JA5ONS

As you may know, i have a reasonable power consuming electronics system in my car (HU, Amp, LCD, Computer, TV tuner, Inverter) along with a few other things i can plug into the system, all isolated to run off a second battery when the car is off.

My question, is there a way, that i can have a 240v plug, so when i have access to a outlet, i can plug it in and charge the battery, WITHOUT disconnecting the battery/open up the water plugs of the battery.

I am sick of flattening the battery well working on it in the shed type thing, and more long term, if i go away, roll out the swag at a caravan park (powered site) and leave the music playing for ages, and not having to bother about starting up the car and running it for ages to keep charge in the second battery.

I always thought, simple battery charger, however, my understanding is that when charging, the battery should be disconnected, as well as the water plugs opened.

Ideally, i want to have this device(whatever it is) next to the second battery under the tray, permanently wired to the battery, and i can set up a little 240v male plug (like those on the sides of caravans) in the tray, so i can plug a lead in, and away we go, no need for taking out 20 screws, disconnecting the battery, not been able to use the system until its charged, bla bla bla.

Any ideas would be greatly appreciated.

PS. for any sparkys, what should i do in terms of earthing, im a big fan of proper earths when playing with 240v, should i have a nice little spike that i hit into the ground when im parked , with a cable attached to the body? or is that un-needed?

cheers.

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