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jm0278 asked

Using Grid Setpoint to Force Charging?

I have a Mulitiplus-II, Cerbo GX running ESS, and some solar. I also run my own control program on a separate computer that communicates with the Cerbo's ESS and can programmatically change parameters based on state-of-charge and time-of-day.

I want my batteries to have a minimum state-of-charge before the grid's peak power rate starts. If I don't get enough solar power to recharge to the minimum before the peak rate starts, are there any issues with raising the Grid Setpoint value to force charging from the grid by setting it higher than the AC load? I just ran a simple test and confirmed I can force charging, but I want to check to see there's a better way or any potential negative consequences to doing so.

Thanks!

Multiplus-IIESS
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marcve avatar image marcve commented ·

@jm0278. Quote: I want my batteries to have a minimum state-of-charge before the grid's peak power rate starts ? Don't you mean, you want them charged before the power gets cexpensive, so you can run your loads of battery during peak hours.

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marcve answered ·

I approach your setting in a different way. Always keep my batteries charged. During "expensive" feed, I only take max of 1 amp ( minimal from grid ) from the grid, the rest from solar. During "cheap" hours, I open the AC input, but it will still use the PV available to charge the batteries before it is using the grid.

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jameswest answered ·

Wouldn't you be better off changing the ESS mode to 'keep batteries charged' when your SoC and time conditions are met?

I think someone previously posted a feature request to have this functionality added to a scheduled charge. At the moment scheduled charge will achieve what you want but it continues to power from the grid even when SoC is reached.

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