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From DIYer/RV solar to whole-home backup — EG4’s glow-up explained
Send us a Text to Watts Up Solar Podcast!
At InterSolar Texas 2025, I caught up with John Tostanoski from EG4, and we went deep on where the brand is headed next.
EG4 built its name on making solar accessible – RVs, off-grid cabins, and DIY systems that regular people could actually understand and install.
Now they’re stepping into a much bigger arena:
- FlexBoss 21 whole-home backup inverter (21 kW DC input, 16 kW continuous with PV)
- GridBoss microgrid interconnection device (MID) with smart load shedding and generator support
- New 16 kWh indoor wall-mount LFP battery with auto-addressing and active balancing
- Long-term roadmap to three-phase commercial products
- A domestic content battery built with LG cells made in Michigan and assembled in Commerce, Texas
- Future 100V architecture for better charge/discharge performance and smaller cabling
We talk about:
- How EG4 evolved from a house brand at Signature Solar to a full OEM
- Why domestic content matters for third-party ownership and financing
- What pro installers need to know about EG4’s ecosystem
- How you can scale FlexBoss, GridBoss, and multiple batteries within code limits
- Why 48V isn’t going away anytime soon, even as 100V systems emerge
Suppose you’re a solar installer, designer, distributor, or advanced DIYer thinking about whole-home backup or domestic content requirements. In that case, this episode will give you a clear picture of where EG4 is heading.
Connect with EG4:
Website: eg4electronicsics.com
YouTube: EG4 Electronics
Connect with Emmitt:
Watts Up Solar Podcast on YouTube: @wattsuppod
Fractional Training & Field Enablement: sepowerconsulting.com
Hit follow, rate the show, and share this episode with someone who’s speccing batteries and inverters all day. The more the industry understands the tech, the better the installs
Our Sponsor for this Episode is S.E. Power Consulting
S. E. Power Consulting offers Fractional Training Leadership—meaning you get expert-level training support when you need it, without the cost of a full-time hire.
Whether you’re scaling up or just getting organized, we help you train smarter, not harder.
Visit SEPowerConsulting.com to learn more.
S.E. Power Consulting—Fractional training. Full-time results.
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By Emmitt MucklesSend us a Text to Watts Up Solar Podcast!
At InterSolar Texas 2025, I caught up with John Tostanoski from EG4, and we went deep on where the brand is headed next.
EG4 built its name on making solar accessible – RVs, off-grid cabins, and DIY systems that regular people could actually understand and install.
Now they’re stepping into a much bigger arena:
- FlexBoss 21 whole-home backup inverter (21 kW DC input, 16 kW continuous with PV)
- GridBoss microgrid interconnection device (MID) with smart load shedding and generator support
- New 16 kWh indoor wall-mount LFP battery with auto-addressing and active balancing
- Long-term roadmap to three-phase commercial products
- A domestic content battery built with LG cells made in Michigan and assembled in Commerce, Texas
- Future 100V architecture for better charge/discharge performance and smaller cabling
We talk about:
- How EG4 evolved from a house brand at Signature Solar to a full OEM
- Why domestic content matters for third-party ownership and financing
- What pro installers need to know about EG4’s ecosystem
- How you can scale FlexBoss, GridBoss, and multiple batteries within code limits
- Why 48V isn’t going away anytime soon, even as 100V systems emerge
Suppose you’re a solar installer, designer, distributor, or advanced DIYer thinking about whole-home backup or domestic content requirements. In that case, this episode will give you a clear picture of where EG4 is heading.
Connect with EG4:
Website: eg4electronicsics.com
YouTube: EG4 Electronics
Connect with Emmitt:
Watts Up Solar Podcast on YouTube: @wattsuppod
Fractional Training & Field Enablement: sepowerconsulting.com
Hit follow, rate the show, and share this episode with someone who’s speccing batteries and inverters all day. The more the industry understands the tech, the better the installs
Our Sponsor for this Episode is S.E. Power Consulting
S. E. Power Consulting offers Fractional Training Leadership—meaning you get expert-level training support when you need it, without the cost of a full-time hire.
Whether you’re scaling up or just getting organized, we help you train smarter, not harder.
Visit SEPowerConsulting.com to learn more.
S.E. Power Consulting—Fractional training. Full-time results.