# 12volt to 240 inverter

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#### Chezza

##### New Member
G'day,
we have a 240v TV in our caravan, also a satelite dish and 240v set top box. We want to be able to run them on 12 volt battery power,(for a short time at least) what size inverter do we need to run them (at the same time).
I am not into electrics at all so I hope someone can help. I have seen 3 different sizes at the shop,what size is best please.

#### Nigel Goodwin

##### Super Moderator
You need to decide the power consumption of each item, but a 500W or 1000W should be more than enough.

You do need to be VERY aware of the poor wiring practices in caravans - in my experience it's quite common that the wiring is far too thin and far too long, and often won't power a 12V TV due to the excessive voltage drop across the cable.

#### colin55

##### Well-Known Member
You will have to have thick leads connected directly to the battery and put the inverter as close to the battery as possible. The output of the inverter can then have long leads to the appliances. Don't use the caravan 12v wiring AT ALL.

#### Chezza

##### New Member
Thanks for that, now, to work out what my appliances use. Also, is it possible to "overkill" on the size of the inverter, (get a 1000w when I only need a 500w) and if so would that damage my appliances, or does it just work away no problems, and have the rest of the power for maybe another appliance at a later date. (if you know what I mean) ? thanks again Chezza

#### blueroomelectronics

##### Well-Known Member
The inverter is rated for it's maximum power output, it'll work fine with devices that need less.

#### colin55

150 watt inverters are only about $60.00 This will be sufficient for a small TV and set-top box. #### Sceadwian ##### Banned You should be more worried about getting too small of an Inverter rather than to large, I'd price a few unit of various sizes and work out the price/watt ratio and by the one that had the cheapest per watt price. You could buy cheaper than this but you're getting less device for your money, and you could buy more, but only if you really need the extra power. #### Nigel Goodwin ##### Super Moderator Most Helpful Member 150 watt inverters are only about$60.00
This will be sufficient for a small TV and set-top box.
But may well not start up with the high initial surge current, which is why I suggested 500W.

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