Power Inverter (1 Viewer)

[Ninovan]

Could anybody give some advice please? I have just bought a 500w pure sine wave inverter for basically charging laptop, bike batteries, wife's hair staighteners , etc. Nothing major. I want eventually to wire it up semi permanently & connect up with a plug from the 240 outlet to the back of a socket I can mount on the outside of an adjacent cupboard, about a 1.5 metre cable run. It has 2x 30A fuses built in already. Should I wire in another fuse between it and the battery & if so what rating? 500w (@240v) from 12v means a 42A fuse or have I got it wrong? Just seems a bit excessive . Thanks all.

 

[SomeoneElse]

Point 1: Fuses are there to protect against fault situations, they shouldn't blow under normal load.
Point 2: Inverters are inefficient devices therefore a good rule of thumb is to allow 1Amp for each 10W of output power. You should be thinking of a 50A fuse as a minimu, situated near the battery.
A 60A fuse like this in a suitable holder would be fine.
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