Re: [EVDL] Tesla batteries (maybe good news via Valence batteries)
[email protected] <[email protected]xx> wrote:
> < $7500 of batteries would be 11.5kWh with 96kW continuous power rating, and
> it would only weigh 126kg. >
>
> ...but the specs don't show any welding tabs, so you'd have to add on
> the price of creating connections, too. You can find Dewalt packs near
> $100, and those 10 A123 cells will all have tabs (just not the kind
> used in the Killacycle).
>
Yeah, but that costs twice as much per cell, at roughly the same
capacity. I don't think it's worthwhile to pay an extra $5/cell for
tabs. (I know you also get the plastic case and BMS, but I still don't
think it's worth the price increase.)
-Morgan LaMoore
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Jeff Shanab wrote:
> I was thinking 144 cells per module for 19.2V and 55ah
Sounds a lot like the Valence UEV-18XP module (19.2V, 65Ah)
> figure $100 bms per module and $25 case and $25 interconnects
> and we are talking a raw cost of $870/module or about 15K for such a
> pack. Still a bit high to make a profit on, but getting closer.
Neglecting the NRE costs associated with developing and testing the BMS,
and amortisation of the cell weldign equipment costs, etc...
> reconfigure the modules to 12.8V 86ah and put in 24 modules.
Pretty close to the Valence U24-12XP (12V, 100Ah) module.
Other than someone who thinks they can make a business out of buying
Valence cells and building them into modules cheaper than Valence can
for resale, it seems to me that it is more practical/realistic to buy
Valence modules that already have a proven BMS built into each case and
for which there is a Valence string-level BMS available. Its available
right now and is plug and play... Yeah its more costly than you think
you can do it for, but probably about the same as you'd have to charge
to sell yours.
Cheers,
Roger.
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