with a load on battery voltage will show less than the true voltage of the battery.  Hopefully, those with more knowledge that I, will come along and provide more information.
Paul & Ann  Iowa
2005 Winnebago Voyage 38J
http://stoughrvadventure.blogspot.com/

Gary RV_Wizard

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Re: I have 4 solar panels on the roof
« Reply #12 on: October 27, 2017, 01:30:30 PM »
Suspicious to be sure, but as Paul & Ann noted, there are too many unanswered questions to draw any real conclusions.  The fridge alone could account for a substantial draw on the batteries if it the cooling unit run non-stop for 90 minutes (likely).

Another factor: how many and what size batteries are involved?  I'm guessing at least 200-230 AH of battery capacity, but it could be 2x that.
Gary
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Alpena Jeff

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Re: I have 4 solar panels on the roof
« Reply #13 on: October 27, 2017, 03:25:04 PM »
We have 4 Interstate deep cycle @ 232ah each and a Magnum ME 2000 Series MSW inverter/charger if that helps.
I have a lot to learn about this stuff!
« Last Edit: October 27, 2017, 03:39:23 PM by Alpena Jeff »
Jeff & Judy
2016 Newmar Ventana 3427
Cummings ISBXT turbo 6.7L 360HP
Allison 3000MH
2018 Canyon All Terrain toad
"Official" snowbird!
Retired to "the lake" in north Michigan
Preachers kid since day one!

AStravelers

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Re: I have 4 solar panels on the roof
« Reply #14 on: October 28, 2017, 06:38:42 AM »
First-- Do you have a Magnum ME 2000 or the Magnum ME 2012 inverter charger?  I am unable to find a ME 2000 inverter on an internet search. 

Second--  How long were you plugged into the 15amp shore power?  Even though you have a 100amp 3 stage charger, it still takes 6 to 12 hours to get your batteries fully charged. 

Third--  You say you turned your gas elect fridge to elect after you disconnected from shore power.  Are you really sure the fridge was actually working on elect.  Gas/elect fridge's should not be wired through the inverter.  All these fridges I know of only have 3 power settings, Off, Gas only, and Auto.  If the fridge is on the auto setting, it will default to gas if there is no 120V AC present, which there should not be if not plugged into shore power and the generator is not running. 

As long as you were plugged into shore power long enough, 6-12 hours, to charge your batteries, they should not have dropped to 12.2V in 90 minutes. 

If your fridge indeed is wired though the inverter, do this test again and after 90 minutes turn off the fridge and check your voltage.  Having a load on your batteries will cause them to show a lower voltage than the batteries would at rest.  However the load from the fridge should not drop the voltage from the fully charged voltage of 12.6V to 12.2V in 90 minutes.  Not with over 400AH of battery.

Also as you noted, when connected to shore power you are seeing 13.6-13.8 volts.  When you disconnect from shore power you should still see the 13.6V for some few to several minutes.  It should then decrease to about 12.6V which is the voltage of a fully charged battery bank. 

If you continue seeing 12.2V you should take a multi meter, and check the voltages of your individual batteries.  I'm assuming you have four 6V deep cycle golf cart batteries.  You could have one bad battery.

Have you checked the water level in the batteries?  If the water level in any of the battery cells has dropped far enough to expose the plates to the air, that is likely the cause of your problems. 
Al & Sharon
2006 Winnebago Sightseer 29R
2009 Chevy Colorado 4X4

http://downtheroadaroundthebend.blogspot.com/

Alpena Jeff

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Re: I have 4 solar panels on the roof
« Reply #15 on: October 28, 2017, 08:25:38 AM »
First-- Do you have a Magnum ME 2000 or the Magnum ME 2012 inverter charger?  I am unable to find a ME 2000 inverter on an internet search. 

Second--  How long were you plugged into the 15amp shore power?  Even though you have a 100amp 3 stage charger, it still takes 6 to 12 hours to get your batteries fully charged. 

Third--  You say you turned your gas elect fridge to elect after you disconnected from shore power.  Are you really sure the fridge was actually working on elect.  Gas/elect fridge's should not be wired through the inverter.  All these fridges I know of only have 3 power settings, Off, Gas only, and Auto.  If the fridge is on the auto setting, it will default to gas if there is no 120V AC present, which there should not be if not plugged into shore power and the generator is not running. 

