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Backup Batteries

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Posted by Slick on September 16, 2008, 6:02 pm
Hi Guys ,

I know a lot of people setting up their own solar / backup systems are
working on tight budgets , Have read quite a bit about people buying Trojan
L16's , T105's etc for storage and inverter operation.
Just wondering if money wasn't the deciding factor what people would
actually be using ?, It seems to me that large Gel batteries like Haze N200
230AH 12 v and a few others similar to these are the ultimate in all aspects
for all the requirements of backup and inverter operation , but being 6 plus
times the cost of lead acid batteries they are mostly out of reach for
people needing large battery banks .
Very interested to hear peoples views , I think Trojans wet cells have been
done to death as if they are the only batteries suitable to our needs.

While on Batteries banks thought I would walk over some well worn road
Series V Parallel :

It seems the jury is still out on the Series vs Parallel myths / facts  ,
but after a great deal of research it seems that the anti parallel brigade
are all old school or younger guys going on information provided from the
same old sources , all I know for certain is that all the largest Telco
companies around the world use massive series banks with some upwards of 30
parallel banks that are swapped out at set time intervals .
Actually everywhere I have looked the only series banks I find are small one
of home backup systems , some not so small but in comparison to commercial
setups which all have Series banks connected to cascades of parallel banks .
In a couple of cases where I have been able to speak to techs in this field
, they have mentioned unless parallel banks are connected to buss bars , the
loads across individual series banks can vary greatly , as one guy said no
buss bars means fuel for anti parallel bank supporters.
That is use cables for Series and only Buss Bars for the Parallel
connections , the load and charge must only connect to the buss bars where
the load is shared across all banks equally., each Parallel bank should be
fused at the positive end of the last battery in the series string.

Posted by You on September 16, 2008, 8:09 pm

The "Big Boys", for whom money isn't a problem (governments) use
Batteries like Absolyte II's, which are AGM Type for Remote Site
Systems. Some of the newer stuff  is NiMH as well, and the "Bleeding
Edge" stuff is going to Li Batteries for their Power Density.
All the above are VERY MUCH more expensive per Watt/Hour then Wet
Lead Acid or Alkaline Cells, but if money isn't the object, or
criteria, then there are many more options.  The Navy went to Wet
NiCads years ago, and rightly so, for their uses.

Posted by nicksanspam on September 17, 2008, 2:09 am

The "Big Boys" know the units :-)


Posted by bealiba on September 17, 2008, 12:03 pm
 On Sep 17, 12:09 pm, nicksans...@ece.villanova.edu wrote:

The real big boys know about duty cycle for motors.

Posted by bealiba on September 17, 2008, 12:08 pm
People who use golf cart batteries do so because they listen to old
wives tales.

Parallel batteries are now, have always been, and will continue to be
the second best choice for home power energy systems.

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