In addition to water bed heaters, check out the solid material plant
heaters.
Another possibility is the Farnham silicon rubber heaters:
https://farnam-custom.com/custom/silicone-rubber-heaters?gclid=CjwKCAiAyc2BBhAaEiwA44-wW3g97mUaxRnzV1dviqMC0VTzI_2gHVKlrztQheItKcRWvAh9dTr50RoCOZUQAvD_BwE
Regardless of what you choose to use, be sure that the product is solid,
can handle lots of vibration, and fails gracefully.
Best of luck!
On 2/22/21 4:47 PM, Thos True via EV wrote:
Hi Nathan,
Back in the days of lead-acid, we used water bed heaters under the
batteries to get them to an optimal temp for charging and discharging
(about 100 degrees F). I'm thinking that you are looking to keep your pack
more in the area of 50 degrees, but I expect that the same method would
work for you.
-Tom
On Mon, Feb 22, 2021 at 4:27 PM nathan christiansn via EV <ev@lists.evdl.org>
wrote:
Hi all,
I live in northern utah, and it can get fairly cold here in the
winter(close to 20 fahrenheit in the night)
I am using nissan leaf batteries in my Geo Metro EV conversion. The leaf
batteries, as with most other lithium batteries, is not supposed to be
charged below 32 degrees fahrenheit.
I am worried that I will not be able to charge my EV during the winter
because of the cold outside temperatures. I also do not currently have
access to a heated garage.
I am considering adding a battery heater. I was thinking of attaching one
of those silicone heating pads that are used as ICE block heaters to
the bottom of my 2 steel battery boxes, but I was wondering if anyone had
any better ideas?
Nathan
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