Well, I'd go by the test data, though there will be some variability in
results. May also be some variability in what different websites give for
the 20 and 5 hr rates.
--
View this message in context:
tomw via EV wrote:
I used the standard method of applying the Peukert equation to calculate the
exponent based on the manufacturers published 20hr and 5hr rates for the
Trojans. If the 20hr rate is A, the 5 hr rate is B, the capacity at rate
A is CA, and the capacity at rate B is CB then:
I used the standard method of applying the Peukert equation to calculate the
exponent based on the manufacturers published 20hr and 5hr rates for the
Trojans. If the 20hr rate is A, the 5 hr rate is B, the capacity at rate
A is CA, and the capacity at rate B is CB then:
exponent = [log (B/A)/log
tomw via EV wrote:
I did a graph of gc battery capacity versus discharge current using the
Peukert equation a number of years ago using the 20 hr and 10 or 5 hr rates.
It gave these capacities at 100A discharge current:
T145 (6V, 260Ah): 188Ah
T125 (6V, 240Ah): 165Ah
T105 (6V, 225Ah): 164Ah
I did a graph of gc battery capacity versus discharge current using the
Peukert equation a number of years ago using the 20 hr and 10 or 5 hr rates.
It gave these capacities at 100A discharge current:
T145 (6V, 260Ah): 188Ah
T125 (6V, 240Ah): 165Ah
T105 (6V, 225Ah): 164Ah
T1275 (12V, 150Ah):
On 28 Jul 2015 at 6:30, Willie2 via EV wrote:
The longevity of ebike batteries is a BIG unknown here.
One thing to watch out for is that (according to what I read on Endless
Sphere) some of the really cheap Chinese bike batteries are made with
recycled (used) laptop cells.
I don't know how
You're comparing apples and oranges.
- six T105s would be about $900.
- 12 TS-LPF100s: about $1500 + $300 BMS
- five 20ah ebike batteries @ $285. Total: $1425.
- Experience... indicates two 20ah ebike batteries can do ($570.)
Then also instead of six Trojans, 3 deep cycle 12v Lead batteries
On 07/27/2015 06:08 PM, Lee Hart via EV wrote:
Willie2 via EV wrote:
Thanks! Bottom line, take away: 50-90 ah on a fresh lead pack.
It's not quite that bad. The Peukert effect does not change the ACTUAL
capacity; it only describes the APPARENT capacity due to high
currents. If you have a
On 07/28/2015 06:30 AM, Willie2 wrote:
Compare to 5 20ah ebike batteries @ $285. Total: $1425. Experience so
far indicates as few as 2 20ah ebike batteries can be used at a cost
of $570.
Just checked Ping batteries, with an established good reputation:
Willie2 via EV wrote:
Somewhat against my will, I just did some lead battery shopping. T105s
are about $150. The minutes at 75 amps rating seems most appropriate.
That would be just under 100 ah. From what you say, it appears those are
usable amphours. SAMs batteries, with presumably less
You're comparing apples and oranges.
Well, Robert, how so? I presented three golf cart packs,
each offering about 100ah of usable capacity. Where did I go astray?
The apples were 100 Ah comparisons. Then you changed to 40 Ah oranges,
without going back and putting the apples on the same
On 07/28/2015 12:00 PM, Lee Hart via EV wrote:
So the T105 is $150/(6v x 75a x 1.75hr) = $0.19/wh.
The Sam's Club is $80/(6v x 75a x 1.75hr) = $0.10/wh.
I didn't check SAMs' battery claims. I had assumed less capacity than
T105s.
I'm not sure what your all or nothing replacement means. You
On 07/28/2015 07:41 AM, Robert Bruninga via EV wrote:
You're comparing apples and oranges.
Well, Robert, how so? I presented three golf cart packs, each offering
about 100ah of usable capacity. Where did I go astray?
- six T105s would be about $900.
- 12 TS-LPF100s: about $1500 + $300 BMS
-
Sent: Tuesday, July 28, 2015 11:00 AM
Subject: Re: [EVDL] Lead GC battery capacity
Willie2 via EV wrote:
Somewhat against my will, I just did some lead battery shopping. T105s
are about $150. The minutes at 75 amps rating seems most appropriate.
That would be just under 100 ah. From what you
Willie2 via EV wrote:
Thanks! Bottom line, take away: 50-90 ah on a fresh lead pack.
It's not quite that bad. The Peukert effect does not change the ACTUAL
capacity; it only describes the APPARENT capacity due to high currents.
If you have a 200ah battery and discharge it at 100 amps so it
Continuing to cogitate on ebike batteries: can anyone give me a good
estimate of the number of ah one can pull from a lead golf cart
battery? I'm thinking my 2 20ah ebike batteries are a pretty good
fraction of a lead pack. Can you keep a lead GC battery alive if you
pull 100ah from it?
-BEGIN PGP SIGNED MESSAGE-
Hash: SHA1
If you are using GC2 style 6 volt golf cart batteries, they are
usually rated in minutes of 75 amp draw (Mine are 107 minutes).
They are rated at 208 AH (if you draw them down over 20 hourswhich
is unrealistic) and can probably deliver 110 or so
Private: http://www.cvandewater.info
Skype: cor_van_de_water XoIP: +31877841130
Tel: +1 408 383 7626Tel: +91 (040)23117400 x203
-Original Message-
From: EV on behalf of Willie2 via EV
Sent: Sat 7/25/2015 12:11 PM
To: Electric Vehicle Discussion List
Subject: [EVDL] Lead GC battery
On 07/25/2015 03:25 PM, Lee Hart wrote:
From: Willie2 via EV ev@lists.evdl.org
Continuing to cogitate on ebike batteries: can anyone give me a good
estimate of the number of ah one can pull from a lead golf cart
battery? I'm thinking my 2 20ah ebike batteries are a pretty good
fraction of a
From: Willie2 via EV ev@lists.evdl.org
Continuing to cogitate on ebike batteries: can anyone give me a good
estimate of the number of ah one can pull from a lead golf cart
battery? I'm thinking my 2 20ah ebike batteries are a pretty good
fraction of a lead pack. Can you keep a lead GC
On 25 Jul 2015 at 14:11, Willie2 via EV wrote:
can anyone give me a good estimate of the number of ah one can pull
from a lead golf cart battery?
It depends on current, but usually the reserve capacity is a good rough
estimate in normal golf car use. For example, a T105 type battery with a
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