Page 6 - PS Battery Guide May 18

P. 6

Battery guide For PowerSpout

Glossary of terms

Amp - A unit of current (A).
Amphour - A measure of battery size (Ah) that indicates roughly how many
amps of current can be delivered for how many hours.
Energy - the accumulated effect of power measured in kWh units, this is what
you would pay for in an electricity bill.
Current - a flow of charge around a circuit measured in amps (A). This is already
a rate of flow so there is no such thing as "amps per hour".
kilowatt - a unit of power (kW) that is the rate of energy transfer in thousands of
watts. Note there is no such thing as "kW per hour" as the kW is already a rate.
kWh or kilowatt hour - a unit of electrical energy accumulated by generating
1000W for a period of 1hour.
Power - measured in watts (W) or kW this is the rate of supply of energy.
Voltage - Electrical "pressure" in a circuit. The actual measured voltage may
vary from the nominal voltage but it is usually fairly stable. Measured in volts (V)
Watt - a unit of electrical power (W) that is the rate of energy transfer.
Watt hour - A unit of energy (Wh), one thousandth of a kWh unit of electricity,
produced by just one watt of power over a period of one hour.

Simple equations:
Power in Watts (W) = Battery voltage (V) x current (A)
Example: 48V battery working at 50V giving 20A current
= 50 x 20 = 1,000W = 1kW

Energy in kWh
Energy = power x time elapsed = voltage (V) x current (A) x time (hours)
Example: 24V battery charging at 28V and 50A for 2h (100Ah)
= 28 x 50 x 2= 2,800Wh = 2.8kWh

Lithium battery guides
For other battery types mounted in or on the outside of your home refer to these
Australian guides.

 Installer guide
 Consumer guide

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