I use 25-27Wh/Kg for lead, 50-55 for NiCad and 70-75 for NiMH. I find that with higher current draw, you might want a slightly lower number for lead. With packages that have more "package" (individual cells versus modules for example) this figure can go lower. A stainless encased NiCad might be an example.
This puts vanadium oxide at better than lead acid *if* the figure of 35Wh/kg is correct. I didn't check the website for this figure, so use it at your own risk. Seth Lonnie Borntreger wrote: > > On Mon, 2002-09-23 at 16:30, VanDerWal, Peter MSgt wrote: > > David's soap box is in no danger. You DID get the units wrong when you > > copied it. The website clearly states Wh/kg not kW/kg as you posted. > > > > "In the all-vanadium redox flow cell, the present energy density is 25 > > Wh/kg, this being based on a maximum vanadium ion concentration of 2 M or > > less for wide temperature range operation. " > > > > "More recent studies at UNSW has shown that vanadium concentrations of up to > > 3M can be achieved with addition of precipitation inhibitors that can > > stabilise supersaturated vanadium solutions. This allows the energy density > > to be increased to around 35 Wh/kg. " > > OK. So my eyes failed me twice. My apologies to David. > > So, back to my original question, how does this rating look compared to > current EV batteries in use? > > Lonnie -- vze3v25q@verizondotnet
