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nuxland asked

3 phase multi negative grid setpoint

Can someone explain when there is inhouse load on phase 3 why other two multis do not generate more power to get to -8kw grid setpoint. Here is image how my -8000W GridSetpoint is when using oven on Phase 31668091603740.png

And here the same -8000W gridsetpoint when oven turned off.

1668091633997.png

3 phase
1668091603740.png (76.9 KiB)
1668091633997.png (75.9 KiB)
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Matthias Lange - DE avatar image Matthias Lange - DE ♦ commented ·
What components do you have? MultiPlus? Quattro? Batteries?
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2 Answers
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hominidae answered ·
..best guess is, that battery (BMS) or 3ph-Multi does not allow for a discharge rate higher than these combined 210A.
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nuxland answered ·

I have 3 pcs of 5000KV multiplus II units 48V.

There is no BMS involved I can discharge and charge at 250A if needed.

It seems that L1 and L2 multis just inverted at 2,6kw but they should have ramped up to at least 3,6kw


Yeah you are right 70A per multi, but I have seen 4kw per multi.

But it does not add up. 70A x 51V = 3570W, then lets take 10% for conversion it is 3213W and then substract the load on L1 and we get 2895W. Yeah close but still 200W should have been more on grid meter.


I figured out some time ago that that MULTI in lower of the picture is showing DC voltages and amps but AC wattage :)

50,84v * 212,4A = 10798,416W and wattage is 9031W, so in losses (so heat) is going 1767W :) and that is more than 10%, it is 16% and therefore my 200W in previous section is just that extra 6%.

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Matthias Lange - DE avatar image Matthias Lange - DE ♦ commented ·
70A is the charging current.

The inverter power is 4000W at 25°C.
Your batteries are at 30°C so I guess you ambient temperature is also above 25°C and If the MultiPuls' running at full power for a while they will derate the power output.

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