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mchave asked

Batteries in Float Mode at 66% or Less

Hi,

Since installing my solar kit, I've been having a problem: my batteries are discharging more than they are charging. My MPPT indicates that the charge state is in float mode while the batteries show me there are only at 66% capacity (despite strong sunlight). This percentage can drop to 20%, forcing me to recharge my batteries using AC power. I have enough solar panels to generate up to 1500W. Do you know what might be causing this? Could it be a configuration issue on my part? You will find all the information in the attached photos.

Same problem after system update.

Thank you.

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1 Answer
JohnC avatar image
JohnC answered ·

@mchave

Your SOC is incorrect. You don't say where it comes from, but unless you've added a shunt then it will be the internal one on the Multiplus. Probably the solar Absorb V is set lower than that in the Multi, so it never syncs. And it's drifted.

The rest of your info shows a lightly loaded system that is working fine. The SOC figures don't make sense with that history. Might be time to hit the manuals to find out how to tune it.

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