question

allswell avatar image
allswell asked

Since issues in VRM solar is now completely off line


This is our second full day with zero solar though our panels are bathed in light. I have not touched my wiring. Nothing has changed yet two days ago we were getting great charging from them and now yesterday and today absolutely nothing.


Help?



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MPPT SmartSolarsmart solar charging behaviour
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6 Answers
JohnC avatar image
JohnC answered ·

Hi @Allswell

All your data suggests that the mppt has lost contact with the batteries. The 0.00V min achieved means it isn't even reading Vbat. Maybe a blown fuse, broken wire, etc. It's going through the charge states just trying to drive current into it's own terminals.

It's not VRM.

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kevgermany avatar image
kevgermany answered ·

Looks as if your batteries are too full to accept more charge. This is a 24V system, or am I missing something?

For a 24V system, the voltage is very high, will lead to battery damage.

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allswell avatar image
allswell answered ·

And now it’s saying it’s in Float but it literally hasn’t done anything all day and yesterday.


Why is this happening after I did nothing at all and all connections are the same as they were this entire time?


Just doesn’t work anymore


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kevgermany avatar image
kevgermany answered ·

Please confirm system voltage and post a screen shot of the MPPT settings.

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allswell avatar image
allswell answered ·

Thank you yet again @JohnC. I will go through the wires and see what’s what.


Much appreciated.

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allswell avatar image
allswell answered ·

So @JohnC it turned out it was the 40a fuse on the pos+ line out of the MPPT to the main pos+ on the bank. So I replaced it and it worked as it should. Then a few hours later that fuse went as well.

Solar is offline again.

I cannot figure out what’s wrong here!

1 comment
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Matthias Lange - DE avatar image Matthias Lange - DE ♦ commented ·
40A is to low.

You have almost 1300W at 30V is 43A.

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MPPT product page

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