mersenneforum.org  

Go Back   mersenneforum.org > Great Internet Mersenne Prime Search > Hardware

Reply
 
Thread Tools
Old 2011-12-16, 11:23   #1
fivemack
(loop (#_fork))
 
fivemack's Avatar
 
Feb 2006
Cambridge, England

23·797 Posts
Default Pesky electricity

At the moment, I'm using about 1250 watts 24/7, almost all consumed by computers.

I just got the bill for September 1 - November 30; £380. Which is getting to be really quite a lot of money; the price of the big compute server over three years (though nothing like as much as anywhere local will charge me to co-locate the big compute server ... they seem to want to charge quite a lot per hundred milliamps of power, and it uses 2.5A or so)
fivemack is offline   Reply With Quote
Old 2011-12-16, 13:19   #2
em99010pepe
 
em99010pepe's Avatar
 
Sep 2004

2×5×283 Posts
Default

Electricity is expensive for home users. If you know someone that can host your machine in an industry or university that would be perfect. I'm considering that....
em99010pepe is offline   Reply With Quote
Old 2011-12-16, 13:22   #3
Dubslow
Basketry That Evening!
 
Dubslow's Avatar
 
"Bunslow the Bold"
Jun 2011
40<A<43 -89<O<-88

3×29×83 Posts
Default

I'm in a dorm. Not cheap, but fixed price for unlimited utilities
Dubslow is offline   Reply With Quote
Old 2011-12-16, 13:27   #4
nucleon
 
nucleon's Avatar
 
Mar 2003
Melbourne

5·103 Posts
Default

I'm at the point where it's financially viable to pay for solar.

Except, I'm in a high rise unit so no access to roof space. :(

-- Craig
nucleon is offline   Reply With Quote
Old 2011-12-16, 13:35   #5
em99010pepe
 
em99010pepe's Avatar
 
Sep 2004

1011000011102 Posts
Default

Quote:
Originally Posted by nucleon View Post
I'm at the point where it's financially viable to pay for solar.
Are you sure? I don't think so. Did you make ROI calculations?
Anyway, by looking at a Portuguese electricity bill more than 60 % of the energy comes from renewable sources ( wind power, hydro power, solar, PV) but energy price just keeps rising...that's something to think off.

Last fiddled with by em99010pepe on 2011-12-16 at 13:36
em99010pepe is offline   Reply With Quote
Old 2011-12-16, 13:47   #6
Christenson
 
Christenson's Avatar
 
Dec 2010
Monticello

5·359 Posts
Default

em, remember that what you pay for electricity is really a tax...the total system cost has to be paid for, including all installed sources, and all the resources they use, including transmission...there's quite a build-out going on right now, so that the excess from the renewables can be moved all the way across europe...

And at 400 pounds per month, solar PV collectors at the current price of about $2 per installed watt start looking like very attractive investments...particularly if you can get the computer to use exactly what the PV array puts out at any given time, so don't have to invest in storage, long-distance transport, etc.

Looks like a good hacking project for a UPS....build a 1KW computer supply which blends line, solar, and battery power to supply regulated 12V to the ATX and PCI power connectors. Or hook into the "line interactive" or double-conversion UPS with solar power.
Christenson is offline   Reply With Quote
Old 2011-12-16, 13:57   #7
em99010pepe
 
em99010pepe's Avatar
 
Sep 2004

54168 Posts
Default

Quote:
Originally Posted by Christenson View Post
em, remember that what you pay for electricity is really a tax...the total system cost has to be paid for, including all installed sources, and all the resources they use, including transmission...there's quite a build-out going on right now, so that the excess from the renewables can be moved all the way across europe...
I know but in Portugal those renewable resources are still funded by government (in % I can't recall) so now with Troika those funds will be cut off. For industry electricity cost rised 20 % this year, next year more 5 %...


Quote:
Originally Posted by Christenson View Post
And at 400 pounds per month, solar PV collectors at the current price of about $2 per installed watt start looking like very attractive investments...particularly if you can get the computer to use exactly what the PV array puts out at any given time, so don't have to invest in storage, long-distance transport, etc.

