question

Ashley Reid avatar image
Ashley Reid asked

Why is my ESS so inefficient? 7.7kwh drawn from grid when lots of sun

My grid point is set at 30W. Why did I still draw so much energy from the grid yesterday, there was clearly enough sun and battery capacity (14kwh). 1.5kw on AC inverter and 5.kw on Smart250. Is there something going wrong here?

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ESSess effizienz
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1 Answer
Ashley Reid avatar image
Ashley Reid answered ·

maybe its just undershoot/overshoot problem. here is the same of the 3 phases exported from VRM for a time period. I don't know if this means the grid point is then at these values for that minute on average or if its just and instantaneous value


2023-03-28 11:05:17 -1024
3/28/2023 11:06 60
2023-03-28 11:07:17 -1134
2023-03-28 11:07:24 -996
2023-03-28 11:07:42 -873
2023-03-28 11:08:18 -1036
2023-03-28 11:09:17 -889
2023-03-28 11:10:17 72
2023-03-28 11:11:17 0
2023-03-28 11:12:17 -10
2023-03-28 11:13:16 566
2023-03-28 11:13:17 450
2023-03-28 11:14:18 -23
2023-03-28 11:15:17 -140
2023-03-28 11:16:17 129
2023-03-28 11:17:17 346
2023-03-28 11:18:17 126
2023-03-28 11:19:17 32
2023-03-28 11:20:17 78
2023-03-28 11:21:18 124
2023-03-28 11:22:17 128
2023-03-28 11:23:17 23
2023-03-28 11:24:17 78
1 comment
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Ashley Reid avatar image Ashley Reid commented ·
Now I think it might just be the definition. To grid might be the sum of all the power going out, i.e. when you see a negative on a single phase. It might not be the amount when the total of the 3 phases is negative for some amount of time.


So I need to check the grid meeting to see what that reflects. I.e. when I see 4kwh to grid and 5kw to grid, the grid meeter reads 1kw as hoped.

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