Review on 🌞 Valterra Go Power! GP-PWM-30-UL Solar Controller – 30A, Digital, Black by Mike Quade

Great product. Looks good, works good, sure. First I found that the battery voltage is lower than the true battery voltage. I read the manual and it said to measure and compare the voltage across the terminals and the battery and some nonsense about how sometimes it looks wrong but in fact it is correct. I also found that it was correct when there was no charging current, but incorrect when 27A was flowing. In the end I found that I had too much work to do installing it. I ran short, thick cables between the device and the battery, which I thought was the right thing to do. It looks like the GP-PWM-30 was too smart for me and expected me to use longer, thinner cables. I tried this and found that the device recalculates the high current battery voltage. From there I was able to adjust the wiring impedance to get the correct battery voltage at all times. This is a clever feature that works well, but it would be nice to have it documented in the installation guide section. BTW the correct impedance between the GP-PWM-30 and the battery seems to be around 1.5mΩ or 0.75mΩ for each wire.