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Old 2021-02-11, 09:06   #12
retina
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Quote:
Originally Posted by VBCurtis View Post
Keep an eye on battery-backup-system prices; items akin to the Tesla powerwalls are getting quite reasonable.
If it is just a single residential dwelling with only short periods of peak usage, maybe. Otherwise far too expensive to be practical on a larger scale at 24/7.
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Originally Posted by M344587487 View Post
How much of your power needs are for heating?
Heat generation is not an issue. The machines generate plenty. It is heat removal that needs to be addressed.
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Originally Posted by Uncwilly View Post
Also, depending on the size of one's lair, pumped hydro or something like this could be a good option.
There is nowhere to pump it to. The nearest hilly bits are too far, and not accessible.
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Originally Posted by Dr Sardonicus View Post
Here in the good ol' USA, if you live "close enough" to a local utility's grid, you may be legally obligated to "tie in" (and pay for the service) even if you don't use any power.
This isn't the case for me. I had to pay a lot to get the cables run to here. If I disconnect, the supplier can't stop me.
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Originally Posted by kruoli View Post
In one episode, he looked for ways to create his own energy, so he tried exactly what Dr. Sardonicus stated above - he set up a bicycle and rode it. He was able to continuously output 100 W without getting too uncomfortable.
Umm, okay. 100W won't even power one machine. It would need a whole lot of minions to power everything. And the humans generate more heat than the machines; about three times extra (IIRC) for each Watt of output! Perhaps at -40 degrees that could work, but it isn't always so cold, anything hotter and the place would be unbearable.

Solar with some sort of better storage is best IMO.
Second option is a small nuclear thing. But ... so many problems with that ATM.

Practical options for storage might be suspended weights (similar to the water pumping) but they need so much height and space to be usable that such a structure (whether it is a tower, or a well, or both) is challenging.
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Old 2021-02-11, 13:08   #13
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One option I haven't seen mentioned in this thread is flywheel energy storage systems.

Apart from more fans to move hot air, or some kind of coolant system that could dump the heat into a hot water tank, I can't think of much offhand on the waste heat front. Perhaps you could power a fan instead of a computer by pedal power.
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Old 2021-02-11, 14:55   #14
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Quote:
Originally Posted by retina View Post
There is nowhere to pump it to. The nearest hilly bits are too far, and not accessible.
What about a water tower or tank? 50,000L at 15m has quite a bit of potential. Used utility poles are widely available and can be used to make such a tower. https://lmatimber.co.nz/reclaimed-timbers/ Plastic tanks are available. That is something that can likely be scrounged up.
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Old 2021-02-12, 03:45   #15
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What about a water tower or tank? 50,000L at 15m has quite a bit of potential.
Approx potential energy (mgh) ~= 50k * 9.8 * 15 ~= 7.35MJ ~= 2042Wh
Spread over say 20 hours (night time + clouds/winter/whatever) ~= 102W (assuming 100% conversion to the output target)

Nope.

If there was a way to increase gravity ...
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Old 2021-02-12, 03:49   #16
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Quote:
Originally Posted by retina View Post
Approx potential energy (mgh) ~= 50k * 9.8 * 15 ~= 7.35MJ ~= 2042Wh
50,000 L H2O = 50,000,000 g =/= 50 kg

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Old 2021-02-12, 03:57   #17
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Quote:
Originally Posted by Uncwilly View Post
50,000 L H2O = 50,000,000 g =/= 50 kg
The units are in kg. So that is 50k(kg) of water.

1 J = 1 kg⋅m^2⋅s^−2
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Old 2021-02-12, 04:03   #18
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Always show all units.
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Old 2021-02-12, 04:07   #19
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For the same volume and changing water to Osmium there is >22 times more potential energy.

Osmium is cheap, and easy to obtain and work with, right?
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Old 2021-02-12, 04:56   #20
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Quote:
Originally Posted by retina View Post
Osmium is cheap, and easy to obtain and work with, right?
You forgot a "sarcasm" icon here, somebody who didn't watch the periodic videos may believe you. Three sarcasm icons in fact one for each enumerated characteristic.

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Old 2021-02-12, 13:57   #21
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Quote:
Originally Posted by retina View Post
For the same volume and changing water to Osmium there is >22 times more potential energy.

Osmium is cheap, and easy to obtain and work with, right?
Yes, absolutely! Especially if you want to liquefy or fluidize it, in which case a small amount would likely last you the rest of your life.
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Old 2021-02-13, 08:02   #22
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Why would you need to fluidize it? just fill a barrel with scraps of it, and lift/lower all the barrel
It reminds me, long ago we designed a solar lamp for a Norwegian customer, and at that time, doing some research online, we found out another ("competitor") company built a "gravity powered light". Nice toy, you should google it.

Last fiddled with by LaurV on 2021-02-13 at 08:05
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