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My electricity usage analysedday


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I wonder if this will be interesting to others.  I installed an EmonCMS system with some current sensors to get a proper understanding of my load.

I then compared it to generation predictions for a 3kW solar PV system here in Cape Town (stats from that US Department of Energy "pvwatts" site).

We're three in the house with an ordinary 200L electric geyser.  It's short showers since we in Cape Town. I have an old Intel server system that draws 230W or so or 5.5 kWh per day.  So that's pretty expensive to run.

My geyser consumes an average of 10.5kWh per day.
My server consumes 5.5kWh per 

 

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11 hours ago, Elbow said:

 I have an old Intel server system that draws 230W or so or 5.5 kWh per day.  So that's pretty expensive to run.

I have noticed that in the beginning as well with desktop pc , especially the older ones are heavy on the juice , if you take it at 5 units a day at R 2 a unit that is R 3600 a year just to check if some data. I ended up with some laptops that uses a fraction of the power so it might be worth a look at.. 

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On 9/6/2017 at 8:15 PM, Elbow said:

... old Intel server system ...

I also use Intel Servers as desktops. Why? Cheaper than most Pc's nowadays and more importantly, about 75w per hour.

Found that the blade servers are super efficient on power.

EDIT: But boy, when you push the XEON processor, and the fans start, it sounds like a jet taking off. 

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On 9/8/2017 at 2:51 PM, plonkster said:

I have an old SGI O2 from circa 1996... that thing is very thirsty.

Hey!  I used to have one of those - with a beautiful big monitor (by the standards of the time).  I left it behind in the UK when I came home.  A modern PI 3 running Raspian is probably faster but at the time I had it it felt like something special!

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2 hours ago, Elbow said:

I used to have one of those

Still have mine. I think it still boots. Or it did the last time I switched it off... which admittedly was over ten years ago. I cannot bring myself to throw it in the trash, it's too pretty. It's about as fast as a Pentium for everyday tasks, runs at 150mhz, mine has 128mb of RAM. A pi-3 is 1.2ghz with 4 cores and a gigabyte of RAM. Runs Irix 6.51 as I recall. The beauty of that machine was the video hardware that was overlayed with RAM, so you didn't have to shovel bits across a bus between system RAM and video RAM... :-)

 I tried to run NetBSD on it once. No dice. It has the R10k processor, with the cache-coherency issue affecting DMA transfers. So it is pretty useless for anything beside Irix.

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