โDec-17-2021 05:32 AM
โDec-21-2021 05:35 PM
โDec-21-2021 12:25 PM
3 tons wrote:
Thanks for relating to us your sage experience and appropriate safety cavetโฆThough I believe that LFPโs are considerably safer than higher power density phone batteries (likely because of LFPโs lacking cobalt chemistry) thereโs little doubt that lithium types are a different animalโฆ When doing a true load test on my replacement 200a/h LFP cylindrical-cell drop-in, I was made acutely aware of this when once โconfirmedโ to be at zero percent rated SOC, I decided to switch on the microwave oven to see what might happen and was amazed that it ran perfectly while drawing a whopping 136 (or slightly more) d.c. amps at zero SOC!! - CRAZY!! Turns out that this battery didnโt come to a stop until at 215 consumed a/hrsโฆFWIW, I have no idea whether this is typical of other drop-ins (??), but YES an altogether different kind of animal indeedโฆ
3 tons
โDec-21-2021 12:08 PM
โDec-21-2021 10:55 AM
3 tons wrote:
ANY Battery can be defective, or prematurely die a natural death, but at least with LFPโs some come with a ten (or even 11year) warrantyโฆ.I admit this is purely anecdotal, but when my comparatively pricy 18 mo old single 200a/h LFP for some reason developed a premature shut-down at 20% SOC, it was simply replaced under warranty with no questions askedโฆI load tested the replacement and itโs actual capacity was at 215a/hrsโฆ.Bottom line is thereโs just no certainties in life, but reputation often matters - โyou just gotta pick your own poisonโ - lol
3 tons
โDec-20-2021 06:10 PM
โDec-18-2021 01:31 PM
wa8yxm wrote:Gdetrailer wrote:
I have a bunch of UPS units around my house, they all came equipped with AGM instead of Gel cells, life of AGMs in "standby use" is far shorter than Gel cells. Older UPS units which came with Gelcells battery life was 5-6 yrs, the newer units equipped with AGMs I end up changing out 2-3 yrs..
I have used both AGM and GEL and I've seen others
Gel is the finikiest eater of any battery out there. You need to be very very very careful charging them.. AGM's on the other hand are gluttons. you can feed them fast enough to "Choke a horse"
(From Xantrex and Lifeline,
Regular Lead acid should be charged 0.30C or slower (C is capacity in amp hours at the 20 hour rate so a 100 amp hour battery eats no more than 30 amps)
Gel 0.25C
Agm.. over 0.2 C used to be 0.3 C but they lowered it And top charge rate easily 2x the minimum (Note with AGM we changed from MAX to MIN charge rate)
I've seen AGM's go 12 years.. I've had 'em last 5, I've never had a gel make it to 2 ANd that was in a system specifically designed to use GEL batteries.
โDec-18-2021 02:55 AM
Gdetrailer wrote:
I have a bunch of UPS units around my house, they all came equipped with AGM instead of Gel cells, life of AGMs in "standby use" is far shorter than Gel cells. Older UPS units which came with Gelcells battery life was 5-6 yrs, the newer units equipped with AGMs I end up changing out 2-3 yrs..
โDec-17-2021 10:17 PM
Gdetrailer wrote:
I have a bunch of UPS units around my house, they all came equipped with AGM instead of Gel cells, life of AGMs in "standby use" is far shorter than Gel cells. Older UPS units which came with Gelcells battery life was 5-6 yrs, the newer units equipped with AGMs I end up changing out 2-3 yrs..
Gets downright expensive after a while replacing AGMs.. So much so, have considered dumping the standalone UPS units, adding a dedicated Triplite APS series inverter/charger and yes, a pair of 6V FLA GC2s.. I can setup the GC2s/inverter/charger in a separate garage where my whole house gen lives and run inverter only power back to a couple of dedicated outlets.. Instead of needing to replace $60-$100 worth of AGMs every 2-3 yrs I would now have 10+ yrs of battery life.
Call me cheap, but dang those little wimpy AGMs hurt the wallet.
โDec-17-2021 04:45 PM
โDec-17-2021 03:02 PM
โDec-17-2021 01:52 PM
pianotuna wrote:
~DJ~ so long as the batteries are charged it is better for them to be cold. It slows down self discharge about 50% for every 18 F (10 C) the ambient temperature drops.
Gdetrailer AGM do about six times better than FLA in the cold.
โDec-17-2021 12:34 PM
โDec-17-2021 11:51 AM
theoldwizard1 wrote:gbopp wrote:
You may want to remove the batteries at some point and inspect any metal near them for rust. Sand and paint as needed.
Just keep them charged while in storage.
Besides sanding and painting any brackets, keep the battery itself clean. Baking soda and water and an old paint/chip brush. Rinse with lots of fresh water.
โDec-17-2021 11:24 AM
gbopp wrote:
You may want to remove the batteries at some point and inspect any metal near them for rust. Sand and paint as needed.
Just keep them charged while in storage.