question

brice-p avatar image
brice-p asked

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 ?

unexplained-grid-draw.jpeg


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 ?

unexplained-grid-draw-2.jpeg


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 ?

battery-capped-unexplained-grid-draw.jpeg




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


ESS3 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)
2 |3000
Toggle Comment visibility. Current Visibility: Viewable by all users

Up to 8 attachments (including images) can be used with a maximum of 190.8 MiB each and 286.6 MiB total.

1 Answer
netrange avatar image
netrange answered ·

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

2 |3000
Toggle Comment visibility. Current Visibility: Viewable by all users

Up to 8 attachments (including images) can be used with a maximum of 190.8 MiB each and 286.6 MiB total.