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mfred68 avatar image
mfred68 asked

Optimise with battery life

I have an ess configuration with a Cerbo gx and multiplus ii. I jave set my minimum soc to 20% (I have 42kwh lifepo4 battery bank) and I set it to optimised without battery life.

If I were to set it to optimised with battery life, as I understand it, it will start charging from the grid when it reaches the minimum soc. If this is the case, how much will the grid charge it? I can not find a setting to set a grid charged maximum soc, so I'm guessing it will charge until 100% which I don't want, especially if there's good solar the next day.

ess settings
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2 Answers
Daniël Roux avatar image
Daniël Roux answered ·

That's not what BatteryLife does, no. So long as the SOC remains above the minimum SOC, both with and without BatteryLife enabled the system will try to stick to the grid setpoint.

What BatteryLife will do, is: if on a given day there was not enough solar generation to charge the battery to full, it will raise the "active" SOC limit by 5%. So if for example you have the minimum set to 20%, and you have three cloudy days where the battery does not reach full charge, it will by the end of the third day stop discharging the battery at 35%. And for every day that the battery does reach full, it will drop the minimum SOC by 5% again (though never below the minimum SOC you select).

The aim of this is to compensate for inclement weather to ensure the battery attains a full charge regularly and can thus perform cell balancing regularly (and so that should there be a grid failure, that the battery isn't at an unnecessarily low state of charge).

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mfred68 answered ·

Thanks that was very informative.

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