wouldn’t it make more sense if they sell these batteries with solar panels together instead of by itself. Its great having a backup supply, but if grid is down for weeks then you’ll need solar to recharge the battery
Presumably, until we here otherwise, there will probably be a number of options offered to allow maximum sales, including charged through wind, solar or conventional fuels. Perhaps even allowing it to be charged off your house to keep emergencies.
On the other hand, if it's cloudy for a spell, then you'll need the grid to recharge the battery.
And then there's the question of how your bank account gets recharged (for the cost of the battery plus the solar cells, windmills, etc., plus whatever the grid charges).
It would be neat to cut the grid off altogether. But, at present, that's still way too big a hit on the bank account.
Actually for an extra $500 I would go with the 10KW unit.