Tips on reducing battery drain for IKEA Fyrtur Blinds paired with HE?

[david4]

My solution to the battery drain problem:

Power Supply for Ikea Fyrtur Shade - No Battery Required

I want to hardwire my IKEA blinds as soon as I get them. I will have 4 or 5 blinds connected to the same power supply. Which means I need an 8A or 10A 7,5VDC power supply. The only question is what gauge wire do I need to wire this up in series? Or are there a better way to do this? The wire length will be about 2m if that has to be taken into account.