240vac soldering iron on an inverter

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T1 Terry
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240vac soldering iron on an inverter

Post by T1 Terry »

Saw something on that other forum where someone was asking about using a soldering iron on an inverter. If the inverter has an earth to the vehicle body then there will be a battery voltage short across the tip when ever you try to solder a live positive connection. The reason is the soldering iron tip is connected to the earth wire and if that is connected to the body some where further down the wiring harness, so is the battery negative. The nice fine tip on the soldering iron doesn't last very long when it pulls an arc across the tip :lol:

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Re: 240vac soldering iron on an inverter

Post by supersparky »

It is a bit of a catch 22 isn't it. Another good reason to use a gas powered soldering iron, or a butane heating torch.
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Re: 240vac soldering iron on an inverter

Post by dapope »

I have a little battery powered one. Jaycar. Does the job
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Re: 240vac soldering iron on an inverter

Post by Toolman »

Who the Hell solders a live wire :?: :roll:
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Re: 240vac soldering iron on an inverter

Post by Peter and Sandra »

They only do it once ;-))
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Re: 240vac soldering iron on an inverter

Post by bagmaker »

so I am leaning on the bus body, about to feed solder into the wire, inverter driven iron in other hand- what happens? Shock time?

I actually withdrew myself from the exact same scenario last week as I wasnt sure and had a mains option, it just didnt sit right with me, trying to solder a big lug to a battery cable. Interesting
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Re: 240vac soldering iron on an inverter

Post by BruceS »

The wire isn't 'live' in the sense of 240v but it is on the inverter input voltage.
I had a 48v inverter & Terry will tell you what happened to the copper end of the soldering iron!!!
Try it & find out?
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Re: 240vac soldering iron on an inverter

Post by jon_d »

Who has an inverter where the neutral is tied to earth? Most are isolated.
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Re: 240vac soldering iron on an inverter

Post by bagmaker »

I am pretty sure all mine are linked to earth
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Re: 240vac soldering iron on an inverter

Post by jon_d »

Get your licensed electrician to test it - with everything turned off. (and double checked and tripled checked that everything is off.)

Measure the DC resistance between earth and neutral when:

1. the power cord is removed from the bus to mains AND
2. the change over switch is switched to the inverter.

(Being a DC measurement across a transformer, you can measure earth to active too.)


Wayne, if your sparkie has done his job properly, it should be switched in under certain conditions. It's documented in the standards.... but many don't do it.


Just a reminder this forum is open so be careful what you post about electricity. sometimes you need to speak generally and not give definitive advice.

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