12-12-2008, 04:26 AM
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#11 (permalink)
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EcoModding Lurker
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Quote:
Originally Posted by roflwaffle
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.
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i agree with you. In this situation, it should't be a concern in properly designed LiFePO4s.
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12-12-2008, 04:25 PM
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#12 (permalink)
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EcoModding Seeker
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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?
__________________
Eric Powers
Your Hybrid Battery Hero
EV Powers Hybrid Battery Service and Repair
Madison, Wisconsin
www.evpowers.com
Last edited by ericbecky; 12-12-2008 at 04:34 PM..
Reason: made error in my original post. removed links
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12-12-2008, 05:30 PM
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#13 (permalink)
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Batman Junior
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Quote:
Originally Posted by DifferentPointofView
^
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.
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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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12-12-2008, 05:33 PM
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#14 (permalink)
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Batman Junior
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Quote:
Originally Posted by roflwaffle
Also, Puekert's is probably killing your range since 43kWh of battery should get you a lot farther than 20 miles.
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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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12-12-2008, 08:12 PM
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#15 (permalink)
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Quote:
Originally Posted by MetroMPG
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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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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12-12-2008, 10:26 PM
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#16 (permalink)
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EV test pilot
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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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12-13-2008, 12:11 AM
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#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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12-13-2008, 12:30 AM
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#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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12-13-2008, 01:51 PM
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#19 (permalink)
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Quote:
Originally Posted by ericbecky
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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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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12-13-2008, 07:24 PM
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#20 (permalink)
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But at what cost per kWh ken102282?
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