Looks like a good hacking project for a UPS....build a 1KW computer supply which blends line, solar, and battery power to supply regulated 12V to the ATX and PCI power connectors. Or hook into the "line interactive" or double-conversion UPS with solar power.
I don't discuss your price because it depends on the region you are. "Googling" I got your number but don't forget that you need a brutal area for your PV system, do you have it at home? What about solar orientation, panels inclination, etc...?
If solar was viable more systems would be available more cheaper and don't forget that they have very low efficiencies.
Finally, it is not as simple as you say to connect the PV system to the grid...it is just as complicated as a wind generator. Electricity produced by those means have bad quality energy full of harmonics, etc...it's like introducing a frequency regulator to a motor where although you reduce consumption you need to install a set of capacity batteries to reduce reactive energy.

Last fiddled with by em99010pepe on 2011-12-16 at 14:04
em99010pepe is offline   Reply With Quote
Old 2011-12-16, 14:02   #8
fivemack
(loop (#_fork))
 
fivemack's Avatar
 
Feb 2006
Cambridge, England

143508 Posts
Default

It's 400 a quarter rather than 400 a month; at 400 a month solar is undeniably a good idea. The first supplier I found in the UK charges £5 per installed watt, raw panels are a bit over £2 per installed watt ... so 1250W would be about £6250 and (assuming a load-factor of 0.3 and that I feed all the electricity it produces to the compute farm) pay for itself in about a decade at current prices, which isn't unreasonable. The main reason I haven't done something in that direction is that I don't own my house.

(for comparison, I'd need something like £25,000 invested in one of the higher-dividend-paying blue-chip shares - Glaxo, Vodafone, Unilever - to pay the electricity bill out of dividends)

I have switched to a 'green energy' company which spends its profits on building wind parks; the financial result is, I think, simulating what the world would be like with a plausibly-sized carbon tax ... not unendurable, but making me think a bit more about energy efficiency, and contemplate replacing inefficient machinery (for values of inefficiency measured in factors per watt-hour) before it breaks.

Last fiddled with by fivemack on 2011-12-16 at 14:43
fivemack is offline   Reply With Quote
Old 2011-12-16, 14:08   #9
em99010pepe
 
em99010pepe's Avatar
 
Sep 2004

2×5×283 Posts
Default

Quote:
Originally Posted by fivemack View Post
It's 400 a quarter rather than 400 a month; at 400 a month solar is undeniably a good idea. The first supplier I found in the UK charges £5 per installed watt, raw panels are a bit over £2 per installed watt ... so 1250W would be about £6250 and (assuming a load-factor of 0.3 and that I feed all the electricity it produces to the compute farm) pay for itself in about a decade at current prices, which isn't unreasonable. The main reason I haven't done something in that direction is that I don't own my house.
Ask them about life expectation of the raw panels? Your price is only for the panels, don't forget the rest like installation, wire connection, etc. Your ROI (return of investment) will go up to 20 years.

Last fiddled with by em99010pepe on 2011-12-16 at 14:09
em99010pepe is offline   Reply With Quote
Old 2011-12-16, 14:12   #10
em99010pepe
 
em99010pepe's Avatar
 
Sep 2004

2×5×283 Posts
Default

If you want a better solution look for mini-cogeneration plants with organic rankine cycle. If you live in a village it's a great idea.
em99010pepe is offline   Reply With Quote
Old 2011-12-16, 14:31   #11
fivemack
(loop (#_fork))
 
fivemack's Avatar
 
Feb 2006
Cambridge, England

23×797 Posts
Default

Quote:
Originally Posted by em99010pepe View Post
Ask them about life expectation of the raw panels? Your price is only for the panels, don't forget the rest like installation, wire connection, etc. Your ROI (return of investment) will go up to 20 years.
Life expectation of raw panels is 25 years, and I was using the £5 figure which includes installation, connection and warranty rather than the £2 figure for the panels alone.
fivemack is offline   Reply With Quote
Reply

Thread Tools


Similar Threads
Thread Thread Starter Forum Replies Last Post
Electricity, GIMPS, and inverse relationships stars10250 Soap Box 31 2012-04-10 15:41
On the price of electricity in Denmark fivemack Lounge 1 2011-01-23 19:54
more pesky spam Andi47 Forum Feedback 4 2009-07-19 20:16
Electricity use PrimeCruncher Hardware 9 2004-01-14 17:40

All times are UTC. The time now is 02:11.

Sun Dec 6 02:11:00 UTC 2020 up 2 days, 22:22, 0 users, load averages: 1.61, 2.05, 2.38

Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2020, Jelsoft Enterprises Ltd.

This forum has received and complied with 0 (zero) government requests for information.

Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.2 or any later version published by the Free Software Foundation.
A copy of the license is included in the FAQ.