EG4 Hybrid Power Kit: 16 kW Hybrid Inverter with 14.3 kWh PowerPro Wallmount Battery

The EG4 Hybrid Power Kit is a durable, scalable energy storage and backup power solution for medium to large homes and commercial properties. The bundle integrates a 16 kW FlexBOSS21 Hybrid Inverter with a 14.3 kWh PowerPro Wallmount Outdoor Battery, delivering reliable 120/240 V AC output from a 48 VDC energy store. Designed to smooth demand, provide seamless outage protection, and support grid stability, this system enables efficient load shifting and resilient operation in diverse weather and usage patterns.

Performance and electrical specifications

• PV input: up to 21 kW usable, up to 24 kW maximum input
• On-grid AC output: continuous 16 kW at 240 V; 13.8 kW at 208 V
• With PV/battery: 16 kW to grid or load; without PV: 12 kW to loads/battery
• AC output: nominal current 50 A; nominal voltage 120/240 V, 120/208 V, 240 V
• Continuous output power: 12,000 VA
• Operational capability: easily starts a 5-ton AC unit
• Inverter dimensions/weight: 30.4 × 22.3 × 11.2 in.; 88 lb
• Battery: 51.2 V, 280 Ah; 34.6 × 22.3 × 9.1 in.; 308.6 lb
• Storage capacity: 14.3 kWh; design life 8000 deep cycles; UL 1973 certified

Safety, certifications, and system integration

The PowerPro WallMount Outdoor Battery is UL 1973 certified and designed to operate within EG4’s GridBOSS–compatible ecosystem, promoting safe, coordinated operation with minimal backfeed risks. The hybrid inverter and battery deliver protections common to modern ESS platforms, including thermal monitoring, short-circuit safeguards, over-current protection, and battery management integration to maximize cycle life and performance.

Installation and maintenance

Professional installation by a licensed electrician is required. The system is optimized for 120/240 V or 120/208 V service, with a compact outdoor wall-mount battery form factor for versatile placement. Regular maintenance focuses on ensuring secure DC and AC connections, verifying BMS communications, and periodic checks of ventilation and overall enclosure integrity. The design supports fast commissioning when paired with EG4’s GridBOSS gateway, reducing on-site time.

Warranty and service

The inverter assembly carries a 10-year warranty. The PowerPro WallMount Battery is built for long life with rapid availability of replacement parts and support through EG4’s authorized service network.

EG4 Hybrid Power Kit | 16kW 120/240V Output 48VDC - 14.3kWh System Bundle | EG4 FlexBOSS21 Hybrid Inverter + EG4 PowerPro Wallmount Outdoor Battery

This EG4 bundle includes (1) 16kW FlexBOSS21 Hybrid Inverter and (1) 14.3kWh PowerPro Wallmount Outdoor Battery. Built for durability and dependable performance, this powerful system provides continuous power for medium to large homes or commercial properties. Featuring advanced technology and substantial energy storage, it safeguards against outages and blackouts, offering a smooth, efficient, and reliable energy solution you can depend on.

The EG4 FlexBOSS21 is a split phase, all-in-one, hybrid inverter designed for the residential and small commercial markets. With a 21kW usable PV (DC) input, the FlexBOSS21 provides high power output, generating 12kW of AC power during non-sunlight conditions and a full 16kW AC with solar PV gain. It is a powerful and versatile inverter which can feed-through 90 Amps of utility power from the grid at 120/240 VAC. 

The FlexBOSS21 is an enhanced cousin to EG4’s flagship 18kPV inverter that has been designed to optimally work with EG4’s GridBOSS MID (power gateway). The combination of FlexBOSS21 and GridBOSS significantly reduces installation expenses by replacing unnecessary components and reducing installation time. This makes the FlexBOSS21-GridBOSS combination an unbeatable choice for customers looking to build powerful, cost-effective and scalable solar systems. 

The EG4 PowerPro EG4’s versatile Energy Storage Systems (ESS) store energy from renewable sources for times of low availability, power loads during grid outages, and shift grid usage to off-peak hours (or peak shave). Additionally, they contribute to grid stability by smoothing out demand, reducing peak loads that strain the grid. Key components of an ESS include batteries, a Hybrid inverter, a solar charge controller, and solar panels, alongside Balance of System components like wires and fuses. 

Product Specifications

EG4 FLEXBOSS21 16kW 48V Hybrid Split Phase Inverter/Charger Product Specifications

EG4 PowerPro WallMount AllWeather Lithium Battery | Product Specifications

Voltage: 51.2V
Capacity: 280Ah
Dimensions: 34.6 × 22.3 × 9.1 in. (88 × 56.6 × 23.2cm)
Weight: 308.6 lbs. (140 kg)
Design Life: 8000 Deep Cycles
Certs: UL 1973
Lifetime Production: 82.6MWh

Product Manual

EG4 FLEXBOSS21

EG4 Product Manual
EG4 Specs Sheet

EG4 PowerPro WallMount Battery Product Manuals

EG4 WALLMOUNT ALL WEATHER BATTERY – QUICK-START GUIDE V1.1

EG4 WALLMOUNT ALL WEATHER BATTERY – MANUAL V1.3.1

EG4 WALLMOUNT ALL WEATHER BATTERY – SPEC-SHEET V1.1.2

EG4 WALLMOUNT ALL WEATHER BATTERY – BROCHURE

Product Warranty

EG4 Product Warranty

EG4 Electronics offers a 10-year Full Parts Replacement or Full Product Replacement Warranty from the date of original inverter (EG4 18kPV-12LV) purchase.

Your warranty must be registered within the first year of purchase or provide proof of purchase from an EG4 authorized distributor to remain valid. If you choose not to register or cannot provide proof of purchase, your warranty may be invalidated.

This limited warranty is to the original purchaser of the product and is one time transferable only if the product remains installed in the original installation location. All parts exchanges are covered during the warranty period. Outside of the continental US, replacement shipping charges may apply.

Product that is not purchased through an EG4 approved vendor is not covered under this warranty. A list of approved vendors can be found on our website. Reselling or removing the product from the original installation site will void the warranty.

Warranty Exclusions – EG4 Electronics has no obligation under this limited warranty for products subjected to the following conditions (including but not limited to):

1. Damages incurred during installation/reinstallation or removal
2. Poor workmanship performed by an individual, installer, or a firm
3. Damages caused by mishandling the product or inappropriate environmental exposure
4. Damages caused by improper maintenance or operating outside the specified operating conditions
5. Tampering, altering, and/or disassembly of the product
6. Using product in applications other than what the manufacturer intended
7. Lightning, fire, flood, earthquake, terrorism, riots, or acts of God
8. Any product with a serial number that has been altered, defaced, or removed
9. Any unauthorized firmware updates/upgrades/patches
10. Damages incurred from a voltage or current spikes due to open-loop lithium battery communications

EG4 product warranty is a limited warranty – EG4 limits its liability in the event of a product defect to repair or replacement in accordance with the terms of this limited warranty. EG4 is not responsible for any additional or indirect damages that may arise from the malfunctioning of the product. These damages could be incidental or consequential, including without limitation, any liability for the loss of revenue, profits, or time. EG4 shall not be liable for any direct or indirect loss of life, including but not limited to bodily injury, illness, or death arising from the misuse or mishandling of the product, whether caused by negligence or otherwise.

Product FAQs

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