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Charging batteries from Grid


Brian Chetty
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I have 1 x 4.8kwh 100amp h battery ..it was fully charged by solar.

Bulkcharge voltage set to 56.4v

Floating charge voltage set to 54v

Low DC cut off voltage set to 42v

Overload bypass is enabled. 

I was expecting it to use battery solar and first..

But I realised that it's set to go to line mode if the overload in battery is detected.  But just wondering is the battery can deliver 5kva for at lease a short while before inverter switches to grid?

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20 hours ago, Brian Chetty said:

But just wondering is the battery can deliver 5kva for at lease a short while before inverter switches to grid?

Ordinary lead acid batteries don't like heavy discharges; 5 kW would be over 100 A, so over 5C for a 100 Ah battery. This will not be good for long life.

They would probably provide that power for a few minutes, at the expense of battery life, if the inverter allowed it to (e.g. if there was no AC-in). But likely the battery voltage would sag so much that the inverter-charger (especially without the KettleKomp™ feature of patched firmware) would immediately switch to grid.

200 Ah (of nominally 48 V) is the minimum recommended size for a 5 kVA (especially a 5 kW) inverter.

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