If the garage already has a supply, and running a new one is going to be disruptive, then the first job is to figure out the capacity of that existing supply.
Call a local spark out and get him to check out what is currently feeding the garage, cable size/type, protective devices etc. Or look yourself if your that way inclined. You can always post some images up here etc.
From there, you can figure out what capacity the cable has, and how much current you can draw. I would imagine even the most basic garage supply should be able to handle a 16A charger, and many of the common units can be adjusted down from the normal 32A.
A typical basic garage supply done in 2.5mm SWA for instance can potentially supply in excess of 30A depending on various factors. Likely plenty of scope to install a 20A charger and have some left over for the lights and sockets. Even if they've really skimped and done 1.5mm SWA, its probably still able to carry 20A+
Many of the big chargepoint installers dont seem that flexible or willing to think outside the box. They have a standard blueprint they want to apply to every job.
Call a local spark out and get him to check out what is currently feeding the garage, cable size/type, protective devices etc. Or look yourself if your that way inclined. You can always post some images up here etc.
From there, you can figure out what capacity the cable has, and how much current you can draw. I would imagine even the most basic garage supply should be able to handle a 16A charger, and many of the common units can be adjusted down from the normal 32A.
A typical basic garage supply done in 2.5mm SWA for instance can potentially supply in excess of 30A depending on various factors. Likely plenty of scope to install a 20A charger and have some left over for the lights and sockets. Even if they've really skimped and done 1.5mm SWA, its probably still able to carry 20A+
Many of the big chargepoint installers dont seem that flexible or willing to think outside the box. They have a standard blueprint they want to apply to every job.