As long as you were plugged into shore power long enough, 6-12 hours, to charge your batteries, they should not have dropped to 12.2V in 90 minutes. 

If your fridge indeed is wired though the inverter, do this test again and after 90 minutes turn off the fridge and check your voltage.  Having a load on your batteries will cause them to show a lower voltage than the batteries would at rest.  However the load from the fridge should not drop the voltage from the fully charged voltage of 12.6V to 12.2V in 90 minutes.  Not with over 400AH of battery.

Also as you noted, when connected to shore power you are seeing 13.6-13.8 volts.  When you disconnect from shore power you should still see the 13.6V for some few to several minutes.  It should then decrease to about 12.6V which is the voltage of a fully charged battery bank. 

If you continue seeing 12.2V you should take a multi meter, and check the voltages of your individual batteries.  I'm assuming you have four 6V deep cycle golf cart batteries.  You could have one bad battery.

Have you checked the water level in the batteries?  If the water level in any of the battery cells has dropped far enough to expose the plates to the air, that is likely the cause of your problems.

Thanks for helping Al.
First. It is a 2012. Just confirmed

Second. Was plugging in for at least 12 hours, likely longer.

Third. Just unplugged after being plugged in overnight. Inverter off and fridge which is set at auto is now running on LP. I turned the inverter on and fridge switched to AC. Turned inverter off and back to LP.
Before unplugging meter showed 13.6-13.7 volt. After 30 minutes meter showing 12.7 volts.
Yesterday I had the inverter on and like I said the fridge showed AC. Maybe that drove the voltage down? It got to 11.7 before I plugged back in for the night.
My sales guy said to just leave the inverter on. Let it do its thing.

Did check water level in batteries and we're good. Right now I'm letting it sit with fridge on propane, nothing else on.
After reading my response to your questions should I switch back to inverter and run the test you suggested?

 
Jeff & Judy
2016 Newmar Ventana 3427
Cummings ISBXT turbo 6.7L 360HP
Allison 3000MH
2018 Canyon All Terrain toad
"Official" snowbird!
Retired to "the lake" in north Michigan
Preachers kid since day one!

Alpena Jeff

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Re: I have 4 solar panels on the roof
« Reply #16 on: October 28, 2017, 12:39:23 PM »
Update.
Last 5 hours I have had all led lights on, fridge off. Everything else off. Meter shows 12.4 volts. Solar might be helping some. Cloudy here but maybe some help?
Thanks.
Jeff & Judy
2016 Newmar Ventana 3427
Cummings ISBXT turbo 6.7L 360HP
Allison 3000MH
2018 Canyon All Terrain toad
"Official" snowbird!
Retired to "the lake" in north Michigan
Preachers kid since day one!

Paul & Ann

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Re: I have 4 solar panels on the roof
« Reply #17 on: October 28, 2017, 01:52:01 PM »
Not helping at all in battery voltage is only 12.4 volts.
Paul & Ann  Iowa
2005 Winnebago Voyage 38J
http://stoughrvadventure.blogspot.com/

AStravelers

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Re: I have 4 solar panels on the roof
« Reply #18 on: October 30, 2017, 06:35:10 PM »
Thanks for helping Al.
First. It is a 2012. Just confirmed

Second. Was plugging in for at least 12 hours, likely longer.

Third. Just unplugged after being plugged in overnight. Inverter off and fridge which is set at auto is now running on LP. I turned the inverter on and fridge switched to AC. Turned inverter off and back to LP.
Before unplugging meter showed 13.6-13.7 volt. After 30 minutes meter showing 12.7 volts.
Yesterday I had the inverter on and like I said the fridge showed AC. Maybe that drove the voltage down? It got to 11.7 before I plugged back in for the night.
My sales guy said to just leave the inverter on. Let it do its thing.

Did check water level in batteries and we're good. Right now I'm letting it sit with fridge on propane, nothing else on.
After reading my response to your questions should I switch back to inverter and run the test you suggested?
Update.
Last 5 hours I have had all led lights on, fridge off. Everything else off. Meter shows 12.4 volts. Solar might be helping some. Cloudy here but maybe some help?
Thanks.
Sorry for the late response.  Thanks for the great details about the problems you are seeing. 

Bottom line it sounds like you have weak batteries. 

