Geyser timer solution for solar

G.A.S said:
Times like this it helps to have a good setup: the geyser is on the non-critical line on the inverter, so it will get solar power when there is, mix with AC if solar generation or inverter capacity is insufficient, and go down with loadshedding so it doesn't overload the inverter. :-D

That, and a 5500W Sonoff, Raspberry Pi, and NodeRed.
Click to expand...
Dont think @cavedog's inverter can do that.
 
PCWARITM said:
Where do you okes live that it takes 11.5kwh to heat your geysers?
I run mine for 1.5 hours before 5am and it switches off before the 1.5 hours is up. It's a 3kw geyser... that's less than 4.5kwh.
Click to expand...
2kw element and 70 degrees.
Heating 150 liters of water from 20C to 70C with a 2kW element will take approximately 4 hours and 22 minutes and use approximately 8.72 kWh of energy.
AI calculations though.
Just for a check with 3kw
It will take approximately 2 hours and 54 minutes (174.3 minutes) to heat the water, consuming approximately 8.72 kWh of energy.
With a 3kw equivalent heat pump
It would take approximately 2 hours and 54 to heat the water. The actual electrical energy used by the heat pump to do this would be approximately 2.9kWh
So length of time is the same but the draw is far less
 
Lupus said:
2kw element and 70 degrees.
Heating 150 liters of water from 20C to 70C with a 2kW element will take approximately 4 hours and 22 minutes and use approximately 8.72 kWh of energy.
AI calculations though.
Just for a check with 3kw
It will take approximately 2 hours and 54 minutes (174.3 minutes) to heat the water, consuming approximately 8.72 kWh of energy.
With a 3kw equivalent heat pump
It would take approximately 2 hours and 54 to heat the water. The actual electrical energy used by the heat pump to do this would be approximately 2.9kWh
So length of time is the same but the draw is far less
Click to expand...
And you have a 16kW inverter?
 
PCWARITM said:
What model of heat pump are you basing that on? I've never really dug into it, so keen to see.
Click to expand...
That's a 3kw equivalent, though the COP wasn't set if you use the common cop of 3 the time it takes drops to an hour
 
wingnut771 said:
Boobs lower ROI.
Click to expand...
Not really, being able to run things when there is no grid power, at night and early morning does.
Boobs are just things people with 5kw inverters use to show off. When you start going over 8kw it's very hard to keep a boob
 
Lupus said:
Not really, being able to run things when there is no grid power, at night and early morning does.
Boobs are just things people with 5kw inverters use to show off. When you start going over 8kw it's very hard to keep a boob
Click to expand...
It just grates my arse to see battery full at 1pm and solar takes a holiday. These people need a second 16kWh battery.
 
wingnut771 said:
It just grates my arse to see battery full at 1pm and solar takes a holiday. These people need a second 16kWh battery.
Click to expand...
A few people prefer it to be done by 11am. Also after 1pm you start getting diminishing results. So you'd need to ensure that what ever you use is not going to start using battery.
 
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