Inverters are used in any electric system where AC power output is needed. You are already familiar with AC power: it is the power in your area when you plug something into the wall. The inverters job in a solar energy system is to convert the DC electricity, such as from a battery bank, to AC electricity that can be used with typical appliances. Solar panels also produce DC electricity. Inverters are used in homes, business, RVs and boats. Off Grid Inverters are common in solar electric. Solar electric (or PV) systems can operate with or without batteries. Since each inverter needs proper disconnects on the AC and DC side. Sizing an off grid inverter (that needs batteries) is relatively straight forward. It must be large enough to handle the total amount of watts you will be using at one time.
Start by listing all of the appliances, etc. That you use and their wattages in our load calculator. This form will display the number of watt hours you use in a day. In order to properly size an inverter, consider which of those loads you will be using simultaneously and add up their wattages only. For example, if you will be using the 1500 watt microwave at the same time you will be running 100 watts of lighting and also running a refrigerator that will draw 500 watts of instantaneous power, you will need an inverter that can handle at least 2100 watts (1500 + 100 + 500). Once you have identified a minimum wattage, you will select an inverter that has the same nominal voltage as your battery bank (12, 24, or 48 VDC).
Two type for off-grid inverters:
Off-Grid Inverter Modified Sine Wave
Theta inverters are principally meant to be used with solar, wind or hydro power systems for a home or business totally disconnected from the electric utility company. They can also be used for providing emergency backup power to homes that currently use the power from an electric company. Inverters with the built-in AC charger option are particularly well suited to providing seamless backup power.
Theta Inverters are designed in compact, lightweight and portable! Inverters plug into a vehicles lighter socket, and are an easy solution for your small power needs. These unique and convenient inverters can be used for small recharging power needs such as video cameras, laptop computers, and cellular phones. AC outlet is built into the face of the Inverter, and this inverter can be used to run your TV, VCR, lights, computer and satellite receiver.
Connect directly to 12V battery and turn to mini power station for powering small appliances (220-240V).
Off- Grid Inverter Pure Sine Wave
Pure Sine Wave Inverter converts DC power stored in 12V batteries into clean AC. There Pure Sine Wave inverters provide power with very low harmonic distortion, no static or humming noise Perfect for HDTVs, computers and other sensitive electronics High and low voltage protection Overload protection Over-temperature protection
The Pure Sine Wave, heavy duty inverter ensures all electrical products run at their very best. It removes all problems linked with modified sine inverters such as small black lines on some TV screens. It works perfectly with satellite controllers, runs microwaves at 100% power. They also eliminate problems caused by low cost, non-isolated sine wave inverters, such as interference on TV screens, radio and hi-fi noise and works all CD and DVD players. This unit runs all equipment as per the mains – guaranteed.