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From: Lars Poulsen <lars@beagle-ears.com>
Newsgroups: comp.sys.raspberry-pi
Subject: Re: Fwd: Backup power supply
Date: Wed, 10 Apr 2024 06:15:07 -0700
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On 4/6/2024 1:32 AM, The Natural Philosopher wrote:
> On 05/04/2024 22:08, Lars Poulsen wrote:
>> On 15/03/2024 10:51, Ahem A Rivet's Shot wrote:
>>  >>     Make that 5 minutes * 500W/5W or 500 minutes which is indeed a
>>  >> long time but a lot shorter than the 150 hours you were expecting.
>>
>> On 3/15/2024 6:43 AM, druck wrote:
>>  > If you want 150 hours, you need to be looking at a backup generator,
>>  > so your UPS only needs to last as long as it takes for your generator
>>  > to fire up.
>>  >
>>  > That's usually a couple of minutes for professional diesel ones, but
>>  > as its home setup it might take you a few minutes to connect it up and
>>  > pull the starter cord on a cheap petrol one.
>>  >
>>  > It might then take a few more minutes to drain the tank of the sludge
>>  > that used to be fuel last time you used it, and to run to the garage
>>  > to get some fresh petrol.
>>  >
>>  > It might take a few more minutes if your spark plugs have been fouled
>>  > as you didn't clean it after use, and your air filter has a hundred
>>  > different types of bugs living it.
>>  >
>>  > So make sure the UPS lasts an hour or 2.
>>  >
>>  > Oh and once you've managed to get it going, and it's making a
>>  > tremendous racket, just remember everyone else in the neighbourhood
>>  > who is without power will be turning to look in your direction...
>>
>> I read this and feel first-world superiority for having last year 
>> installed a 14kW Generac system, powered by our municipal natural gas 
>> supply. In case of a power outage, it kicks in within about 10 
>> seconds. When the grid comes back up, it syncs the AC to the grid 
>> before pulling the relay to reconnect. And every other Wednesday, it 
>> tests itself for 10 minutes, synchronizing before going off-grid as 
>> well as before going back on-grid.
>> In case the muni gas is down, my electrician will come over and 
>> install the propane conversion kit. (I don't have a good place to keep 
>> propane tanks.)
>>
>> -- Lars
> 
> I think I will print a small nuclear reactor on my 3D printer and go off 
> grid entirely :-) :-)
> 
How large is your 3 printer? Do you know of a power generator that fits 
in a cubic foot? (Thermal, maybe? like what NASA uses for inerplanetary 
probes?)