Blowers

[Tony B]

I have twin 270 Crusader engines and I usually run one at a time.
I do this for my own reasons and so I don't want this thread hijacked into the why of it all. I just do. Anyway, my question is two fold:

1). Can I run the blowers off my house batteries with the alternator from one engine keeping them charged? I'm not sure right now where they are powered from right now. I don't even know how much power they consume.

2). I usually leave the blowers on all the time I am running the boat. Some people think it is odd. I thought I was supposed to with gas engines. Am I?

Thanks in advance

[HopCar]

I don't see any reason to run the blowers after the engine has been started. Your big old gas engine is going to suck in and blow out far more air than the typical 3 or 4 inch marine blower.