I ran into my guy John “John T” Tostanoski from EG4 at InterSolar Texas 2025, and you already know I had questions. Thank you to NABCEP for making this possible EG4 started as the go-to brand for DIY, RV, and off-grid setups… Now they’re stepping all the way into whole-home backup, residential, and even commercial with a full ecosystem: FlexBoss 21 whole-home inverter GridBoss MID / gateway with smart load shedding New 16 kWh indoor wall-mount LFP battery Long-term roadmap to domestic content batteries with LG cells built in Michigan and assembled in Texas Future three-phase commercial products on the way We break down how the system scales, how the batteries talk to each other, what’s changing in the pro-installer world, and why 100V architecture is a big deal for charge/discharge and cabling. If you’re a solar installer, designer, or DIYer leveling up to whole-home backup, this one’s for you. 00:00 – Intro: Watts Up Solar Podcast at InterSolar Texas 2025 00:31 – Why I’m a fan of EG4 (and how we met) 01:20 – From Signature Solar house brand to full-line OEM 02:18 – EG4’s evolution: RV / off-grid roots to residential & beyond 02:54 – Roadmap: three-phase commercial inverters (30 kW & 60 kW) 03:24 – Meet the ecosystem: FlexBoss 21, GridBoss & 16 kWh battery 03:44 – FlexBoss 21 overview: 21 kW DC input, 16 kW continuous with PV 04:30 – What the GridBoss MID actually does (microgrid, gateway, no islanding) 05:05 – Generator input, smart load shedding & multi-inverter support 05:25 – Scaling systems: paralleled inverters, code limits & storage caps 06:16 – New 16 kWh indoor wall-mount battery: what’s different 07:00 – Auto-addressing & active balancing for LFP batteries 07:45 – Ports, comms (CAN, RS-485) & parallel battery wiring explained 08:35 – Rack-mount batteries: 12V / 24V / 48V and use cases (RV, marine, golf carts) 09:44 – What’s coming in 2026 for EG4 & pro installers 10:20 – Third-party ownership, domestic content & IRA incentives 11:00 – EG4 + LG Energy Solution: Michigan cells, Texas assembly 11:45 – Domestic content battery + inverter timeline (May–June 2026) 12:10 – Why 100V architecture matters (smaller cables, better charge/discharge) 13:00 – 48V isn’t going away: supporting the existing ecosystem 13:25 – Closing: where to learn more about EG4 & how to connect 13:51 – Outro from InterSolar Texas 2025 – remember to “solar here 🔗 Connect & Learn More 👉 EG4: 👉 EG4 YouTube: search EG4 Electronics on YouTube 🎙 Watts Up Solar Podcast Subscribe on YouTube: @wattsuppod Listen on Spotify, Apple Podcasts, and more – just search “Watts Up Solar Podcast” 🔧 Fractional Training & Field Enablement If your company needs better installer training, fewer warranty claims, and smoother commissioning, connect with me: 🌐 SE Power Consulting –