Mac I have used the sunpower 318 on trailers with the outback charge controller FM-60, which was wired for positive ground. However this was the only power on board, did not have any issues when connected to the truck or via the outback PS 2 except when I connected the laptop to the Mate 3 and had it plugged it to the inverter power, this would pop the GFI, I used an optical interface to prevent this from happening. I will say the Outback is more expensive then the panel so it may not be worth it. Jerry
On Sat, Jan 20, 2018 at 3:43 AM, Mac Lewis <maclew...@gmail.com> wrote: > Hi Wrenches, > > I have a buddy that would like to use a leftover SunPower E20-327-C-AC, > panel on his RV. Obviously he would need to take the inverter off. What > I'm not sure of is if this panel can operate in an ungrounded > configuration, or negative ground or does this still need a positive > ground? If it does need a positive ground, are there any decent MPPT > charge controllers that are fully isolated from PV to battery side, that > would allow PV + ground and Battery - ground? > > Thanks > > -- > > > > Mac Lewis > > *"Yo solo sé que no sé nada." -Sócrates* > > _______________________________________________ > List sponsored by Redwood Alliance > > List Address: RE-wrenches@lists.re-wrenches.org > > Change listserver email address & settings: > http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org > > List-Archive: http://www.mail-archive.com/re-wrenches@lists.re-wrenches. > org/maillist.html > > List rules & etiquette: > www.re-wrenches.org/etiquette.htm > > Check out or update participant bios: > www.members.re-wrenches.org > > >
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