T i m wrote:

A mate gave me the 12V 7A laptop type PSU a good while back but I
doubt it is a good one or able to maintain 7A. I might rig up a feed
using my variable bench PSU and see what it actually draws worst-case
and get something that can cope with that easily.

Distress purchase if you need one before the world gets back to normal,
and can measure that 5A would suffice?

http://maplin.co.uk/p/psu-n63jn