Quote:
Originally Posted by Wilden
Just wondering, since the consensus here seems to be that more batteries is better, what do people think of using AA batteries.
You can get a pack of 4 2.7amp 1.5v rechargables for about £5 here in the uk, sometimes cheaper. If you got a load of these, and set them up to output 72v and maybe 100amps would that be as effective as using barger batteries? And more importantly, would it be cheaper?
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I doubt it, just to throw in an opposing view here but generally 2 things are true of lead acid batteries (if thats what you plan on using)
1. The lower the voltage the more reliable the battery, this is ALWAYS true
2. The higher the capacity the more reliable, this is almost always true.
Smaller capacity lead acid batteries tend to be much more fragile and last fewer cycles as compared to larger capacity batteries.
Now from a controller and motor standpoint the higher the voltage the less current, cabling etc you need but HV systems are not always more reliable, better or more cost effective, what you save on cabling could easily be offset by higher controller costs and higher battery failure rates (if you use lead).
Basically put in the lowest voltage and highest capacity that you can live with while still achieving the range and weight you need, there are always going to be trade offs one way or the other. Go really high voltage and your controller will be expensive and the batteries will be tiny and potentially unreliable.
Go too low of voltage and your cabling and weight might be heavy and your speed too low.
Good Luck