Fuse size - help please (1 Viewer)

Apr 13, 2012
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18,594
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20,541
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Mobilvetta Euroyacht
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1996, then break 'til 2011
I have fitted a Waeco 500w inverter to my van, through a fuse holder but not sure size of fuse to use.
Spec for inverter is:
12v input - 220 output
continuous power 500w peak power 1000w
Help please
 

JeanLuc

Free Member
Nov 17, 2008
3,304
2,199
Warwickshire
Funster No
4,952
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Hymer B630 Star-Line
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Since 2007
The fuse is there to protect the cable and ideally you should use one that is rated a bit higher than the likely current. If the fuse is a lot bigger than it needs to be, it will only fail when things get dire.

The formula you need to apply is amps = watts/volts.
So for your inverter the rated maximum current will be 500/12 = 42 amps
but the maximum peak surge (depending on what you power with the inverter) could be 1000/12 = 83 amps.

If you are unlikely ever to draw more than 500 watts from the inverter, a 50 amp fuse should suffice. If however, you plan to use it's surge capability (albeit only for a few seconds) you might need a 100 amp fuse. I presume the cables you have used are adequate for the current being drawn? If in doubt, the attached may be of use (it's from Sterling Power Products).
 

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