building a light-sensitive power switch

Hi all,

I just installed solar panels and was looking for plugs/timers that would allow to only turn on given power plugs if there is enough sunlight to feed some power-hungry appliances.

I am confident I can work out the logic but where i am not sure is what kind of hardware I need to get to controle with that arduino sensor/timer box to convert that logic into a system that would support switching power on/off on a 240v AC/15amps current line (the items I need to control are two 900W motors for pool pumps and a 1KW heatpump).

Thanks for your help :slight_smile:

Cheers,
Gaetano.

Solid state relays can handle very large AC loads, and in most cases can be switched on and off directly by an Arduino output.

Example: http://www.ebay.com/itm/3-Crydom-D2410-Solid-State-Relays-240VAC-10A-3-32VDC/221614777905

Thanks mate! does that kind of relay heat up much? could it be enclosed in a HW enclosure for Arduino like this one: http://www.ebay.com/itm/like/231092989049?lpid=82 ?

Cheers,
Gaetano.

You might need a heat sink attached to the SSR, depending on the load.