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Old 12-12-2008, 03:26 AM   #11 (permalink)
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Quote:
Originally Posted by roflwaffle View Post
What kinda voltage sag are you looking at Ben? That's ~29kW peak assuming the batteries stay at 72V, and even w/ losses you should be 25-30hp unless you get some serious drop. Also, Puekert's is probably killing your range since 43kWh of battery should get you a lot farther than 20 miles in a Metro, something that shouldn't be a concern in properly designed LiFePO4s.
i agree with you. In this situation, it should't be a concern in properly designed LiFePO4s.

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Old 12-12-2008, 03:25 PM   #12 (permalink)
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There is a copy of the same post as the OP on a Toronto business web site with the title "Starting a small business"

I also found a listing with a snippet of similar wording as the OP in a list on Source Guides. It is a listing for a company named EVPST. com.

Anyone know if the company is legit?
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Last edited by ericbecky; 12-12-2008 at 03:34 PM.. Reason: made error in my original post. removed links
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Old 12-12-2008, 04:30 PM   #13 (permalink)
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^
Well MetroMPG, there you go

Maybe you can get some deal for batteries on the Forkenswift? maybe an endorsement or something? It could benefit both parties for research.
Yes, I'd like a 10.5 kWh pack and a compatible charger, please!

Eric: I'm not surprised you've seen this elsewhere. No idea how legit it is.
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Old 12-12-2008, 04:33 PM   #14 (permalink)
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Quote:
Originally Posted by roflwaffle View Post
Also, Puekert's is probably killing your range since 43kWh of battery should get you a lot farther than 20 miles.
Doesn't Ben have 7.2 kWh? 72 v * 100 Ah

@ .25 kWh / mile from the pack (roughly), 20 miles observed range makes sense. (.25 * 7.2 = 28.8 miles too 100% DOD)
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Old 12-12-2008, 07:12 PM   #15 (permalink)
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Quote:
Originally Posted by MetroMPG View Post
Doesn't Ben have 7.2 kWh? 72 v * 100 Ah

@ .25 kWh / mile from the pack (roughly), 20 miles observed range makes sense. (.25 * 7.2 = 28.8 miles too 100% DOD)
I have no idea what you're talking about. But yeah, that does seem right, unless Ben has 6 100ah 72V strings.
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Old 12-12-2008, 09:26 PM   #16 (permalink)
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Yeah, I only have 7 KW, not 40 some!

I remember when I was talking to the Tesla salesman. I was just BLOWN AWAY by the capacity of their battery pack.

I did enjoy MetroMPG comparing the Tesla vs our budget homebrews on $/mile! Guess who won!?

I think we are ALL interested in better battery technology, but price is a HUGE deal breaker!
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Old 12-12-2008, 11:11 PM   #17 (permalink)
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Hi ken102282

What about a setup designed to replace a Honda Insights battery pack? Specifically the cells. The factory pack is setup for 144v, 6.5aH based off of 120 "D" NiMH 1.2 volt cells
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Old 12-12-2008, 11:30 PM   #18 (permalink)
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I've been quoted at ~$635/kWh FOB at the port of LA w/ a year warranty from a thundersky distributor for batteries that should (hopefully) last 2,000-3,000 cycles to 70% dod (.3C rates) w/ decent management, and I can buy them from a local distributor for ~$655/kWh although I'm not sure if he offers any warranty, so I'm curious what other manufacturers are selling for.

If capacity declines linearly I'd be looking at ~15c/kWh of storage or less, not counting charger efficiency. LS's seem to be ~25c/kWh, and they have worse charging efficiency, so for new batteries, provided TS' claims are accurate, LI seems to be the way to go. That said, they still can't compete w/ free used LAs, at what, ~10-15c/kWh for everything?
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Old 12-13-2008, 12:51 PM   #19 (permalink)
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Quote:
Originally Posted by ericbecky View Post
There is a copy of the same post as the OP on a Toronto business web site with the title "Starting a small business"

I also found a listing with a snippet of similar wording as the OP in a list on Source Guides. It is a listing for a company named EVPST. com.

Anyone know if the company is legit?
of coz we are a legit company. otherwise how can we do business for such a long time. I am totally understand your concern, nobody take the risk to do business.
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Old 12-13-2008, 06:24 PM   #20 (permalink)
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But at what cost per kWh ken102282?

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