Re: [EVDL] Winter & EVs
Re: [EVDL] Winter & EVs
Hello Hunter,
You will still have to insulated them, because the minimum temperature they
can withstand is -4 F. I use to work on NiCad's and they not worth the
trouble in preventive maintenance that should be done about once a month.
In running a aircraft battery shop, I broke down these batteries done every
30 days, discharge them to 0 volts, added new KOH electrolyte, charge them
to 1.21 volt (cannot overcharge them at all, tested them and install them
into silicon insulated cases, connected all the links and put back in
service.
These were only 10 ah cells at the time and good for about 500 cycles. I
have calculated that to replace my 300 ah lead cobalt cells, that I would
need 170 of these cells per string and 30 strings which would be a total of
5100 cells which would be as bad as the Tesla batteries.
With the 300 AH at 204 cells, I could go up a 7 percent grade hill at 60 mph
for about 2 miles which will draw about 400 battery amps and 600 motor amps.
I could make four runs or run four days for about 25 miles before the
batteries would get to 50% DOD.
The advanced life cycle of the cobalt cell is about 800 cycles so this is
about a average of 800 weeks or 15 years. I replace them in 10 years with a
Exide X220 6 volt battery which also got me 10 years, but did not have to
drive up that long hill any more.
Roland
----- Original Message -----
From: "Hunter Cook" <[email protected]>
To: "Electric Vehicle Discussion List" <[email protected]>
Sent: Monday, September 24, 2007 9:53 AM
Subject: Re: [EVDL] Winter & EVs
> Hi everybody-
>
> Not to take anything away from the various battery heating/insulating
> projects, but why not just use a NiCd pack? Just seems like less
> trouble, and as a bonus they'd last way longer than lead acid and be a
> lot cheaper than Li-ion.
>
> Just a thought...
>
> Hunter.
>
>
Hello Hunter,
You will still have to insulated them, because the minimum temperature they
can withstand is -4 F. I use to work on NiCad's and they not worth the
trouble in preventive maintenance that should be done about once a month.
In running a aircraft battery shop, I broke down these batteries done every
30 days, discharge them to 0 volts, added new KOH electrolyte, charge them
to 1.21 volt (cannot overcharge them at all, tested them and install them
into silicon insulated cases, connected all the links and put back in
service.
These were only 10 ah cells at the time and good for about 500 cycles. I
have calculated that to replace my 300 ah lead cobalt cells, that I would
need 170 of these cells per string and 30 strings which would be a total of
5100 cells which would be as bad as the Tesla batteries.
With the 300 AH at 204 cells, I could go up a 7 percent grade hill at 60 mph
for about 2 miles which will draw about 400 battery amps and 600 motor amps.
I could make four runs or run four days for about 25 miles before the
batteries would get to 50% DOD.
The advanced life cycle of the cobalt cell is about 800 cycles so this is
about a average of 800 weeks or 15 years. I replace them in 10 years with a
Exide X220 6 volt battery which also got me 10 years, but did not have to
drive up that long hill any more.
Roland
----- Original Message -----
From: "Hunter Cook" <[email protected]>
To: "Electric Vehicle Discussion List" <[email protected]>
Sent: Monday, September 24, 2007 9:53 AM
Subject: Re: [EVDL] Winter & EVs
> Hi everybody-
>
> Not to take anything away from the various battery heating/insulating
> projects, but why not just use a NiCd pack? Just seems like less
> trouble, and as a bonus they'd last way longer than lead acid and be a
> lot cheaper than Li-ion.
>
> Just a thought...
>
> Hunter.
>
>
