The assessment
How it scores, by category
Market position
The data
DC-coupled battery
Stores DC energy and relies on system power electronics outside the battery product for household AC.
- Product role
- The published battery record covers the storage stack, controller and stated capacity range.
- Published range
- 4.992–29.952 kWh
- Phase
- Not recorded
- Backup boundary
- Installation-specific
What the documents establish
Published evidence, source-reviewed non-disclosure and unresolved questions remain separate from the product score.
Usable capacity
Stated depth of discharge: 97.5%. Published usable energy: 4.992 kWh in the scored configuration. These values may have different measurement conditions.4.992 kWh usableScored configuration: BTS 5K. Published range 4.992–29.952 kWh.
The stated depth of discharge and published usable energy can have different test conditions or configuration limits. They do not by themselves establish nominal capacity or a reserve that is always inaccessible. Delivered AC energy and runtime also depend on the inverter, settings and loads.
The current datasheet range uses one to six 4.992 kWh usable modules. The score remains anchored to one module; the Australian warranty uses a lower 4.60 kWh contractual usable-energy baseline.
Usable capacity sourceDepth-of-discharge sourceCapacity guarantee: minimum retained at year 10
No year-by-year capacity schedule is published for this product - the manufacturer guarantees only this end-of-term minimum, not a specific decline curve. Capacity figure based on the sourced usable capacity of the base configuration; modular systems scale with additional modules.
Blackout protection
47 / 100#75 of 90 batteriesPartial (essential loads)
The blackout score is a standalone benchmark of outage resilience only - it re-weights sourced specs already scored in this product’s pillars (backup tier, switchover, surge strength, backup power, off-grid recharge) and never affects the overall score. Dots show the full battery fleet; the marker is this product.
Verification & sources
Market context
Global evidencechange in the site menu
Global benchmark. This scorecard is benchmarked globally. A global score does not imply local availability, certification, warranty coverage, or installer compatibility.
Benchmark anchor. The current datasheet range uses one to six 4.992 kWh usable modules. The score remains anchored to one module; the Australian warranty uses a lower 4.60 kWh contractual usable-energy baseline. Scored model: BTS 5K · checked 2026-07-27. Evidence.
Sources & references · checked 2026-09-22
Strong evidence coverage
29 of 29 scored criteria link directly to a published source.
Values marked estimated, derived, or not found remain visible on the audit sheet and do not carry the same evidential weight as a linked source. Coverage measures direct links, not an independent guarantee that a claim is correct.
How far the evidence reaches
- OutputManufacturer claim2 rows in the rings4 design facts beside the rings
- EnduranceReviewed absence only1 row in the rings4 warranty terms and 1 design fact beside the rings
- SafetyCertified or regulator-listed1 of 4 rows in the rings beyond claim2 design facts beside the rings
- BackingManufacturer claim2 rows in the rings1 warranty term beside the rings
- FitManufacturer claim5 rows in the rings3 design facts beside the rings
- FootprintNot assessed for batteries
Rings, outside in: manufacturer claim, certified or regulator-listed, third-party source. The centre is review.solar's own measurement, empty for every product today. Warranty terms and design facts that rest on the maker's own word are counted beside the rings; a reviewed absence, or one that reaches beyond the maker's claim, stays in them. How the evidence puzzle works
Record revision. BTS 5K datasheet V2.1 dated 2026-01-06, ESI 3-6K-S1 datasheet and Australian battery warranty Rev 1.1 re-audited 2026-08-06. First-market US and DE overlay review 2026-08-30: official regional catalogues recorded; Australian overlays and scores unchanged. Bounded 2026-10-05 review of Australian ESI S1 Issue 01 manual (12 March 2026; catalogue V4.6): BTS 5K BMS update disclosure integrated and inverter surge-duration conflict retained. Other verification dates unchanged.
- Sourced valuesData card →
- Warranty summary10-year product warranty →
Show 3 more
- Modularity & scalabilityManufacturer ↗
- Safety certificationManufacturer ↗
- Financial strength & warranty backingManufacturer ↗
Help strengthen this record
These are published evidence gaps, not private submissions. A source is reviewed under the same methodology whether it comes from a reader, installer or manufacturer.
