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Measuring Power Consumption


Before deciding to invest in a renewable energy system it is vital to first of all find out how much and where energy is being used and then conserve any energy that might be being wasted. For appliances that switch on & off automatically (eg. fridges & freezers) measurement over time is necessary.

Many appliances use energy when you think they are switched off eg. televisions on Standby or washing machines, computers & chargers left switched on at the wall. It is not uncommon to find that some appliances (eg. TV’s) use more energy over a 24hr period when switched off (but left plugged in) than when being used. To check for these ‘Phantom’ loads consumption meters can be used to detect where electricity is being wasted and offending items switched off at the wall when not in use.

The efficiency of different appliances can be compared to ensure power is used sensibly and inefficient ones replaced where necessary. This investigation is invaluable to either reduce electricity bills or to make off-grid electricity systems more successful. A watt saved is a watt that doesn’t need to be generated! After a renewable energy system is installed it is just as important to monitor consumption. Consumption can then be compared with production to ensure self-sufficiency.

Energy Monitors


Powermeter


This is a plug-in meter that measures the energy consumption of an individual appliance. Simply plugs in between the appliance and a socket to give power & cumulative energy consumed. Especially useful to measure energy consumption of items such as fridges.







The Owl


Monitors the total energy consumption of a household or building allowing wastage to be eliminated. Displays electricity consumption, cost & associated CO2 emissions, together with temperature & humidity. Audible alarm can be set for excess consumption. Uses a clip on wireless transmitter sensor and portable LCD display with a range of 30m. Extra sensors needed for 2 or 3 phase supplies



See Also: Grid Connect Accessories for other electricity consumption (kWh) meters.

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