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inverters
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userfred22
Posted: 22 September 2015 11:15 PM
Subject: inverters
 
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I have got a mobility scooter which is powered by 2 x 12v. 12AH batteries. there is an on board charger which plugs straight into the mains.

Whilst driving around I want to plug the charger into an inverter to keep the batteries topped up.

What sized inverter do I need to do the job.

The batteries will never be flat so it is only a trickle charge I want

Thanks

Fred
userDerek Uzzell
Posted: 23 September 2015 7:37 AM
Subject: RE: inverters
 


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Location: MODERATOR - 2015 Rapido 640F LHD 2.3ltr 150bhp


This earlier discussion may be helpful

http://forums.outandaboutlive.co.uk/forums/Motorhomes/Hints-and-Tips/Inverter-advice-please/37106/
userfred22
Posted: 23 September 2015 2:58 PM
Subject: RE: inverters
 
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Hi
Thanks Derek,
I did a search of the forum before putting on my post but I did,t find the one you have.
Fred
userfred22
Posted: 4 October 2015 4:37 PM
Subject: RE: inverters
 
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Hi,
Having looked and bid on some inverters there is just one thing that bothers me.

Some of the inverters, but not all, state (or words to the same) "for your protection an earth screw is provided so that you can earth the unit".

I have assumed that this earth screw is on the "mains side" of the inverter and can understand that you can connect it to the chassis if you are in the motorhome on electrics but, what do you attach it to if you are in the car? ( all metal surfaces will already be carrying a negative charge).

Am I missing something.

I have not yet purchased a unit.
userCharles
Posted: 4 October 2015 6:57 PM
Subject: RE: inverters
 
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Location: Derbyshire Elddis accordo 105


The earthing point is for if you are installing it as part of a TN system (Terra Neutral) where one of the output lines from the inverter is connected to the earthing point on the casing and also onto a 2m copper rod driveninto the ground. This is how our homes are protected where all metals are earth bonded to each other and are at near Neutral potential, so if live touches any equipment case or any metalwork the current flow blows the fuse. Neutral is connected to earth at the substation.

Your inverter has a floating earth and acts as an isolated supply. It is perfectly safe to use with no modifications to the earth.
userfred22
Posted: 5 October 2015 12:06 AM
Subject: RE: inverters
 
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Hi Charles,

Many thanks, I was beginning to worry

Fred
userfred22
Posted: 16 October 2015 11:28 PM
Subject: RE: inverters
 
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Hi,
I have now purchased an inverter and the instruction manual states that the earth should be connected to the vehicle chassis

Fred
userCharles
Posted: 16 October 2015 11:48 PM
Subject: RE: inverters
 
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Location: Derbyshire Elddis accordo 105


It's probably the negative supply (ground). nothing to do with the output.
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