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From: "Carlos E.R." <robin_listas@es.invalid>
Newsgroups: sci.electronics.design
Subject: Re: Grand Apagon - Electricity (not) in Spain
Date: Sat, 10 May 2025 16:05:35 +0200
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On 2025-05-10 14:03, Joe Gwinn wrote:
> On Fri, 9 May 2025 23:28:29 +0200, "Carlos E.R."
> <robin_listas@es.invalid> wrote:
> 
>> On 2025-05-09 18:22, Joe Gwinn wrote:
>>> On Fri, 9 May 2025 14:18:53 +0200, "Carlos E.R."
>>> <robin_listas@es.invalid> wrote:
>>>
>>>> On 2025-05-08 23:57, Don Y wrote:
>>>>>>> That is a feature of UPS design that specsmanship to get the longest
>>>>>>> run time for the sales datasheet means that they cook their
>>>>>>> batteries. I have seen them swell to the point of bursting inside a
>>>>>>> UPS. Thick rubber gloves needed to remove the remains. Support
>>>>>>> metalwork was a real corroded rusty mess but electronics above it
>>>>>>> remained OK.
>>>>>>
>>>>>> That level of "not working" has not happened to me. Maybe because some
>>>>>> power failure makes me find out that the battery is dead.
>>>>>
>>>>> I've rescued a fair number of UPSs over the years.  In probably 80% of
>>>>> them, the batteries have swollen to the point where removing the battery
>>>>> or battery PACK is difficult.  This is especially true of the "better"
>>>>> UPSs (sine output, 48V battery, metal fabrication) where there is
>>>>> little "give" in the mechanical design.  Often one has to disassemble
>>>>> the UPS to see where one can gain leverage on the battery pack
>>>>> to force it from the case.
>>>>>
>>>>>>> They really think I'm going to buy their vastly overpriced replacements?
>>>>>>
>>>>>> I don't.
>>>>>>
>>>>>> But last battery I replaced was not even two years old, rather 5
>>>>>> months short. I replaced it just in time to serve during the Gran Apagón.
>>>>>
>>>>> That's the problem; you don't KNOW how long a particular battery will last,
>>>>> even in an environment where it is never called on for backup!
>>>>>
>>>>> Instead, you are forced into a "reactive" mode -- waiting for something
>>>>> to tell you you're screwed and need a replacement, now!
>>>>>
>>>>> My largest UPS uses 50 pound batteries (8 of them).
>>>>
>>>> Are they 12 volts each, or just one cell?
>>>>
>>>> On phone exchanges I saw huge batteries, actually individual cells
>>>> connected in series. 48 volts nominally, so 24 cells. I don't think they
>>>> were gel types, they needed adding water now and then.
>>>
>>> The were most likely KS-20472 BELLCELL lead-acid battery cells,
>>> originally made by Western Electric, or European equivalent.  These
>>> are 2.2 volts per cell.
>>>
>>> .<https://library.industrialsolutions.abb.com/publibrary/checkout/107852477?TNR=Installation%20and%20Instruction%7C107852477%7CPDF>
>>
>> Those I saw were prismatic, not cylindrical.
> 
> OK.  Later production is rectangular, largely to improve packing
> density in the battery room.
> 
> The key was the nested alternating conical battery plates that allowed
> the plates to grow and shrink without shorting.

I see. That, I do not remember.



-- 
Cheers, Carlos.