What Size Generator or Battery Backup Do You Need for a House? After 20 years wiring homes and sizing backup systems, here’s the truth: most people overbuy. You don’t need to power your entire house during an outage — you need enough capacity to run critical loads until the grid comes back or the sun […]

Can You Add Battery Backup to an Existing Solar System? Yes, you can absolutely add battery backup to an existing solar system—I’ve helped dozens of homeowners do exactly that. The real question isn’t “can you?” but “how complex will it be?” and that depends entirely on what kind of inverter you currently have. After 20

Portable Power Station vs Home Battery: Which Backup Option Makes Sense? Here’s the straight answer: portable power stations are great for backup power under 5 kWh and situations where you need flexibility, while whole-home batteries make sense if you need daily cycling, 10+ kWh capacity, and you’re already installing solar. I’ve wired both systems for

How Long Can a Home Battery Run a Refrigerator During an Outage? A typical 10 kWh home battery can run a standard refrigerator for 50-100 hours during an outage, depending on your fridge’s efficiency and how often you open the door. After two decades as a licensed electrician and installing solar-plus-storage systems since 2019, I’ve

The Best Solar Batteries for Home Backup: What 200+ Install Jobs Taught Me I’ve spent two decades as a licensed electrician and helped over 200 homeowners set up solar systems since 2019. The most common question I get isn’t about panels—it’s about batteries. Which ones actually work when the power goes out? Here’s what I

I’ve walked over 200 homeowners through battery sizing, and the biggest mistake I see? People either overbuy massive systems they’ll never use, or undersize so badly they’re back on grid power within an hour. Here’s how to actually size a home battery backup system that matches your real needs. The short answer: multiply your essential

I’ve installed battery backup systems in over 60 homes since 2019, and I can tell you right now: the “best” system depends entirely on whether you need whole-home backup during multi-day outages or just want to keep your fridge and wifi running for a few hours. Here’s what actually matters after seven years of watching

The Math Behind Battery Backup Runtime A fully charged 13.5 kWh home battery like the Tesla Powerwall will run essential circuits in an average home for 12-24 hours — but that’s if you’re smart about what you keep on. Try running your whole house like normal and you’ll burn through it in 4-6 hours, maybe

I’ve installed both systems in my own consulting work, and here’s the truth: Tesla Powerwall wins on capacity and software, but Generac PWRcell offers modular flexibility that can save you thousands if you size it right. Let me walk you through the real differences that matter. After two decades wiring homes and five years watching

How Much Does a Home Battery System Cost? Full 2026 Price Breakdown A complete home battery system costs between $10,000 and $25,000 installed in 2026, with most homeowners paying around $15,000-$18,000 for a 13-15 kWh system. After 20 years as a licensed electrician and installing solar on my own home in 2019, I’ve helped over

Since installing my 8.5kW solar array in October 2024, I’ve fielded the same two questions from neighbors more than any others: “Which battery did you go with?” and “Should I get a Powerwall or that Generac one?” I’m Mike, a 44-year-old homeowner in Columbus, Ohio with 20 years as a licensed electrician. I track every

Affiliate disclosure: This post contains affiliate links. If you purchase through these links, I may earn a small commission at no extra cost to you. I only recommend products I’ve personally installed or vetted. I’ve wired up more home battery systems than I can count at this point — everything from cheap portable stations to