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chebanov avatar image
chebanov asked

PV Solar Power on MPPT Drops from MAX to 0

I use MultiPlus II 48/1600/20, CCGX, MPPT Solar Charger 100/20 and third party BMS 48V-100Ah LiFePo battery. During the sunny day, the Solar Power drops from max to 0 few times a minute. Inverter started to discharge the battery until the PV Power raise. System configured with ESS and "Keep batteries charged" mode. Without DVCC. The differents between dashboard screenshots is actually few seconds. Could anyone help me?

Dashboard1.png

Dashboard2.png

PV Yield.png

MPPT ControllersESSlow power
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2 Answers
chebanov avatar image
chebanov answered ·

I'm suppose that problem was solved. My consumption was equal 260W but the Solar Power on peak reached 800W. And with feed-in disable - the excess energy had nowhere to go. When I increase the charge current on MPPT to 7A (7*48=336W), which is enough to cover the consumption - the problem disappeared.

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nickdb avatar image
nickdb answered ·

Hi, there isn't enough to go on.

Pull vrm charts (or use victron connect) to show what PV voltage is vs battery voltage.

Panel voltage could be dipping beneath the battery +6V threshold and moving to an off state.

Pull charts that show the BMS CVL and CCL. The BMS may be limiting the MPPT via DVCC.

Or you could have a bad connection, wiring or panel.

Any number of reasons.

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chebanov avatar image chebanov commented ·

battery-vs-pv.pngBMS is not connected to the system. It's only built in battery.

DVCC is disabled.

I see that MPPT state occurs Fault frequently. How can I find out why?

mppt-state.png

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