[RE-wrenches] Fwd: Need battery advise want to float batteries

[Steve Higgins]

Darryl,

It sounds like you need a new set of calcium based batteries, or LFP
batteries, if they can afford them.

Remember Lead Antimony batteries want to cycle, calcium batteries, can sit
in float for years...Even so, I still like to cycle Lead-Calcium at least
3-4 times a year...  If you use a Lead Antimony battery in a backup
application, it's a good idea to cycle them 15-30% at least once a month.

17 years is a bit aged for AGM batteries, after 10-12 years, since they are
starved electrolyte batteries they tend to dry out, this will cause severe
loss of capacity.


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On Mon, Feb 18, 2019 at 6:50 AM Darryl Thayer <darylsolar1 at gmail.com> wrote:

> My customer had C&D 600 AH 24 volt 7 kWh @ 50% DOD.  AGM style, for a
> backup system.  After 17 years when the power went out at 23 below.
> batteries were warm.  They delivered only 1.5 kWh before going below 22
> volts.  The customer wants a similar or better set.  On Float all the
> time.  Trojan says they are not the battery, to little cycling.  Who?
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