question

xychiux avatar image
xychiux asked

Multiplus 14/1600/40 MPPT 150/75 - Use excessive DC solar to power loads

I've got my system in ESS setup, gridpoint set to ~0 watts (I'm in France I don't have a contract to allow feed back).

If I turn on a load 1400w on the AC-Out it will drain battery and use solar. As I'm with old wet batteries I set the minimum soc to 90% (voltage drops quickly on the old beasts).

Once reaching 90% I'd expect to see the following:
- maximum consumption of solar to be used to:
1. power loads
2. further charge battery
- take power from grid to not drop below 90% Soc.

What is happening instead is that the MPPT goes to absorption / float slowly topping of the battries while the heavy load is 100% powered from grid.

How to keep MPPT in bulk if AC-Out has decent loads?

MPPT ControllersESSmultipus
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1 Answer
kevgermany avatar image
kevgermany answered ·

Try setting the MPII absorption voltage lower than the MPPT. For example MPPT absorption 14.4V, MPII absorption 14.2V

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