Cited sources
Last verified 2026-09-25.
- BIWATT describes the PowerNest R5 as a residential storage battery built on its dedicated sodium-ion platform, with the release headline calling it NFPP-based.
- BIWATT unveiled the R5 at Intersolar Europe 2026; the release says the earlier PowerNest R2 and R3 have entered commercial delivery but gives no delivery timing for the R5, so it is treated here as announced.
- The release headline uses the words UL-Certified, but its body says UL1973 certification and UL9540A testing for BIWATT's sodium-ion products are still in progress, so no UL listing for the R5 is established.
- It cannot be scored yet because the release gives no capacity, power rating, round-trip efficiency, cycle life or warranty terms for the R5.
- The release's figure of more than 20 countries of deployment refers to BIWATT's sodium-ion products generally, not to the R5, and this record is not joined to the R2 or R3.
- BIWATT press release via PR Newswire, 24 June 2026https://www.prnewswire.com/news-releases/biwatt-expands-sodium-ion-energy-storage-portfolio-with-ul-certified-nfpp-based-r5-and-i3-batteries-302808510.html
BIWATT's own release (source: Biwatt) names the PowerNest R5 as a residential sodium-ion battery unveiled at Intersolar Europe 2026 and says UL1973 certification and UL9540A testing are still in progress.
- BIWATT press release via PR Newswire APAC, 24 June 2026https://en.prnasia.com/releases/apac/biwatt-expands-sodium-ion-energy-storage-portfolio-with-ul-certified-nfpp-based-r5-and-i3-batteries-538379.shtml
The same BIWATT-issued release on the APAC wire confirms the PowerNest R5 name and its NFPP-based sodium-ion headline, and says the earlier R2 and R3 have entered commercial delivery.