Enphase Energy System with IQ8™ solar microinverters can provide backup power during a power outage using only sunlight, even without a battery

https://finance.yahoo.com/news/enphase-energy-launches-iq8-industry-120000818.html

"Many homeowners often assume their solar systems will function if the sun is shining, even during a power outage. This has unfortunately not been true until today... comes in four different configurations: the first is Solar Only; the second is Sunlight Backup with no battery; the third is Home Essentials Backup with a small battery; and the fourth is Full Energy Independence with a large battery... Enabling a customer to start with any size Enphase battery [or no battery at all] and grow over time"

Related:

Generac PWRcell Systems
https://www.electricgeneratorsdirect.com/power/generac-pwrcell.html

Northern Arizona Wind and Sun
https://www.solar-electric.com/residential/batteries-battery-storage.html

The Geneverse PowerPillar is Now Available to Solar Installers and Distributors
https://www.altenergymag.com/news/2023/08/22/the-geneverse-powerpillar-is-now-available-to-solar-installers-and-distributors/39997/

Ritter Communications Selects ATX’s Areca Energy Storage for Next-Gen Standby Power Operations

https://www.businesswire.com/news/home/20231011113768/en/Ritter-Communications-Selects-ATX%E2%80%99s-Areca-Energy-Storage-for-Next-Gen-Standby-Power-Operations

Hillcrest Energy Technologies Achieves Breakthrough in EMC Chamber Testing with European Automotive OEM

https://greenstocknews.com/news/otcmkts/hlrtf/hillcrest-achieves-breakthrough-in-emc-chamber-testing-with-european-automotive-oem