[RE-wrenches] for all you Aquion installers

[Darryl Thayer]

Since the cells stack in series the low voltage cell must be discharged.
they are under compression, However If they are disconnected and charged
separately perhaps they can be brought back.  Are these batteries used in
frequent cycles or just backup power?   Lead Acid depends upon overcharge
immunity, thee may not have that.  If they are not overcharging the good
cells the weak cells will continue to discharge until the battery has some
very weak cells.

On Tue, Jan 30, 2018 at 9:42 AM, Tom Duffy <Tom at solar-biz.com> wrote:

> We have a situation with a customer's Aquion (Understand there's now
> longer a warranty) I spent some hours looking at the Aquions. I tested the
> voltage of each cell. 4 out of the 6 stacks  had a cell that was low, in
> the range of 0, 3, 4, volts, while all the rest were above 6.
>
> Each of the cells has a test point above the connector. The cells that
> were low each have corrosion on the positive terminal, such as you see in
> the photo. Any ideas as to what is causing this? Has anyone seen this
> before?
>
>
> Kind regards
>
> Tom Duffy
> Senior Solar Design Engineer
>
>
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