Most solar panel wires are only 10 or 12 gauge. As you run, the extra voltage drop becomes important on longer runs. The size of the manometer in this case is important not for amperes, but for the voltage drop. This is one of the few 8 gauge wires instead of 10 or 12. So I was able to get 3 volts more just by changing the gauge of the wire. This is very important when it's a cloudy day and your 100 watt panel is only putting out 18 watts. Every volt counts.
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