How to power 12V valve solenoid?

Hello,

I have no issues using an external battery for my Arduino UNO, however I do struggle finding a 12V powersupply unit for the 12V valve solenoid that is connected in the scheme using a relay.

PS. I need a 12V battery supply unit.

Any suggestions?

I do struggle finding a 12V powersupply unit

I find that hard to believe. When I Google "12 volt power supply" I get over a million results returned.

Firefiy: I do struggle finding a 12V powersupply unit ...

When you say power supply unit are you talking plug-in ones or an external battery?

Plug in 12v plug in wall-warts are to be had for about £5 or $8 from eBay (just be sure they won't burn your house down, some of those Far Eastern units can be a bit dodgy - sometimes better to pay more).

12v batteries are of course readily available - a small rechargeable li-ion or even a 'wet' gel-type motorcycle battery are generally available.

Perhaps you can detail your exact requirements more fully for better answers.