I had a good test of my level 2 backup power supply, and I upgraded it a little. I needed to run some power tools to work on a chain link fence that had a tree fall on it, and it was too far out to use extension cords. I decided to palletize the power supply, and I used a small convertible hand truck which turned out to be just the right size. I built a platform to keep everything in place.
The inverter is a KISAE SW1220 2000 watt pure sine wave inverter (3000 watt surge). The batteries are two DieHard Gold Advanced AGM, 75 amp hours each. Harbor Freight just started carrying a 3 foot 2/0 AWG inverter cable, which is just the right size. I was using a 1/0 AWG cable that I got off of Amazon, but the connectors are getting loose on it, and it is not quite big enough for full power. The two batteries are connected by a short auto battery cable. I need to get a little bit beefier cable to connect the two, but I figured that the battery connected directly to the inverter could handle any surge. I'm probably going to order some cable lugs on Amazon and cut some of my longer cables into shorter cables. I have a 1/0 AWG cable that I was using to connect the batteries, but I have to coil it up on top of the batteries. I'd much rather just use a 1' or shorter cable.
First I needed to clear out vines and limbs with the hedge trimmer so I could get to the fence. Then I had to run a reciprocating saw with a carbide tipped bit to cut out the bent top poles. Then I used a drum sanding bit on my drill to smooth out the ragged edges of the poles I cut. When I finished working with the power tools, the voltage meter said 12.9 volts, so my batteries hardly broke a sweat.
Here is the Level 2 power supply, with my Level 3 power supply behind it. Level 2 is equivalent to one 20 amp home circuit. Level 3 is equivalent to three 20 amp home circuits. Level 1 is a 600 watt pure sine wave inverter powered by a 100 amp hour marine deep cycle battery. Level 4 is a propane generator.
Oh, and those are Schumacher SC-10030A 30 amp charger/maintainers that keep a 13.5 volt constant float voltage.