ESS 1Ph on a 3Ph Grid Connection - Energy flows not stacking up - Phase compensation playing up ?

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brice-p asked Jul 3, '22

ESS 1Ph on a 3Ph Grid Connection - Energy flows not stacking up - Phase compensation playing up ?

Hi everyone,

I commissioned a first ESS system (1xMulti 3kVA on a 3Ph grid connection) a few days ago and cannot make sense of some VRM readings. I am a newbie to it and would appreciate your valuable insights.

For instance at night (see attached) I consume 63W on L1 and 10W on L3 that is 73W total consumption. Battery is discharging at 74W. I can live with the 1W discrepancy.

However, why am I drawing 9W from the grid ?

Another example during the day, early morning, consuming 68W on L1, 10W on L3 and 10W for charging the battery, so 88W in total. I produce 83W with PV so net difference of -5W. Why do I draw 33W from the grid ?

Last example, in the evening, I consume 3234W on L1. Battery is discharging at 2672W. So a net difference of 562W.

Q1: why does the battery not allow more power out ?

Q2: why do I draw 774W from the grid instead of the 562W ?

Thank you very much in advance for your time and consideration,

ESS 3 phase

unexplained-grid-draw.jpeg (290.2 KiB)

unexplained-grid-draw-2.jpeg (302.2 KiB)

battery-capped-unexplained-grid-draw.jpeg (291.5 KiB)

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Answer 1 · 2022-07-03T18:41:41Z

netrange answered · Jul 03, 2022 at 06:41 PM

There are always losses when converting Energy from AC to DC and back ...
The more current flows, the higher the losses.

Actually everything looks good

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