On 5/22/2014 6:52 AM, Jim Lynch wrote:
On 05/21/2014 04:21 PM, Ron Frazier (TECHC) wrote:
For Lead Acid / Sealed Lead Acid:
- Doesn't have a memory effect in the traditional sense. Deep cycles
help kill the battery (slowly).
It's my understanding (and experience) depleting a lead acid battery
below 50% charge repeatedly will significantly reduce it's life. Bring
it down to 0% a couple of times and you don't have much of a battery
left. To extend the life of a LA battery don't discharge below 60%.
Also be careful charging sealed LA batteries, they can't take a fast
charge like the vented kind.
Jim.
Hi Jim,
You make a very good point. Thanks. I found the following information
which corroborates what you said. Apparently, deep cycle batteries
tolerate deep cycles but still don't like them. Apparently, starter
batteries REALLY don't like deep cycles. Neither type likes being stored
at low charge.
I found this table, which explains lead acid battery life:
Depth of Discharge Starter Battery Deep-cycle Battery
100% 12–15 cycles 150–200 cycles
50% 100–120 cycles 400–500 cycles
30% 130–150 cycles 1,000 and more cycles
Here is some good info:
http://batteryuniversity.com/learn/article/lead_based_batteries
http://batteryuniversity.com/learn/article/how_to_restore_and_prolong_lead_acid_batteries
http://batteryuniversity.com/learn/article/charging_the_lead_acid_battery
I'm not sure where ups batteries, hand held spotlight batteries, and
security system batteries fit in the spectrum between starter and
deep-cycle. You'd think they'd be designed for deep cycling. But, I
guess it's better not to drain them if you don't have to.
I still think it's a good idea to test ups's occasionally to make sure
you're getting the runtime you need, but I may have to do more research
on that.
Sincerely,
Ron
--
(PS - If you email me and don't get a quick response, you might want to
call on the phone. I get about 300 emails per day from alternate energy
mailing lists and such. I don't always see new email messages very quickly.)
Ron Frazier
770-205-9422 (O) Leave a message.
linuxdude AT techstarship.com
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