Best Battery Voltage Choice?

[PeteCress]

• Tadpole trike, 300# including rider,
• Tongsheng TSDZ2 capped at 340 watts, used only on steep hills or in special situations where we want to get through a stretch of road ASAP
• 99% of time max draw is =< 250 watts,
• Additional constant load from LEDs on a 6' "Glow Whip" flag holder
• Max desired speed = 18 mph, but mostly =< 3 mph in 1st gear ascending said steep hills
• Currently running 52v

Would some other battery voltage give better performance in terms of bang for the buck, distance per watt hour or whatever?

 

[brmwia]

how long of rides?

 

[E-HP]

If it's already meeting all of your requirements, and will be imposing the same limitations, then no.
As far as bang for the buck goes, is this assuming a controller modification or swap as part of the buck?

 

[Chalo]

Most 36-48V controllers have 63V capacitors and other components that would be outside their specs if used at higher than 14S fully charged voltage. If you're confident to substitute 100V items for the lower rated ones in the controller, you can go higher on battery voltage, up to 23S. But you must be sure to swap all of them.

At your current power level, there wouldn't be a compelling argument to make for changing voltage to improve Wh/mi or component cost. You might get slightly better Wh/mi by switching to a lower voltage e.g. 48V (13S) or 44V (12S), if that puts the efficiency sweet spot closer to your normal pedal cadence. For what it's worth, there are some 12S automotive battery modules out there that offer very very good cost per kWh.

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