I had a set and got it all setup using the 12 volt system for the air pump. I used it but when I did it a lot the air pump would just pull a lot off the electrical (generator) system. So I pulled it off and went to a "Volo Air Horn" system . It is just as loud, has a varying tone and is no problem at all now. The draw is 4 amps when in use. otherwise it uses no amperage.
Normbc9
