PowerNest R5

Last verified 2026-10-06.

• 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 June release headline uses UL-Certified while its body says UL1973 certification and UL9540A testing are in progress. The subsequently recovered official R5 sheet claims UL1973 and references UL9540A, but supplies no exact independent listing/report in the reviewed source set. No completed UL listing for this exact product is established by this review.
• The R5 datasheet now names PNR-4.5-40 and states 3 kW maximum continuous battery power; the maker policy explicitly covers the R5 family for five years of conditional hardware warranty. The page remains unscored because usable capacity is not established, cycle life lacks a retained-capacity endpoint and round-trip efficiency is not established.
• 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.
• Shenzhen Biwatt Technology Co., Ltd. and its affiliates are the warrantor. The current maker-linked policy is dated 10 August 2026 in its footer, although the catalogue entry was created on 2 August 2025. It covers R2/R3/R5/I3 sodium-ion batteries for five years; this is hardware/material/workmanship coverage, not a 5,000-cycle, retained-capacity or throughput warranty.
• Commencement is the earlier of on-site installation/activation/registration and retailer invoice or written evidence of delivery to the installation site. If neither date can be determined, commencement is six months after manufacture. The policy gives no explicit sales/delivery effective-date cohort and warns that local distributors may offer a separate warranty; individual or local entitlement is not established by this review.
• The warranty requires a trained installer and compliance with the manual, ventilation and storage conditions. It requires operating ambient temperature between -20 C and +55 C, storage at 0-35 C and specified SOC/maintenance conditions. Equipment within 500 metres of the coast, or installed outdoors without BIWATT-approved outdoor cabinets, is excluded. A technical enclosure rating or lower discharge-temperature claim does not remove those warranty conditions.
• Claims must be made within 30 days of failure, normally through the BIWATT app with requested contact, model/serial, installation/failure, error and troubleshooting information. The policy offers installer/national-office contact if the app route is unavailable. Offline products require claimant-assisted on-site inspection/data collection; remote diagnosis and firmware updates may interrupt operation. No customer, serial or purchase record was queried.
• BIWATT chooses configuration/software correction or replacement/exchange with a new, refurbished, functionally equivalent or superior unit. Repair/replacement coverage lasts for the original remaining term or six months, whichever is longer. Removed hardware becomes BIWATT property, and uncovered claims may incur a handling fee. Transfer is permitted only while the device remains at its original installation location.
• Unless a separate agreement applies, the limited warranty covers necessary hardware material costs and excludes all other costs. Its on-site replacement wording does not establish unconditional labour, freight or removal/reinstallation reimbursement. Lost generation and consequential losses are excluded subject to applicable statutory rights, which the policy expressly preserves. Unauthorised repairs, incompatible third-party components, transport damage, exceeded temperatures and specified extraordinary events are among its exclusions.
• The recovered official datasheet names Battery R5 (PNR-4.5-40), a stacked NFPP sodium-ion battery with a listed 4.5 kWh capacity. Recommended depth of discharge is 90%; usable capacity is not established by a stated energy-delivery test, and 4.05 kWh is not entered as measured usable energy.
• The battery table explicitly states 3 kW maximum continuous power, 55 A maximum continuous module current, 220 A maximum parallel stack current and operating voltage of 58 V +/- 1 V. The optional hybrid inverter is a separate single-phase 6 kW rated-output component. These two kW ratings are not interchangeable; no combined stack or AC-system rating is inferred.
• The sheet states 8,000 cycles at 25 +/- 2 C, 0.5C charge/0.5C discharge and 80% depth of discharge. The cycle claim lacks a retained-capacity endpoint, and round-trip efficiency is not established. Neither the cycle headline nor recommended DoD creates a performance-warranty promise.
• Technical charging temperature is -20 C to +55 C, discharge -30 C to +55 C and storage -20 C to +35 C. The governing warranty is narrower: operation -20 C to +55 C and storage 0 C to +35 C, plus approved cabinets for outdoor installation and the coastal-site exclusion. The IP65 enclosure rating and technical cold-operation claims do not waive these warranty conditions.
• The datasheet describes RS485/CAN/USB-C communication and remote maintenance/OTA conditional on a BIWATT inverter. Its UL/CE/RCM entries are manufacturer statements, not an independently recovered exact certificate or jurisdictional approval. Cell chemistry and no-cobalt marketing do not establish a quantified fire-safety result, lifecycle footprint or recycling arrangement.
• Technical documents were reviewed on 6 October 2026, with the current R5-family policy reused from the complete same-day governing-warranty review. Continuous battery power and governing hardware terms are now documented. Usable capacity, cycle retention and round-trip efficiency remain held; announcement/delivery status and local stock/approval are not refreshed. Identity fields and the evidence-only publication 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-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.

• BIWATT public document catalogue: R5_EN datasheet and product warrantyhttps://www.biwattpower.com/document

  R5_EN entry created 18 June 2026. Catalogue creation is not an instrument revision. Public document resolvers supply current maker PDF bodies without private warranty/serial queries.

• BIWATT R5 datasheet public download resolver, document 80https://www.biwattpower.com/gateway/front/website/document/80?lang=en

  Both image-only pages read. PNR-4.5-40, 4.5 kWh listed capacity, 3 kW battery continuous power and optional 6 kW inverter, conditional 8,000-cycle statement. Usable energy and cycle retention endpoint not established.

• BIWATT current R5-family product warranty public download resolver, document 31https://www.biwattpower.com/gateway/front/website/document/31?lang=en

  Complete same-day policy review reused; Table 1 names R5 with five-year hardware coverage. Current footer 10 August 2026 differs from catalogue 2 August 2025; environmental/site/claim/cost/remedy limits preserved. Not a cycle or capacity warranty.