First build problem

First build , going on 3 years no problem, now I have LOW PV output in direct sun>battery goin down daily>
Original build pic is included, it worked fine for long time

now I get 12.7 volts no load direct sun as indicated on my MT50.

Im scratching my head now my solar panel is clean and looks ok to me.

why is MPPT (-) lead attached to B-? The only thing that should be attached to B- is the battery main (-).

In this config, the shunt can't see the incoming current, so it will always reflect incorrect SoC.

All loads and sources should be at P-.

This isn't your problem, but it's an issue.

Sounds to me like your MPPT has failed.

I can't read the solar side volts clearly on the mt50. What is it showing for panel voltage?

waylotul said:

now I have LOW PV output in direct sun>battery

Click to expand...

What panels and what configuration is your array?

waylotul said:

now I get 12.7 volts no load direct sun as indicated on my MT50.

Click to expand...

Have you measured this with a meter?