Thanks biff, not quite what i was aiming at

Looking to move away from small ICEs and with the abundance of good value Li-ion 18650s on the second hand market though it might be a cool little project. Who knows if i'll actually get to do it, but it's certainly more likely than an EV.
If i'm looking for 2kWh at 240V, and taking into account inverter losses, what size of battery do i need and at what voltage would be best?