• Description

EG4 System Management Kit (Inverter & MID)

Transform your power system with the EG4 System Management Kit, featuring the FlexBOSS21 Hybrid Inverter and GridBOSS MID. This powerhouse combination delivers unmatched performance, efficiency, and simplicity for both on-grid and off-grid applications, tailored for residential and commercial systems of any size.

Why this product is a must-have:

The EG4 System Management Kit is essential for maximizing energy independence and reliability, offering seamless integration of solar energy systems while reducing installation complexity and costs.

Standout Qualities:

  • High PV Input Capacity: FlexBOSS21 boasts a groundbreaking 21kW PV input capacity with 3 MPPTs, supporting multi-orientation solar arrays.
  • Smart Load Management: Advanced features allow for optimized energy flow and responsive operation, ensuring safety and scalability.
  • Real-Time Monitoring: In-depth remote monitoring via updated EG4 software provides unparalleled control and visibility over your power system.
  • Cost-Effective Design: The GridBOSS MID consolidates multiple components into one unit, reducing installation costs and complexity.
  • Reliable Performance: Capable of handling whole-home backup power, micro-grids, and sophisticated solar energy storage solutions, ensuring your energy needs are met.

Tech Specs | FlexBOSS21

  • SKU: INV027
  • Max. AC Input Power: 12000W
  • Output Power (with PV): 16000W @ 240V
  • Max. PV Input: 25000W
  • Efficiency: 94 - 97%
  • Operating Environment: -13ºF to 140ºF
  • Weight: 88 lbs (40 kg)
Spec Sheet:
User Manual:
UL1741 Certificate:

Tech Specs | GridBOSS MID

  • SKU: CNT103
  • Max. Continuous Current: 200A
  • Supported Inverters: EG4 12kPV, 18kPV, & FlexBOSS21
  • Operating Temperature Range: -40ºF to 140ºF
  • Weight: 55 lbs (25 kg)

Spec Sheet: Click Here

User Manual: Click Here

System Wiring Diagrams: Click Here

What's Included:

  • 1 x EG4 FlexBOSS21 Hybrid Inverter

  • 1 x EG4 GridBOSS

  • User Manuals & Any Related Certifications

  • Fast, Reliable Shipping

  • Lifetime Customer Support

Product Specifications:

EG4 FlexBoss Specifications
Compatible Battery Types Lead-acid/ Lithium
Max. Charge/Discharge Power 12000W
Nominal Voltage 48VDC
Voltage Range 40 – 60 VDC
Recommended Battery Capacity Per Inverter >300Ah
Max Units in Parallel 16
Product Dimensions (HxWxD) 30.43 × 22.28 × 11.22 in. (750 × 520 × 285 mm)
Unit Weight 88 lbs. (52 kg)
Design Topology High Frequency – Transformerless
Relative Humidity 0 – 100%
Operating Altitude <6561 ft (<2000 m)
Operating Ambient Temperature Range -13° – 140°F (-25° – 60°C)
Storage Ambient Temperature Range -13° – 140°F (-25° – 60°C)
Noise Emission (Typical) <50dB @ 3 ft
Communication Interface RS485/Wi-Fi/CAN
Standard Warranty 10-year standard warranty*
Outdoor Rating NEMA 4X
EG4 GridBOSS Specifications
Communication Interface RS485/Wi-Fi/CAN
Internal Bus Rating 350A
Internal Fuse Rating 315A
Operating Altitude <6561 ft (<2000 m)
Relative Humidity 0 – 100%
Outdoor Rating NEMA 3R
Operating Ambient Temperature Range -40°F – 140°F (-40°C – 60°C)
Product Dimensions (HxWxD) 31.5×19.7×7 in (800×500×178 mm)
Unit Weight 55 lbs. (25 kg)
Standard Warranty 10-year standard warranty

Frequently Asked Questions

Yes! We provide free and fast shipping on MOST orders within the continental United States. However, some specific brands and items will require a quote. You can live chat or call us for a quote
Most orders ship out within 1–2 business days and arrive within 3–5 business days depending on your location.
We offer easy returns as long as your item meets the conditions outlined in our Return Policy. Items must be unused, in original packaging, and returned within the specified return window.
Absolutely! Our in-house product experts are here to help. Live chat or call us 513-743-829 for personalized advice before or after your purchase.
Yes. All products include any applicable manufacturer warranties, and we’ll help you handle any warranty claims if needed.
Yes, we only sell 100% authentic, brand-new products, sourced directly from our manufacturers or authorized distributors.
REAL REVIEWS, REAL RESULTS

Feedback From Our Customers

At Green Vista Living, we pride ourselves on delivering top-quality products and exceptional service to solar professionals and homeowners alike. Here's what our customers have to say about their experiences with us.

Kevin Leary
May 18, 2025
★★★★★

Incredible Tech Support from Anees of Green Vista Living. Exceptional service and went above and beyond on every question.

Bryan Cunningham
Off grid Kit • Dec 21, 2025
★★★★★

Shipment was slow due to high demand, but the team kept me informed and ensured everything arrived properly.

Related Products