It doesn’t make any sense that the controllers would be processing 2800 watts internally.
It would be so hot you couldn’t touch them. Think of a 1500 watt electric heater and this would be 2X. I would put my clamp on to confirm. But I suspect it’s going somewhere Jay > On Sep 7, 2024, at 4:50 PM, Dana Orzel via RE-wrenches > <re-wrenches@lists.re-wrenches.org> wrote: > > OK, you wise guys. > I am upgrading my home off grid system from two FM 80s to two FM 100s. > The FM 80s were able to share the negative wire so you didn’t have to pull a > second negative wire. > I wired the FM 100 typical of how my FM 80s were wired with a number four > battery negative assuming and yes, I know what happens when I assume, that > the PV negative on the battery negative are common and I could just pull one > number four since going through those double 1” - 90° is a bitch. Currently I > have two # fours for output to battery, the number eight ground and 1 # six > PV input. > I got this all together and it’s charging just fine but once the battery got > full charge controllers continued to produce full output. The battery dropped > to a float and I had 2800W on each charge controller continuing to be > produced at which was turning into heat so the FM 100s were getting very > warm. The fans had not turned on, but the heat sinks were definitely very > very warm to the touch. The battery voltage is fine. > I Read the manual it doesn’t talk about being able to use one negative so I > am assuming that my problem is that the PV needs a negative and they do not > share the negative. > Has anybody else seen this or done the same wiring maneuver. > thanks in advance > > Dana Orzel - d...@solarwork.com - 208.721.7003 > _______________________________________________ > List sponsored by Redwood Alliance > > Pay optional member dues here: http://re-wrenches.org > > 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 > > There are two list archives for searching. When one doesn't work, try the > other: > https://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/ > http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org > > List rules & etiquette: > http://www.re-wrenches.org/etiquette.htm > > Check out or update participant bios: > http://www.members.re-wrenches.org > _______________________________________________ List sponsored by Redwood Alliance Pay optional member dues here: http://re-wrenches.org 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 There are two list archives for searching. When one doesn't work, try the other: https://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/ http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org List rules & etiquette: http://www.re-wrenches.org/etiquette.htm Check out or update participant bios: http://www.members.re-wrenches.org