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From: The Natural Philosopher <tnp@invalid.invalid>
Newsgroups: comp.sys.raspberry-pi
Subject: Re: Fwd: Backup power supply
Date: Sat, 6 Apr 2024 09:32:01 +0100
Organization: A little, after lunch
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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 :-) :-)

-- 
“Some people like to travel by train because it combines the slowness of 
a car with the cramped public exposure of 
an airplane.”

Dennis Miller