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I meant the drill batteries. Get at least 8 of those big 9.0AH ones and forget about the solar panel and extra inverter ;)
Here's that link again:
https://www.amazon.com/DEWALT-DCB609-2-FLEXVOLT-Battery-Pack/dp/B06WP6GJ4M/ref=pd_sim_469_1/134-0298947-4711315?_encoding=UTF8&psc=1&refRID=TJY8QPRDFVNP9N0N4R8Y

That plus your smaller ones with the tools you already have should do the trick all day I'd think. Then maybe solar later? lol

Those are LOTS Cheaper than the Milwaukee Red Lithium 9.0AH batteries I saw locally, $179 each! OUCH! $103 for the DeWalt

when I got the PPS it came with four batteries...
I already had two so that makes six total now.
those suckers are EXPENSIVE..the big one cost $100 each.

the one I saw with batts had 3x 4AH and 1x 6AH, but the link I provided is 2x 9AH for $206 and the run times for the PPS would be a lot longer. $412 is a lot of fiat but it is immense back-up power.

The new DW lineup is pretty impressive!

I got a literal crap-ton of Li-Ions when Radio Shack shut down, like 32x on the 26650 cells, I need to build a back up power pack with that, I think ;)

yup...I would.
there are u-toob video's about folks doing that very thing.

A spot welder is much better than soldering on to the end plates of the cells, (as many U-TooberZ do) I am thinking HARD about getting one ;) I think my retirement job is going to be Battery Tech Deluxe :D