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dgmar-ni avatar image
dgmar-ni asked

ESS fully charging batteries with solar first?

Hello everyone,

We just installed a system with two Multiplus II 2kW 48VDC and Cerbo GX. The system is configured with ESS and every night the batteries are drained to the lowest SOC so the grid supports automatically. That's fine.

Early next day the MPPT controller begins charging the battery bank, and at the same time powering loads. I am wondering if it could be possible that the solar charger takes batteries at a full charge first, and meanwhile the inverters power loads from grid until the batteries reach 100% SOC. I mention this because batteries are not reaching 100% SOC. There is enough PV power to a full recharge but the power is shared at the same time with the loads. The idea is to charge batteries with solar first, without being discharged since early morning and keep them charged to be used at night.

Thank you in advance for your help.

ESS
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2 Answers
Guy Stewart (Victron Community Manager) avatar image
Guy Stewart (Victron Community Manager) answered ·

The method in the Victron system to make sure that your batteries get a full recharge each day is to use the ESS mode 'Optimised with Battery Life'.

This will adjust the minimum state of charge the battery is discharged too at nights so that the battery gets fully recharged the next day.

It will adapt over time.

Try giving that a go and see if it get you the result you want (even if by a slightly different method).

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seb71 avatar image
seb71 answered ·

There is enough PV power to a full recharge but the power is shared at the same time with the loads.

This is more efficient than to charge the battery and then discharge it to power the loads.


The proper solution is to increase the solar production (more PV panels on the same or on additional MPPT chargers), so that you cover the energy for the daytime loads and the energy to recharge the battery for the night.

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