On Sunday a good friend came around with an old PIP4048 inverter/charger. Finally I can put my battery to use!
This inverter/charger is designed to take DC from solar panels (no more than 120 VDC) and charge a 48 volt battery. It also has an inverter which allows it to provide up to 4 kVA of power AND it has a built-in battery charger from mains. In effect this is an off-grid inverter with grid (or generator) backup. Nothing is exported with this inverter.
Since the charger was optimised for lead acid I'm not sure about using it to charge the battery - not that it matters as I bought myself a new 25 amp, 48 V lithium charger.
With the inverter hooked up to the battery it was spitting out a nice 230 VAC, to which I charged the scooter and my friend's iMiEV. It took about 2.7 kWh based on the in-line AC energy meter.
I charged the battery up during the day, putting about 3 kWh worth of sunshine derived electricity in, and this afternoon, plugged the scooter in to charge. I was curious as to the watts out of the battery versus watts into the scooter - power cabinet battery clamped at 34 amps and 52 volts, while the scooter was accepting 26 amps at 55 volts. So about 80% conversion efficiency. I think there are more efficient ways of doing this
Probably have to find myself a 48 to 48 DC/DC converter or something.
I took the FLIR camera home from work and had a look around. The mains power timer seems to have a bit of phantom draw.
The cells were warm, but only 29'C after a good hour's discharge at 34 amps.
An example of why you should use 2.5 mm2 extension leads, not 1.0
Very happy with it so far!