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Accuracy Requirements for Massachusetts SREC Program

As of January 1, 2013, new solar projects installed in Massachusetts must meet the follwoing accuracy requirements:

 

 Nameplate
Capacity
(DC)

Minimum Meter Accuracy

(all values are +/-)

Other Requirements

Up to 10 kW

2%

(ANSI C-12.1-2008 )

Electromechanical meters may be used. Refurbished meters, if retested and certified, may be used. Allowable configurations for meters are :

  • Single-phase 120 volt - Form 1S, Class 100
  • Single-phase 240 volt - Form 2S, Class 200
  • Three-phase 120 - 480 volt - Form 14- 16S, Class 200

Meters used as part of a Data Acquisition System (“DAS”) must meet the "Greater than 10 kW and up to 1 MW" nameplate capacity requirements below.

 

Greater than 10 kW and up to 1 MW

1%

(ANSI C12.16 or better) 

Only new solid state meters are allowed. Current transformers (“CTs”) must conform to the 0.6% (ANSI/IEEE C57.13-2008) accuracy class, or the meter must be tested using the CT and certified to meet the minimum accuracy requirement.

 

Greater than 1 MW

0.5%

(ANSI C12.20-2010)

Only new solid state meters are allowed. CTs must conform to the 0.3% (ANSI/IEEE C57.13-2008) accuracy class, or the meter must be tested using the CT and certified to meet the minimum accuracy requirement.

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