Just let him know what to expect, and he will respect that latter when
it turns out to be true.
Does he need sealed batteries? I'd start talking up an industrial grade
battery for latter. After all this, he'll be ready for a battery that's
going to stay put for awhile.
R.Ray Walters
CTO, Solarray, Inc
Nabcep Certified PV Installer,
Licensed Master Electrician
Solar Design Engineer
303 505-8760
On 8/3/2013 7:46 PM, Mac Lewis wrote:
Ray,
Yes, this is an off-grid applications. I think you are right, the
battery guy sold him what he had. Pretty pricey battery lesson twice!
On Sat, Aug 3, 2013 at 6:42 PM, Ray Walters <r...@solarray.com
<mailto:r...@solarray.com>> wrote:
Mac;
Is this off grid? The Intimidator is not a high cycle life
battery. I've had trouble finding exact ratings, but its probably
in the 250 to 300 cycles at 80% DOD. I'd expect 3 years max in an
off grid application. Also the Intimidators I've seen are
actually AGM, not Gel, but I don't know. I looked on Deka's
website but didn't find any good charge set points. This is
basically a sealed RV/ Marine battery. Definitely not a top
choice, but its what the battery guys have on the shelf, so that's
what they sell.
You're on to the biggest problem, pulling off opposite corners of
the bank to balance the connector resistance between all the strings.
I go out of my way not to poo poo the customer's choice, but to
make sure and let them know you can't guarantee the performance of
the system. I had almost the exact experience just a few months
ago, where the customer had just bought a new set of
Intimidators. I just told him to use them up, no sense in
worrying about it, and when they were worn out, we'd get him
something better. I used AGM setting on the Midnite controller on
that system. Voltage set points should be his responsibility to
track down, if their gel. It keeps you from being responsible for
anything to do with the battery performance or life. When he
needs a new set, you sell him the right stuff, set it up right,
and low and behold you'll look good when they outlast his previous
sets.
R.Ray Walters
CTO, Solarray, Inc
Nabcep Certified PV Installer,
Licensed Master Electrician
Solar Design Engineer
303 505-8760 <tel:303%20505-8760>
On 8/3/2013 5:31 PM, Mac Lewis wrote:
Hello wrenches,
I am looking for guidance with charging setpoints for a battery
that I don't have experience with. This system was put in by
another solar company and this battery bank failed after 1.5
years. He bought these batteries without consulting us, but now
we are stuck with them.
It is a Deka Intimidator Gel Sealed Battery 12V 225 Ahr. It is
set up as 3 strings of 4 batteries to give a 675Ahr bank at 48V.
The batteries were not wired at opposite corners, but
inverter/charger leads were connected to the middle string. We
will fix that and other things but I don't use Deka batteries.
What charger setpoints would you recommend for this battery bank?
Does anyone have a good tech contact at Deka? Anyone have any
results to report about this type of battery in a solar application?
Thanks in advance
--
Mac Lewis
*
"Yo solo sé que no sé nada." -Sócrates
*
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