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As a start, it is important to consider the system power requirements, which usually involve the following parameters.
System load capacity calculation
If a set of system load types is as follows: lighting power 200W, power consumption 6h, washing machine power 400W, power consumption 3h, refrigerator power 135W, power consumption 24h, rice cooker power 400W, power consumption 3h, water heater 3200W.
 

Calculation of power consumption of conventional loads
Lighting: 200W*6=1.2kW-h
Electric rice cooker: 400W*3=1.2kW-h
We reserve daily electricity consumption of the washing machine and other kitchen loads for 3kW-h
→ Calculated 5.4kW-h
 

Calculation of power consumption for non-conventional loads
Refrigerators and electric water heaters are intermittent loads, and there are many factors affecting their daily power consumption, such as storage of food, start/stop times, and insulation performance of machine materials.
The power consumption of such loads should refer to their energy efficiency labels. For example, the nameplate of the energy efficiency label of the 135W refrigerator shows 0.69kW-h/24hm.
[Note] The rated power consumption refers to the power consumption in the environment of 25 degrees, refrigerator/freezer in a stable operating condition, not open the door empty box plugged into the power to run 24h, so the actual power consumption must be higher than this value.
According to the use- experience, the actual electricity consumption is about 1 time the label, which is 2kW-h a day, taking into account the loss of 3kW-h a day.
Electricity analysis of power 3200W electric water heater, according to the manufacturer's information about 1000W / 1h power consumption 1kW-h, 3200w * 1 = 3.2kW.h. According to the energy-saving signs, the standby insulation state is 0.6kW-h / 24h, and the total power consumption is 3.8kW-h, taking 4kW-h.
 

Total daily load power consumption
5.4kW-h+7kW-h=12.4kW-h. The above is the calculation of load power consumption, and it should be noted that the calculation idea is slightly different for conventional load and non-conventional load.

The common types of loads in life are mainly resistive and inductive.
Resistive load
In the circuit, if there is a resistive inductor and capacitor, but the inductor and capacitor ratio is appropriate, the voltage and current can be the same phase, that is, "can be equivalent to pure resistance", such as the load for incandescent lamps, electric stoves, heaters, water heaters, electric ovens. In general, the purely resistive load that works only through resistive components is called resistive load.

Inductive load
Generally, the load with inductive parameters is called inductive load. To be exact, the load current should lag behind the load voltage a phase difference characteristic for inductive loads, such as transformers, motors, fans, washing machines, air conditioners, and other loads, called inductive loads. It refers to some equipment in the consumption of active power that also needs reactive power to establish the magnetic field. Circuits with coil loads are called inductive loads.

Capacitive load
Generally refers to loads with capacitive parameters, such as capacitors, and power compensation cabinets, i.e., loads that meet the voltage lag current characteristics. When the capacitive load is charged and discharged, the voltage cannot change abruptly and its corresponding power factor is negative, and the corresponding inductive load has a positive power factor.