EG4 FlexBOSS21 Inverter & EG4 Gridboss Bundle | 21kW PV Input | 48V Split Phase
Estimated Delivery Between
and .
Order within to get it by the earliest date.
Free Shipping In The USA | Call Us: 877-556-3347
Free Shipping In The USA | Call Us: 877-556-3347
Share it with us now and we will beat it. Get the best deal online, guaranteed!
and .
Order within to get it by the earliest date.
Build Your Perfect Off-Grid Rig With Our System Calculator
Visit Calculator
EG4 FlexBOSS21 All-in-One Hybrid Solar Inverter
The EG4 FlexBOSS21 hybrid solar inverter is a flexible 48V split-phase inverter/charger that delivers the reliable power of the 18kPV with added adaptability. It is powerful enough to start a 5-ton AC unit and supports 21kW of PV input. With the ability to parallel up to 10 units, the FlexBOSS21 achieves an impressive total continuous output of 160kW using PV input. Equipped with three MPPTs, it provides optimal solar management, while the enhanced EG4 monitoring software offers complete remote control, including mobile alerts and remote settings adjustments. Its integration with GridBOSS ensures comprehensive management of the entire Energy Storage System (ESS).
EG4 GridBOSS Micro-Grid Interconnection Device (MID)
The EG4 GridBOSS MID streamlines your Energy Storage System (ESS) by combining up to 10 components into one robust unit. It is designed for seamless integration with utilities, generators, inverters, and loads, providing centralized control, straightforward installation, and real-time remote monitoring.
Kit Type: Residential
Off Grid Applications: Standard Home System (Off-Grid Homes, Cabins, Homesteads)
Hybrid Applications: Standard Home System (3-4 Bedrooms)
The EG4 FlexBOSS21 is a versatile 48V split-phase, hybrid inverter/charger that offers the same dependable power as the 18kPV with enhanced flexibility. Powerful enough to start a 5-ton AC unit, the FlexBOSS21 supports 21kW of PV input. Capable of paralleling up to 10 units together, the FlexBOSS21 has an impressive total output of 160kW. Three MPPTs give users optimal control over their solar needs, while the updated EG4 monitoring software allows for convenient total remote management, complete with mobile notifications and remote setting. Seamless interaction with GridBOSS gives users control over their entire Energy Storage System (ESS).
Features:
The EG4 GridBOSS MID simplifies your Energy Storage System (ESS) by consolidating up to 10 components into a single, powerful unit. Designed to seamlessly connect utilities, generators, inverters, and loads, it offers centralized control, easy installation, and real-time remote monitoring.
Features:
Everything you need is included with your product.
| Specification | Details |
| 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 |
| Specification | Details |
| 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 |
Can the EG4 FlexBOSS21 operate both off-grid and grid-tied?
Yes! The FlexBOSS21 is a hybrid inverter, allowing full off-grid independence or grid-tied operation with battery backup for enhanced energy flexibility.
What is the function of the EG4 GridBoss system?
The GridBoss intelligently manages loads by prioritizing solar and battery power before utilizing grid energy, optimizing efficiency and cost savings.
Can I expand my system for more power?
Yes! The FlexBOSS21 supports parallel operation, allowing users to stack multiple units for greater energy needs.
Does it support remote monitoring?
Absolutely! The Wi-Fi and RS485 connectivity allow real-time monitoring and control via the EG4 app.
Shipping is FAST & FREE across the US. Read our full Shipping Policy here.
We offer market leading Easy 30 Day Returns. Read more about our Returns Policy here.
We get it. You've got a lot of choices when it comes to online retailers. Here's why we think you should shop with us at Off-Grid Source.
Trusted By 10,000+ Customers. See All Reviews.
I was a DIY solar power wannabe... that is 'til I connected with Manny... The man's a prince! He not only knows his stuff; he walked me through all things electrical. To make sure I had all I needed... he gave me his cell phone # to text him anytime I got confused... nights and weekends included. The prices were very competitive... definitely go with Manny -- you won't go wrong!
Bruce D.
I am always hesitant to buy things at places I have never shopped... I want to give a shout out to Manny who with great patience and knowledge helped me get my orders... I felt valued as a customer and I will definitely be back in the future. I highly recommend them, they make you feel like family.
Jennene A.
I'm about to go off grid. I called Manny, he walked me through everything so I could truly understand what I needed and never tried to upsell me. He was honest and made a customer for life.
Ray B.
I would personally like to thank Manny... I purchased the inverter and decided I needed to return it... Manny was very understanding and went out of his way to help me return the product and not even have to pay for shipping return. He gives this company reputation, honor and quality customer service!
Roger V.
I have been talking with Manny the owner... He has not only helped me design a system but he's been assisting with the install and components. I am super pleased so far with the assistance.
Jeff S.
We added 2 more batteries to our current set up. Pleased with the customer service from Off-Grid Source! Will be back!
Jason
Very fast response times. Very professional. I highly recommend!
Ray W.
Sign up for emails and get exclusive offers, new product drops, and expert advice to help you build the right solar setup with confidence.