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I have 6 250 watt panels wired in 2 pairs of 3. They are 50 meters from my MPPT. Wired in pairs of 3, the open curcuit voltage is around 112 volts. But when the amps increase to 20 plus amps, over a 10 guage wire, the voltage will sometimes drop below 60 volts and causes my Growatt MPPT to...