Sol-Ark SA-CT-LG 200A Current Transformer Pair, Larger Aperture for 4/0 AWG Service Conductors, Replaces Stock 100A CTs on Sol-Ark Hybrid Inverters

Overview

The standard 100A CTs that come with a single Sol-Ark inverter close around 2/0 conductor, but not the 4/0 aluminum used in many 200A services. The SA-CT-LG pair has a larger aperture for 4/0 service conductors and replaces the standard CTs.

Key benefits

• Lets CT-dependent modes work on 200A services with 4/0 conductors.
• Needed for Limited Power to Home, grid peak shaving, and parallel Sol-Ark installs.
• Leads can be extended with twisted-pair shielded CAT6 if needed.

Key features

• 200A rating with a larger aperture for 4/0 AWG conductors
• One CT for L1 and one for L2 on split-phase services
• Connects to the dedicated CT input pins (3 and 4 for L1, 5 and 6 for L2)
• Polarity auto-detect available on 240V split-phase installs with batteries

Ideal use

For Sol-Ark hybrid inverter installs on 200A services where the standard CTs will not close around the service conductors. On 208V three-phase, orientation must be checked manually.

What is included

• Two current transformers (one for L1, one for L2)

Key specifications

Model / SKU

SA-CT-LG

Brand

Sol-Ark

Category

Home integration

Voltage

240V

From the manufacturer

About the Sol-Ark 200A CT Pair Sol-Ark ships single inverters with 100A CTs sized for 2/0 conductor, which covers 100A and most 125A residential services. The SA-CT-LG pair handles the larger 4/0 conductor used in 200A service entrances and any service where the existing CTs simply will not close around the wire. When You Need the Larger CTs Most 200A residential services use 4/0 aluminum or 2/0 copper for the service entrance conductors. The stock 100A CTs that come with a single Sol-Ark will close around 2/0 copper, but not 4/0 aluminum. If your service conductors are 4/0, you need this pair. CTs are required, not optional, for several Sol-Ark operating modes. Limited Power to Home mode uses the CTs to measure power flow at the service entrance and adjust inverter output to match house consumption. Grid peak shaving relies on CT data to know when to discharge the battery. Parallel Sol-Ark installations require CTs on the master inverter to coordinate output between units. If your installation needs any of these features and your service conductors don’t fit the stock CTs, the SA-CT-LG is the upgrade. Installation Notes Each CT installs around one leg of the split-phase service: one CT on L1, one on L2. White lead is positive, black is negative. The CTs connect to the dedicated CT input pins on the Sol-Ark (pins 3 and 4 for L1, pins 5 and 6 for L2). Polarity and orientation matter. For 240V split-phase installs with batteries, run Auto Detect Home Limit Sensors from the inverter menu after installation. The Sol-Ark will alternate L1 current and detect the correct polarity automatically. For 208V three-phase, auto-detect is not available and orientation must be verified manually. If the standard CT leads aren’t long enough to reach from the service panel to the inverter, Sol-Ark allows extension using twisted-pair shielded CAT6.

Warranty terms mentioned in this description are the manufacturer’s. Our own coverage is the 30-day limited warranty.

Before you order

We confirm compatibility, installation requirements, and delivery details with you during order review, before any payment. Home electrical work may require a qualified installer.

Ask our team to confirm whether your service conductors need the SA-CT-LG pair for your Sol-Ark inverter. Message our team on WhatsApp.