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BobEdwards · 11-05-2012, 01:01 AM

Trying to decide between a 96V or 144V system. Then thought "why not both"?

If a controller (OpenRevolt?) could be modded to allow "normal" motor operation at (say) 96V (30 x LiFePO4 cells, say 90AH), then, when the pedal is to the floor, switch in an additional 48V (15 x LiFePO4 cells, say 40AH) that would give a power advantage whilst saving some battery cost, some weight saving and some space saving.

Would require 2 sets of MOSFETs and drivers, but only one (modified) controller. Would also probably need two separate chargers.

As a bonus, if you are out and about and run out of "main" battery, a contactor could be used to switch over to the bank of "reserve" cells so that you can "limp home" (or to the nearest charging place).

Or am I missing something?

11-05-2012, 01:01 AM	#1 (permalink)
BobEdwards EcoModding Lurker Join Date: Nov 2012 Location: Australia Posts: 2 Thanks: 0 Thanked 0 Times in 0 Posts	Dual Battery voltage controller? Trying to decide between a 96V or 144V system. Then thought "why not both"? If a controller (OpenRevolt?) could be modded to allow "normal" motor operation at (say) 96V (30 x LiFePO4 cells, say 90AH), then, when the pedal is to the floor, switch in an additional 48V (15 x LiFePO4 cells, say 40AH) that would give a power advantage whilst saving some battery cost, some weight saving and some space saving. Would require 2 sets of MOSFETs and drivers, but only one (modified) controller. Would also probably need two separate chargers. As a bonus, if you are out and about and run out of "main" battery, a contactor could be used to switch over to the bank of "reserve" cells so that you can "limp home" (or to the nearest charging place). Or am I missing something?