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aleksejs avatar image
aleksejs asked

ESS is losing power

I do not understand. I have ESS: Multipluss II 3000/48 + MPPT 250/60 + Cerbo.

Having good sun system produces 2400w (long time), but I feel could be better.

After Cerbo restarting, system is producing 2900w (long time).

This situation I saw few times, may be it is every day.

Screenshots are supplied. Sun was permanent.

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ESS
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Alexandra avatar image Alexandra ♦ commented ·

@AleksejS

The voltage is lower on the panels in the first one.

If you don't have an irradiance meter saying the sun is the same is not really a gauge. Sometimes higher moisture in the atmosphere or more dust can affect the irradiance. Sunshine is not as consistent as we think it is.

Either panel temps (which affect voltage) is an issue or there is failing connection or diode as a possibility as well.


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aleksejs avatar image aleksejs Alexandra ♦ commented ·
Sorry, but NO. I saw this situation too often. And every time power goes up after just Cerbo rebooting. Voltage is may be lower because Cerbo is driving the MPPT charger.
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aleksejs answered ·

After some time ESS came back to 2500w and stayed for a long time.

Again, rebooting Cerbo increased produced power to 2900w

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I think Cerbo has some issues driving MPPT charger.


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aleksejs answered ·

And again, another Cerbo restart increase produced power.

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