Anker is going up against Tesla in the home battery backup segment with Solix E10 that promises “whole-home backup” at an affordable price. The system delivers enough power to handle heavy-duty air conditioners and other high-power appliances in the event of a blackout. It also claims that the E10 supports DIY-friendly installation thanks to the stackable, plug-and-play design.

Each Anker Solix E10 unit can deliver up to 37.2kW of surge power and stacking two boosts that to 66kW. It also comes with a “turbo output” mode that can output 10kW per unit for 90 minutes maximum. That level of power, along with the minimal 20ms auto-switch time (from grid to battery), means you may not even notice if the power grid goes down.

For large installations, you can stack up to three E10 units to boost power to 90kWh, enough to provide whole home backup for up to 15 days (average US consumption is 30kWh per day so that might be stretching it). If that’s not enough, you can add Anker’s tri-fuel Solix Smart Generator 5500 that runs on gasoline, propane or natural gas and charges the E10 batteries via DC for maximum efficiency. The E10 can also handle up to 9kW of input from solar panels, or 27kW with three units.

Anker’s Solix E10 can be purchased with several optional components. The Power Dock allows auto switching from grid power in the even of an outage in 20 milliseconds, while the Smart Inlet Box provides a manual switchover option. The latter lets you charge the E10 batteries from the grid with existing solar systems to save money.

In the event of a wild storm, units are weatherproof thanks to the all-metal enclosures and can be operated in temperatures ranging from -4 to 131 degrees Fahrenheit.

As for pricing, the Solix E10 costs $4,299 by itself, $4,599 with the Smart Inlet Box, $5,799 with the Solix Power Dock and $7,399 with the Solix Power Dock and Smart Generator. Adding an extra E10 unit would boost the latter price to around $10,000. However, Anker claims lower installation costs for the Solix E10 than Tesla and other manufacturers due to its modular nature and says it’s so intuitive that some buyers could do a DIY installation. The Solix E10 is now available for pre-order.