Installing a geyser timer

Dolby said:
I'm agreeing with you - but it isn't shorter is automatically better (like I thought)

When I went from 24hrs on to 8hrs on, I saved 30% - so I thought going from 8hrs to 2hrs, would save even more. But 2hrs on uses the same power as 24hrs on
Click to expand...

How can a 3Kw element use 12 KWh in 2 hours, or am I missing something.
 
Stokstert said:
How can a 3Kw element use 12 KWh in 2 hours, or am I missing something.
Click to expand...

Dolby was monitoring the TOTAL usage in his home, including the geyser. He was then comparing that total usage with the various time settings. The assumption is that during the period, all other usage was more or less the same and any variation could be attributed just to the changes in energy use by the geyser.
 
Thanks for your answer but for me it still isn't very convincing as this experiment is not very scientific. Maybe some other high capacity users like a tumble dryer or iron was used in two of these observations and not in the low one.
 
The single biggest energy user in the home is heating water. Hence, while you are correct that the results are not all that accurate, the results are representative enough provided Dolby maintained his normal user profile as more or less the same. Obviously, monitoring only the geyser usage would be more accurate.
 
Stokstert said:
Thanks for your answer but for me it still isn't very convincing as this experiment is not very scientific. Maybe some other high capacity users like a tumble dryer or iron was used in two of these observations and not in the low one.
Click to expand...
I'm the only one at home ... and the same appliances run day in, and day out, with the same same load.

I can get in after work and usage is almost a guaranteed 12kWh on the dot. Sometimes, I get in and 12.3 and other times it's 11.8... But that's a tiny variance.

You don't need to believe it or anything - but it's my observation
 
Your observations stack up with those tabled in the reference I posted. Therefore, in principle, the observations are ballpark accurate enough to understand the relationship between hot water drawn off, the temperature differential, timing and energy consumption.

What you measured is exactly what a Geyser wise unit does in optimising what they call a "profile".
 
Thanks again. Sorry for high jacking this thread.

@Dolby Sorry, I am not questioning your observation, only my own logic.

Just for general information here is my observation.

Before I installed my Solar geyser my usage of the electric geyser was monitored for 6 months and thereafter ever since with an Owl meter. In 98 months my usage was 2655 kWh which gives a mean of only 27,1 kWh per month whereas the mean usage before was 256 kWh/m, giving a saving of more than 85%.
 
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No question there. Solar heating is hugely beneficial because it virtually removes completely the largest user of electrical energy out of the equation.
 
Crikey, I have solar geyser(s), a heat pump for when I need to heat up the water when the solar is not enough and I use 900 - 1000 KW/Hr per month. How does one use so little?
So i'm using 30 - 35 KW/Hr a day. I must say when I went solar geyser I did see a drop of about 20 - 25% in electricity consumption. The problem is that my system is a bit too small for the number of people in the house, so I opted for the heat pump as a supplement because of a lack of north facing roof by the geysers. The heat pump is using 3 - 5 KW/Hr a day.
 
Good job, apart from you could have maintained the quality of the wiring standard by routing the cables better.
On the other hand, the DB now looks like an electrician actually did the job! :rolleyes:
 
This is how I measure my electricity consumption and it has a measurement of KWHr which I assume is the same as kWhIMG_20190420_181302.jpg
 
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