Thu, 07 Jun 2007

solar powered t-amp

solar panel laying on the roof
Solar panel laying on the roof.



I've been working on this project over the past couple of months and have finally got it all together. It's basically just a little T-Amp running from a battery bank that I power with a solar panel. I had the idea a little while ago as it pretty much all fits together nicely since the T-Amp is designed to run from a 12Volt battery source, and it just so happens many solar panels are designed for charging just this type of battery. Searching on the net I found someone had already done this as well as outlined on an article on New Consumer. And searching for that article to add the link to this post I see someone has recently posted an instructable for this same idea as well.

But anyways, I thought I'd post what I did anyways even if it's not unique :)

The first thing I did was get a reasonably sized solar panel. I ended up finding a 40 watt SL040 Sunlink PV panel on ebay, sold new from a seller in Toronto who runs a store on ebay called Go Green Energy. The panel was about $320 all said and done and it came with a charge controller as well. This panel is rated at 17.2 volts at 2.33 amps, however since I am charging a 12 volt system with it my effective wattage form the panel is ~28W, but it seems to output that even on cloudy conditions and such which is why I think the panel is designed to be 17.2 volts. It's a little bit wasteful in full sunlight, but does work in a wider range of partial sunlight conditions. (At least thats how I understand it. I'm no expert). It's also pretty small measuring 25"x21" so it fits on our little porch without having to do any work mounting it to the roof or anything.

view from porch onto street
View from porch onto street...



close up of the panel
Close up view of the panel.









two workaholic U2200 batteries in series
Batteries wired in series.



So with the panel I was able to hook the T-Amp directly to the battery terminals from the charge controller and listen to music when it was daylight. However I needed to get some batteries so I could keep it running beyond that. I managed to get two Interstate Workaholic U2200 Deep Cycle batteries from a guy at work for free which was a pretty good score as they would be around $80 each to buy I believe. These are 6 volt batteries with 220 amp hour rating. I hooked them up in series and so I have a 12V battery bank with lots of power now. This should be enough to run the T-Amp for 200+ hours. I'll probably end up hooking up some other 12 volt items to this bank though as the panel should be able to keep the battery charged pretty easily.

To wire everything up I've run the solar panel into the charge controller (as seen in the photo below). I then have the positive feed from the charge controller running to the battery where it is fused off with a 4 amp automotive fuse as close to the battery as possible. The negative lead simply runs directly to the battery. I then have the T-Amp power running to the positive terminal where it is fused off with a 5 amp fuse in another automotive fuse holder. (I purchased the fuses and fuse holders from the automotive section at canadian tire). And the negative lead from the T-amp wried in directly to the negative side of the battery terminal as well. You can also see the jumper cable I'm using in between the two batteries to wire them in series (connecting the positive post of one battery to the negative post on the other battery.

And thats pretty much it. I've been running it on the battery bank now for a week or two and it's been working like a charm.




fuses connected to the postive terminal
Fused positive terminal. Using a 4 amp fuse inbetween the charge controller and the batteries, and a 5 amp fuse between the batteries and the T-Amp


charge contoller
The charge controller, black wires are coming in from the solar panel, and the blue wires are running to the battery. The T-Amp (load) connects to the battery itself.


T-Amp hooked up and running
T-Amp hooked up and running from solar power.




posted at: 20:21 | path: /energy | permanent link to this entry


Sat, 02 Jun 2007

pystone benchmarks

These aren't very sceintific tests, but it's interesting to see the difference from processor to processor. The test I'm performing is a builtin pystone benchmark from the test module in python that tests mostly cpu performance in executing python code. It is simply done by doing the following on a *unix box:

from test import pystone
pystone.main(500000)

It will then output the time it took and the pystones/second value. Run it a few times and take the lowest value. Here are the results from a bunch of machines I have access too:
MachineTimepystones/second
Intel Core 2 Duo 6600 (2.4 ghz)7.0471022.7
Intel Xeon 5110 (1.6 ghz)10.4247984.6
Athlon s969 3200+ (2.0 ghz)12.0241597.3
Athlon s969 3000+ (1.8 ghz)13.3737397.2
AMD Hammer? (1.6 ghz)14.9533444.8
AMD Opteron 242 (1.6 ghz)15.2032894.7
Intel Pentium 4 (2.4 ghz)16.5330248.0
AMD Sempron (1.6 ghz)17.0129394.5
Epia M6000 (600 mhz)74.546707.8
Intel Celeron (300 mhz)100.894955.9

graph

As can be seen from the graph the new Core 2 Duo chip I got outperforms my old AMD 64 3000+ by almost double in this test. And it really does make quite a noticeable difference in just day to day use. Well worth the upgrade I would say...

posted at: 00:00 | path: /general | permanent link to this entry


2019-Sep
2019-Jul
2019-Jun
2019-May
2018-Dec
2018-Jan
2017-Aug
2017-Jun
2017-May
2016-Nov
2015-Dec
2015-Nov
2015-Oct
2015-Jul
2015-Jun
2014-Dec
2012-Oct
2012-Sep
2012-Jun
2012-Feb
2012-Jan
2011-Dec
2011-Sep
2011-Aug
2011-May
2011-Feb
2010-Jun
2010-Apr
2010-Jan
2009-Sep
2009-Jul
2009-May
2009-Jan
2008-Oct
2008-Sep
2008-Jun
2008-May
2008-Jan
2007-Nov
2007-Oct
2007-Aug
2007-Jun
2007-May
2007-Mar
2007-Feb
2007-Jan
2006-Nov
2006-Oct
2006-Sep
2006-Aug
2006-Jun
2006-Apr
2006-Jan
2005-Dec
2005-Nov
2005-Oct
2005-Sep
2005-Aug
2005-Jul
2005-Jun
2005-May
2005-Apr
2005-Mar
2005-Feb
2005-Jan
2004-Dec
2004-Nov
2004-Oct
2004-Sep
2004-Aug
2004-Jul
2004-Jun
2004-May

Powered by PyBlosxom | RSS 2.0