PowerNest R3

Last verified 2026-10-06.

• BIWATT describes the PowerNest R3 as a stackable sodium-ion battery.
• In its June 2026 release, BIWATT says the R3 has entered commercial delivery and that its sodium-ion products are deployed in more than 20 countries, mainly in Europe.
• Official R3 datasheet and Version 03 manual are now readable and name battery module PNR-4.5-03. They state 4.5 kWh capacity, but usable capacity is not established. Cycle life has no published retention endpoint. Round-trip efficiency and governing warranty terms for the R3 remain unestablished. Continuous power is held because the datasheet and newer manual conflict on stack current; the page remains evidence rather than a score.
• BIWATT says UL1973 certification and UL9540A testing for its sodium-ion products are still in progress, so no completed certification listing for the R3 is recorded here.
• The release headline describes the R5 and I3 as UL certified; it makes no such claim for the R3.
• This page is not joined to any scored or evidence record.
• The R3 datasheet gives 4.5 kWh per module, 45 V rated voltage, 100 A maximum continuous module current and recommended 90% depth of discharge. Four modules per stack and four parallel stacks are listed; 18 kWh and 72 kWh are configuration capacity totals, not tested usable energy. Recommended depth of discharge alone does not verify 4.05 kWh deliverable energy.
• The manufacturer states 5,000 cycles at 25 +/- 2 C, 0.5C charge/0.5C discharge and 80% depth of discharge. Neither reviewed parameter table gives a retained-capacity end-of-test threshold, so this is a conditional cycle claim rather than an independently verified lifetime or warranty entitlement.
• The image-only datasheet lists 200 A maximum parallel stack current and 33-59.25 V operation. The Version 03 manual released 26 February 2026 lists 250 A and 33-59.5 V. The catalogue dates the entries April/September 2025, which does not replace the manual printed release date. Continuous kW output cannot be settled by multiplying 45 V by a disputed stack current; no AC output or inverter efficiency is inferred.
• The detailed table permits charging from -20 C to +55 C and discharging from -30 C to +55 C. Its IP65 enclosure rating and lower-temperature marketing are not proof that charging is allowed at -30 C or that the system is fire-proof. The manual requires compatible inverter electrical parameters and prohibits series connection of these 45 V batteries.
• The manual describes RS485/CAN/Type-C communication. The product page makes remote maintenance and OTA updates conditional on a BIWATT inverter. The Type-C interface is for monitoring/configuration/maintenance, not power supply or charging external devices. Protocol access, security guarantees and VPP eligibility are not established here.
• The documents list CE/EN IEC 61000-6 and EN 62619, but no exact independent certification listing was recovered in this bounded technical-document review. The dated June release statement about UL1973/UL9540A remains distinct from those manufacturer table entries. No completed UL listing, local approval or current stock is inferred.
• These public technical sources were reviewed on 6 October 2026. The datasheet gate is closed, while usable capacity, cycle retention, efficiency, governing warranty and conflicted continuous power remain open. R2/R5/I3 limits and third-party directory values are not transferred. The publication identity fields and evidence-only status remain unchanged.

• 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-302808538.html

  BIWATT's own release names the stackable PowerNest R3 sodium-ion battery, says it has entered commercial delivery, says its sodium-ion products are deployed in more than 20 countries mainly in Europe, and says UL1973 certification and UL9540A testing are in progress.

• Same BIWATT release on PR Newswire APAC (Source: BIWATT)https://en.prnasia.com/releases/apac/biwatt-expands-sodium-ion-energy-storage-portfolio-with-ul-certified-nfpp-based-r5-and-i3-batteries-538379.shtml

  The APAC copy of the release, marked as sourced from BIWATT, prints the same PowerNest R3 name and commercial delivery statement and describes BIWATT's sodium-ion range as covering residential uses.

• BIWATT PowerNest R3 official product specificationshttps://www.biwattpower.com/r3

  Rendered public page names 4.5 kWh modules, four per stack/four stacks, 100 A module current and inverter-conditional OTA. No nominal-to-usable conversion or independent certification assumed.

• BIWATT public document catalogue: R3 technical sourceshttps://www.biwattpower.com/document

  Observed entries: R3_EN datasheet, 22 April 2025; R3 user manual, 4 September 2025. Catalogue dates differ from printed Version 03 manual release of 26 February 2026.

• BIWATT R3 datasheet public download resolver, document 13https://www.biwattpower.com/gateway/front/website/document/13?lang=en

  Public unauthenticated catalogue resolver yields the current manufacturer PDF; both image-only pages read. PNR-4.5-03, 4.5 kWh, cycle conditions and 200 A stack limit. Temporary download signatures are not retained.

• BIWATT R3 manual public download resolver, document 68https://www.biwattpower.com/gateway/front/website/document/68?lang=en

  Version 03, released 26 February 2026. Physical page 7 gives PNR-4.5-03 parameters and 250 A stack limit, conflicting with datasheet 200 A. Public resolver; no private serial/warranty endpoint accessed.