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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 16:04:28 +0200
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On 2025-05-10 04:37, Don Y wrote:
>> Yes, of course. Around here we have many flat roofed houses. Many of 
>> those use aluminum foil with asphalt. If well done, it could hold a pool.
> 
> Sadly, organic debris accumulates on them.  Then, water gets trapped
> in the debris -- and slowly rots the roof in that location.  Drainage
> being important and hard to accomplish with low pitch.

The intense sun dries it up soon :-)


>>> I've tried a new configuration where I am hanging many of the
>>> UPSs off a couple of larger units.  The thinking being that I
>>> only have to maintain the larger units' batteries (and still
>>> get the benefits of a UPS per workstation).
>>
>> Maybe just a big unit, and wiring around the place. Red coloured 
>> sockets. Lilke in computer centres.
> 
> Wiring *in* the structure would necessitate an inspection.
> But, plugging three UPSs (with long power cords) into a
> single UPS is acceptable.  Then, the single UPS can
> serve those three loads or any combination.

Ah.

> 
> ONE set of batteries to replace (let the other three "slaves"
> complain that they are missing batteries... who cares?!)

Why not remove those three UPS, and connect the loads direct to the main 
UPS?  :-?

> 
>>>>> Digikey used to have a policy of free shipping for prepaid (cash)
>>>>> orders.  I would buy batteries in lots of 10 and send prepayment.
>>>>> Shipping charges can be a significant fraction of a battery's
>>>>> cost.  They now exclude batteries from this policy (when I last
>>>>> checked).
>>>>
>>>> Right, they are very heavy. Yep, the place above charges 5.25€ for 
>>>> shipping.
>>>
>>> As I said, I try to rescue them (often I come across NiB UPSs
>>> that some moron in IT ordered but opted not to install.
>>> As the recycle value of batteries is just weight (regardless of
>>> ability to hold a charge), I swap my dead batteries for such
>>> new batteries and everyone is happy!
>>
>> :-D
> 
> An SLA battery is worth about 22c/pound for its lead content.
> So, *taking* viable batteries is effectively theft (though on
> a very small scale).  Replacing them with an equivalent
> weight of recyclable lead leave no grounds for objection:
> "How better to RECYCLE this *good* battery than to return it
> to service?!"

Indeed :-)

-- 
Cheers, Carlos.