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mrjo asked

MPPT 75/10 charging only in low light

Hello, the following setup to the question: motorhome, semi-flexible, monocrystalline 100W module, SmartSolar controller 75/10, offgridtec gel battery 100Ah. The panel provides power even in low light. If the voltage is 5V above the battery voltage, the regulator turns on. If it then becomes sunnier, the controller switches off again, for example in the low 2-digit range. Then the PV voltage always remains slightly below the battery voltage - switching on impossible. When driving, the following has happened: in a shady forest, the controller suddenly switches on, charging current immediately there and, out of the shadows, over 40W. Since I like to be self-sufficient, the system should of course supply as much electricity as possible, especially in the sun. Can anyone tell me anything about that? Thank you in advance.

mppt charging
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Alexandra avatar image Alexandra ♦ commented ·
@mrjo

The panel is rated at 100W at 25°C if it is getting hotter than that then the output of the panel will drop.

It is also possible that there is a fault in the panel and when it cools off a connection is remade and then produces again.

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