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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Landis+Gyr,Watthour Meter,3Wire,1phase,240Volt,200Amp $24.99 |
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ANTIQUE WESTINGHOUSE TYPE OA WATTHOUR METER 5 AMPS $9.99 |
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WESTINGHOUSE PORTABLE WATTHOUR METER TYPE OB $130.00 |
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GENERAL ELECTRIC SINGLE-PHASE WATTHOUR METER I-30-A $55.00 |
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GENERAL ELECTRIC WATTHOUR METER $35.00 |
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ITRON – WATTHOUR METER (KWH) CENTRON – C1S – LOT OF 4 $49.99 |
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ITRON – WATTHOUR METER (KWH) C1SR – CENTRON – LOT OF 4 $74.99 |
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GE Thomson IS-2 Watthour Meter Switchboard Meter -Nice! $38.00 |
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GE Electric Watthour Meter $0.99 |
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GE WATTHOUR METER (KWH) 3 PHASE CL20 13 JAWS, LOT OF 4 $149.99 |
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Meter Programable Multifunction Commercial Watthour $120.00 |
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LANDIS & GYR WATTHOUR METER (KWH) 3PH RXS4e CL20 13 JAW $149.99 |
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VINTAGE GENERAL ELECTRIC WATTHOUR METER DS-6 POLYPHASE $125.00 |
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Schlumberger,Watthour Meter,3Wire,1phase,240Volt,200Amp $19.99 |
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Electric Utility grade Watthour Meter Glass/Globe $8.50 |
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Durham Watthour Meter 200 Amp 1PH 3 Wire 600 Volts Max $38.00 |
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ELECTRIC WATTHOUR METER $26.00 |
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2 Schlumberger Watthour Meters 240 Volt 3 W 1 phase $9.99 |
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* SENSUS ELECTRONIC WATTHOUR METERS iSO2W99000 $150.00 |
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Amprobe Watthour Meter, WH-2V1A1P3W, N/R $49.99 |
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ABB TMD-D5S Watthour ELETRIC HOUR Meter READER $149.99 |
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1925 Crosley radio set Triryn special watthour meter ad $12.99 |
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DUNCAN WATTHOUR METERS 3-RING BINDER ***NICE*** $35.00 |
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LANDIS GYR RXS4 WATTHOUR ELECTRIC METER NEW $24.95 |
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GENERAL ELECTRIC 120V WATTHOUR METER $35.00 |
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Sangamo WattHour Electric Meter 240V 4 Digits 4-Pack $69.95 |
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4 PACK Landis & Gyr WattHour Electric Meter 4-Digits $69.95 |
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Duncan WattHour Electric Meter 240V 4 Digits Four-Pack $69.95 |
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Duncan Single Station WattHour Electric Meter 4 Digits $29.95 |
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Electronic Watthour Meter–240 Volt 200 Amp Residential $25.00 |
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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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FREE SMART Software-Electric Energy kWh Watthour-METER $140.00 |
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FREE SMART Software-Electric Energy kWh Watthour-METER $140.00 |
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Schlumberger PolyphaseTwo Stator Watthour Meter 55FQ $495.00 |
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KNOPP ST-16 WATTHOUR METER WATT CALIBRATION CALIBRATE $4,995.00 |
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Phazer T-120 Watthour Meter Test & Calibration System $2,995.00 |
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ABB,AB1S,Watthour Meter,3Wire,1phase,240Volt,200Amp $12.99 |
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LANDIS & GYR WATTHOUR METER (KWH), 3PH RXS4e CL320 7JAW $99.99 |
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GE- WATTHOUR METER (KWH), NETWORK, V-62S – LOT OF 4 $149.99 |
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GE- WATTHOUR METER (KWH), 3 PHASE, KV2C, BRAND NEW $175.00 |
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SANGAMO, WATTHOUR METER (KWH), NETWORK, KYS – LOT OF 4 $120.00 |
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ABB, WATTHOUR DEMAND METER (KWH), 1CT 1VT, A1D+, NEW $75.00 |
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Sangamo J5S, Watthour meter,1Phase,200Amp,240Volt,5Dial $19.99 |
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LANDIS AND GYR TWO STATOR WATTHOUR METER NEW IN THE BOX $53.00 |
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ELECTRIC WATTHOUR METER LAMP – GE I-30 $229.95 |
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FOUR GE FITZALL DIGITAL WATTHOUR METERS 3 PHASE $110.00 |
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WATTHOUR METER $220.00 |
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Watthour Meter Solid StateSSM-2 Landis & Gyr 120V NEW $48.00 |
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ABB Tika Energy A1TL Watthour Meter w/Memory UNUSED $54.95 |
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Landis Gyr DIGITAL Electric WattHour Power Meter AXRS4e $174.99 |
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GE 3 Stator Watthour Meter 3PH 701X501G1 Wattmeter $495.00 |
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ABB,Type D5S Watthour Meter,3Wire,1phase,240Volt,200Amp $16.99 |
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The Watthour Meter NEW by William M. Shepard $40.53 |
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Duncan MT-5S two stator watthour meter 60Hz; 120V NEW $200.00 |
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P3 International P4400 Kill A Watt Electricity Usage Monitor $52.43 Large LCD counts consumption by the kilowatt hour Connect to household appliance & it will assess its efficiency Calculate electrical expenses by the day, week, month or year Check the quality of power by monitoring voltage, line frequency & power factor… |
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ORIGINAL PATENT APPLICATION NUMBER 5,582 FOR IMPROVEMENTS IN CONNECTION WITH ELECTROSTATIC WATTMETERS OR WATT-HOUR METERS (BLACKHEATH). … |
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Watts watching: Why we watch watts with watt-hour meters (ENCORE module ; 7) … |
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The NIST digitally synthesized power calibration source (SuDoc C 13.46:1281) … |
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