The EG4 FlexBOSS18 keeps your home running on Solar.
Why You'll Love The EG4 FlexBOSS18
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Serious power at an entry-level price. You get 13kW with solar and enough startup muscle to fire up a 5-ton AC or a big well pump — premium hybrid-inverter performance without the premium price tag.
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Three ways to power your life. Run fully off-grid, stay grid-tied with backup, or sell your extra solar back to the utility. The EG4 FlexBOSS18 flexes to fit your goals and helps you stop handing money to the power company.
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Built to grow with you. Harvest up to 18kW of solar across two independent MPPTs, then add more units in parallel as your needs expand. Start right-sized today, scale up whenever you're ready.
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Peace of mind, built in. Manage everything from your phone over Wi-Fi, all sealed 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 FlexBOSS18
Maybe you've watched your electric bill creep up year after year and thought there has to be a better way. Or maybe the last big storm left you in the dark, wishing you had a backup you could count on.
The EG4 FlexBOSS18 is how you take that control back. On sunny days, your panels cover your loads and top up your batteries. When rates climb in the evening, you lean on stored power instead of the grid. And when an outage hits, the switch to battery happens in about 20 milliseconds — so your fridge, your Wi-Fi, and your peace of mind stay right where they are.
It's the more affordable, entry-level counterpart to the FlexBOSS21, but it never feels entry-level when it's running your house. Under the hood it's genuinely smart. It talks to your batteries through closed-loop RS485 and CANBus communication, so charging stays safe and efficient. It takes up to 600V of solar input, which usually means smaller cabling and no combiner box. And its two MPPTs let you run panels across different roofs, angles, or shade without losing harvest.
It's ready for real life, too. A 90A grid pass-through and AUX terminals for automatic generator start keep your backup seamless. Paired with EG4 batteries, its total rapid shutdown de-energizes the whole system — so there are no extra battery disconnects to buy or wire. The NEMA 4X enclosure shrugs off rain, dust, humidity, even coastal salt spray, all while running under 50dB so you barely know it's there.
Pair it with the EG4 GridBOSS and you manage your entire energy storage system from one place — critical loads, generator, and smart loads included. That's energy independence that actually fits your life, and your budget.
The EG4 FlexBOSS18 in a nutshell:
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18kW solar input across two MPPTs — capture more sun and design around shade, angles, and multiple roof faces.
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13kW with solar, 10kW from batteries alone — plenty of muscle to run a home, with the punch to start a 5-ton AC.
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Near-instant backup (about 20ms) with a 90A transfer switch — outages come and go without your appliances noticing.
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Total rapid shutdown, arc-fault and ground-fault protection — NEC 2020-ready safety that looks after your home and everyone in it.
