"David Roden (Akron OH USA)" wrote: > > > LiIon TS-LP42V > > Price $1300 in 1001 qty > > Weight 35Kg > > 100Ah * 42V = 4200Wh > > energy density 120Wh/Kg or 154Wh/Litre > > price per kWh: $309 > > Cycle life: 500@80%DOD > > > > When you factor in cycle life and look at cost per (theoretical) delivered > kWh, nicads come out even better, 21% to 60% lower per kWh: > > NiZn MB100-12 (taking cycle life as 800, a guess): $0.61 / kWh > > LiIon TS-LP42V (cycle life 500) $0.62 / kWh > > Nicad STM5-100MR > (cycle life 1000, 120ah): $0.48 / kWh > (cycle life 2000, 100ah): $0.29 / kWh > (cycle life 3000, 80ah): $0.24 / kWh >
To add a few data points to TS-LP42V: cycle life > 500 at 80 Ah: $0.618/kWh cycle life > 1200 at 50 Ah: $0.26/kWh cycle life > 2400 at 20 Ah: $0.13/kWh Not quite as good as NiCd, but the pack is twice as light. Question: How come MRE100 are 120 Ah, not 100Ah? cycle life 1000 at 100% dod is not valid point, you don't get any performance at about last 5% of capacity (sag) so while SOC is still 5% (not 0%) the battery, while won't get damaged, is not useable. If you only look at life time nothing beats NiCd. All to all, PbA everyone uses comes out almost the most expensive per kWh for its life. Majority is not so rich, nor uneducated, so my guess lowest initial out of pocket cost is the first priority... Victor
