Ian Woofenden wrote:
This is one of my pet peeves too...
A few snippets and observations from my frequently given electrical
terms presentation:
If I asked you "How far is it to Vancouver?" and you answered "45
miles per hour," everyone listening would know that someone was
confused. But w
Drake,
The spreadsheet name was Peukert.xls and all it computed was the
Peukert effect - greater discharge current <-> smaller battery
capacity. Peukert's equation is based on a constant discharge current
from fully charged to fully discharged (10.5 volts at the current in
question). The mis
This is one of my pet peeves too...
A few snippets and observations from my frequently given electrical
terms presentation:
If I asked you "How far is it to Vancouver?" and you answered "45
miles per hour," everyone listening would know that someone was
confused. But we tolerate and even pe
At 09:34 -0800 19/1/10, Kent Osterberg wrote:
The Peukert capacity equation gives a "pretty good" estimate of the
total amphours available at the present discharge current,
regardless of what the discharge current was in the past.
In other words it tells you the 'capacity' at a particular lo
Kent,
At 12:34 PM 1/19/2010, you wrote:
In the tests performed by Dennis Doerffel and Suleiman Abu Sharkh it
is was in the five to ten percent range.
In the first Excel spreadsheet, posted by Julie Haugh, the loss rates
seem a lot higher than five to ten percent. Using 220 AH battery,
for e
Drake,
I'll re-word this in an attempt at precision.
The Peukert capacity equation gives a "pretty good" estimate of the
total amphours available at the present discharge current, regardless
of what the discharge current was in the past. That is equivalent to
saying: The amphours that a batte
This is a very interesting thread.
A lot has been said. What I think I understand is that if a battery
is discharged completely at a high discharge rate, a significant
number of amp hours will be lost due to heat and inefficiency, and
Peukert's equation will approximate the loss. If the disc
Thanks Hugh and all who contributed to this thread. It has been most
educational. Since a battery plate will dissolve in water it seems that there
should be a min voltage under fast discharge that should be avoided.
The loss of SOC accuracy comes from charging and watching the voltage while
Re: [RE-wrenches] Capacity loss due to rapid dischargeThat is not quite true.
Some of the loss is in heat due to internal resistance, and that cannot be
recovered. High discharge rates also significantly affect overall battery life,
which is not part of the equation but must be considered.
Thanks, Kent,
It is clear then that high discharge rates have a big effect on the
voltage, but only a small effect on the actual battery capacity.
That was my instinct but it's good to have it confirmed. And this
will be important information for those who use Peukert's Law
'naively' to con
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