It will work but is frowned upon and risks damage to the car or the charger. I was going to include the timer but that particular model looks to be capable of handling the load, which some aren't.

 

Hi, if you do a search on here about using timers you will find some interesting answers.

https://www.speakev.com/threads/hyopthetical-timed-granny-charging-question.186605/?post_id=3650652#post-3650652

 

Good advice given in the link provided by Harry6.

There is also a difference between a power cut and using a timer switch. With a power cut the house and street are still connected in parallel to the car so any inductive 'flyback' is dumped into the house electrics and also the street. Which is why I've fitted a 40kA surge protector to my CU.

With a timer switch the only place for the inductive flyback to go is into the OBC itself and it may or may not sustain fatal damage.

 

The Corsa already has issues with a flakey Onboard Charger (OBC).
using a timer to simply cut power in the way you plan to use is outside the specs or how things need to be done and might give the manufacturer ammunition to sidestep replacing the OBC under warranty. Cutting the power in that way will lead to failure.

A mistake costing £3000 is quite a costly one so worth reading up on.

Gaz

 

Timers are fine to turn on the granny lead.
Just make sure they will not turn off whilst the car is still charging.
Suddenly breaking a 10 amp current will lead to spikes on the mains with the potential to damage the granny charger or the cars OBC.

Cars are designed to shutdown charging relatively slowly to prevent spikes happening.

 

Dont

 

You can get a granny charger with a built in timer, with reduced current also: Pardon our interruption...

That is prefereable if you are leaving a high current device on for hours.