need to run an extension cord about 75 yds to charge my boat out in the middle of nowhere. will it work? will i blow something up?

oh and obviously this is going to take 4-5 cords.

Get you some heavy duty 3 wire on a bundle and just put the extension cords mail and female parts on it.

I use 100 footer works fine with a four bank charger.

12-2 romex and do like Tim said.. if you can hold it off the ground that'll help at that distance.
Use some wood stakes, the ground will suck the juice out for some reason.
75 yds x 3 = 225 foot

ya i use 2 extra heavy duty and it goes over 100 footno problem

Thats the right answer. Gonna cost ya tho.

Good advice from Steel and I have done it without it off the ground

I have a 500' one made up but with the name southtexasbassin your probably to far away from me for it to be any help to ya. Your welcome to use it if you want to tho.

where are you lmh? gonna be using it in east texas

Just outside of Longview. Call me if you want 903-576-4111.

12-2 romex is the optimum thing to do but expensive and you will end up with this hard to roll, huge mess of wire each time you put it up that will cover the bed of your truck. Even a 15 amp 3 bank charger actually draws few amps. Remember the 12v OUTPUT is 45 amps(15x3). The 110v draw is surprisingly small. Check your battery chargers INPUT draw. You will be fine with a decent 100' medium/heavy duty extension cord. You can get a 100' 12ga extension cord. A little heavy, kind of expensive but will do MORE then you need and it rolls up fairly small. Price them at Home Depot, Lowes...

12ga. 100' cords will be pushing $100 ea.

If you have a heavy duty one with good insulation you should be able to do it. But like 361V said I would buy a new 100 foot cord. In my experience multiple cords can cause problems

He needs to go 75 yards not feet.