What you must know B/4 you buy an inverter (INVERTER BULLET PROOF)
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DC Power Inverter
A DC power inverter converts DC power from your renewable energy source into the AC power needed for powering the appliances in your home. Inverters are grouped in two major categories: those designed to convert solar energy directly into AC without the use of storage batteries, and those designed to provide power from batteries, with the batteries being charged by any number of sources.

What types of power inverters are there?
There are stand-alone (off-grid) inverters and grid interactive (grid tie) inverters. Among the stand-alone inverters, there are square wave inverters, modified sine (square) wave inverters and pure sine wave inverters.

What can be run on an inverter?
Inverters can run typical AC appliances like blenders, hair dryers, air conditional, microwave ovens, computers, even washing machines.

Are there any appliances that cannot be run on an inverter?
As a general principle you can connect almost any appliance to a power inverter, assuming it has been properly sized. But because of the high capital cost of renewable energy products like solar panels, appliances that use a very large amount of power, such as electric stoves and ovens, air conditioners and electric clothes dryers, are usually excluded from off-the grid systems. (No items need to be excluded if you are on a grid-tie system.) If such items are required on an off-grid system, then a back-up system such as a generator is usually suggested. But solar power is cost effective for running most other appliances in an off-grid house. Lighting, TV, computer, washing machine, VCR, efficient refrigerators, ceiling fans, FAX, bread oven, microwave oven, coffee maker, toaster, blender, sewing machine etc. are often run off a solar system.

Choosing a Power Inverter
Selecting an inverter to meet your needs is a major decision. We tend to become very dependent on our power sources. In many cases, an entire home or business, including lights, refrigerator, TV, computer and other expensive equipment may be powered from it. In selecting an inverter to meet your needs, it is important to look at the type of loads you have - their wattage, power factor, continuous and surge power requirements.

Some of the things to consider:

WATTAGE: This is usually the first and often the only thing that an uninformed person may look at. Power inverters are usually given a continuous, intermittent (30 minute), and surge rating. Be wary of inverter specifications that don't give you such ratings. Some manufacturers list the surge rating in huge print and the continuous rating in the fine print, which is very misleading. Large power inverters will be less efficient on very small loads than smaller inverters. Lightweight inverters with no transformer generally do not have much surge ability.

FREQUENCY AND DISTORTION: Good inverters typically hold their frequency to within .01% and have less than 4% harmonic distortion.

MINIMUM INPUT CURRENT: How much power does the inverter use if it is on 'run' mode to run or detect a very small load? A good inverter might only use 0.6 Amps.

INPUT VOLTAGE: A battery on a solar system may typically vary from as low as perhaps 10 volts up to 15.5 volts when the solar is 'equalizing'. A good inverter will generally operate between 8 to 16 volts.

OUTPUT VOLTAGE: Will it maintain its AC voltage to 3-5%?

EFFICIENCY: How efficient is the inverter? Does the specification just give you one 'peak efficiency' or does it show you a graph with small 50-100 watt loads up to its rated power?

SAFETY: Does the inverter meet all relevant safety standards?

DISPLAYS: Does the inverter identify common faults such as low and high battery, overload, over temperature, etc?

WARRANTY: Does it have guarantee?

Modified Sine Wave vs. True Sine Wave
There are two types of waveforms available from a high-quality power inverter. These are the so-called "modified sine wave" and the "true sine wave".
A modified sine wave looks more like a square wave that has been time shifted in order to produce the energy content and waveform which is found in power produced by the utility
Company. Its frequency and voltage is rock solid which prevents the brownouts and spikes typically seen with utility company power. Most appliances such as TVs, Lighting, stereos, computers, inkjet printers and power tools run find on modified sine wave power.
About the only appliances that you may see a problem with are some Laser printers and some of the cheaper types of battery powered tool chargers. In fact 95% of the inverters in RV's today are of the modified sine wave type.

The second type of inverter is known as a pure sine wave and you guessed it, it produces power that is exactly like the power which is produced by the utility company without the spikes and brownouts of course. This type of inverter produces pure sine waves much the same way as the two different technologies mentioned above, but at the cost of some efficiency loss and at a much higher price. In fact most pure sine wave inverters are typically priced at least 75% higher than their modified sine wave counterparts and in some cases do not have as high of a surge capability as do modified sine wave units.

We recommends both modified sine wave and true sine wave power inverter for most applications, both are extremely good at their capacity, but it largely depend on the manufacturer competency and how you manage them.

pls what do you recommend for a cyber cafe with fifteen 17 inch flat screen computer systems, wiith one laser jet printer, a modem, 3 routers, one ceiling fan, & 2 fluorescent bulbs and a 14 inch tv? I would want the inverter to serve at least, between 24 - 48 hrs after NEPA failure. And how much would it cost. i live in kano, how do you work out the delivery and installation. i think i'm impressed with your product and support on your website. thanks.

sorry for taking too long to reply you, you have to calculate all the cafe gargets , befor you can decide the size of the inverter.

thanks

I live in the countryside and in our community often have power outages. For a more comfortable life I decided to buy Frequency Inverters. This device will allow you not to worry if you do not have electricity. They come in different capacities and different types. You just need to consult and find out which option is right for you.