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Hard wiring inverter

For all things Electrical.

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Posts: 169
Joined: Thu May 15, 2008 3:42 pm
Location: Central Coast, NSW, Australia

Hard wiring inverter

Post by SLASH »

Hi guys, i have a 300w inverter wich i would like to hard wire to my auxilary battery. Should i be fitting an in line fuse to it and should i run the earth back to the battery? Also if im fitting a 12v cigerette plug of that battery do i have to run that through a relay or is the in line fuse all i need? Cheers Loz.
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Post by chimpboy »

Fuse - yes.
Earth back to battery - debatable but I wouldn't bother.
Relay - no.
This is not legal advice.
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Posts: 169
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Location: Central Coast, NSW, Australia

Post by SLASH »

Thanx man. What size fuse would you recomend for the inverter? Cheers Loz.
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Post by chimpboy »

Was there a fuse in the wiring that came with it?

I am guessing a 25A or a 30A for a 300W inverter. But I think mine came with a fuse; I would use whatever size that was.
This is not legal advice.
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Joined: Thu May 15, 2008 3:42 pm
Location: Central Coast, NSW, Australia

Post by SLASH »

Mate i couldnt tell you coz its a few years old. Ive just been pluggin it in the cigerette socket. It may have come with one with the aligator clips but i may have tossed it. Ill stick with what you said,it should be fine. Thanx for your help mate. Cheers Loz.
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Post by 43som »

the invertor should have a fuse in it. use the same size.
Mine (350watt) has a 30 amp at the battery.
I do know invertors suffer from voltage loss on the cable.
the further away from the battery the invertor is, the bigger the cable. again start at the same size cable as what came with it (aligator clips).
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Post by JustinW »

for inverter fusing use this -

surge wattage divided by nominal voltage = approx fuse size.

Most 300watt inverters have a surge wattage of 600w, so....

600/12 = 50amp, anything under 50amp will be fine.

If using an inline fuse, use something like a midi or mega fuse, as the standard auto or maxi blade fuses handle amperages over about 30amp poorly causing voltage drop.

cheers,
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Location: Central Coast, NSW, Australia

Post by SLASH »

Thanx for the info guys. Cheers Loz.
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Post by stuee »

Fuse for the cable size you are using not for the inverter. As mentioned here before, fuses are to prevent the cable from overheating and catching fire. They are often don't act quickly enough to protect electrical devices and if they do the manufacturer will usually fit one on board the device.

So don't use 10amp rated cable then fuse with a 30amp fuse. Alternatively if you are using 50amp rated cable then you can use any size fuse up to 50amps.
-Scott- wrote:Isn't it a bit early in the day to be pissed? :finger:
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