If you are going to carry 150 pounds of lead around, make it useful lead. You could run twin strings of batteries with two separate chargers. You could use them together under load. When the load is removed, disconnect the strings from each other. I would open the AGM contactor and leave the Li-ion contactor enabled at stop lights and when coasting. A couple big diodes could do this without the noise but would require a heat sink.
Joe Smalley Rural Kitsap County WA Fiesta 48 volts NEDRA 48 volt street conversion record holder [EMAIL PROTECTED] ----- Original Message ----- From: "Lonnie Borntreger" <[EMAIL PROTECTED]> To: "Evlist" <[EMAIL PROTECTED]> Sent: Tuesday, October 01, 2002 3:47 PM Subject: RE: SAFT NiCd's, or Evercell NiZi vs a Sparrow > On Tue, 2002-10-01 at 14:18, Chris Tromley wrote: > > In a Sparrow, the weight of the batteries is an advantage (I would argue > > a requirement) in terms of stability. The degree to which you lighten > > your pack is the degree to which you increase the likelihood of a > > rollover. I think the weight difference when changing to an Evercel > > pack was around 150 lbs. I know that doesn't seem like a big deal. But > > the Sparrow is so tiny that it doesn't take much in terms of weight > > reduction or movement of your cg location to make big differences in > > handling. In a normal car, you can make big changes in weight > > distribution just by moving a few batteries around. You're suggesting > > you pull the equivalent of three batteries from where you need the > > weight most. > > So add 150lbs of something to the battery pack (line it with lead or > something). That way you get the extended range of the advanced > batteries, but don't mess with the center of gravity of the Sparrow. Of > course the extra weight will reduce range a little, but not as much as > sticking with the older battery chemistry - I would guess. > > Lonnie Borntreger >
