S Collins wrote:
> p.s. Please chime in if my numbers are off...
Since the Firefly is still vapourware, it is difficult to say which of
your numbers may be off and by how much.
One of Firefly's statements has been that they *expect* their battery to
cost about 2x the $/kWh as present AGMs, which I think is more than "a
little more" than other lead acid ;^>.
I look forward to actual Firefly product being available for testing so
we can see just how well it does.
Cheers,
Roger.
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S Collins wrote:
>... and seem to be around 63 lbs each and ratings
>around 100Ah (+/-).
>
>On the otherhand, Firefly's version should be much
>lighter (70% less lead) and have a higher aH rating
>(like 50% more, e.g. around 150Ah?).
>
>So, for a 120v EV, 10 of today's group 31 batts
>typically would be 630lbs and like a 30-40 mile range
>(120v x 100Ah = 12000Wh. At 300Wh/mile, about 40
>miles).
>
>So, with Firefly, about 60 mile range and assuming 60
>of the 63 lbs of a regular batt is the lead, FF would
>be about about 21 lbs each x 10 equals just 210 lbs.
>
>And it still retains 90% of charge capability after
>over 3 times the normal cycles of today's batts.
>
>Sounds too good to be true... supposedly the price
>should be just a little above today's lead-acid
>equivalent.
>
>I'm lickin' my chops and waiting to see if they come
>out next year and how much they'll be.
>
>Scott
>
>p.s. Please chime in if my numbers are off...
>
>
>
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R. Matt Milliron wrote:
> >Can anyone say with any authority whether these "trucker"
> >batteries would even be suitable for EV use?
>
> No authority but, this is what I have in my car. After sitting for
> two years they are coming back nicely. We'll see.
Just to be clear, you are not stating that you have had a set of these
specific (Firefly group31) batteries sitting in your car for 2 years,
but rather that you have *some* sort of group 31 *size* batteries in
there, right?
Just to be one step clearer, "group 31" refers to a specific standard
physical battery case size, and tells almost nothing about the capacity
or nature of the specific battery. Group 31 batteries are available in
gel, AGM, and flooded lead acid varieties, each of which has different
usable capacity and power/max current capability, etc.
I think the question here is suggesting that the battery that Firefly
produces will target the particular demands of this "trucker"
application, and may not be any more suitable for the rigours of EV use
than are (for instance) batteries intended for trolling motor
applications, even though both may be group 31 size.
Cheers,
Roger.
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you wrote:
>R. Matt Milliron wrote:
>
>> >Can anyone say with any authority whether these "trucker"
>> >batteries would even be suitable for EV use?
>>
>> No authority but, this is what I have in my car. After sitting for
>> two years they are coming back nicely. We'll see.
>
>Just to be clear, you are not stating that you have had a set of these
>specific (Firefly group31) batteries sitting in your car for 2 years,
>but rather that you have *some* sort of group 31 *size* batteries in
>there, right?
Yes.
>
>Just to be one step clearer, "group 31" refers to a specific standard
>physical battery case size, and tells almost nothing about the capacity
>or nature of the specific battery. Group 31 batteries are available in
>gel, AGM, and flooded lead acid varieties, each of which has different
>usable capacity and power/max current capability, etc.
I have 10, Generic, group 31, flooded lead, deep cycle batteries.
>I think the question here is suggesting that the battery that Firefly
>produces will target the particular demands of this "trucker"
>application, and may not be any more suitable for the rigours of EV use
>than are (for instance) batteries intended for trolling motor
>applications, even though both may be group 31 size.
If they are anything like what they advertise, I want some.
R. M. Milliron
1981 Jet Electrica
http://www.austinev.org/evalbum/702
This machine has been garaged for 17 years.
I am upgrading it and getting it running. Tabitha,
my daughter, named it, "Pikachu". It's yellow and black,
electric and contains Japanese parts, so I went with it.
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