Inverters

What Is An Inverter?

An Inverter converts 12 or 24VDC to 240VAC. They are used to run 240V appliances from car batteries or from Solar Power Systems.

They range from 140W models (to run a small TV), to 4000W models (to run entire household). They can be used to run Computers, Stereos, Videos, Kitchen Appliances, Power Tools and Fridge/Freezers, providing the appliances power requirements do not exceed the Inverter's rating.

Types Of Inverters.

There are basically 2 types of inverters.

SINEWAVE inverters produce 240VAC in exactly the same waveform as mains power. They should run all appliances without any problems.

MODIFIED SQUARE WAVE inverters produce a wave form that is slightly different than mains power, some sensitive electronic equipment may not run on these inverters, or run badly. For example some stereos may hum, some TV's may have lines across the screen.
However these inverters are a lot cheaper and most appliances will run without any problems.

12 Or 24 Volts?

If you are running your inverter from your car/boat battery then you will use a 12V inverter. If you were running the inverter from a solar or generator system then you would use a 12V inverter/battery up to around 2000W, if you need a bigger inverter you would choose a 24V system. This is to reduce the load on the wiring between the battery and the inverter. At 2400W a 12V inverter would be drawing 200A from the battery!

Battery Size.

Inverters draw a lot of amps when running large appliances. Therefore, the battery system must be big enough to provide power without damaging themselves. In a vehicle the engine can be left running to provide constant charge to the battery while running appliances. Even so, a decent size battery will last longer. When using deep cycle batteries in a solar system the A/H rating should be at least 5 times the Amps been drawn by the inverter/appliance, preferably 10 times. So a 240W inverter (20A) should use a 100A/H battery at least.

Wiring.

The inverter should be as close to the battery as possible. Wire size between battery and inverter should be large diameter to prevent voltage drop. A fuse capable of the 1/2 hour rating of the inverter should be used. Connections should be secure. On the 240V side, all wiring should be up to mains standard.

Safety.

Inverters produce 240 VAC, which can give a lethal shock. Take the same precautions you would with mains power.

Which Inverter Should I Use?

Size, price and waveform are probably the main considerations. Make sure the inverter will handle the biggest load you want to run. Remember to allow for the starting surge on motors and RV's. If you are running sensitive electronics then you will need a sinewave inverter, otherwise modified sinewaves are better value. Here is a list of most of the inverters I can supply. While it may seem long at first, many of the inverters are quite similar. I have brochures available for all of these inverters. If you have any questions please ring or write with details of your requirements and I will recommend a suitable inverter.