This is re: Lithium batteries, which cannot be charged if the battery
temperature is less than zero C without risking battery failure. It
sounds like a pretty dire failure mode from what I read. No voltage
compensation. Only battery temperature adjustment. The Tesla does it
with a water circulation system, don't know what the volt uses.
On 1/21/19 1:06 PM, Ken Hohhof wrote:
I believe car voltage regulators have temperature compensation. They
adjust the alternator voltage by driving the field coil, to produce a
voltage based on temperature. I think some high end cars may even
have the temperature sensor right at the battery. Years and years
ago, maybe even in the generator days, it was advised to turn your
headlights on in cold weather, to avoid overcharging your battery or
something.
*From:* AF <[email protected]> *On Behalf Of *Robert
*Sent:* Monday, January 21, 2019 2:36 PM
*To:* [email protected]
*Subject:* Re: [AFMUG] Front Mount Telecom batteries
I would be really surprised if it did not have temperature regulation
on the battery. They can discharge below zero but not charge, so, at
least on the tesla, it will save battery to warm itself before
charging when plugged in.
On 1/21/19 11:54 AM, [email protected] <mailto:[email protected]> wrote:
I wonder how my car does it. It does not have battery heaters but
I have had plenty of 0F days lately and it charged.
*From:*Robert
*Sent:*Monday, January 21, 2019 12:36 PM
*To:*[email protected] <mailto:[email protected]>
*Subject:*Re: [AFMUG] Front Mount Telecom batteries
I agree with all this but I will put in one more MAJOR con.. You
cannot charge Lithium if the battery is at or below freezing.
Hocus Pocus No No... Battery must be above 0 degrees C. If I
could guarantee that in my configurations I would bite the price
bullet in a second.
On 1/21/19 11:23 AM, Adam Moffett wrote:
Pros:
Compared to lead-acid, Lithium gives you about 3x the energy
per unit of mass, and about 5x the energy per unit of volume.
Lithium has more endurance for charge/discharge cycles than
lead-acid.
Cons:
Lithium costs 5x more per unit of energy than lead-acid.
Many industrial and telecom chargers don't support Lithium,
you have to check each time whereas you can assume they
support lead-acid.
I also wonder if higher energy density means greater risk of
thermal overrun.
If you're going to be discharging frequently and have size and
weight limitations (like mobile devices) then Lithium makes
perfect sense. As a backup battery I don't see any advantages
that actually matter to me. It only discharges during a power
outage, and I'm usually more sensitive to cost than to size
and weight.
YMMV
On 1/19/2019 4:41 AM, TJ Trout wrote:
Anyone using lithium batteries?
On Sat, Jan 19, 2019, 1:35 AM TJ Trout <[email protected] wrote:
Looking for 48v string about 100ah in a 19in rack,
usually use 100ft red from Northstar but looking for
alternatives.
What brand of rack are you guys using and what types
of batteries?
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