HUP VS Rolls [RE-wrenches]

[Drake Chamberlin]

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Do the Surretts still require a C/5 charge, once per week, as stated 
on the list previously, to keep the warranty valid?  If so, they are 
worthless for most PV applications, IMHO.

Drake

At 03:49 PM 3/13/2007, you wrote:

>Ray,
>
>I've been told at various times that the characteristics you're 
>describing are the sign of a highly sulfated battery.  That is, the 
>sulfation causes a higher source impedance such as you're 
>seeing.  Did any of the sets see long term intervals of time where 
>they weren't able to reach full charge?  Are you considering using 
>one of the anti-sulfation pulsing tools on any of the battery 
>banks?  Maybe they're more prone to sulfation degradation than other types.
>
>I'm curious to hear all that I can on the Surrettes.  We're looking 
>at switching to them in a major way this season due to both pricing 
>and sourcing issues with Trojan in our region.  But the kind of 
>issues that you and Alan have brought up aren't making this the slam 
>dunk I had hoped...
>
>John Raynes
>RE Solar
>Torrey, UT
>
>
>
>At 04:21 PM 3/12/2007 -0600, you wrote:
>
>>Good News on the HUP, as the Rolls 5000s we installed about 1 to 2
>>years ago are having very disquieting performance. 3 different sets I
>>have tested all behave as if they are close to "death". They quickly
>>run to below nominal voltage when loaded, and then when charged at a
>>c10 to c20 rate, they go to equalize voltages within 5 minutes. If I
>>had just been called out on an old system and saw numbers like that,
>>I would be shaking my head and recommending a new set of
>>batteries.... only I just sold these people new batteries, and talked
>>them into the "better", more expensive Rolls. The Rolls were easier
>>to install than the HUPs, but the HUPS, Bulldogs, Exide Industrial,
>>etc. that I have installed have been very stable, with no problems
>>what so ever. Some have been in for almost 10 years.
>>Rolls seem to be a completely different battery, they don't like to
>>be discharged hard at all. I'm cringing on providing the extended
>>warranty I promised too. At least they're easier to move.....I hope I
>>don't have to.
>>
>>Ray
>
>
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