fred22 Posted September 22, 2015 Share Posted September 22, 2015 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 Link to comment Share on other sites More sharing options...
Derek Uzzell Posted September 23, 2015 Share Posted September 23, 2015 This earlier discussion may be helpful http://forums.outandaboutlive.co.uk/forums/Motorhomes/Hints-and-Tips/Inverter-advice-please/37106/ Link to comment Share on other sites More sharing options...
fred22 Posted September 23, 2015 Author Share Posted September 23, 2015 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 Link to comment Share on other sites More sharing options...
fred22 Posted October 4, 2015 Author Share Posted October 4, 2015 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. Link to comment Share on other sites More sharing options...
Charles Posted October 4, 2015 Share Posted October 4, 2015 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. Link to comment Share on other sites More sharing options...
fred22 Posted October 5, 2015 Author Share Posted October 5, 2015 Hi Charles, Many thanks, I was beginning to worry Fred Link to comment Share on other sites More sharing options...
fred22 Posted October 16, 2015 Author Share Posted October 16, 2015 Hi, I have now purchased an inverter and the instruction manual states that the earth should be connected to the vehicle chassis Fred Link to comment Share on other sites More sharing options...
Charles Posted October 16, 2015 Share Posted October 16, 2015 It's probably the negative supply (ground). nothing to do with the output. Link to comment Share on other sites More sharing options...
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