How To Choose The Right PV Power Inverter

For those new to photovoltaic systems, the various components that make up a system may be confusing. Inverters are one of those components that some may know they need, without knowing why. This guide will help to clear up some confusion about inverters.

What is an inverter?

Inverters are devices that convert direct current (DC) voltage from photovoltaic cells into alternating current (AC) voltage.

Why do you need an inverter?

Inverters are necessary components of any photovoltaic systems where the load is an alternating current (AC) instead of a direct current (DC). PV modules produce electricity in the form of DC voltage. This electricity is then stored into a battery in that form. Most household applications require AC voltage. This device will allow you to convert your electricity so it will be useful for your household appliances, or for any devices that require AC voltage as opposed to DC voltage.

Are inverters efficient?

Today, inverters have can have efficiencies greater than 90%. They are highly cost effective for those looking to use them for situations requiring AC voltage.

What to take into consideration when choosing an inverter:

Usage – what application will you be using the inverter for (off grid, or grid-tie)?

Size of your PV System – Inverter should match size of your PV power system or appliance you need it for. If you have a 2,500W PV system, and must choose between a 2,000W inverter or a 3,000W inverter, you should go the next size up and get the 3,000W inverter.

However, if you need an inverter for specific needs such as an appliance, and do not know the power rating but know the amperage, a simple formula is:

Amperes * 120 V = Watts

For example, if you have a simple 5 ampere appliance that requires AC voltage, then you would need a 600 W inverter.

Manufacturer – Some well known manufacturers are Xantrex, SMA, and OutBack.

Sine-wave – Currently, modified sine wave converters dominate the market and are useful for most purposes requiring AC voltage. However, certain equipment, such as laser printers, may require the better quality of power offered by a true sine wave converter. When choosing between the two, consider the equipment that the inverters will be supplying.

There are many factors to take into consideration when choosing the right inverter for your needs. If you are not sure about which inverter may be right for your needs, it may be a good idea to work with an inverter dealer or manufacturer to determine which inverter would work for you.