DIY solar hot water system controller

[willlymac28]

I noticed on your web page that it does not show you selling a complete circuit as shown, I would like to purchase the excate circuit as shown, with the displays to show temps. Also since im am purchasing this for a project in school I would need the schematic, can you tell me if this is possible?

[paulpellicci]

...interesting....

[pathman2]

But it would not be frozen at 4 deg C, below 0 deg C is freezing. Am I right or am I right?

[Maxsonxxx]

I'm currently working on a solar thermal water heating system, I'm almost done with the mechanical hardware part.... How can you assist me with building a differential controller like yours? I suck at programming too :(

[shriramvenu]

do you have the schematics for this?

[jeffpicks]

All that on/off cycling can not be good for either the pump motor, or the relay contacts...

[iwantosavemoney]

this is cool what does it cost how much power to make it run it. is this like a reculating pump?

tha cheap guy

[easytreasure]

@iwantosavemoney The controller uses very little current, bur the pump uses more depending on how big it

is. The pump I use is 12 volt about 1.5 amps Google solarfriend to see the complete system.

[STARFIRESOLAR]

Pretty cool controller! But it is doing way too much cycling of and on for the temperature difference to be almost 30 degrees. Why is that?

[easytreasure]

Cycling time is adjustable to suit your setup

[jakubec]

Where can they be purchased? Do you sell them or sell plans to build them?

[easytreasure]

We sell them see our website Solarfriend

[aeroboy86]

Hello, great demonstration of your solar water heater controller, simple yet very effective. What type of temperature probes are you using? Is it a simple thermistor?

[easytreasure]

Hello, thank you. They are from Arizona Microchip

part no MCP9700A Low cost and easy to use. And reliable so far.