--  No need to have the inverter on and the fridge on as a load for testing as I suggested. Your other tests showed what I was looking for.
--  Your report that after 5 hours with fridge & lights off and your batteries dropped to 12.4V.  That is not good if your batteries had been charged overnight. You could have weak batteries.  Possibly because they were discharged too low by the fridge running off the inverter.  It is possible you have something in the RV pulling 5 to 10 amps.  However with 400+ AH of battery that shouldn't drop your battery voltage to something like 12.4V in 5 hours. Especially if your batteries in good condition.  You would need a amp meter to check to be sure you don't have a phantom load someplace. 
-- Listened to your salesman, did you? Hmm.  :)  Well the salesman isn't totally wrong.  The inverter/battery setup works pretty good assuming you limit the time to being unhooked from shore power to 6-8 hours.  And if your batteries are new or in good condition.

Assuming your batteries are original they are now 5 years old and probably in need of replacement.  However if you always stay at places with elect hookups the batteries may last another couple of years.  That is as long as you are sure to have the fridge on propane while you are disconnected from shore power.

You are a good example on why RV mfg should not wire the gas/elect fridge through the inverter.  Disconnect from shore power for 24 hours and your batteries are toast unless you "always" remember to switch the fridge to gas only.   Some people absolutely will not travel with the propane on.  Having the fridge run through the inverter solves that issue.  In 40 years of traveling with RV's with propane and gas/elect fridge we have never turned off the propane while traveling.  (Well when on a ferry or some long tunnels when required to have the propane off)

Note: If you will be dry camping or boondocking for more that 1-2 days between connecting to shore power, you really need a battery monitor such as a Trimetric: http://www.bogartengineering.com/products/trimetrics/

BTW, did you recently buy this RV?

Hope this helps.

Al & Sharon
2006 Winnebago Sightseer 29R
2009 Chevy Colorado 4X4

http://downtheroadaroundthebend.blogspot.com/

AStravelers

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Re: I have 4 solar panels on the roof
« Reply #19 on: October 30, 2017, 06:49:24 PM »
40"x21" each or so, thin flexible panels. No brand name that I can see. No Trimetic. Currently plugged into 15 amp shore power coming out of pole barn. 4 6v interstate deep cycle batteries. Panel from Newmar shows float charge, 13.6 volt D.C. I don't know if there's a question in here somewhere, thoughts on what I'm seeing?
Sun coming overhead soon, should I unplug from shore power and see what display panel says?
Thanks all.
Jeff
With solar panels sized 40"x21" you probably have 80watts per panel, maybe as much as 100watts. 

320watts to 400watts of solar will keep your batteries pretty well charged as long as your dry camping requirement are not very high.  With 400AH of battery I would prefer 600watts or more. 

However if your fridge is running off the inverter for a 2-3 days of cloudy weather the panels won't keep up with the power draw.
Al & Sharon
2006 Winnebago Sightseer 29R
2009 Chevy Colorado 4X4

http://downtheroadaroundthebend.blogspot.com/

Alpena Jeff

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Re: I have 4 solar panels on the roof
« Reply #20 on: October 30, 2017, 07:51:38 PM »
Al.
We brought her home 10 days ago.
I'd like to have 2 more batteries but not sure where to put them. Can they go in the next bay over?
I've read here to size your battery bank and solar evenly. It came to us pretty close to even.
This is our first rv in over 40 years and that was a pop up. Fortunately I read this forum a lot.
A Trimetic 2030 is in my future. Are they difficult to install?
Not sure want type of travelers we will be. Too soon...guessing 2-3 days per week off grid then campgrounds. This will be our home when we start the snowbird thing.
Thanks to you Al and all others for helping!

P.s. Bill Waugh has offered his help by phone. I hope to call him tomorrow. Maybe we just need to talk this out!
Jeff & Judy
2016 Newmar Ventana 3427
Cummings ISBXT turbo 6.7L 360HP
Allison 3000MH
2018 Canyon All Terrain toad
"Official" snowbird!
Retired to "the lake" in north Michigan
Preachers kid since day one!

Memtb

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Re: I have 4 solar panels on the roof
« Reply #21 on: November 01, 2017, 03:17:27 PM »
Thank you for this post. I am about to move into my 2016 5th wheel that is wired for solar.  A bit down the road I plan on getting solar installed once life settles down a bit, get 5th wheel hitch installed in bed of pick up, get 5th wheel parked end of this month at RV resort I just put deposit down.   

