R.i.p. 2kw enginer kit

Discussion in 'Prius PHEV Plug-In Modifications' started by kammssss, May 1, 2011.

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MJFrog Active Member

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2018 Nissan LEAF

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adric22 said: ↑

You know, that is an interesting idea I had not considered. Most of the problems people report with the Enginer system are from the charger, BMS, and battery packs. So going with lead-acid batteries would actually eliminate most of that, and I dare say the optimas will be more reliable. The only real issue is that Optima batteries have poor cycle life, around 200 cycles, I think. Might be better off with some other type of sealed lead-acid batteries. I've always heard that lead-acid batteries are bad for the calcars design because the regenerative breaking will tear them up. But in the enginer design with the DC-DC converter, that wouldn't really be an issue. Unfortunately, you'd have to build your own battery racks because obviously these batteries won't fit where the originals did.
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If I do it right (and I haven't really started yet), I'll try to keep SOC between 40-80% like Toyota does. That should increase #cycles. Not really sure how far it is possible to drain them. The DC-DC converter has a low voltage cut-out that will prevent a 100% drain. Otherwise, your points above are valid.

#41 MJFrog, Jun 1, 2011

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