Solar charger throttles output as soon as battery reaches 100%

DIY
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1

Hello Group,

Maybe somebody is able to explain, why solar charger (BlueSolar Charger MPPT 150/35 rev3, under Cerbo control) throttles output as soon, as battery reaches 100%? DC-coupled PV feed in excess is ON.

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2

This problem is already discussed in some other threads here, but I think in the german section.

Also at my system, the mppt throttles down to 0W when battery is charging near to 100%, but at my system the mppt starts again working after about half an hour. So I don’t really care about that.

3

When battery is charged, MPPT works at about 1/4-1/5 power. As I see from graph, it throttles current.

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