Why do people use one micro-inverter per solar pan

Edit:DECEN Date:2013-10-18
Summary: The Decen Micro-Inverter system is one of the world’s most technologically advanced inverter systems for use with grid-tie, or utility-connected, solar electric systems.

The Decen Micro-Inverter system is one of the world’s most technologically advanced inverter systems for use with grid-tie, or utility-connected, solar electric systems.

Let’s see the significant differences between traditional inverter and micro-inverter new, and find the one that can make a great contribute to our solar photovoltaic (PV) power system.

In a solar photovoltaic (PV) power system, solar panels and inverters work together to collect solar energy and convert it into usable electricity. While solar panels have become commodity products, inverters remain a key energy harvest component that has attracted a lot of attention and investment.

-Central Inverter or String Inverter

In a traditional solar power system, the DC output from each solar panel is combined in a DC junction box. The final DC output from the DC junction box is connected to a large central DC-AC power inverter to generate electricity. Using a Central (or String) Inverter includes the following shortcomings:

1. If the inverter fails, the entire solar power system is down;

2. The performance of the entire solar power system is dictated by the performance of the weakest solar panel. Therefore, power production is negatively affected by non-uniformity of solar panels, sunlight variations or partial shading due to clouds, trees, dust on the panel. As shown in the following graphic, even if only one solar panel is partially shaded, the entire system performance will drop significantly.

3. The Maximum Power Point Tracking (MPPT) can only be applied to a system level, not to each solar panel;

4. A lot of design and installation effort must be made to assure the solar panels are properly oriented in respect to each other;

5. DC wiring from each solar panel to the junction box can be costly and labor intensive; and

6. High-voltage DC such as 600V is distributed in the system and has the potential to trigger a high intensity arc, which can cause fire. This is a major issue for installing a central inverter based solar power system on the roof of a commercial building. -Micro-inverter A solar power Micro-inverter typically has a compact and moisture proof design so that it can be attached directly to a solar panel. Micro-inverters overcome the shortcomings of Central Inverters in many ways.

1. Maximum Power Point Tracking (MPPT) can be performed for each panel so that solar power production is improved by 13% to 19%.

2. Micro-inverters can sharply reduce the installation cost because no more detailed solar alignment design is required, and DC wiring to DC junction box is no longer needed.

3. There is no high-voltage or high-current DC in a solar power system using Micro-inverters. So, it is much safer for the installer, user, and the property.

4. No more partial shading problems. As shown in the following graphic, if a solar panel is partially shaded, it will not affect the performance of other panels. Micro-inverters,

however, have their own set of challenges including the following:

1. While a Central Inverter is typically installed on a wall or on the ground out of direct sunlight, a Micro-inverter is typically attached to the solar panel on the roof top, which can be a very harsh environment.

2. Since the enclosure of a Micro-inverter must be sealed to be water proof, cooling fans cannot be used. Therefore, a Micro-inverter has to be designed and manufactured to generate minimal heat. -Decen micro-inverter The patent pending Decen micro-inverter is one of the world’s new Micro-inverters that possesses the key merits of both Central Inverters and Micro-inverters. What is more, a Decen micro-inverter overcomes the main shortcomings of traditional Inverters with the following key features and benefits: 1. The idea about duo micro inverter for every 2 panels would be a great improvement comparing with a micro inverter for a single panel: simplify system installations: same quantity of panels with half the number of inverters; no more extra power line or connectors. Of course, save much cost at the same time for a complete system building, and the efficiency would be comparable with micro inverter for single panel, that’s able to harvest the Max solar electricity.

2. A Decen micro-inverter can connect to multiple solar panels that may be different in types, sizes, and sunlight orientations.

3. A Decen micro-inverter can perform Maximum Power Point Tracking (MPPT) on each connected solar panel to optimize power production.

4. No more partial shading problems. As shown in the following graphic, when a solar panel is partially shaded, it will not affect the performance of other panels.

5. A number of Decen micro-inverters that connect to a mixed number and variety of solar panels can easily daisy chain with standard AC power cables and connectors. The total generated power equals to the summation of the AC power supplied by each Decen micro-inverter.

6. Decen micro-inverters can cut down the installation cost tremendously because no more detailed solar alignment design is required, and DC wiring to DC junction box is no longer needed.

7. The inputs to a Decen micro-inverter are low-voltage DC and the output from the Decen micro-inverter is the standard 110V AC/240V AC, so there is no high-voltage or high-current DC in the system. It is much safer for the installer, user, and the property.