As I said there is no perfect chemistry. But for simple, the NiMH is simpler than lithium. Full discharge is a nice idea but simplicity leaves. BMS is necessary so you don't reverse bias a cell.
Source impedance of lithium is great!. Thats why they burn things down if shorted. Red hot metal starts a lot of trouble.
I am not so concerned with efficiency when I plug in. Reliability and cost are higher priority.
Thanks for the tip re Vectrix.
Cheap is essential to my budget.
Kirk
Love is so short, forgetting is so long.
From: James Sizemore <james@deny.org>
To: "electricboats@yahoogroups.com" <electricboats@yahoogroups.com>
Cc: "electricboats@yahoogroups.com" <electricboats@yahoogroups.com>
Sent: Tuesday, June 12, 2012 11:10 AM
Subject: Re: [Electric Boats] NiMH Batteries Suppressed; Dept.of Progress
NiMH are not as awesome as you may think in traction application. They require a BMS in full discharge application unlike hybrids. As a Vectrix owner I know there drawback well, and like almost all Vectrix owners, I am planning to upgrade to lithium. NiMH has a higher internal resistance, this make them more expensive to charge and they generate a lot of heat when used, unlike lithium they need active cooling systems as well as a BMS.
And even the low density LiFePo carry more charge per pound. But if I can't talk you out of wanting some Ni cells stop by any Vectrix forum as many of us are switching to lithium you can pick up used cells on the cheap.
I am sympathetic to your rationale Craig.Since the end user may use a patent royalty free for his own usea "kit" that the end user finishes is a possible end run around this quagmire the oil companies have erected around electric transportation. Same with motors. China charges a lot for a 500 watt - 1 kilowatt bicycle motor.Bicycles see lots of useage in Asia and Europe uses them loads more than the US. I would love an e bike but the expense is exorbitant. And since batteries are so expensive the motor needs high efficiency, above 90%Trickle charging a NiMH overnite reduces charger cost. Now all you need is a $20 variable pulse width controller as a throttle.KirkLove is so short, forgetting is so long.
From: Craig Carmichael <craig@saers.com>
To: electricboats@yahoogroups.com
Sent: Tuesday, June 12, 2012 9:21 AM
Subject: [Electric Boats] NiMH Batteries Suppressed; Dept.of Progress
> >
>> I think some of these patents expire 2014
>>
>
>It's depressingly easy to extend the patents if some one thinks there
>is some commercial value in holding them...
>
>There is entire branch of the legal profession dedicated to it these days.
Everybody's forgotten that patents were created so an *inventor*
could get paid for his work without having to switch careers -- ie,
to start a factory and turn himself into a businessman. But it
virtually never works.
Instead they're used as *business* tools to impress investors (little
patents), or hijacked to suppress priceless new technologies
(groundbreaking patents). The usually unsuspecting inventor is
manipulated out of the picture by experienced businessmen and
forgotten. A musician has more rights to his song than an inventor
has to his invention.
That's why I patent nothing and publish to the web instead. No chance
to make money... but to be realistic, there isn't anyway.
I would venture to guess that applications to extend patents never or
virtually never come from the actual inventor. But who else should be
entitled to apply?
--- Department of Progress ---
I've proposed a government "Department of Progress" or "Department of
Patent Administration" that would hold all patents and collect
royalties on behalf of inventors (and to fund the department itself
without taxation), as well as to solicit and fund development work
contributing to national goals like sustainability, so often given
lip service to and voted for in legislatures, but presently with no
department administering them and carrying out the program, in any
country.
Only when businesses are up against the government will they
recognize royalties on patents as a legit business expense, and they
won't be able to 'acquire' patents to prevent progress.
The country that starts this first will find inventors flocking to
file patents there, and will be enormously strengthened by exports of
new technology products made by the progressive industries that will
surely take root.
This idea is mentioned in a couple of places in Turquoise Energy News.
Craig
http://www.TurquoiseEnergy.com/
http://www.saers.com/recorder/craig/TurquoiseEnergyNews/
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