Path: news.eternal-september.org!eternal-september.org!.POSTED!not-for-mail
From: Don Y <blockedofcourse@foo.invalid>
Newsgroups: sci.electronics.design
Subject: Re: Grand Apagon - Electricity (not) in Spain
Date: Fri, 9 May 2025 20:52:13 -0700
Organization: A noiseless patient Spider
Lines: 33
Message-ID: <vvmihe$3arrq$1@dont-email.me>
References: <vuqgef$1of93$1@dont-email.me>
 <0mnc1ktrd7v0qvpi062rf5lbemp6f4pk8a@4ax.com> <vv5q3r$647n$1@dont-email.me>
 <vv6vjh$19ddn$2@dont-email.me> <ff3kelxmm6.ln2@Telcontar.valinor>
 <vv8i6e$2o41i$1@dont-email.me> <6r0lelx0c8.ln2@Telcontar.valinor>
 <vv990t$3gsv4$1@dont-email.me> <kvkmelxf9k.ln2@Telcontar.valinor>
 <6cgh1k9mkuae63gn4dd8ej49o3au4m0l67@4ax.com>
 <1rbvfbs.10nr9w6pkdoawN%liz@poppyrecords.invalid.invalid>
 <vvckil$2k8fj$1@dont-email.me> <sn4pelxjs.ln2@Telcontar.valinor>
 <vvcv7e$2tnvd$1@dont-email.me> <ajrpelxjql.ln2@Telcontar.valinor>
 <vve0b0$3r29s$1@dont-email.me> <8brrelxb35.ln2@Telcontar.valinor>
 <vvfiir$10k3s$1@dont-email.me> <ic0selx3dm.ln2@Telcontar.valinor>
 <vvfmht$11iac$1@dont-email.me> <evtselxgev.ln2@Telcontar.valinor>
 <vvgonn$19stn$1@dont-email.me> <vvi2n4$1n4pj$1@dont-email.me>
 <p4muelx89p.ln2@Telcontar.valinor> <vvj9co$265vt$1@dont-email.me>
 <de81flxqff.ln2@Telcontar.valinor> <vvlsq9$31drb$2@dont-email.me>
 <ejm2flxqd6.ln2@Telcontar.valinor>
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8; format=flowed
Content-Transfer-Encoding: 8bit
Injection-Date: Sat, 10 May 2025 05:52:15 +0200 (CEST)
Injection-Info: dont-email.me; posting-host="02039b3e0a3af19060eed3f3b536417c";
	logging-data="3501946"; mail-complaints-to="abuse@eternal-september.org";	posting-account="U2FsdGVkX1/pD5yG0CM/VJ8KGuaZs6vu"
User-Agent: Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:102.0) Gecko/20100101
 Thunderbird/102.2.2
Cancel-Lock: sha1:aMHpRmhxeJqQxOxZjPD8EkrWQW0=
Content-Language: en-US
In-Reply-To: <ejm2flxqd6.ln2@Telcontar.valinor>

On 5/9/2025 6:26 PM, Carlos E.R. wrote:
> On 2025-05-09 23:41, Don Y wrote:
>> On 5/9/2025 5:18 AM, Carlos E.R. wrote:
> 
> ...
> 
>>> When looking at specs for a replacement UPS, possibly an Eaton, I saw they 
>>> mentioned emitting a beep when battery is bad.
>>
>> They likely don't load test, then.  Perhaps just watch the open
>> circuit voltage on the "charged" battery.
>>
>> It is distressing how little the technology associated with
>> battery monitoring and charging has advanced in these sorts
>> of applications.  Again, likely because there is little
>> incentive to maximize battery life!
> 
> At my garage they have some gadgetry that I have not seen to test batteries. I 
> saw the one at the battery shop. I assume they put some calibrated load on the 
> battery and measure both voltage and current, and make some estimate on battery 
> life. The one at my garage has a printer, I got the paper slip somewhere.

Yes.  "Load testing".  The goal being to determine the maximum
"cold cranking amps" that it can deliver to the starter at
a specific load voltage.  There's some magic involved as the
CCA specification pertains to operation at 0C (or 0F?  I don't
recall) and chances are, you're not going to be testing at that
temperature.

Cold temperatures impede the efficiency of the battery and, at the
same time, make the mechanical load appear larger.  I think they
combine to represent about a 4X performance hit.