I've been looking at these from a few suppliers ,
I have a PV system,
and what do I do with extra energy, export it , or use it to heat .
the house base load is around 300 watts ,
so a battery of 'only' 14 KWh would be fine to cover my background needs assuming 50 % efficiency in the DC:AC,
And I generate that each day or more 9 months of the year.
For reference a standard 200 Amp H car battery is around 2 KWh though I'd not use them,
The batteries in the Teslar are 60KWh if I remember, so more then enough to get me off grid most of the