Goal Zero 4800Wh Yeti Expansion Kit with Home Integration Kit (HIK) and Four Yeti Tank Expansion Batteries

Wired this into our panel with the HIK and now the fridge, furnace fan, and lights run during outages without a hiccup. Four Tanks stacked in the garage look clean and took an afternoon to hook up. Honestly the best money I've spent on the house in years.

I run an off-grid workshop and this expansion kit took my Yeti from a weekend tool to a genuine daily power system. The 4800Wh of added capacity runs my table saw, compressor, and lighting all day. The Home Integration Kit instructions were clear enough that my electrician finished in under three hours. Four Tanks balance the load nicely and the app reports total runtime accurately. Zero regrets.

Everything works exactly as advertised and setup with the transfer switch was straightforward. Just be warned — each Tank is a two-person carry. Docking one star only because the cabling could be labeled better.

Storm season used to mean scrambling for extension cords and spoiled food. Not anymore.

The hardware itself is excellent and capacity is exactly what we needed. The HIK wiring, however, definitely required a licensed electrician, which added cost I hadn't budgeted for. Plan for that and you'll be happy.

I'm 68 and my son helped me set this up, but honestly the connections were simple enough that I could have managed most of it myself. The four Yeti Tanks quietly sit next to the water heater and kick on the moment the grid drops. It ran our freezer and a window unit for nearly two days during the last outage. My late husband always wanted a generator like this — I wish he could see it.

Three of the four batteries were fine, but one Tank wouldn't hold a charge past 60%. Support was responsive and sent a replacement, but for a purchase this size I expected better QC. The system itself, once complete, works well.

Sold my gas generator after installing this. No fumes, no pull-cord, no fuel runs — just flip a switch when the power goes out and the house keeps humming.

4800Wh added to my existing Yeti is no joke — it carried our house through an 18-hour outage covering the fridge, wifi, and even the TV for the kids. The HIK integration works as promised. The app occasionally lags when syncing all four Tanks, but a restart fixes it. Would buy again.