Cant Wait said:
I've been reading lots of posts on what people are doing i.e. surge protectors, autotransformers, cheater boxes etc. It seems that for every yes there is a no on the use of these items. I know that the surge guard is a MUST. My issue is that where we camp most the hook-up is 30amp. With the AC set-up my unit (2012 Journey 40U) has, zone 1 has 2 AC's running, and zone 2 has the bedroom AC with no other options. With the AC set on zone 1 the draw is 26amps, this leave very little for anything else. Is there a way to cut-out the 2nd AC on zone 1 setting? From what I've read the cheater boxes that let you hook into both the 30 & 20amp at the pole to get 50amp don't really work in that the GFI 20 amp breaker keeps tripping. Has anyone used the JTB Power Solutions system that does (according to them) combine the 30 & 20 amp without tripping the 20amp GFI all the time for use with 50amp systems?
I know this is an old thread, but since nobody replied to "Cant Wait's" main question, I figure I'd join and chime in since I have done what he was asking:
Here's a link to the slideshow of my JTB and PI EMS systems:
http://s544.photobucket.com/user/knowles2424/slideshow/JTB
Here's is my JTB Power Solution System installed in my Denali 266RL 34' TT. I also have a Progressive Industries EMS on both the 50AMP Main Panel service and the 30AMP (Technically 20AMP) JTB service. I did not opt for the JTB install kit as I intended to use a 30 amp twist lock power inlet to match my 50 amp main inlet. Also I was running short #10 wires (as you'll see in the pictures, my JTB is mounted inside right next to my main panel), so the install kit is not pictured. I also purchased the yellow 30to20 amp adapter by Marinco (#126A) for adapting the 30A cord to the 20 amp GFI receptacle. I have since also purchased the Conntek 30 to 20a pigtail because at the last site, the 30a and 20a plug were practically touching and it was an awkward and very tight fit. Also the 20a receptacle is "upside down" which makes the 30amp plug face upwards and it was a tight fit to bend it under the metal box lid.
I have a 50AMP TT, but I wanted to be able to incorporate the 20a GFCI receptacle at parks (without tripping the GFI) or use both the 50 and 30 amp connections and this is the only safe way I found. I wanted to run both AC's and a microwave and not worry if the ice machine kicked on too. To me, it was well worth the money and time to install this setup. The JTB automatically "removes" the main A/C from my main panel when the JTB is plugged in so it doesn't count towards my main panel amperage draw. When the JTB is not plugged in, the main A/C is still part of the main panel. It's a "smart" set of automatic relays that won't trip the GFI. It does not trip the GFI because it shuts off the power from the main panel before switching over the 20amp leg power input. The relays let you know when they are switching, thump...thump!
I also chose to add a receptacle to my JTB box which I will use only when the main A/C is turned off at the thermostat. I chose to "JTB" my main A/C rather than my second A/C because that is the ducted unit that we will always be using. It also is the larger unit and pulls more amps, so I isolated it to the JTB which frees up more available amps on the main 50 amp panel for the microwave, uline ice maker, hair dryer, and other appliances. If I did the bedroom AC on the JTB then I am limiting the amount of time that I actually benefit from the JTB and I could still only pull 30 or 50 amps on my main line. Doesn't make sense for the MFG of the JTB to be recommending the second AC be isolated. They need to rethink that advice.
The JTB is a fancy auto-transfer switch. I don't mean that in a negative sense, but it does not truly provide 70 amps to a 50 amp coach or 50 amps to a 30 amp coach. That is slightly inaccurate. It does remove one breaker of your choice from the main panel. In my case my main AC will pull as high as 16 amps (reading on PI EMS), so in my case it frees up 16 amps for other use on my main panel. In my case it makes my 50amp TT capable of 66amps max. The other "unused" 4 amps are not added to the 50 amp main panel. I hope that makes sense... it did in my head.
Overall, I love the JTB. I think I enjoyed the wiring and "project" aspect of it as much or more as I do the actual benefit it provides. Sometimes I think the main reason I go camping is just to test out my new mods and come up with new mods to do when I get home.
Also, I ordered straight from the MFG by calling the #. Had to leave a message as they never answered for days, but then when I left a message they called back immediately.
Hope the pictures and my opinion help if you're still considering getting one.