Size of cable depends on the length of run from battery, assuming you're hard wiring to the battery.
If you let us know the length of cable, can tell you the size, assuming it's being fused for a max current of 25A at 12 volts.
Without the correct calibration chute was struggling to find a bag or similar to catch all the seed for calibrating the Fan Jet.
So tried this and worked well, so just sharing the idea.
For the RT police, it's AB9 stewardship untreated seed.