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Author Topic: Help need choosing an Inverter  (Read 8747 times)

Gary RV_Wizard

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Re: Help need choosing an Inverter
« Reply #30 on: October 06, 2015, 10:29:18 AM »
Quote
I really don't understand the recharging part of this discussion.

A battery is just a storage tank for electrical power. You take power from the battery(s) to operate the inverter, so the "tank" will eventually empty and the inverter stops working. Since an inverter uses a lot of 12v power, that "eventually" is usually sooner rather than later.

The recharging business is about putting more power back into the batteries for future use.  If you use half the power in the battery "tank", you need to put that back for the next time you want it.  If it was a water tank, you could probably do the gallons arithmetic easily enough, but few people are used to counting their electricity usage except by the size of the bill each month.
Gary
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Gary Brinck
Summers: Black Mountain, NC
Home: Ocala National Forest, FL

JiminDenver

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Re: Help need choosing an Inverter
« Reply #31 on: October 06, 2015, 11:06:00 AM »
Batteries like to be recharged as soon as possible, the longer they wait the more unhappy they get. Even though a coffee maker or microwave only runs a short time, they use a lot of power doing so. Keeping the truck running while you do it and leaving it running after will help but you really need a good charge to maintain the health of the battery.

Jeff

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Re: Help need choosing an Inverter
« Reply #32 on: October 06, 2015, 11:59:00 AM »
Electrics just turns my mind  into a bowl of jelly.  I really don't understand the recharging part of this discussion.

We are looking at an inverter when we boondock..mainly at wally mart etc..  to run my cpap (however, the coffee maker and laptop sound good as well).  We have 2 6 volt (I think in the 5er) and we never disconnect from the TV which has 2 12 V batteries.

I thought we would would have to wire it in from the RV battery but it would be great just to plug the the cpap into an existing plug..

I am going too need help on this one...

Thanks..


I have run CPAPs for 11 years in 3 different motorhomes and would offer the following observations.


1. I have used Resmed and Respironics units on MSW inverters without any problems.


2. Some models have 12 volt capability that removes the necessity of an inverter but my Remstar powered the pump only on 12 volt, not the heater in the humidifier.


3. Powering the CPAP with an inverter that runs major circuits in the RV will consume much more power overnight than a smaller dedicated inverter running only the CPAP. Our Xantrex normally shows a 10-15 amp draw because of overhead and all the various appliances and wall warts plugged into it and that is before turning anything like the CPAP on.


4. It is really quite simple to install a small 500-600 Watt automotive inverter near the batteries (Not in the same compartment) and then run coax to the location you need power for your CPAP. I have installed a separate outlet for the inverter power and if I unplug the CPAP in the AM the inverter shuts down without a remote switch.






 

Jeff

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Re: Help need choosing an Inverter
« Reply #33 on: October 06, 2015, 12:14:23 PM »
I would also add a couple of thoughts to the discussion of inverters. While it is certainly simpler to feed the entire coach through the new inverter there will be times you want a circuit or two that are not fed by inverters.


We burned up the main board of our Xantrex inverter because all outlets inside the coach were wired through the inverter sub panel and when the park lost power one night in a thunderstorm the inverter powered the cube heater we had running when we went to bed. Unfortunately the batteries lasted longer than the inverter.


If you decide to install a separate inverter and leave the current charging system in place the XantrexPro Series  provide 1800 Watts and a 25 amp AC pass-through switch built into the inverter. I use one to power our Samsung refrigerator, the Sat receiver and my CPAP and it automatically switches to shore or generator power when available.
« Last Edit: October 06, 2015, 12:43:29 PM by Jeff »

grassy

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Re: Help need choosing an Inverter
« Reply #34 on: October 09, 2015, 07:06:35 AM »
OK...been doing a bit of research.

I can buy a battery pack for this ..really expensive in my mind and I have never had much luck with batteries so I don't see this in my future.

I am perplexed on how to figure out if I need a pure sine wave...

What I own is a "Philips Respironics System One Auto A Flex with Heated Tube Humidifier" .

The electrical Requirements are 100 - 240 VAC, 50/60 Hz, 12volt DC ..but that doesn't really tell me what the draw is.

