MPPT 100/20 grounding the loads

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dmeikle asked Nov 17, '18

MPPT 100/20 grounding the loads

I am in the process of wiring up my 100/20 mppt controller to a deep cycle battery, 3 x 80watt PV wired in series and a fuse box which will power my accessories including a fridge. I presume I’m correct in thinking that my battery will charge my accessories through the controller when the solar is insufficient? Also do I need to send the ground wire back to the controller from the fuse box or can I ground directly back to the battery? Thank you

MPPT Controllers Grounding

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Answer 1 · 2018-11-30T19:03:05Z

Margreet Leeftink (Victron Energy Staff) answered · Nov 30, 2018 at 07:03 PM

Hello,

Yes your presumptions are correct. Your accessories will be fed by solar power during the day. This will be complimented by battery power during cloudy weather or completely by battery power during night.

The ground wire from the accessories should be connected to the MPPT controllers load output negative.

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Answer 2 · 2019-02-07T11:48:17Z

joeoffgrid answered · Feb 07, 2019 at 11:48 AM

All negative terminals on my blue solars are same potential. So why not use a common minus?

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