Quote:
Originally Posted by Daox
If you are forced to buy new batteries I'd have to say go with lithium because they'll be cheaper in the long run. If you're currently getting away with 100Ah lead batteries you should be able to go with a smaller lithium pack because of the advantage of being able to bring them down to a lower SOC. So, your $4k pack should only really cost around $3k. But now you need a charger and BMS to go with it...
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I am currently running a "200AH pack" (12V pairs of 100AH batts X 6 = 12 batteries). The quotation marks indicate the crappyness of my current pack.
A 70AH X 24 cell lithium pack = 5328WH X 80%DOD/300WH-M = 14 miles. Probably all I will ever need and like you say, about $3K, including mini-BMS and a 72V 10A charger. Geez, that seems doable. But I think my average current draw is too high for 70AH cells - they are rated for 3C constant discharge current and I think the eBooger draws more than that. Tonight I will know for sure.
Performance wise, I am quite happy with 72V and 450A until the batteries start going flat, that is.