If you do the one charger how will you properly charge all the batteries to the same level. It seems from watching this list for year that the best approaches are a.) one charger for the series string and utilize a BMS to ensure all the batteries are at the same level of charge, or b.) individual chargers and no BMS - I am charging 6A per battery at the same time and each charger goes into the final stage when the time is approriate. You are clearly making it harder on yourself to have to break the series connections between the batteries.
Time for the series charge/BMS guys to chime in here. Jeff On Wed, Mar 12, 2008 at 9:50 PM, Andrew Wowk <[EMAIL PROTECTED]> wrote: > In concept, I have to disagree. It is simpler, cheaper, and less bulky. I > think in abstract terms, all we are really trying to do is break the battery > pack which is really just one large battery by definition, into 6-cell > sections for charging. I don't see why one large 12v charger wouldn't work > well, if not better due to being simpler and easier controlled. > > However, there are some advantages to having individual chargers: > > ⚫ The maximum current should always be within a predefined limit. It may not > be with the batteries in parallel & one large charger, due to variations in > the batteries, battery temperature, and the variation in wire lengths > connecting them. > > ⚫ If the chargers check for battery problems and give some feedback, they > may not be able to do this properly w/batteries in parallel. > > ⚫ In the case of a battery w/shorted cell, the other batteries will be > charged properly. This may not be the case with batteries charging in > parallel. > > Andrew in NM > > > > On Wed, Mar 12, 2008 at 8:29 PM, Jeffrey Blamey <[EMAIL PROTECTED]> > wrote: > > Sorry as far as the chargers go you can leave the normal series > > connections in place, and wire each charger to each battery. 6 > > chargers at 6 amps each running their own charging algorith based on > > each battery state of charge is preferable to one large charger trying > > to charge 6 batteries in parallel. > > > > Just imagine the series string is open, when it is charging it better > > be. I have left the chargers in the circuit when the bike was turned > > on but the chargers disconnected from their ac source. No appraent > > problems with the Electricross chargers. > > > > Jeff > > >
