Ideal inverter wattage from 30A fused circuit?

[bloc]

Hello,

I’m looking at repurposing a circuit to the rear of my cruiser that is fused at 30A for an inverter. I do not have particularly robust needs from it, mostly running a 100W drone battery charger (that overpowers the existing 100W plug back there), but I figure I’ll put whatever I can safely support back there while I’m at it.

Thoughts?

Thanks!

 

[e9999]

First thing I would do is check that the wiring is also good for 30A, because that is not a given unless you put it in yourself or checked earlier. If it is, then your 100W load should be fine. If not, I'd adjust the fuse accordingly.

 

[MCtree]

First thing I would do is check that the wiring is also good for 30A, because that is not a given unless you put it in yourself or checked earlier. If it is, then your 100W load should be fine. If not, I'd adjust the fuse accordingly.

Agreed.
But it does seem like you only want less than 9amps back there. So as long as you have 10awg wire, you should be okay. (After you adjust the fuse)

 

[e9999]

Having a solid 30A in the back is great. It won't support a biggish inverter, but you can do pretty fast charging of a house battery with that much.
And if you don't have one yet, look into a fridge, you won't be able to live without one of those after you used it once. (Not that you need 30A for one.)

 

[LandLocked93]

100W@12V is about 9amps direct, not including charger current draw.
So that "plug back there" is probably fused for 10 amps.
Are you running a new circuit, or just re-fusing the factory circuit with a 30amp fuse?
I don't recommend the latter.