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Do you really need dumping power directly via relay? You could have used it to disconnect the PV panels. It will not harm the PV panels. Although if you want to use this same circuiite to charge your power bank via wind turbine then dumping may be a good Idea but still why via Relay? why not via a second dummy load (a light bulb)?
Bike wheel induction safety light
Adaptable 12vDC/220vAC Pure Sinewave Inverter
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