samsavvas
100 W
Hi Folks,
I'm running a 23.5ah 52V EM3ev battery on my Big Dummy to drive a BBS-HD set at 30 amps. Despite the battery's large capacity I ran out of juice the other night and had to pedal a very(!) heavy, loaded bike home unaided for the last 6km - too far for an old bloke! So I am now considering a smaller frame-mount 48v backup battery - maybe 11 or 13ah.
What's the best way to select a backup battery? Have others addressed this question at all?
Thus far I've thought of 3 alternatives (and their potential problems):
- get a 2-way on-off-on selector switch like the ones used in boat ignition systems (may not be able to handle 30 amps!)
- just unplug from one battery and plug into the other (loose cables wandering about)
- construct a 'plug box' to plug one or the other battery into (may not be able to get XT-90 panel connectors, still have loose cables).
Ideas and experiences would be very much appreciated.
Sam.
I'm running a 23.5ah 52V EM3ev battery on my Big Dummy to drive a BBS-HD set at 30 amps. Despite the battery's large capacity I ran out of juice the other night and had to pedal a very(!) heavy, loaded bike home unaided for the last 6km - too far for an old bloke! So I am now considering a smaller frame-mount 48v backup battery - maybe 11 or 13ah.
What's the best way to select a backup battery? Have others addressed this question at all?
Thus far I've thought of 3 alternatives (and their potential problems):
- get a 2-way on-off-on selector switch like the ones used in boat ignition systems (may not be able to handle 30 amps!)
- just unplug from one battery and plug into the other (loose cables wandering about)
- construct a 'plug box' to plug one or the other battery into (may not be able to get XT-90 panel connectors, still have loose cables).
Ideas and experiences would be very much appreciated.
Sam.