The recommended Gauge wires are:
KR3000: Jacketed No. 10 Gauge copper 2-wires
KR4000: Jacketed No. 8 Gauge copper 2-wires
Some installation codes are required and we recommend use of oil-
resistant cables rated for damp or wet locations. We would strongly
recommend having this installed by a certified electrician since these
wires will have a live current, if installed improperly, can be a fire or
shock hazard.
Once installed, have the wires come through the front plate by removing
the middle circle of the front plate. Once all connections are secure and
properly installed and front plate is secured back onto the front of inverter,
you can then turn inverter back ON to test out AC connection. Make sure
to test AC output from newly installed wires with a TRUE RMS Volt Meter
prior to operating from the Hard Wire connection.