ajriding wrote:
I assume I can pull 20 amps through the "load" terminals since it is a 20 amp unit.
The amp rating is for what the unit can charge to the battery. Most of the load terminals on the controller themselves are rated for less. Definitely check with the manufacturer before you buy. Our older Renogy 40 amp MPPT stated only small DC loads were acceptable on the load port. They used the example of a single led light.
Maybe other manufactures allow full rated amperage but I would definitely not assume that.
From Renogy:
The load terminal is only compatible to run one small 12 V DC load with low amp consumption.
All the other devices and appliance with surge and high amp draw should be connected directly to the battery.