     Jenny, If you plan on using multiple panels then in all likelihood your pre-wired system is “inadequate” for a system of any size. “Typicaly” they are “pre-wired” for a panel of 50 watts or so.....which is only to maintain your batteries when the unit is “not” in use.  Wire size (quite large wire) is critical for proper performance. The larger wire gives “less” voltage drop from the panels to the controller. As the panels only produce a relatively small amount of power... you want to “maximize” their performance!
Todd and Marianne
Miniature Schnauzers - Sundai, Nellie and Maggie Mae
2007 Dodge Ram 3500,  6.7 Ram 6 speed manual, 4x4
2004 Teton Grand Freedom
2007 Bigfoot Class C

Memtb

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Re: I have 4 solar panels on the roof
« Reply #22 on: November 01, 2017, 03:26:14 PM »
Al.
We brought her home 10 days ago.
I'd like to have 2 more batteries but not sure where to put them. Can they go in the next bay over?
I've read here to size your battery bank and solar evenly. It came to us pretty close to even.
This is our first rv in over 40 years and that was a pop up. Fortunately I read this forum a lot.
A Trimetic 2030 is in my future. Are they difficult to install?
Not sure want type of travelers we will be. Too soon...guessing 2-3 days per week off grid then campgrounds. This will be our home when we start the snowbird thing.
Thanks to you Al and all others for helping!


   Jeff, take a look at jackdanmayer.com! Their website can tell you more than you probably want to know about RV solar systems. A wealth of great, practical, easy to understand information!
P.s. Bill Waugh has offered his help by phone. I hope to call him tomorrow. Maybe we just need to talk this out!
Todd and Marianne
Miniature Schnauzers - Sundai, Nellie and Maggie Mae
2007 Dodge Ram 3500,  6.7 Ram 6 speed manual, 4x4
2004 Teton Grand Freedom
2007 Bigfoot Class C

AStravelers

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Re: I have 4 solar panels on the roof
« Reply #23 on: November 03, 2017, 09:31:49 AM »
Al.
We brought her home 10 days ago.
I'd like to have 2 more batteries but not sure where to put them. Can they go in the next bay over?
I've read here to size your battery bank and solar evenly. It came to us pretty close to even.
This is our first rv in over 40 years and that was a pop up. Fortunately I read this forum a lot.
A Trimetic 2030 is in my future. Are they difficult to install?
Not sure want type of travelers we will be. Too soon...guessing 2-3 days per week off grid then campgrounds. This will be our home when we start the snowbird thing.
Thanks to you Al and all others for helping!

P.s. Bill Waugh has offered his help by phone. I hope to call him tomorrow. Maybe we just need to talk this out!
Adding 2 more batteries, one bay over means you will have a long cable run, 2-4 feet, to the new batteries while the original 4 have short cables.  That is not the best setup.  While it could work, it is not recommended. 

Before starting the process of installing 2 more batteries, you need to do an energy audit.  Find out just how many AH's you are using from your batteries.  An excellent way to do this is to install a battery monitor. 

To install the Trimetric you mount a shunt near the battery bank, 10-12 inches from the negative post the ground cables go to.  You will need to buy a short cable to go from the shunt to the negative battery post.  Go to Amazon and search for "RV battery cables".  You want a short 12-18 inch cable the same wire size as what is on the battery now.  There should be numbers on the existing cables showing the wire size.

Then any cables going from the RV to the negative battery post gets moved to the RV side of the shunt.  Next you run a small 4 wire cable (about the size of house telephone cable) from the Trimetric to the shunt.  Running this cable is sometimes the hardest part of the install. You want to mount the monitor inside the RV, in a place you can easily view it.  I like to install the monitor high on the wall above the entrance door or somewhere in the living area.  Go here for more details about the install:  http://www.bogartengineering.com/products/trimetrics/

Actually it is better to have more solar watts than AH of batteries. I would prefer 25% to 50% more solar than AH.  For 400AH of battery 500-600watts is better. You can never have too much solar. 

You mention that you only plan on 2-3 days dry camping before connecting to shore power.  Your setup should handle that quite well.  It is important to use a battery monitor to track the AH's used.  If solar isn't keeping up, run the generator for an hour or two in the morning get get a big chunk of the AH's put back in the batteries and then let the solar take over to top off the batteries. 

