EG4 FlexBOSS21 All-In-One Hybrid Inverter

The EG4 FlexBOSS21 hands you full control of your power, whether you're tied to the grid, backing it up, or living completely off it.

Why You'll Love The EG4 FlexBOSS21

1. Runs your whole home, even the big loads. With 16kW of continuous output and enough muscle to start a 5-ton air conditioner, you're never stuck choosing between the fridge and the AC when the power drops. Everyone stays comfortable, no compromises.
2. Three ways to power your life. Run fully off-grid, stay grid-tied with backup, or sell your extra solar back to the utility. You stop renting your power and start owning it.
3. It grows as you do. Pair up to 16 units for a massive 256kW and pull from three independent MPPTs feeding 21kW of solar. Buy what you need today and expand whenever you're ready.
4. Peace of mind, built in. Monitor and adjust everything from your phone over Wi-Fi, all housed in a weatherproof NEMA 4X enclosure and backed by a 10-year warranty. You're always in the loop, and always covered.

Your life, with the EG4 FlexBOSS21

Think back to the last time the power went out. The scramble for flashlights. The food slowly warming in the fridge. That nagging worry about how long it'll last.

Now picture the opposite. The grid drops, and inside your home nothing changes. The switchover happens in about 20 milliseconds — faster than you can blink — so the TV keeps playing and the AC keeps humming. You barely notice.

That's daily life with the EG4 FlexBOSS21. On sunny days it turns your roof into a power plant, topping up your batteries and trimming your bill. When utility rates climb, it can sell your surplus back to the grid. When a storm rolls through, it quietly keeps your family safe and comfortable.

Behind that simple experience sits a lot of smart engineering. It talks directly to your batteries through closed-loop communication, so charging stays safe and efficient. It accepts up to 600V of PV input, which means smaller cabling and often no combiner box — a cleaner, simpler install. And it pairs with the EG4 GridBOSS, so you manage your entire energy storage system from one place.

All of this runs at 97% efficiency and under 50dB of fan noise. It makes the most of the power you worked to generate, without the racket. That's what taking control of your energy actually feels like.