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Stand-alone systems are independent from the utility grid, avoiding the possibility of losing power when the grid goes down. Electricity from stand-alone systems are used on site, such as an RV or cabin. Power that is generated can be stored in batteries and used at night or on sunless days. A generator may also be used for back-up. For PV applications, the size of a stand-alone system is usually up to 50KW.
The system diagram as follow
System includes:
1. PV Array: A number of PV panels connected in series and/or in parallel giving a DC output out of the incident irradiance. Orientation and tilt of these panels are important design parameters, as well as shading from surrounding obstructions.
2. PV controller: control battery bank charge and discharge reasonable and safety.
3. Inverter: A power converter that "inverts" the DC power from the panels or batteries into AC power. The characteristics of the output signal should match the voltage, frequency and power quality limits in the supply network.
4. Battery bank: can be a single battery or multiple batteries connected together to create essentially one large battery system of the required voltage and amp-hour capacity. In some ways the battery configuration and capacity are the most important electrical power decision to make, and a wise choice can help guarantee a steady supply of electrical power as well as a system that is simple to operate and maintain.
5. Loads: Stands for the network connected appliances in the building that are fed from the inverter, or, alternatively, from the grid.
We have some typical solar pv system packages as follows, these are for Mid-east area, the output power will be more or less in other regions depends on the sun irradiation.
100Watt small system for lighting(15Kwh per Month)
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2 |
54Wp Amorphous solar panel or Mono crystalline. |
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1 |
12V10A solar controller |
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1 |
175W modified sine wave inverter |
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1 |
12V100AH Free maintenance VRLA battery |
This small system can runing for a small country house for 3 pcs energy-saving lamp, and a small TV set.
1000Watt Medium system for a house. (150Kwh per month)
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20 |
54Wp Amorphous solar panel or Mono crystalline. |
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1 |
24V 40A solar controller |
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1 |
1500W modified sine waver inverter |
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4 |
12V 200AH Free maintenance VRLA battery. |
2000Watt Large system for a house. (300Kwh per month)
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40 |
54Wp Amorphous solar panel or Mono crystalline. |
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1 |
48V 40A solar controller |
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1 |
3000W modified sine waver inverter |
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8 |
12V 200AH Free maintenance VRLA battery. |
Live in style beyond the power company. By providing up to 300 kWH/Month, this system may cover all of your off-grid energy needs. AC power supplied by the 3000W inverter, can run almost every appliance for the household.
Below are some projects pictures:
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