L-16 "cycling" requirements? [RE-wrenches]

[Windy Dankoff, Dankoff Solar]

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Bob, Jim,

Between 1977 and 85, I sold used C&D and similar batteries, scrapped by 
telcom and UPS industries. They had those extension tubes going down to 
the bottom of the cell. Numerous times I compared top to bottom 
readings and found no notable difference, except maybe when the battery 
is charging and area above the plates is lagging behind in S.G.

I never found evidence of stratification as a potential problem, even 
in low charge-rate systems.

BTW, the record longevity for those "scrap" batteries I sold was 18 
years -- on a full-time wind/PV home system. Oh, and they were 10 years 
old when I sold them. They were C&D lead-calcium, but I provided strict 
instructions to use a hydrometer and assure no cycling below 50%. Some 
customers took that seriously. Others got only 1-3 years.

Windy


> Bob Ellison wrote:
>>
>> Over a period of time the electrolyte stratifies with the heaver acid
>> settling to the bottom and the lighter water floating to the top.
> ******
> C&D, and I'm sure other battery makers, have a withdrawl tube that
> extends almost halfway to the bottom of the cells case. It allows you 
> to
> pull up acid from near the center of the case where the water/acid mix
> is near it's 'average' strength in case it's not well mixed.
> Those tubes have to be in the corners because it's impossible to
> retrieve acid  via the fill holes except from the very top, the watered
> down part of the mixture. If the cells have tubes, they should be used
> unless the battery has been fully charged and allowed to sit unused for
> several hours, the 'recommended' way to check SG.
> Another good thread...
> Jim Duncan
> North Texas Renewable Energy Inc

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