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 <ev@lists.evdl.org>
To: via EV <ev@lists.evdl.org>
Cc: fred <fred_do...@yahoo.com>
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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