I have a budget power board on a single wall socket with a budget 1 meter extension cord to another power board which I have a portable air conditioner plugged into. I'm worried the extension cord might not be heavy duty enough and or length of run might be causing the voltage to dropping with the air con load. All that runs off of the same wall outlet is a digital clock, occasionally a pedestal fan and a 15W lamp. I'm not an electrician so not exactly sure what sort of supply the air con should be getting. Should I be using a heavy duty extension cord in place of the budget one to reduce any voltage drop? Should I use higher quality power boards in place of the budget ones? Ideally I should get another power point put in but if anyone can suggest something for the interim that would be great.

Edit: If I am reading this correctly the badge on the air con says AC Input: Cooling: 1460W - 6.4 A, Heating: 1270W - 5.6 A. That means a 10A extension and power board should handle the load but what about voltage drop with cable length?