Investment cost of solar off-grid power generation solutions for rural households and small farms solar street light-

Users often ask: How much does it cost to use solar power in rural households or farms? This is a very vague concept. According to the living and economic level of ordinary rural families in my country, electrical equipment mainly includes basic household electrical appliances such as lighting, TV sets, rice cookers, refrigerators, and electric fans. In the hot summer season, the air conditioner is a large power consumer, and farmers generally save it. In winter, the heater, which is also a large power consumer, has a relatively long working time. Assuming that the full-load power of electrical appliances in a rural family is about 3000W, the average power consumption per day is about 10KWh, the electricity rate is 0.5-0.6 yuan per kilowatt-hour, and the monthly electricity expenditure is about 200 yuan. For rural areas with relatively complete power grid infrastructure, if there are not many power outages in normal times, and the power outage will not have a great impact on life, then we recommend that users do not rush to use solar power generation. Because whether it is a photovoltaic grid-connected power station or an off-grid system (with a complementary mains), the cost of solar power generation cannot be compared with the price of thermal power or hydropower. In remote mountainous areas, plateaus, pastoral areas, islands, Gobi and other places, because there is no public power grid environment, the cost of long-distance transmission of electricity is high, and the cost of diesel power generation is also unbearable for users. Solar power generation is an energy supply method worth choosing. . Case 1: Rural household solar off-grid power generation system (commercial electricity complementary type) [Table 1] Rural household solar off-grid power generation system (commercial electricity complementary type) configuration and quotation reference: project specification unit quantity solar panel 36V 280W block 10 proof Lightning combiner box 2 sets of photovoltaic input 1 set of DC output set 1 photovoltaic inverter 48V 6KVA set 1 lead-acid battery 12V 200Ah only 4 photovoltaic brackets The total price of 100 meters of core national standard 4 square copper wire is 28,000 yuan (excluding tax, excluding freight, and not including installation) Remarks: The designed installed capacity is 2800W, the maximum power generation is 8 kWh per day, the reserve power is about 6 kWh, and the inverter The actual load power of the device is 4800W. Case 2: Photovoltaic off-grid power generation system for small farms Take a small farm as an example. The electricity used for daily life includes lighting, TV sets, and rice cookers, while the electricity used for production includes inductive loads such as small pulverizers, mixers, blowers, and water pumps, with a total power of 10KW . The SAKO Sanke® series photovoltaic off-grid power generation system of Shenzhen Jinsanke Co., Ltd. is adopted, and the three-phase AC380V 50Hz output can basically meet the daily production electricity demand of the farm. In this scheme, the photovoltaic module array is used to generate electricity, and the high-power MPPT photovoltaic controller is used for charge and discharge management, which is directly inverted into AC power for the load, and the battery is charged at the same time. Equipped with three-phase high-power power frequency inverter (maximum power 100KVA), when the photovoltaic is insufficient, the battery is inverted and output to meet the electricity demand of electromechanical equipment. [Table 2] Small farm photovoltaic off-grid power generation system configuration and quotation reference: project specification unit quantity solar panel 36V 280W block 36 lightning protection combiner boxes 3 sets of photovoltaic input 1 set of DC output set 1 photovoltaic charge controller 360V 100A 1 set Three-phase inverter 380V 30KVA set 1 lead-acid battery 12V 150Ah only 30 AC power distribution cabinet 380V 100A set 1 photovoltaic bracket galvanized cold-rolled steel set 1 battery cabinet double layer with door iron 1 photovoltaic cable double core national standard 10 square meters The total price of 100 copper wire meters is 98,000 yuan (excluding tax, excluding freight, and not including installation) Remarks: The designed installed capacity is 10KW, which can generate a maximum of 25 kWh of electricity per day, and can reserve a maximum of about 40 kWh of electricity. The load power is 24KW. The cost of solar off-grid power generation systems mainly comes from the purchase and maintenance of batteries. Under normal use, the average lifespan of lead-acid batteries is about 2 years. The solar panels use high-performance polycrystalline silicon photovoltaic modules, with a photoelectric conversion efficiency of up to 19%, which is higher than the standard set by the National Energy Administration, with a low attenuation rate and a service life of more than 10 years.