leaf versus volt battery modules continued

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leaf versus volt battery modules continued

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Thanks for the responses. I now have an email contact, but am posting this portion here as I believe it has value as general knowledge. Jerry, if you can offer prices for either module, please pop an email to me. I will be able to arrange pickup by a friend who lives in Orlando and works in Naples, passing minutes away from your location.
Using eBay as a reference, I've found a low-cost Leaf module, $75 for 43 ah at 7.6v. I need a minimum of 48 volts, which would be 7 modules, bringing the total including shipping to $665.
Volt modules are listing $245 for 45 ah but at only 45v nominal. I can't expect that it's an easy matter to add a single cell or cell bundle to get closer to 48v or slightly higher. I probably can use the 45v because the chemistry suffers little from Peukert effect and the low voltage cut-out is somewhere around 42v, I believe. With shipping, the total is $270, less than half the Leaf bundle.
Allowing for what I've learned from Jerry's posts, I'd end up with two Leaf modules and I think his prices were better. That means other than the lower voltage, I'd come out ahead with the Volt bundle compared to the Leaf.
If my math is incorrect or appears to be based on something unrealistic, please let me know.
The mower draws a max of 40 amperes and that's not very frequently. It runs steadily at about 20-24 amperes. I'm inclined to believe this means I won't be overheating the pack, regardless of my selection. By the same token, charging would be done with a chemistry specific charger at about 6 amperes. Even though the Volt packs can be/are liquid cooled, I believe that I won't need active cooling at such a low rate. Again, please correct any misconceptions you see.
fred
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Re: leaf versus volt battery modules continued

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        Hi Fred and All,                Volt modules are such that the smallest is 4 kwh, 2 sets of 48vdc that is neither easy to put back together  or good to take apart.                A well regulated power supply that can be set at 49.5vdc can charge them.                You math is correct the 4wth Volt module is $600 so cheaper and about 2x the Kwh.The voltage is very stiff in the Volt so it only drops .5-.8vdc  and no Peukert effect I've been able to tell.                Picking up is always good as saves shipping and crating.                       Thanks,                              Jerry Dycus

      From: fred via EV <[hidden email]>
 To: via EV <[hidden email]>
Cc: fred <[hidden email]>
 Sent: Wednesday, December 13, 2017 6:24 PM
 Subject: [EVDL] leaf versus volt battery modules continued
 
Thanks for the responses. I now have an email contact, but am posting this portion here as I believe it has value as general knowledge. Jerry, if you can offer prices for either module, please pop an email to me. I will be able to arrange pickup by a friend who lives in Orlando and works in Naples, passing minutes away from your location.
Using eBay as a reference, I've found a low-cost Leaf module, $75 for 43 ah at 7.6v. I need a minimum of 48 volts, which would be 7 modules, bringing the total including shipping to $665.
Volt modules are listing $245 for 45 ah but at only 45v nominal. I can't expect that it's an easy matter to add a single cell or cell bundle to get closer to 48v or slightly higher. I probably can use the 45v because the chemistry suffers little from Peukert effect and the low voltage cut-out is somewhere around 42v, I believe. With shipping, the total is $270, less than half the Leaf bundle.
Allowing for what I've learned from Jerry's posts, I'd end up with two Leaf modules and I think his prices were better. That means other than the lower voltage, I'd come out ahead with the Volt bundle compared to the Leaf.
If my math is incorrect or appears to be based on something unrealistic, please let me know.
The mower draws a max of 40 amperes and that's not very frequently. It runs steadily at about 20-24 amperes. I'm inclined to believe this means I won't be overheating the pack, regardless of my selection. By the same token, charging would be done with a chemistry specific charger at about 6 amperes. Even though the Volt packs can be/are liquid cooled, I believe that I won't need active cooling at such a low rate. Again, please correct any misconceptions you see.
fred
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