Generator Current Ratings (Three-Phase AC)
| Power | Current at 120V | Current at 240V |
|---|
| 1 kW | 6.014 A | 3.007 A |
| 2 kW | 12.028 A | 6.014 A |
| 3 kW | 18.042 A | 9.021 A |
| 4 kW | 24.056 A | 12.028 A |
Type of Supply & Connected Load (Fixed charges of each State/DISCOM): Connected (or Sanctioned) Load is the total pool of supply that is given to a meter. This is calculated in kW (or Killo-Watts). This is the permissible total peak kW given to a meter based on the appliances connected to the meter.
Calculate power rating in KVA when you know voltage and output resistance. Use the formula: P(KVA) = (V^2/R)/1000 where R is resistance in ohms. For example, if V is 120 volts and R is 50 ohms, P(KVA) = V^2/R/1000 = (14400/50)/1000 = 288/1000 = 0.288 KVA.
The kW to kVA Formula:Apparent power (kVA) x power factor (pf) = actual power (kW) e.g. 100 kVA x 0.8 = 80 kW. The formula for converting kW into kVA is: Actual power (kW) / power factor (pf) = apparent power (kVA)
If you have a 200 Amp service panel, use a 15-20 kW GenSet (again use the larger size if you have air conditioning or large well pump). If you have a 400 amp service panel, use a 30-50 kW GenSet (if you have lots of air conditioning or other larger loads use the large size in the range).
Motor is rated in kW since it specifies the capacity of the motor to drive its load. It is the active power (kW) that is of interest when a motor drives a load. The motor converts the active power that it draws from the mains into mechanical power that the load consumes/demands.
Power is a measure of the amount of work that can be done in a given amount of time. Power equals work (J) divided by time (s). The SI unit for power is the watt (W), which equals 1 joule of work per second (J/s).
GENERATOR AMP RATINGS - THREE PHASE EXTENDED
| kVA | kW | 240 |
|---|
| 25 | 20 | 60.2 |
| 31 | 25 | 75.3 |
| 38 | 30 | 90.3 |
| 44 | 35 | 105.4 |
The primary difference between kW (kilowatt) and kVA (kilovolt-ampere) is the power factor. kW is the unit of real power and kVA is a unit of apparent power (or real power plus re-active power).
For example, a three phase circuit using 25,000 watts of power and a line voltage of 250 will have a current flow of 25,000/(250 x 1.73), which is equal to 57.80 amperes.
One kilowatt is equal to 1000 watts, so to calculate how many kWh a device uses, divide the watt-hours from the previous step by 1000.
For three phase, you connect line 1 to line 2 and get 208 volts.
p.f. = average power factor or the three separate phases. 1.732 = a constant necessary with 3 phase. In a three phase circuit, the use of the constant 1.732 results from the fact that not all three phases are producing the same amount of power at the same time.
To convert A to kVA in a three-phase circuit use the following formula. kVA is equal to the square root of 3 (1.732) times amps times volts, divided by 1,000.
In India, monthly power consumption of an average household is 250 kWh. Therefor an average Indian house needs approximately 2.3 kW of solar system which is 7 solar panels each of 330 watts.
Just like the odometer on your vehicle that shows the actual distance travelled by the vehicle, electricity meter shows the amount of electricity that is used. So a 100-Watt bulb if kept on for 10 hours will consume: 100 x 10 = 1000 Watt-Hour = 1 Kilowatt-Hour (kWH) = 1 units (on your meter).
Generac 7043 Home Standby Generator 22kW/19.5kW Air Cooled with Whole House 200 Amp Transfer Switch, Aluminum. Available from these sellers.
One kilowatt is equal to 1,000 watts, so to figure out the kWh per day that your refrigerator uses, you simply need to divide the watt-hours per day (7,200) by 1,000 for a total of 7.2 kWh per day.
