Anyone researched Telsa's 7kW battery?
http://liveoutdoor.co/5210209-15834752 Here is another link. Battery name is powerwall: https://www.teslamotors.com/POWERWALL Little expensive right now
Forum Discussion
I suspect the 400 volt level was chosen as a match for a 240 volt inverter, since the peak of 240 volts RMS is ~340 volts. A 200 volt battery would be a better match for the 120 volt inverters used in RVs. Since the inverters we now use have to first step the voltage up to at least 170 (for PSW), a high voltage battery would eliminate the efficiency loss of the voltage step up.
