I'm trying to build an electric motorcycle on a limited budget. I've bought John Bidwell's "EL Ninja" book, I can weld, I'm familiar with the fact that DC can kill, and I've got a fair bit of experience with metal fabrication.
So far, I'm thinking of either 60V or 72V of FLA group-24 type deep cycle batteries, an ADC motor (one of the smaller ones that will handle the voltage), whichever Curtis or Alltrax controller is cheap enough that I can afford it, and as many onboard 12V chargers as it takes to charge the batteries separately. All of these will be stuffed into a Goldwing or some similar large-framed motorcycle, running a 4.7:1 (or so) gear ratio, which should give me about 60MPH top speed with sufficient range to get me to work at that speed, or both ways if I go slowly (40 mile round trip).
There are a few questions I have, mostly revolving around batteries. Using separate chargers for each battery, they should balance themselves, right? I know that if I charge them as a pack with a higher-voltage charger, I'll have the risk of having a weak battery soaking up more than its share of the charge, leaving the others either over- or under-charged as a result. Another question - as the accessories on the bike are going to be 12 volt, is there a simple way to get 12V out of 60V or 72V? I expect that just running the 12V stuff off of one battery would unbalance the charges - but would the individual chargers solve that problem? My budget is quite low - a "solution" that costs several hundred dollars isn't likely to work for me, I'm more likely to opt for a solution that is ugly, or labor-intensive, rather than expensive. Any ideas?