I must have gotten lost. I thought we were talking about stranded wire after abandoning the Romex. If the box has clamp on retainers fill them with hot melt glue. Makes them waterproof.
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I think I’m as lost as you because it is stranded wire.
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Ok so here’s my final setup of what I’m dubbing the Power Cart.
Made a bottom shelf for the batteries, it can hold 4 Group 31 size and these Redodo batteries say don’t go higher than 4P anyways, they can go as high as 4 Series and 4 Parallel so a 48v 400AH. These are their cheapest option that don’t have a cold temp protection but these will be indoors at all times, non-issue.
I turned off it’s built in Charging option, has a setting for that. I didn’t like that it used higher volts to fast charge because the High Voltage cutoff for these batteries is 15v. I have a dedicated 40a lifepo4 charger anyways.
I downgraded the Input wire to some 14ga, it’ll handle the 15a max input when it’s in bypass/UPS mode.
I got the 10ga wire in there at just the right length and removed the rubber 3 hole internal grommet and just used E Tape to make up the thickness.
I then zip tied my cables to the roll cart frame to reduce any stress. I might get a better cable clamp at the outlet box side of things, maybe with those coil spring stress reducers like McMaster has. I taped around all that as well though. I’m probably going to add a hook to hang the extension cord off the side or add a second shelf above the batteries.
When I tested this with 300AH I didn’t get a definitive time because it lasted all day and died in the middle of the night, I’m going to guess over 15 hours maybe 20 hours.
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Figured out a way to stiffen the clamp fitting at the outlet box. I’ve already wrapped e-tape around the wires underneath the clamp so they won’t get bit down on, and then I wrapped e-tape around the clamp fitting and then wrapped vulcanizing tape around that. Super stiff and it’s anchored to the outer sleeve of the 10ga cable.
I’m going to look for a 3D printable plastic box that can go around this metal one, I can already hear my mother worry about touching it and getting shocked even though it’s installed by the book and grounded out properly.
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