[RE-wrenches] Solar One HUP batteries

Wed Jun 17 15:07:32 PDT 2026

I kind of saw the writing on the wall a few years back. The incumbent
installer for all the off-grid islands around me installed dozens of HUP
systems over the last 5 years. Now he is gone, and I am actively removing
them and installing LFPs. Most of them have been abused, so they're
6,000-pound bricks in elevated equipment buildings at very remote sites.
Not fun.

As much as I loved these batteries for some early off-grid jobs I did, the
modularity, expandability, lack of maintenance, monitoring insight, and
weight of LFP is too much to ignore. Not perfect, for sure, but overall
it's better for my situation.

Incidentally, I think Tommy lived about 30 minutes away from me, in
Placida, FL, near Boca Grande. I seem to recall picking up a HUP battery
bank at his shop for my father's house in the Caribbean about a decade ago.
Seems like yesterday, but also a million years ago in some ways! I just
removed a battery from an island that I bought from him in 2010, but it had
already been replaced a few years back and was just waiting for a barge to
remove it. It lasted about 12 years, though. Hard to argue with that
performance!

Jason Szumlanski
Principal Solar Designer | Florida Solar Design Group
NABCEP Certified Solar Professional (PVIP)
Florida State Certified Solar Contractor CVC56956
Florida Certified Electrical Contractor EC13013208

On Wed, Jun 17, 2026 at 4:54 PM Chris Daum via RE-wrenches <
re-wrenches at lists.re-wrenches.org> wrote:

> Yes, I’ve been selling these since 2007.  Damn good batteries; I did hear
> from Tommy in a roundabout fashion; THE contact person at Enersys is Jammie
> Bednarek, 484-203-8660, and her e-mail is jammie.bednarek at eversys.com.
> If you have a bunch of these batteries out there, take note!
>
>
>
> And thanks for your input.
>
>
>
> Chris Daum
>
> Oasis Montana Inc.
>
> 406-777-4309
>
>
>
> *From:* RE-wrenches <re-wrenches-bounces at lists.re-wrenches.org> *On
> Behalf Of *Ray Walters via RE-wrenches
> *Sent:* Wednesday, June 17, 2026 12:33 PM
> *To:* re-wrenches at lists.re-wrenches.org
> *Cc:* Ray Walters <ray at solarray.com>
> *Subject:* Re: [RE-wrenches] Solar One HUP batteries
>
>
>
> 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
>
> W - www. greatsolarworks.com     www.solarwork.com
>
> *“Responsible Technologies for Responsible People since 1988!”*
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