Robert,
Please don't interpret my argument for flooded lead acid as an enthusiastic endorsement of the technology, my experience has been that it really does kind of suck on many levels and has been a big disappointment from a performance standpoint. But if you don't have 8k for your battery pack, a million golf carts is a testament to the fact that a $1000 bucks will get you there. Also, with the high cost of Lithium, the overall life cycle cost is really too close to call definatively at this point with a too many variables.
If you have the cash, who wouldn't rather drive the Testerosa? (Even if it does cost more). But the technology is still a bit fluid with lots of "claims" of superior performance that don't always pan out. Note that Boeing just switched from Lithium to NiCad after a very expensive failure of the Lithium technology in thier Dreamliner.
It's good to hear that your experience with LeFePO4 was very positive and that's definitely the kind of feedback the industry needs.
Lithium chemistry is probably the future but in the mean time, some of us are still stuck with what we can afford and my argument is that lead is not quite dead, yet!
Carter
From: Robert Lemke <robert-lemke@att.net>
To: electricboats@yahoogroups.com
Sent: Wednesday, February 20, 2013 10:49 PM
Subject: Re: [Electric Boats] Re: Comparing FLA to LiFePO4.
To: electricboats@yahoogroups.com
Sent: Wednesday, February 20, 2013 10:49 PM
Subject: Re: [Electric Boats] Re: Comparing FLA to LiFePO4.
| Since this is being kicked around I'll throw in my $0.02 and isn't worth that. I recently went the LiFePO4 route and from my tests I'll never go back to lead. The first thing I discovered was how conservative the a-hr rating is in real world usage. Over the years I grew accustomed to the 20 hour rate of lead acid. I purchased (8) 100 a-hr LiFePO4 cells and found that at that easy 20 hour rate they should have been rated 150 a-hr. Pulling 100 amps for a 1 hour rate they still managed 125 a-hr. That just doesn't happen with lead. A 60 lb group 27 battery gives my electric kayak a 16~18 nm range. The same weight of LiFePO4 gives me 80 nm. Fast charge acceptance is another perk, as I can pull into a marina bar/restaurant and my 8 lb, 50 amp charger will refuel the battery in the time it takes to have lunch and drinks. BTW, the charger has a lithium profile and was less than $200. Another positive is very small voltage sag under heavy draw and not much voltage swing during discharge. Combine all this with 2000+ cycles and electron energy storage doesn't get cheaper than this. Lead is Dead. Off of soap box now. Bob aka "deckofficer"
|
__._,_.___
| Reply via web post | Reply to sender | Reply to group | Start a New Topic | Messages in this topic (20) |
.
__,_._,___
No comments:
Post a Comment