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Old 07-04-2012, 07:07 AM   #1
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Hello boondockers, need help wiring an either/or switch

First hello people, new to RV solar here and excited. I'm attempting to be a weekend boondocker. I have a 2013 Rockwood Ultralite 2501SS (my second TT). I read Handy Bob's blog and John Mayer's information and so much other stuff (quite a bit in this forum) I can't remember it all. To get my feet wet I have a Morningstar SS MPPT 15L with RTS (remote temp sensor) and MSC (PC Meterbus Adapter) on the way. I believe I have most of my solar system figured out with one exception. Just talked to Morningstar and absolutely positively not allowed to run charge voltage from the WFCO 8955 backwards through the SS MPPT. My brain is mush right now so maybe I have read about this but I could swear I have not seen any wiring configurations where I can have my solar power the RV and charge the battery, then have the WFCO power the RV and charge the battery. I'm thinking some kind of either/or switch with a by pass diode (can you say end around carry?). Maybe it's not that complicated.


Thanks, Jeff
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Old 07-04-2012, 11:17 AM   #2
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No need to worry about the converter, it is just wired in parallel with the solar charger. If you have a shunt, just make sure your converter is wired to the load side of the shunt, so that charging current is measured.
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Old 07-05-2012, 09:17 AM   #3
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Quote:
Originally Posted by John Hilley View Post
No need to worry about the converter, it is just wired in parallel with the solar charger. If you have a shunt, just make sure your converter is wired to the load side of the shunt, so that charging current is measured.
Thanks for replying John but I'm not worried about the converter I'm worried about the controller and there is no shunt in this system. I guess another way of coming at this is to ask why are there separate negative terminals for battery and load? Do they need to be isolated for monitoring? What would happen if they were connected to each other and then to battery negative.

Thanks, Jeff
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Old 07-05-2012, 03:15 PM   #4
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You have two charging devices. You connect them in parallel to the battery. positive from charge controller and positive from WFCO8955 converter both connect to the positive terminal of the battery. The negative from both can be connected to a common ground on the chassis and then to the battery. If you do get a shunt to measure current in and out of the battery, it would go between the common ground on the chassis and the negative battery terminal.
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Old 07-09-2012, 11:14 AM   #5
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I wasn't sure where to start this thread and since I learned a bunch here in the boondocking forum I posted here. I also saw the systems forum so posted there and we got it figured out over there. Here's the thread.

Hello and need help on Solar Controller/RV Converter ether/or switch
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