What size wire do you use for 12 volt? That means we have to use a 12V wire size that can handle at least 12.5 amps (200W/12V = 12.5A). Accounting for the 80% NEC rule (we will explain this later on), you need a wire with at least 15.62A ampacity. In this case, we will need a 16 AWG wire size because it has a 17A ampacity.
How do I know what size solar cable I need? Amperage x Feet / % of voltage drop. Example: If you have 10 AMPs, 100 feet of distance, a 24V panel, and a 2% loss you end up with a figure of 20.83. This means the cable you need is a 4 AWG cable.
What size cable do I need from solar controller to battery?
Wire Gauge for Battery to Charge Controller.
|Controller||Wire Gauge||Wire Length|
|40 amp||8 gauge||< 16ft (4.8 m)|
|60 amp||6 gauge||< 10ft (3 m)|
|60 amp||4 gauge||10–16ft (3–4.8 m)|
What cable do I need to run solar panels? RHW-2, PV Wire and USE-2 solar cable for moist, outdoor applications. These types of wires are ideal for wiring solar panels, service terminal connections and underground service entrances.