Sounds like this thing has about 8,500 volts fully charged; state of the art Li-Ion cells have about 7.2 amp hours so the batteries would be depleted in 3.25 hours or so at a 25 amp draw.
Household voltage is 208-230 and 200KW divided by 230 would be 869 amps; further dividing by 3.5 hours for charging time would give us 248 amps.
200KW divided by the available 8500 volts only gives us one tenth that current (actually 23.5).
There must be something here I'm missing.
Disregard that whole paragraph. I was using values for NMh on cell voltage.
Although dated (4/01) this link has a lot of interesting info on Li Ion cells, http://www.buchmann.ca/Article5-Page1.asp.