[RE-wrenches] AGMs - Maintenance Cycling

[Mark Frye]

Thanks Guys,

I guess I am wondering if the overall life of the battery will suffer if it is only ever cycled between 0 and 20% DOD and never deep cycled.


From: RE-wrenches <re-wrenches-bounces at lists.re-wrenches.org<mailto:re-wrenches-bounces at lists.re-wrenches.org>> On Behalf Of Jay via RE-wrenches
Sent: Monday, December 1, 2025 3:31 PM
To: RE-wrenches <re-wrenches at lists.re-wrenches.org<mailto:re-wrenches at lists.re-wrenches.org>>
Cc: Jay <jay.peltz at gmail.com<mailto:jay.peltz at gmail.com>>
Subject: Re: [RE-wrenches] AGMs - Maintenance Cycling

Agreed and especially if the batteries are in a cooler to cold environment even less an issue as the colder temps slows down any self discharge

Jay

On Dec 1, 2025, at 12:57 PM, James Jarvis via RE-wrenches <re-wrenches at lists.re-wrenches.org<mailto:re-wrenches at lists.re-wrenches.org>> wrote:

Is there a specific problem you are trying to resolve? If the loads are shut off when in storage, I don't see any issue with not messing with any charging what-so-ever for some months of storage.

-James Jefferson Jarvis
APRS World, LLC
+1-507-454-2727
http://www.aprsworld.com/


On Mon, Dec 1, 2025 at 10:47 AM Mark Frye via RE-wrenches <re-wrenches at lists.re-wrenches.org<mailto:re-wrenches at lists.re-wrenches.org>> wrote:
Folks,

I have some AGMs that are PV charged during normal use and can be line charged when in storage (IOTA).

The batteries will generally see 10-20% daily DOD and will generally complete the absorb cycle and see a fair amount of float each day.

They may be deployed in this mode for many months.

After that, they will go into storage for several months.

Storage will include float charging at the IOTAs regular voltage.

I have the LVD set at 46V.

Would it make sense to occasionally turn on the load, turn off the line charger, let the bank run down to LVD, turn off the load, turn on the charger with the increased voltage jumper installed, charge overnight, remove jumper and resume normal float charging?

Thanks,

Mark


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