I just won a bid for twelve Prius packs! They should hopefully be arriving later this week or early next.
Update: Batteries arrived and ready to be installed!
Each pack is a 7.2 volts 6.5 Ah prismatic NiMH battery with six cells. I'll be configuring them as 6S2P for 43.2 volts 13 Ah. I'm hoping that I can get at least 60% of the SOC from them (80% to 20% as on the Prius). That would be 43 volts, 7.8 Ah or 335 watt-hours.
This is perfect as I'm currently consuming 200 watts-hours each way with the heavy SLAs. The lighter NiMH packs should get my power consumption down even lower.
| Type | Description | Wh | Weight |
|---|---|---|---|
| SLA | Tempest TR35-12 (rated 35Ah) -- 35 Ah @ 36 volts -- I don't get 35Ah, closer to 10 Ah due to Peukerts Specific Energy 35 Wh/kg nominal Specific Energy 10 Wh/kg derated | 360 Wh | 1 @ 11.8 kg
3 @ 35.4 kg (78 lb) |
| NiMH | Prius Gen II Battery (rated 6.5Ah) @ 1040 grams -- 13 Ah @ 43.2 volts -- derated 60% for a conservative Ah of 7.8 Ah Module Weight 1040 g Specific Power 1300 W/kg Specific Energy 46 Wh/kg nominal Specific Energy 27 Wh/kg derated | 335 Wh |
1 @ 1.04 kg
12 @ 12.48 kg (27.5 lb) |
It looks like I'll be saving a good 20 kilograms or 50 pounds with only a slight loss in Watt-hours! I will have to bodge up a new battery carrier as the cells need to be kept under compression when being charged.
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