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lemonjelly avatar image
lemonjelly asked

MPPT 100/50 Off state: #OR1: Insufficient PV power

My system was working fine until 3 days ago the solar stopped charging the 2 x Victron 150Ah Lithium Smart Battery, I have 3 x Midsummer Energy 150W Flexible Panel.


I didn't turn the system off, although in the past I have turned the battery isolator off without diabling the MPPT via the app.

Here are the readings from the app:

1.jpg

2.jpg

3.jpg

4.jpg

I believe I need to check the voltage and current at the MPPT positive screw with a multimeter, then check the cables when removed from the MPPT? But currently I am on the road and was wondering if anyone could infer anything from the above images please? TIA.

MPPT SmartSolarSolar Panelsmart solar charging behaviour
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2.jpg (106.6 KiB)
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4.jpg (79.9 KiB)
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Alexandra avatar image
Alexandra answered ·

@lemonjelly

The vmax of your panel is too low to start charging. It needs to be at least 5v above battery voltage. See the last two pictures close to 12-13v, in the previous hovering around 70v.

So either the panel, or the connections to the panel are not good.

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lemonjelly avatar image lemonjelly commented ·

Thanks Alexandra, I see 3 days ago the V max was 23.46 V, and I don't think the batteries were 100% charged then, so should it not have started charging? Would it be expected for the v Max to drop from 70 to 23 to 16 to 12 with panel/connection problems?


We've had 3 days of great sunshine and hot temperatures, similar or even better than the proceeding 4 days, so that would suggest also that it is a panel or connection problem? I can't see any issues with connections so possibly a panel has failed, although they are only around 2.5 years old.

Edit to add, I just realised you might mean connections between the cells?

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