This Guide will help you with installing multiple CTs for situations (Shown below) when you can't capture all the loads with just regular CT installation practices. 

Configuration of Consumption Meter with Parallel Current Transformers (CTs)

This guide expands on the standard SolarEdge instructions for configuring a consumption meter using parallel CTs, most commonly required when a home has dual main service conductors or multiple parallel feeders that must be measured as a single load.

1. Purpose and Use Case

Parallel CT configuration is used when:

• The home has two or more main service conductors supplying the same load (dual mains, split services, parallel feeders).

• Total site consumption must be measured accurately as a single value.

• A single set of CTs cannot physically or electrically capture all conductors.

By installing matching CTs in parallel, the SolarEdge consumption meter can sum the current from multiple conductors per phase.

2. Equipment Requirements

Required Components

• SolarEdge Consumption Meter (Revenue Grade or Inline, as specified by the project)

• One additional identical set of CTs (for a total of two CTs per phase)

• CTs must be the same part number

⚠️ Important: Mixing CT models or ratings will cause inaccurate readings and is not supported.

Unsupported Configurations

• ❌ PCS / BCM (Power Control Systems / Busbar Current Management)

  • Parallel CTs cannot be installed on SolarEdge meters used for PCS/BCM functionality.

3. Safety and Pre-Installation Checks

Before installation:

• De-energize equipment when possible and follow all local lockout/tagout procedures

• Verify conductor identification (L1, L2, Neutral)

• Inspect CT wiring insulation and connectors

Always follow NEC, AHJ, and utility safety requirements.

4. System Overview

Each phase (L1 and L2 in split-phase systems) will use:

• Two CTs installed on two separate main conductors

• For Lug fed panels that only place to install the CT is on the sub panel feeder wires, the L1 and L2 on the main part of the bus should go through the respected L1 and L2 CTs

• The secondary CT are wired in parallel back to the SolarEdge inverter

This allows the meter to read the combined current as if it were a single conductor.

5. Step-by-Step Installation

Step 1: Install and Commission the SolarEdge System

• Install inverter(s), production meter, and communication components per standard SolarEdge procedures

• Verify system powers up correctly before installing consumption CTs

Step 2: Install the CTs on each phase

For each phase (L1 and L2):

1. Install one CT on each conductor of the same phase

2. Ensure:

   • CT arrow or label points toward the meter

   • Both CTs for that phase are oriented the same direction

⚠️ Incorrect orientation will cause negative or reduced readings.

• Maintain strict phasing discipline:

  • L1 CTs → L1 meter terminals

  • L2 CTs → L2 meter terminals

• Do not mix L1 and L2 CT wiring

⚠️Mismatched phasing is the most common cause of inaccurate consumption data.

Step 3: Parallel Wiring of CTs

For each phase:

• Connect the same-polarity CT leads together:

  • S1 → S1

  • S2 → S2

• Land the combined conductors into the appropriate meter terminals in the SolarEdge inverter 

Guidelines:

• Use proper wire nuts, ferrules, or terminal blocks

• Keep CT wiring twisted and neatly routed

• Avoid sharp bends or pinched insulation