I'm guessing, but would imagine that the contract to build and install is priced up as above, but if they fail to get it all in in 100 days it's only the batter

I'm guessing, but would imagine that the contract to build and install is priced up as above, but if they fail to get it all in in 100 days it's only the batteries themselves which are free, the rest of the job still needs to be paid for.