Separate out the individual series strings and run each string to a buss
bar setup. Remember it isn't just resistance differences between
batteries but resistance difference between cells as well. In a setup
like the existing one the resistance differences can really add up and
if one battery fails the entire system will be offline. Running each
string to a positive and negative common buss bar means you can remove
individual strings without disrupting the entire storage and the system
can continue operating. Also, it means the only resistance issues of
substance are within individual series pairs not the entire
interconnected bank.
I ran 10 series pairs of 12v AGM batteries, each pair to a common buss
and it was the longest lasting, most stable battery bank I had. That
was years ago and now it would require fusing each string but for
longevity and stability it is the best bet.
Tom
On 2018-07-23 03:56, Dave Tedeyan wrote:
Since we are on the topic of bad battery practices...
I may be fixing up a system that was both designed and installed very
poorly.
They have a 24V Outback VFXR inverter, and ten 12V AGM batteries wired
into
5 parallel strings. I know that is a bad idea, but since they already
have the
equipment, are there any safety issues by re-using this equipment? It
is for a
grid tie battery backup system that will remain in float most of the
time. I assume
that the batteries will not last particularly long, but is there any
harm in using them
and then just getting new batteries once they fail?
Stringing is shown in the attached picture.
Cheers,
Dave
--
Dave Tedeyan
SENIOR ENGINEER
TAITEM ENGINEERING, PC
10 Verizon Lane, Lansing, NY 14882
Voice: (607) 930-3481 x6
www.taitem.com [1]
Links:
------
[1] http://www.taitem.com/
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