Will an exteral power source cause a watthour meter to run backwards?
Yes, the meter will run backwards if it is the typical induction-disk meter. The power meter is a motor that will run forward s or backwards in response to the direction of power flow.
However, it probably is universally true that regulations prohibit connection of a power source without permission from the utility and without meeting the utility’s requirements for interconnection. There are good reasons for this, among them:
1. Safety: The utility has to be able to disconnect and lock out all power sources from the grid before utility workers can repair lines. Even a small generator (e.g. 500W) that remains connected can backfeed through the service transformer and enegize the high-voltage lines at their rated voltage (e.g. 12kV). So usually there is a requirement that you provide an approved lockable disconnect switch that the utility can access for the purpose of disconnecting your power-producing system.
2. Equipment damage: If a generator is connected out-of-phase, the tremendous torque that is developed can literally bend the generator shaft, destroying the generator. So synchronizaton gear (paralleling equipment) of some sort is necessary. In the case of solar arrays, the inverter can have this as an automatic capability. Inverters generally need approval.
3. Utility system protection: Adding generators to the grid can necessitate changes in the electrical protection settings (and equipment) that the utility uses to protect the electrical grid. The utility needs to know about all generation that is added.
4. Rate structures: The utility usually is a public utility that charges in accordance with state-mandated tarriffs. By running your meter backwards, you effectively would be selling energy to the utility in a manner that isn’t approve by the authorities. There are legal issues here.
In some utility-approved cogeneration applications where the customer agrees to use all energy on site, the utility might swap out the electric meter for a similar-looking one that has a ratchet that keeps the meter from spinning backwards when power flows in the reverse direction. Normally the utility does not install a ratcheted meter in residential situations where there are expected to be no power generation sources on the premises.
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ABB TMD-D5S Single Stator Watthour Meter New No Reserve
$9.02 |
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Schlumberger CENTRON Electric WATTHOUR METER 240volt
$20.99 |
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Sangamo HC Watthour Meter reads hundredths of kwh 2wire
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General Electric Watthour Kilowatt Hour Meter kWh AR2
$20.50 |
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Centron 240v WATTHOUR METER & NEW 100amp SOCKET KIT
$40.98 |
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ABB TMD-D5S Single Stator Watthour Meter New No Reserve
$10.05 |
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ABB Electric 120v or 240v WATTHOUR METER & 100a SOCKET
$39.98 |
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ABB Electric WATTHOUR METER 120v or 240v
$19.99 |
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Centron Electric 240v WATTHOUR METER & 200amp CAN BOX
$60.94 |
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200amp WATTHOUR METER SOCKET CAN BOX Landis & Gyr
$39.95 |
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2 Cannon Tech. 7309C21G37 Single Stator Watthour Meters
$1.97 |
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Sangamo Electric Watthour Meter UNUSED 0-0-0-0-0
$9.99 |
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AVO ATB-3P SIGMA METER WATTHOUR METER TESTER L@@K!~
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4 Centron meter watthour watt electric Itron power ge
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200 AMP DUNCAN WATTHOUR METER
$12.00 |
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LANDIS GYR RXS4 WATTHOUR ELECTRIC METER NEW
$24.95 |
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ABB WATTHOUR METER (KWH), TYPE AB1, BRAND NEW, LOT OF 4
$199.99 |
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Ener-Comm Diagnostic Watthour Meter ECE-3100
$9.99 |
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Landis+Gyr,Watthour Meter,3Wire,1phase,240Volt,200Amp
$24.99 |
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Schlumberger,Watthour Meter,3Wire,1phase,240Volt,200Amp
$19.99 |
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LANDIS & GYR WATTHOUR METER (KWH), 3PH, TYPE RXS4e, NEW
$149.99 |
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GE- WATTHOUR METER (KWH), 3 PHASE, Y, EV-4 - LOT OF 4
$149.99 |
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GE- WATTHOUR METER (KWH), NETWORK, V-62S - LOT OF 4
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GE- WATTHOUR METER (KWH), 3 PHASE, I-210, BRAND NEW
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GE 3 WATTHOUR METER VW-64S 10S CL10 3-STATOR 120V
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Sangamo J5S, Watthour meter,1Phase,200Amp,240Volt,5Dial
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Electric Watthour Meter Socket Kit! Brand NEW!
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Landis Gyr DIGITAL Electric WattHour Power Meter AXRS4e
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ABB,Type D5S Watthour Meter,3Wire,1phase,240Volt,200Amp
$9.99 |
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RFL 5800 Three Phase Watthour Meter Calibration System
$9,000.00 |
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FARM FARMING, building,WIRING MOTOR WATTHOUR METER BARN
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Elster,Watthour Meter,3Wire,1phase,240Volt,200Amp, 60HZ
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ELECTRIC WATTHOUR METER 240 VOLT 200 AMP ABB TYPE AB1
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GE CL 320 AMP kVs Digital Watthour Electric METER Head
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*3 PHASE ELECTRIC WATTHOUR METER DEMAND GE KV 200 AMP*
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WESTINGHOUSE,Watthour Meter,3Wire,D5S,1phase,240V,200A
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lot of 4 GE I 70 meter watthour watt electric utility
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ABB Electric 240v WATTHOUR METER & 200amp SOCKET CAN
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single GE I70 meter watthour watt electric utility
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Kilowatt Hour Watthour Meter (KWH) Free Ship-Warrantee
$69.95 |
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ITRON - WATTHOUR METER (KWH) CENTRON - C1S - LOT OF 4
$44.99 |
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GE- ELECTRIC WATTHOUR METER (KWH) - I70S - LOT OF 4
$39.99 |
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ITRON - WATTHOUR METER (KWH) C1SR - CENTRON - LOT OF 4
$74.99 |
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Watthour meter accuracy on light, low power factor loads, (Engineering Extension Service Circular)
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Seattle City Light's advanced remote metering service: Customer and staff feedback survey
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Watthour Meters Parts 1-3 (International Library 577B)
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Electrical Engineering: Alternating-Current Measuring Instruments, Watt-Hour Meters, Voltage Regulation of Alternating-Current Circuits, Electric Lamps, Electric Heating et al
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Watthour meters: Prepared especially for home study
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