[RE-wrenches] 2v battery charger

[frenergy]

Jay,

             You caught me at a "good" time as I have 2, 2 volt 1788 Ahr 
batteries failing.  This is the third and fourth (EXPENSIVE) cell I may 
have to replace in this 48 volt pack in just 9 years, I was expecting 
twice the life.

             Anyway, there is a variety of ways to discover cells that 
are failing but the way I usually find them is watching SGs. A month or 
so ago I noticed these two cells not keeping up with the rest of the 
pack so of course I bumped up voltage and time, equalized, prayed, 
swore....nothing worked, they would not come back.  When this happened 
in the past I actually built a "2 volt" solar panel that had a Voc of 
about 3.5 volts and amps at about 8, which didn't work out I think 
partly because to do what has to be done power has to be applied 24/7 
for days.

             So my latest is this: 
https://www.amazon.com/Converter-DROK-Adjustable-Regulator-Transformer/dp/B08LPVWX74/ref=pd_sbs_2/147-8705530-5096213?pd_rd_w=0WaS8&pf_rd_p=0a3ad226-8a77-4898-9a99-63ffeb1aef90&pf_rd_r=VMM54F7M6J97FKVG1YTX&pd_rd_r=4ab68b46-8cc1-42b0-8a6e-720dd301e136&pd_rd_wg=6t80O&pd_rd_i=B08LPVWX74&psc=1

             for the input side I used a couple 12 volt/50 Ahr AGMs 
which I would switch out and charge back up twice a day to keep the 
boost going to the 2V cell.  It took about 4-5-6 days but I got the SGs 
back up to 1.260 on both cells.  I kept the cells in service during this 
process, but may have been quicker if I pulled them out one at a time 
though the pack was not being pulled down below 80% SOC for 2 of these 
days during this 'boost' period.  I'm not sure if this is going to work 
as the SGs may drift back down. If it was sulphation, it may work.  If 
it is something else, I may be going to L-ion.

Bill

Feather River Solar Electric
Bill Battagin, Owner
4291 Nelson St.
Taylorsville, CA 95983
530.284.7849
CA Lic 874049

solar powered since 1982


On 1/20/2022 4:35 PM, Jay wrote:
> Hi all
>
> What recommendations do folks have for a 2v battery charger.
> It’s for 2v lead acid cells, preferably looking for something that’s adjustable to the specific battery chemistry.
>
> Higher amps also preferred as the 2v cells are usually pretty large. 10 amps would work but higher probably better
>
> I’ve looked around but haven’t found anything.
>
> Thanks
>
> Jay
>
>
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