fangpusun company sets up the whole process of 3.5kw off-grid pv system
off-grid pv system is mainly used in off-grid access or energy storage system, such as isolated mountainous areas and isolated islands. off-grid pv system is mainly composed of pv modules, solar charge controller, solar off-grid inverter, battery pack, some solar inverter can also be connected to a generator.
in a off grid hybrid solar system like the one shown above, the pv module converts solar energy into electricity, which is then stored in a battery via a solar charge controller. the solar inverter powers the load. some solar inverters can also connect a generator and set the parameters to automatically start the generator when needed.
first, the load situation
considering the usage scenarios of main household electricity, the general household appliances are as follows:
refrigerator：50w*24 inductive load starting power:250w
air conditioning：750w inductive load starting power:2400w
electric fan：50w inductive load starting power:150w
third, solar pv system components
1. the inverter
the main function of the inverter is to convert direct current into alternating current and supply energy for the alternating current load.
in terms of demand, the power of the load is about 3000w, plus some inductive loads, which have large starting power, you can choose xtender series xtm/psh4000-48. the inverter of this model can continuously output 3500w, and can withstand a load of 4000w within half an hour, or up to 10500w within 5s. it's a good choice.
2. the battery
according to the data, it consumes about 7-10 kwh of electricity every day, so we need to choose 4 12v and 200ah batteries in series, which can theoretically store 9.6 kwh of electricity.
considering the load conditions, use environment, service life and cost factors, there are cost constraints where the general choice of colloidal lead-acid maintenance-free battery or lithium battery. users should not choose inferior batteries for the sake of cheap, because this will affect the reliability of the entire system and may cause greater losses.
3. pv modules
pv modules convert solar energy into direct current electricity
if the normal light is 4.5 hours and the off-grid pv system has a power loss rate of 0.2, it needs an average of 10 kwh of electricity per day and at least 27,777w of solar panels.
4. solar charge controller
the role of the solar controller is to generate electricity from the photovoltaic module, store it in the battery and protect the battery.
maximum pv open
up to 150v
5. the generator
fangpusun xtender series inverters can be connected in parallel with generators in the off-grid solar systems and off grid hybrid solar system, and the start-up time of generators can be programmed to create a flexible and stable off-grid photovoltaic system