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tatlocks avatar image
tatlocks asked

New unit MPPT 75/10 no output

We have factory installed panels on our NuCamp trailer with an MPPT 75/10 controller. App says 15v 0a. Lifetime output is 0w. Wiring all looks good, but battery dies and 0w obviously means no current is being generated. Ideas?

MPPT Controllers
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4 Answers
dazey77 avatar image
dazey77 answered ·

Is it actually seeing the battery voltage? If its dark and there is no solar input, does it still say 15v?

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tatlocks avatar image tatlocks commented ·

Voltage goes down as it gets dark. Voltage readings for both panels and battery look right and battery is working properly - lights, fans, etc., but battery draw on the app always reads 0a as well.

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rickp avatar image
rickp answered ·

Hello Tatlocks,

It will help to know what voltage you're battery bank is operating on. You can start by checking the open circuit voltage of the panels at the solar charge controller to make sure something is being sent to the SCC. If you have voltage there, and it is higher than your battery bank voltage (for instance, if your battery bank is 24V or higher, 15V at the SCC will not activate it to charge) then you can move to checking the settings on the SCC itself.

Lots of possibilities!

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tatlocks avatar image
tatlocks answered ·

Unit is now wired directly to the battery. Nothi g happening still. Bad controller unit?


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Trina avatar image
Trina answered ·

Also it says "float" so try puttimg a load on via direct on the battery (something not too intense) and also via the direct out on the MPPT when there is sun on your PV's.

Once my small system reaches float is often looks similar if fhe batteries are in float and healthy, the PV amps read 0 too.

IE the PV's are only maintaining the "float"


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Matthias Lange - DE avatar image Matthias Lange - DE ♦ commented ·

@TrinasGarden The Problem is already solved, it was a blown fuse at the MPPT.

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