“What is a KW?”
A KW is a unit of electrical power, and it means 1000 Watts.
‘K’ or Kilo is 1000, and ‘W’ or Watt is a unit of electrical work, or Power. For example, a 50 Watt or 50W lightbulb consumes 50 watts of power.
To convert Watts (W) into KiloWatts (KW), divide by 1000. So 50W = 0.05KW.
To convert KiloWatts (KW) into Watts (W) , multiply by 1000. So 1KW = 1000 Watts.
“What is a KWh?”
A KWh is a unit of stored electrical power, or power discharged over time, and it means 1000 Watts x 1 hour.
‘K’ or Kilo is 1000, and ‘W’ or Watt is a unit of electrical work, or Power. For example, a battery with a capacity of 5000 Wh, or 5KWh can discharge 5000 watts of power for 1 hour, or the equivalent, over a different time (2.5KW over 2 hours, etc).
“What is KVA?”
KVA stands for Kilo-Volt-Amps, and it means 1000 VA. (Volt-Amps)
KVA is a unit of apparent electrical power. The Active power in KW can be calculated by multiplying the power factor (usually between 0.7 and 1) by the Apparrent Power in KVA.
2.4KW = 0.8 x 3.0KVA
For an Inverter with a rating of 3.0KVA, with a power factor of 0.8, the actual output power will be 2.4KW. Power factor is a measure of reactance of a circuit, causing reduction in active power output from 1 (zero reactance) to a fraction of 1, like 0.8.
“What is a circuit?”
Usually, a household in Australia contains 5-12 electrical circuits, each feeding one type of electrical load, usually all of the same type.
For example, most houses have the following circuits, visible by their fuses in a switchboard:
- Main Line (often 63A fuse)
- Hot water (often 10A or 16A)
- Power 1 (10A – 20A)
- Power 2 (10A – 20A)
- Lights (6A – 10A)
- Air Conditioning (6A – 10A)
- Various others: Pool Pumps, Car Chargers, Solar Inverters, Batteries,
“What is an MCB?”