MPPT75//10 switch Input between solar and 48v Battery

Q&A and troubleshooting
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1

Hi,
I have a MPPT 75/10 Blue Solar which charges a 12V Battery. So far so good. Now I want to feed the BluSolar alternatively by a 48V Battery when there is no Sun. The 48v and 12 V have the same Ground. Is it a Problem when solar Input- and battery output- are the same?
Thanks
Ed

2

Yes, it is a problem, tmk the current measurement for the mppt function is measured through the negative input. If this is connected to the battery minus it won’t work any more.

3

I think your better off with a dc to dc converter/charger

1 Like
4

Do not do this; this is unsupported and is likely to cause damage to the controller itself and/or the surrounding system. The solar controller PV input is for PV panels only.