3/6

Tesla Powerwall

Available only by consultation through the company’s website, the Tesla Powerwall is an integrated system that includes battery storage, inverter and WiFi functionality. You can interact with it via your mobile device or laptop.

The Powerwall has a power rating of five kW, but units can be stacked to supply up to 35 kW. Its smart technology makes the Powerwall suited primarily for grid-tied systems. Because it employs energy-dense NMC technology, it needs to be in the garage or an outbuilding. It comes with a 10-year or 10,000-cycle warranty.

4/6

Generac PWRcell

The Generac PWRcell is a modular battery that comes with a minimum of three cells with a storage capacity of nine kWh. It can be upgraded to increase storage capacity to 18 kWh. This battery must be installed at the same time as the panels; it can’t be tied in afterward.

The PWRcell comes with an external inverter and automatic transfer switch. The weatherproof cover means it can be safely installed outside.

5/6

Sunrun Brightbox

Unlike the other batteries on this list, the Sunrun Brightbox is available only to homeowners who also purchase panels from the company. This battery is part of the LG Chem RESU series. LG exited the solar industry in 2022, leaving Sunrun as the exclusive distributor.

The Brightbox compares favorably to the Tesla Powerwall, although at 9.3 kWh it has slightly less power. It has enough capacity to keep things running for at least 10 hours during a power outage. Because the company delivers the entire package, a consultation is necessary to determine system size and configuration.