Brilliant. Thanks for all the info. I'll fit the biggest i can. It puts me over my power plant capacity but I'll keep it off until i need it. I'm a careful pilot but you never know whats gonna happen when I'm a few thousand lightyears away.
Thanks
What you will find is that you will really want the best grade one (A grade over E grade every time) as the higher the grade the more ammo and the more ammo the more repairs...
If you are going to take a super long exploration trip (read this as longer than 3 - 6 months) then you might want 2 AFMU's, one small and one larger one, that way they can repair each other...
I am not too far from beagle point on my DWE journey and I am currently at 83% on my AFMU (I only brought 1 with me) and by the time I reach beagle point I will have been exploring for a bit over 3 months... and then the return journey I suspect will take much much longer, maybe another 5 - 6 months... so I am kinda kicking myself for not bringing a second AFMU.
One secret with AFMU modules - turn them off when not in use... saves a shedload of power.
As others have said, do not repair FSD or Thrusters while in SC, drop to normal space or when you are landed on a planet and do it then.
Another tip, do not repair your shields just before decending to land on a planet unless you prepare to let them recharge before landing.
Always check the planets gravity before attempting to land on them and be careful when landing on planets over 2G as it is really easy to land too hard and take substantial hull damage, I had to head back early on my voyage due to just that problem with only a few percent hull left...