7+ days. Continuous power during an outage. When the grid goes down, solar energy will continue to power your home and charge your Powerwall. Learn more.. - Tesla recently unveiled its new at-home battery option, Powerwall 2.0, but purchase for anyone lo.ng to convert their home to solar power.. - Most home solar batteries are designed to be "stackable," which To get the full picture, you also need to consider the battery 's power rating.. - Here 's our de.ed review of the new solar battery, including storage market and announced the launch of its home battery product, the Tesla Powerwall. you to maintain a sustained power supply during the day or night..