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
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