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is there a sample on building a 12v dc to a 220 ac?

matthews_30
matthews_30 asked
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Last Modified: 2010-05-18
i need to build somethig like that to test it in a field house, please help me.

thanks a lot,

matt.
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Commented:
Inverters are so cheap now it would be easier, and safer to buy one

Author

Commented:
i am in chile and cannot find some with 1000w 12vDC IN to 220vAC Out, please help
wyliecoyoteukIT director
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Commented:
A 1000W inverter would cost a fair bit, I think.

Googled for one, found it at £195 (about $315). weighs 3.3.Kilos

Are you sure that you need that much power? you will need a seriously large battery.
A petrol generator might be a better bet.(and cost about the same)

there is a 100v design here http://www.interq.or.jp/japan/se-inoue/e_ckt8.htm -you could just use a 12/ 220V transformer but it looks pretty low output.
rid

Commented:
1000W from 12 V requires around 85 Amps. A brand new 60 Ah fully charged auto battery will give you this for say 20 minutes, before the voltage begins to drop too low. As has been said, inverters in this power range are rare and expensive. Re-prioritize your power needs or get a petrol generator. Unless, of course, you have some really big batteries lying around. In fact, if you could up the primary voltage to 24V, you'd be much better off as your current drain would be halved and that would be a relief for the batteries.
/RID

Author

Commented:
you are very clear on it 'rid', so maybe some of you can understand the project and maybe suggest any idea...

well, mi father in law has a terrain in a field, so there are not how to get energy, and petroleum engine is much expensive and difficult to transport.

i have to use 1 television, 1 pc computer, and 4 lights of 100 watts.

i am trying to use solar panels to charge car batteries and the car batteries to convert to 220v ac to use the pc, tv and lights.

did some of you any idea on this?

thanks in advance.
rid

Commented:
I can't give you a drawing but perhaps some thoughts:

Getting 1000W from a 12 V source is problematic. The very high current calls for large batteries (>100Ah Lead-Acid) and hefty cabling. If you can up the source voltage to 24, much is gained as you could use 2 X standard 12V batteries instead of one uncommon, expensive type and more moderate cabling. NiFe batteries are better in the long run, but more expensive when you buy them.

It may be easier to get/build an inverter for each appliance; one for PC, one for TV set, as those could be standard types that can be had at reasonable prices from many vendors. Lights don't have to be 220V, you know. Look at prices for 12V (or 24V) lamps (car/truck headlight lamps or similar) and see what solution is most cost-effective.

If you want to build something yourself, take a look at places that sell old computer stuff. If they have any old UPS's, grab them. The batteries may be shot, but the inverters surely aren't (unless they've burnt them out) and they'll run on any source providing the correct voltage (same as the built-in battery). The output voltage should be nice to computers and such (not too rough waveform).
/RID
wyliecoyoteukIT director
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Commented:
A compact petrol generator would be smaller and lighter than the batteries and solar panels you would need, and easier to transport.
Also, building an inverter to handle that current would be difficult and dangerous if you don`t know what you are doing.
Using solar panels, the batteries would probably need a day`s good charge at least, to give you 20 mins power.
Another thought may be a wind-driven  generator, they are quite easy to build from old motors.
http://www.awea.org/faq/brew/hp-brew2.htm
Rid`s suggestion about the lights would save you a lot of trouble.

Author

Commented:
well so, what kind of petroleum generator may i use for? those that people called 'engines'?

please suggest me something and if you can tell how do y use it, for example, if i get 220vDC inmediatly or do i have to do something else.

many, many thanks!

matt
wyliecoyoteukIT director
CERTIFIED EXPERT

Commented:
You can get small petrol or deisel generators that use a small (50cc or so ) engine and will output 220vA C.

http://www.bullnet.co.uk/shops/test/1000_watt_four_stroke_petrol_gen.htm

Is an example. I would not know how available they are in Chile.
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