Wiring the EG4 Flexboss21 to the Gridboss

Wire and Conduit Analysis for between the EG4 Flexboss21 and the Gridboss

Option 5: Up to 180ft distance, $2.62/ft

Rumors say you can use Aluminum Wires with V3 of the Flexboss and when using Eaton Breakers in the Gridboss. However as of 2025 the manual still says to only use copper wire with the Gridboss. In any case you can use a junction to a short piece of copper wire before it connects to device terminals. This will protect the terminals from the expansion problems of the aluminum wire.

Aluminum to Copper Adapter: https://amzn.to/4oW5BX2

Circuit Breaker Eaton: https://amzn.to/4oOUizG
AL 2-2-2-4:
- Amazon: https://amzn.to/47UA81H ,
- Home Depot: https://www.homedepot.com/p/Southwire-By-the-Foot-2-2-2-4-Gray-Stranded-AL-SER-Cable-13102999/336468963
Conduit
- Schedule 80 PVC: 1.25” https://www.homedepot.com/p/1-1-4-in-x-10-ft-PVC-Schedule-80-Conduit-67587/100182626
- Schedule 40 PVC: 1.25” https://www.homedepot.com/p/Cantex-1-1-4-in-x-10-ft-Gray-Non-Metallic-PVC-Schedule-40-Conduit-A52BC12H/202352527

Option 4: Individual 2AWG Aluminum Wires, Up to 180ft distance, $4.66/ft

Rumors say you can use Aluminum Wires with V3 of the Flexboss and when using Eaton Breakers in the Gridboss. However as of 2025 the manual still says to only use copper wire with the Gridboss. In any case you can use a junction to a short piece of copper wire before it connects to device terminals. This will protect the terminals from the expansion problems of the aluminum wire.

Aluminum to Copper Adapter: https://amzn.to/4oW5BX2

Circuit Breaker Eaton: https://amzn.to/4oOUizG

AL 2AWG, 2 Black-Hot 1 White-Neutral:
- Amazon: https://amzn.to/43bTxIP,
- Home Depot: https://www.homedepot.com/p/Southwire-By-the-Foot-2-Black-Stranded-AL-USE-2-Cable-27282399/205001798
AL 4AWG, Ground Wire: https://amzn.to/3JGLJbh,
Conduit
- Schedule 80 PVC: 1.25” https://www.homedepot.com/p/1-1-4-in-x-10-ft-PVC-Schedule-80-Conduit-67587/100182626
- Schedule 40 PVC: 1.25” https://www.homedepot.com/p/Cantex-1-1-4-in-x-10-ft-Gray-Non-Metallic-PVC-Schedule-40-Conduit-A52BC12H/202352527

Option 3: 4AWG Copper Wire, Up to 185ft distance, $7.69/ft

Copper 4AWG, 2 Black-Hot 1 White-Neutral:

Amazon: https://amzn.to/4hMaEXB,
Home Depot: https://www.homedepot.com/p/Southwire-By-the-Foot-4-Black-Stranded-CU-SIMpull-THHN-Wire-20499099/204632882

Copper 6AWG, Ground Wire: https://www.homedepot.com/p/Cerrowire-100-ft-6-Gauge-Green-Stranded-Copper-THHN-Wire-112-4205CR/202564746
Conduit
- Schedule 80 PVC: 1.25” https://www.homedepot.com/p/1-1-4-in-x-10-ft-PVC-Schedule-80-Conduit-67587/100182626
- Schedule 40 PVC: 1.25” https://www.homedepot.com/p/Cantex-1-1-4-in-x-10-ft-Gray-Non-Metallic-PVC-Schedule-40-Conduit-A52BC12H/202352527

Option 2: 3AWG Copper Wire, Up to 225ft distance, $9.58/ft

Copper 3AWG, 2 Black-Hot 1 White-Neutral:

Amazon: https://amzn.to/47Z4zni,
Home Depot: https://www.homedepot.com/p/Southwire-By-the-Foot-3-Black-Stranded-CU-SIMpull-THHN-Wire-24346999/204724930

Copper 6AWG, Ground Wire: https://www.homedepot.com/p/Cerrowire-100-ft-6-Gauge-Green-Stranded-Copper-THHN-Wire-112-4205CR/202564746
Conduit
- Schedule 80 PVC: 1.25” https://www.homedepot.com/p/1-1-4-in-x-10-ft-PVC-Schedule-80-Conduit-67587/100182626
- Schedule 40 PVC: 1” https://www.homedepot.com/p/Cantex-1-in-x-10-ft-Gray-Non-Metallic-PVC-Schedule-40-Conduit-A52BA12H/202352537

Option 1: 2AWG Copper Wire, Up to 290ft distance, $11.59/ft

Copper 2AWG, 2 Black-Hot 1 White-Neutral:

Amazon: https://amzn.to/47OYXuW ,
Home Depot: https://www.homedepot.com/p/Southwire-By-the-Foot-2-Black-Stranded-CU-SIMpull-THHN-Wire-20502199/204632781

Copper 6AWG, Ground Wire: https://www.homedepot.com/p/Cerrowire-100-ft-6-Gauge-Green-Stranded-Copper-THHN-Wire-112-4205CR/202564746
Conduit
- Schedule 80 PVC: 1.25” https://www.homedepot.com/p/1-1-4-in-x-10-ft-PVC-Schedule-80-Conduit-67587/100182626
- Schedule 40 PVC: 1” https://www.homedepot.com/p/Cantex-1-in-x-10-ft-Gray-Non-Metallic-PVC-Schedule-40-Conduit-A52BA12H/202352537

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