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hi, new to this site and after a little help with the electrics on my home build race van.
I want to run 240 volts from a genny via a hookup socket on the exterior to power a LCD TV, 800 watt microwave, 3 way fridge. this is also going to a Zig charger which will charge a 85 amp leisure battery which at present powers the 12 volt LED interior lighting and will run the 3 way fridge during transit.
Now I have just been given a 1000w 12/240 volt inverter and would like to hardwire it into the electrics from the leisure battery to power the tv/microwave and supply power to a twin 13 amp type socket but only for short bursts when the genny is off late at night and first thing in the morning.
now how do I switch from 240 volts inverted to 240 volts hook-up? Ideally i would like a 'ON/OFF/ON' 240 volt switch to switch between the 2 sources but cant find one, so if i just wire it all up without this switch will the power from the hookup go back to the inverter in a reverse direction and blow it up?? forgive me if this sound like a really stupid question as I know veryu little about the internal workings of such a device.
In simple terms you must wire in an isolation system. Also the 1000 watt inverter will not run a standard 800 watt microwave. Its power consumption is close to 1200 watt or more and its start up load even more.
You should go for 2000 watt inverter and at least 2 x 110 Amp hour batteries 3 would be better or you will kill your batteries very quickly.
Mine is wired through a manual changeover switch, 3 positions .off ,inverter, 240 incoming ( genny or EHU) it makes all the ring main live from the inverter, just be careful what you have plugged in
Loddy
______________________________________________________________ We are put on this earth not to weather the storm
but to learn to dance in the rain
No you could not do this with a simple on/off switch, and as you are dealing with mains voltage, safety is the primary concern.
It would probably be best via a proper change-over switch or a contactor for the switch-over, an earth leakage trip and/or mcb, but unless you are competent to carry this work out, you should leave it to someone who is.
No disrespect to you Leigh, or anyone else, but I am always wary about giving advice on electrical or gas work, when it is impossible to access someone's competence to carry out the work safely, or even legally.
______________________________________________________________ Michael. . . . . . When in doubt, try it anyway, and learn from your mistakes!
.......... I did - and I´m now yet another EX Marquis customer!
He who dies with the most toys is nonetheless - DEAD!
The way I overcame this problem is as follows
The mains hook up is wired to a 13amp socket fitted beside the Inverter. The motorhome electrics are wired through a caravan trip switch. The input lead to the trip switch is fitted with a 13amp plug which can be plugged into either the inverter or the 13amp socket that is wired to the electric hook up. When I use my generator I connect it to the electric hook up. If necessary you could wire the generator to a second 13amp socket. This way the 3 input connections are completely separate and the motorhome electrics can only be connected to 1 input source at a time. Safe, simple and cheap.
Using this system you can also power your motorhome from a normal 13amp extension cable if you don't have a proper hook up facility.
I'm not sure if this helps it not being a self build van but....
When we got our MH it had had 4 additional double sockets put in, but no inverter, so I disconnected 2 double sockets on one side of the van and wired them into the 600 inverter powered by 2 x 110ah batteries under the front seats.
It's a simple system which works, inverted one one sideof the van & EHU on the other, and no need for changeover switches.
I should add IMHO a 600w inverter is a bit useless really, not powerful enough and too powerful at the same time, I'd like to run a microwave of one, but don't really need that much power elsewhere, A genny would work but again don't need so much juice elsewhere, hence we do not have a microwave in the van, we did consider 12v microwaves, but hae yet to see a positive review.
Kev_n_liz
You need to be extra careful with your arrangement if you have EHU connected at the same time as the inverter. As the two AC supplies will not be in phase, you will potentially have 480volts between the two.
Others on here may be in a better position to advice on this
Kev_n_liz
You need to be extra careful with your arrangement if you have EHU connected at the same time as the inverter. As the two AC supplies will not be in phase, you will potentially have 480volts between the two.
Others on here may be in a better position to advice on this
Thanks Denisl.
Moi wrote:
so I disconnected 2 double sockets on one side of the van and wired them into the 600 inverter powered by 2 x 110ah batteries under the front seats.
I did say disconnected, they are not on the same cable in any way, totally isolated from the EHU.
They may be isolated from each other but if you have both circuits powered at the same time there could be a voltage between the two of 480 volts.
I think an electrician would be worried by that.
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