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Path: ...!eternal-september.org!feeder3.eternal-september.org!news.eternal-september.org!eternal-september.org!.POSTED!not-for-mail From: wmartin <wwm@wwmartin.net> Newsgroups: sci.electronics.design Subject: Re: energy in UK Date: Thu, 17 Apr 2025 21:44:31 -0700 Organization: A noiseless patient Spider Lines: 51 Message-ID: <vtslbf$28694$1@dont-email.me> References: <6cblvjtuqq506j5l5uvvrkvcvj549klff8@4ax.com> <vtfhp7$25gv3$1@dont-email.me> <vtipp3$13511$1@dont-email.me> <vtka2s$2g8en$3@dont-email.me> <vtme4n$f4pp$1@dont-email.me> <vtmmh7$mjlu$1@dont-email.me> <vtnvoa$1vdsp$1@dont-email.me> <vtpc6n$35tke$1@dont-email.me> <vtpn29$3h3dp$1@dont-email.me> <vtqhji$b9gt$1@dont-email.me> <vtrjdu$1944d$1@dont-email.me> <p468dlx0du.ln2@Telcontar.valinor> <vts4hu$1nl8g$1@dont-email.me> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit Injection-Date: Fri, 18 Apr 2025 06:44:32 +0200 (CEST) Injection-Info: dont-email.me; posting-host="1dcae324ca39321bfb388ddbfbc98823"; logging-data="2365732"; mail-complaints-to="abuse@eternal-september.org"; posting-account="U2FsdGVkX1+81/kZJ/cRek/H5UMioyHcCmHURrSAjWA=" User-Agent: Mozilla Thunderbird Cancel-Lock: sha1:+paYwqEbg5vm68Nm9GQrJm8smng= Content-Language: en-US In-Reply-To: <vts4hu$1nl8g$1@dont-email.me> Bytes: 3616 On 4/17/25 16:57, KevinJ93 wrote: > On 4/17/25 1:50 PM, Carlos E.R. wrote: >> On 2025-04-17 21:05, KevinJ93 wrote: >>> On 4/17/25 2:28 AM, Don Y wrote: >>>> On 4/16/2025 6:55 PM, KevinJ93 wrote: >>>>> On 4/16/25 3:49 PM, Don Y wrote: >>>>> > On 4/16/2025 3:11 AM, Martin Brown wrote: >>>>> <...> >>>>> > Here, the issue is the high PEAK demands that the ACbrrs place on >>>>> > individual >>>>> > subscribers. We could probably get by on a 3-5KW plant -- but, >>>>> only if >>>>> > we could store and deliver for large loads (I think the ACbrr is >>>>> ~14KW). >>>>> >>>>> That's a very large residential A/C. Our 4-Ton unit (48kBTU/Hr) >>>>> takes about 5kW and suffices a 2,900 sq ft house in northern >>>>> California. (Don't you like all these antiquated units!) >>>> >>>> That's the startup load. An inverter for a (pure) solar solution would >>>> have to tolerate that for some large fraction of a second/seconds. >>>> I.e., >>>> you would NEED to be grid-tied in order to support such large loads, >>>> even temporarily. >>>> >>> >>> 14kW startup is about 60A LRA (locked Rotor Amperage). A single Tesla >>> Powerwall 3 battery is rated for 185A LRA and it is very common to >>> have two or more Powerwalls in a system which increases the available >>> short term power. Our A/C has a 104A LRA spec. >> >> What would happen if the inverter on the battery pack doesn't have >> that peak capacity? > > The inverter would trip and power would be cutoff until reset. > >> I mean, an inverter might simply limit the maximum peak current >> without destroying itself, keeping itself all the time within safe >> limits. Would the motor still start, albeit slowly? Or would it stall >> and overheat? Perhaps motors could be designed co cope. I know my AC >> unit has an inverter inside to control the motor, so does my fridge. >> >> ... > > > The inverter can be smart enough to start up in "speed ramp" mode. I had the tripping issue on my 3hp lathe motor in high speed gear, until I programmed the inverter to ramp up to speed over several seconds. It's all about inertia in this case, maybe not so simple with a compressor load attached.