[RE-wrenches] Two sealed battery questions, please
Ray Walters
ray at solarray.com
Mon Nov 12 15:28:23 PST 2012
I'd say the old batteries are worth at least their recycle value up to
maybe
double that. Might make some one a great set, but then they might be
barely worth the trouble of moving and hooking them up.
I always try and not make too much on something like that, so there's no
hard feelings if they don't last very long.
A solid load capacity test would tell you a lot more about them.
Ray Walters
On 11/12/2012 3:55 PM, Allan Sindelar wrote:
> Wrenches:
> First question: for a large grid-tied with battery backup system (9.8
> kW array, two SB5000s, dual Sunny Islands), we have offered the
> customer the choice of either one 48V string of 24 2V Concorde
> SunXtender PVX-121HT, for 1,200 A/hr, or a set of Absolyte GP 100G23s,
> for 1,260 A/hr (at the 20 hour rate), the closest match. The prices,
> surprisingly, are quite close - the Absolytes are a bit less
> expensive, given the additional cost of battery enclosures and labor
> for the Concordes. I have avoided recommending one or the other on the
> basis of battery service life, as we haven't enough experience with
> the Absolytes. The question: which of these battery options would you
> recommend to the customer, and why?
>
> Second question: Four years ago, well before we got involved, the
> customer purchased a 24V set of used Absolyte IIP telecom batteries
> and we agreed to incorporate them into this system. I contacted Direct
> Power on their behalf to inquire about obtaining a second 24V set of
> batteries to add to their set of 3-100A33s to make a 48V bank. I
> learned that they have no more of these sets in stock and have no firm
> expectation at present of getting any more. I had asked here about
> finding a set and about mixing new with old but received no responses.
>
> We will be going with a new set of batteries, either Absolyte or
> Concorde. This leaves the old set up for resale. But in the process we
> learned via the date codes that the customer's set was eight years old
> when he got them, and have been in their possession unused in a barn
> since then. See below for the customer's description of them. The
> question: what is the expected remaining life of these 12 year old
> cells, assuming the best - that they were left fully charged and in
> float for eight years and seldom if ever cycled? What might they be
> worth today, if anything?
>
> Thank you,
> Allan
>
>
> -------- Original Message --------
>
> Hi Allan,
> Here is that note regarding batteries. I have 4 Absolyte batteries
> manufactured in 2000, model # 589 508 kkc 7667,7668,7670,7674. They
> have been used for back up in the telecommunication field. I have
> owned them since 2008 and they have been float-charged on a monthly
> basis to keep them topped-up. I think their condition is good---
> although I have not load-tested them. They were purchased for a
> project that is no longer in play and so I would like to pass them along.
> Ted
>
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