No need to get the batteries above 90% since you will be connected to shore power every 2-3 days to get the batteries to 100%.

If, in the future, you find you want to dry camp/boondock for 5-14 days, you need to revisit your setup and increase your solar and maybe batteries.
Al & Sharon
2006 Winnebago Sightseer 29R
2009 Chevy Colorado 4X4

http://downtheroadaroundthebend.blogspot.com/

Alpena Jeff

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Re: I have 4 solar panels on the roof
« Reply #24 on: November 08, 2017, 09:47:49 AM »
While unplugged yesterday for 16 hours I hit the batteries with my multimeter. They showed:
6.28, 6.27, 6.28, 6.27. Nothing running in coach for those 16 hours. By Gary's chart in the library I am somewhat short of full. I have been charging all night via shore power and my built in display shows full charge.
Should I equalize?
New to me coach so don't know when if ever this was done.
The batteries (4) are Interstate extremes amp hours each are 232.
It's a 2016 model year so assume batteries are original.
Direction please. I'll be putting the coach in storage plugged in around Dec 1 for 3 months.
Thx, Jeff
Jeff & Judy
2016 Newmar Ventana 3427
Cummings ISBXT turbo 6.7L 360HP
Allison 3000MH
2018 Canyon All Terrain toad
"Official" snowbird!
Retired to "the lake" in north Michigan
Preachers kid since day one!

Paul & Ann

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    • Paul and Ann's Great RV Adventure
Re: I have 4 solar panels on the roof
« Reply #25 on: November 08, 2017, 10:08:11 AM »
Here is some information about your Interstate batteries:

Note the 15.3 volt absorption charge rate.

« Last Edit: November 08, 2017, 10:11:36 AM by Paul & Ann »
Paul & Ann  Iowa
2005 Winnebago Voyage 38J
http://stoughrvadventure.blogspot.com/

kdbgoat

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Re: I have 4 solar panels on the roof
« Reply #26 on: November 08, 2017, 10:20:21 AM »
Good reading here:

https://handybobsolar.wordpress.com/the-rv-battery-charging-puzzle-2/

Using the information Paul provided, along with the principals discussed in the link above, you need to make sure your charging system is delivering what is required by your battery bank to achieve a full charge. The link above has a lot to do with solar, but the charging principals are the same no matter what the charging source is.
I know you believe you understand what you think I said,
But I am not sure you realize what you heard is not what I meant


2016 Leprechaun 319DS

Alpena Jeff

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Re: I have 4 solar panels on the roof
« Reply #27 on: November 09, 2017, 03:26:33 PM »
Here is some information about your Interstate batteries:

Note the 15.3 volt absorption charge rate.
Ok so you're saying I need to adjust my charge values? What I know is my bulk charge is 15.1 volt. I am currently running down my batteries to see what the absortuion charge is once I plug back in.
This is so hard to do for me. My level of understanding is low. I might need to call someone local to walk me thru it.
I now pretty much what I need just don't understand what I need to get there.
This coach is perfect for us. We have spent multiple nights in it. I have a need to understand the workings beyond just pushing buttons!
Thx, Jeff
Jeff & Judy
2016 Newmar Ventana 3427
Cummings ISBXT turbo 6.7L 360HP
Allison 3000MH
2018 Canyon All Terrain toad
"Official" snowbird!
Retired to "the lake" in north Michigan
Preachers kid since day one!

Paul & Ann

  • ---
  • Posts: 1432
    • Paul and Ann's Great RV Adventure
Re: I have 4 solar panels on the roof
« Reply #28 on: November 09, 2017, 03:44:48 PM »
Looks like bulk charge rate should be 14.4 volts.  Absorption charge at 15.3 volts, and float at 13.4.  I am not sure how many of those parameters who can adjust on your charger.
Paul & Ann  Iowa
2005 Winnebago Voyage 38J
http://stoughrvadventure.blogspot.com/

ArdraF

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Re: I have 4 solar panels on the roof
« Reply #29 on: November 09, 2017, 04:29:51 PM »
Quote
I am currently running down my batteries to see what the absorption charge is once I plug back in.

You don't need to discharge them very much, certainly not below 50 percent.  Letting them go too low lessens their life.  That's why we use trickle charging to keep them up.

ArdraF
ArdraF
:D :D

 

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