Dave, I plan to build a few of these. The one above will be for testing purposes mostly and will probably run a 2m radio in my garage. The next couple I plan to build around 2 x 100 amp hour batteries and I plan to hook them up to 2 x 100 watt solar panels.
A generator is too easy…
Marco, you got any that are AGM (gell cell)? For the ones in boxes I don't wanna have to deal with corrosion and venting. But might be interesting to see what we could come up with using a whole mess of old car batteries to make a franken-rig.