
Thus the right size of PV system (in kWp) should be estimated by dividing maximum daily usage units divided by 5. A 1 kWp (or peak kilo watt) system would generate 5 to 7 units in a day. Every PV panels has a peak wattage (Wp) mentioned on them. The size of PV system should not be less than the one that can generate total units consume in a day.

To size a PV panel, the most essential thing to know is the Total Units consumed in a day by the appliances in a setup (unless it is a direct connected system or a grid connected system for which details are mentioned here: link). Two things are absolutely essential are: Total wattage of appliances (which denotes the instantaneous electricity requirement of a setup) and Total Units (which denotes the total electricity used in a day). This helps in calculating the number of units of electricity used in a day using the formula below: This is required if you do not have a sample electricity bill. Daily usage of each appliance in hours.Daily units can be obtained by dividing month units by 28/29/30 or 31 (depending on the number of days in the month for which the bill is generated) Used to check the monthly electricity units used in a setup. If you do not have wattages then you can look at the current requirement (in amperes) of the appliances and calculate wattage with this simple formula:.


(Along with all the electrical values mentioned in article mentioned above) A few things that can help are: The most important thing that one needs to know before sizing a PV system is the energy requirements of a setup.