If we buy an inverted to run this, can we run a radio and / a coffee maker ?

Thanks...I am lost in the woods with this one...
2001 Freightliner FL60 Sport Chassis, 3126b, Jake, Air... Brakes, Cab & Rear Suspension, Ultra Shift
2010 Northwood Arctic Fox 29-5T (Silver Fox Edition)

Alfa38User

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Re: Help need choosing an Inverter
« Reply #35 on: October 09, 2015, 09:52:21 AM »
OK...been doing a bit of research.

I can buy a battery pack for this ..really expensive in my mind and I have never had much luck with batteries so I don't see this in my future.

I am perplexed on how to figure out if I need a pure sine wave...

What I own is a "Philips Respironics System One Auto A Flex with Heated Tube Humidifier" .
The electrical Requirements are 100 - 240 VAC, 50/60 Hz, 12volt DC ..but that doesn't really tell me what the draw is.

If we buy an inverted to run this, can we run a radio and / a coffee maker ?

Thanks...I am lost in the woods with this one...

I found this here, if it helps (and if I picked the correct model!!):
http://www.cpapsupplyusa.com/pdfs/Philips%20Respironics%20REMstar%20Auto%20User%20Manual.pdf

Electrical
AC Power Consumption: 100 – 240 VAC, 50/60 Hz, 2.1 A
DC Power Consumption: 12 VDC, 5.0 A
Fuses: There are no user-replaceable fuses.
« Last Edit: October 09, 2015, 10:08:26 AM by Alfa38User »
Stu
Montréal, Canada 🍁
Snowbird, Naples Florida
Alfa Gold 38 (2000) 5ver (parked!)

"Of course I talk to myself, sometimes I need expert advise!!!"

grassy

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Re: Help need choosing an Inverter
« Reply #36 on: October 09, 2015, 10:02:38 AM »
Thanks..so a 300 watt would be dandy ?  And would that be with my humidifier ?  Sorry, total dweeb with this..

Thanks

PS - thanks for the manual !!!
2001 Freightliner FL60 Sport Chassis, 3126b, Jake, Air... Brakes, Cab & Rear Suspension, Ultra Shift
2010 Northwood Arctic Fox 29-5T (Silver Fox Edition)

Jeff

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Re: Help need choosing an Inverter
« Reply #37 on: October 09, 2015, 09:11:10 PM »
Grassy


Inverters are not 100% efficient so I would suggest 500-600 watts for the CPAP. A coffee maker will probably use closer to 1200 watts (Check your appliance's rating), the radio will probably run on 100-200 watts but again check the requirements.

grassy

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Re: Help need choosing an Inverter
« Reply #38 on: October 10, 2015, 06:56:48 AM »
Grassy


Inverters are not 100% efficient so I would suggest 500-600 watts for the CPAP. A coffee maker will probably use closer to 1200 watts (Check your appliance's rating), the radio will probably run on 100-200 watts but again check the requirements.

Thanks..I can now start shopping.

grassy
2001 Freightliner FL60 Sport Chassis, 3126b, Jake, Air... Brakes, Cab & Rear Suspension, Ultra Shift
2010 Northwood Arctic Fox 29-5T (Silver Fox Edition)

grassy

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Re: Help need choosing an Inverter
« Reply #39 on: December 23, 2015, 02:19:46 PM »
I am not sure if this is relevant for other cpap users but I will pass it on. Many may already know this but it is new to me :)

I was in the supply company that sold me my machine and I asked them about what size / type inverter I need to buy for my trailer.  Apparently, mine cpap machine does not need one.  As an option, I can buy a unit or adapter for  23 $s.. that will allow me to plug my machine into a cigarette lighter socket or hook directly on to a battery...so, all I need to do is have my son, the electrician,  do a little modification and give me a plug beside the bed.

With the 2 deep cycle 6 volt batteries in the rig and the 2 massive 12 volt in my tv, I think I am good to go when we are boondocking on the road..

grassy
2001 Freightliner FL60 Sport Chassis, 3126b, Jake, Air... Brakes, Cab & Rear Suspension, Ultra Shift
2010 Northwood Arctic Fox 29-5T (Silver Fox Edition)

 

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