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A project log for Electric Water Heater controler

To Control an electric water heater to only use the surplus power from my 3KW PV array

saabmanSaabman 04/30/2016 at 09:090 Comments

the basic concept for this project is going to need someway to determine the amount of energy being produced by my 3kw solar system and also how much energy I am currently using.

The difference is going to be allocated to the hotwater heater.

The hotwater heater is a 20litre unit under the kitchen sink just for supplying hot water for washing dishes.

Solar generation data is currently provided by the fronius inverter and data uploaded to pvoutput.org every 15mins or so. Current data can be accessed directly from the inverter via Ethernet.

I decided to keep things simple made use of the excellent work by the open energy monitor guys https://openenergymonitor.org/emon/ and built a 4 channel current reading version on an Arduino Uno with an ethernet shield.

4 current inputs required - 1 for each Phase of consumption and 1 for solar generation.

The the sktech produces a basic WEB page which can be accessed via web bowser from within my home network.

The resulting page gives just the basic information to getthe job done.

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