[RE-wrenches] Solar One HUP batteries

[Ray Walters]

We were a distributor for the HUP Solar One for almost 2 decades.  
Enersys, the parent company, decided to pull the plug on the entire HUP 
line, due to reduced demand for lead acid batteries, and then the 2025 
Tariffs were the final blow. We were told to pull all advertising, and 
mention of what was a great battery.  I don't know what to say about a 
replacement cell, other than to contact Enersys directly and try to work 
through the chain of command.

Tommy retired with that, so is no longer a contact point, and I really 
don't have anything to offer either.  A bad cell is highly unusual with 
the HUPs, I only saw that on a system where the owners were not able to 
get to one of the cells, and so it went dry.  I've recovered cells by 
charging them vigorously with a large automotive charger set to 6 v, and 
just put that across the terminals of the individual cell while charging 
the whole system as well.

Also, the HUPs need a pretty high charge rate to bring the cells to full 
SG. Depends on the model, but the minimum charge rate can be as high as 
200 amps for the largest model.  I've attached a spec sheet with minimum 
charge rates listed.  Basically if you aren't getting close to those 
charge rates, you can end up with sulfation damage long term.  I've 
almost always been able to recover HUPs, but it might take 2 days of 
EQing at very high voltages (62 v @ 48v nominal) nothing will happen, 
and then finally the SG will start moving.

Ray Walters
Remote Solar

On 6/17/2026 11:59 AM, Dana Orzel via RE-wrenches wrote:
>
> Chris I am on the Solar One If no reply let em know I can dive into my 
> battery box & look at ID & Data
>
> _________________________________________________________
>
> Dana Orzel GREAT SOLAR WORKS!
>
> C – 208.721.7003      E – dana at solarwork.com <mailto:dana at solarwork.com>
>
> W - www. greatsolarworks.com www.solarwork.com <http://www.solarwork.com/>
>
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