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richard-1 asked

Issue with multiple MPPT controllers working together (or not)

I have a 14kWh LiFePo4 battery,(offgrid) with BMS managing a Victron Multiplus, Cerbo GX, 2 x MPPT 150 controllers - One BlueSolar and one SmartSolar. My MPPTs strategically manage a solar array that catches morning sun (BlueSolar) and a solar array that catches afternoon sun (SmartSolar).

See Screen shots:383211470-875278797577315-6619112143156937372-n.jpgSmartSolar.

384300307-3162464737389364-2725876610653211387-n.jpg

BlueSolar

384329165-3477045622625961-7988658067457349273-n.jpg

Dashboard

The problem is that once SOC reaches 100%, SmartSolar (279) stops collecting solar for the rest of the day. This is problematic because I cannot get any solar in the afternoon.

Someone recommended setting the Absorbtion point lower on the BlueSolar (278) so that it would stop collecting before SmartSolar, meaning that SmartSolar should keep collecting all afternoon.

But this has not fixed the problem.

Any other ideas?

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klim8skeptic avatar image klim8skeptic ♦ commented ·
@richard@longwalk.info your BMS is controlling the mppt's.

You might want to give the BMS a poke with a stick.

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Sten avatar image
Sten answered ·

As @klim8skeptic mention, your solar charger is managed by the BMS. When your battery is full the BMS will reduce power from the solar. Normaly the BMS should support your load with power from the solar, but if it doesnt I think the problem is in the BMS.

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