A field tester for testing metering accuracy of an electrical panel meter system according to any of claims 6-7, the field tester comprising: a reference power meter; a current source having an output coupled to an input of the reference power meter; a computer coupled to the reference power meter and to the current source, the computer comprising a processor and a memory; a plurality of power conductors coupled to the reference power meter and to the current source and configured to be coupled to a respective plurality of terminals of a main line connector of the electrical panel meter system; a first conductor coupled to an output of the reference power meter and configured to be coupled to a first terminal of a test conductor of the electrical panel meter system, the test conductor coupled sequentially to each meter module of the electrical panel system, the test conductor having no electrical connection to a plurality of branch circuit connectors of the electrical panel meter system; a second conductor coupled to a return of the current source and configured to be coupled to a second terminal of the test conductor; and a third conductor coupled to the computer and configured to be coupled to a controller of the electrical panel meter system; and wherein the computer is configured to: issue a test mode command to the controller; command the current source to output an electrical signal via the first conductor; and command the reference power meter to measure a parameter related to the electrical signal, in particular an energy value; issue a send command to the controller to have at least some of the plurality of meter modules sample electrical readings of an electrical signal passing through the test conductor and send the sampled electrical readings back to the computer; receive the sampled electrical readings; compare the received electrical readings to a parameter of the electrical signal measured by the reference power meter; and indicate a pass/fail result for each of the at least some of the plurality of meter modules on the basis of the comparison. a reference power meter; a current source having an output coupled to an input of the reference power meter; a computer coupled to the reference power meter and to the current source, the computer comprising a processor and a memory; a plurality of power conductors coupled to the reference power meter and to the current source and configured to be coupled to a respective plurality of terminals of a main line connector of the electrical panel meter system; a first conductor coupled to an output of the reference power meter and configured to be coupled to a first terminal of a test conductor of the electrical panel meter system, the test conductor coupled sequentially to each meter module of the electrical panel system, the test conductor having no electrical connection to a plurality of branch circuit connectors of the electrical panel meter system; a second conductor coupled to a return of the current source and configured to be coupled to a second terminal of the test conductor; and a third conductor coupled to the computer and configured to be coupled to a controller of the electrical panel meter system; and wherein the computer is configured to: issue a test mode command to the controller; command the current source to output an electrical signal via the first conductor; and command the reference power meter to measure a parameter related to the electrical signal, in particular an energy value; issue a test mode command to the controller; command the current source to output an electrical signal via the first conductor; and command the reference power meter to measure a parameter related to the electrical signal, in particular an energy value; issue a send command to the controller to have at least some of the plurality of meter modules sample electrical readings of an electrical signal passing through the test conductor and send the sampled electrical readings back to the computer; receive the sampled electrical readings; compare the received electrical readings to a parameter of the electrical signal measured by the reference power meter; and indicate a pass/fail result for each of the at least some of the plurality of meter modules on the basis of the comparison.