The type and size of inverter necessary depends on your application.
To determine this you must first calculate the maximum amount
of load you will be running on the inverter at one time.
There are basically four size ranges of inverters. The first
is 50-300 watts; these are small portable inverters. These inverters are ideal
for laptops, small lights and other minimal draw AC loads.
The next size range is 300-800 watts. These are also somewhat
portable and still have the outlets on the front of the inverter. This size
inverter is good for small microwaves and other small appliances.
The third range is from 800-2000 watts. These units usually have
battery chargers built into them. Your can recharge your batteries with utility
power or generator power. They are also great for powering medium size AC loads,
or running multiple smaller loads at one time. These units are typically permanently
installed.
The final inverter grouping is a permanently installed units
ranging 2,000-11,000 watts. They function much like small generators, yet are
completely silent in operation. They are great for your larger loads, such as
refrigerators.
The other question that needs to be answered when selecting an
inverter is the type of wave form. If you are running sensitive electronic equipment,
like fax machines, laser printers or high tech stereo equipment you need a sine
wave inverter. A sine wave inverter has a wave form that is very similar to
the form of grid electricity. Other options may include modified sine wave,
which is fine for items that are not supersensitive to clean power. You may
experience a humming sound when powering clocks, and small radios on a modified
sine wave inverter.