- Verified reliabilityNot stated in reviewed documentsThe public documents reviewed for this record do not state this value. A published or independent source is requested.Offer a source
- Cell provenance & traceabilityNot stated in reviewed documentsThe public documents reviewed for this record do not state this value. A published or independent source is requested.Offer a source
- VPP & grid services readinessNot stated in reviewed documentsThe public documents reviewed for this record do not state this value. A published or independent source is requested.Offer a source
- EV charging integrationNot stated in reviewed documentsThe public documents reviewed for this record do not state this value. A published or independent source is requested.Offer a source
Product record history
1 change to this record · 1 product changed in this update
Safety certification: Evidence sources
- Before
- https://www.sofarsolar.com/product/residentialstorage/battery/BTS%205K.html; https://www.sofarsolar.com/upload/file/20240205/1707130552887057761.pdf
- After
- https://cer.gov.au/document/cec-approved-solar-batteries-0; https://www.sofarsolar.com/product/residentialstorage/battery/BTS%205K.html; https://www.sofarsolar.com/upload/file/20240205/1707130552887057761.pdf
1 change to this record · 22 products changed in this update
Cell provenance & traceability: Evidence sources
- Before
- https://www.sofarsolar.com/upload/file/20260107/1767754640090029347.pdf
- After
- https://www.sofarsolar.com/upload/file/20240205/1707130544677033391.pdf; https://www.sofarsolar.com/upload/file/20260107/1767754640090029347.pdf
14 changes to this record · 10 products changed in this update
AU Certifications
- Before
- SOFAR's exact PowerAll system documentation lists IEC 62619 and UN 38.3 for the BTS 5K battery, alongside inverter safety and Australian grid standards.
- After
- A TÜV Rheinland LGA Products certificate of conformity (No. AK 50596858 0001, 14 August 2023) names BTS 5K against IEC 62619:2017 and EN 62619:2017 for engineering samples and states that it does not assess production. A DEKRA CB test certificate (NL-89778, 17 July 2023) names BTS 5K against IEC 62040-1:2017 with Amendment 1:2021 and lists Australian and EU group differences. Inverter safety and Australian grid standards belong to the ESI inverter.
Modularity & scalability: Evidence sources
- Before
- https://au.sofarsolar.com/product/residentialstorage/storageinverter/ESI%203-6K-S1.html; https://www.sofarsolar.com/product/residentialstorage/battery/BTS%205K.html
- After
- https://au.sofarsolar.com/product/residentialstorage/storageinverter/ESI%203-6K-S1.html; https://www.sofarsolar.com/product/residentialstorage/battery/BTS%205K.html; https://www.sofarsolar.com/upload/file/20260113/1768292902258003823.pdf
DE Support Note
- Current text
- The dedicated German BTS 5K product URL returned HTTP 500 again on 7 October 2026, and the German battery catalogue lists only BTS E5-E20-DS5. The German download list shows a BTS E5-E20-DS5 datasheet (2 August 2023) and manual (14 December 2022) but no BTS 5K datasheet, and the German ESI 3-6K-S1 page names no battery model or capacity. A SOFARSOLAR battery warranty for Germany, Austria and Switzerland (Rev A2, SF-WI-GS-002, version 1.2 updated 15 December 2025) names BTS 5K and states 10 years or 10.5 MWh with 80% of a 4.60 kWh usable-energy reference, whichever occurs first. A warranty naming the model does not establish that it is offered for sale in Germany. This overlay does not create a pairing recommendation. Status stays not_reviewed because neither unavailable nor available is confirmed.
The previous text is not reproduced here: both versions run to a full research paragraph. Both are in the JSON record linked below.
DE market evidencePrimary datasheet+3 in JSON recordAU Support Note
- Current text
- Battery communication is local CAN, but no public battery API or offline operating guarantee is published. AC transfer, surge and phase behavior live in the external inverter rather than BTS 5K. The exact Australian ESI S1 manual documents a BMS/PCU software-update menu; firmware security architecture and support lifetime remain unestablished. Inverter surge duration is unresolved: the international V2.4 sheet states 60 seconds, while the Australian Issue 01 manual states 10 seconds at the same 150% peak apparent powers. Confirm the installed inverter revision and applicable rating before relying on surge performance. Australian-market documents also disagree: the Australian PowerAll system datasheet V2.0 (13 January 2026) lists 60 seconds for the ESI 5K-S1-A and ESI 6K-S1 modules, while the Australian ESI 3-6K-S1 datasheet V2.2.0 (5 December 2025) lists 10 seconds. The Australian service contact in the Rev 1.2 battery warranty is Sofarsolar Ausco Pty Ltd, Sydney, service@sofarsolar.com.au.
The previous text is not reproduced here: both versions run to a full research paragraph. Both are in the JSON record linked below.
Safety certificationAU market evidence+8 in JSON recordWarranty period (yrs): Evidence sources
- Before
- https://www.sofarsolar.com/product/residentialstorage/battery/BTS%205K.html; https://www.sofarsolar.com/upload/file/20241030/1730269417969037331.pdf
- After
- https://www.sofarsolar.com/product/residentialstorage/battery/BTS%205K.html; https://www.sofarsolar.com/upload/file/20260724/1784860707161030890.pdf
Warranty assurance: Evidence sources
- Before
- https://www.sofarsolar.com/upload/file/20241030/1730269417969037331.pdf
- After
- https://www.sofarsolar.com/upload/file/20260724/1784860707161030890.pdf
AU Warranty scope
- Current text
- SOFAR's Australian battery warranty (Rev 1.2, SF-WI-GS-014, version 1.2 updated 15 December 2025) names BTS 5K and provides 10 years or 18.25 MWh with 70% retained usable energy, whichever occurs first (clause 3). Its table uses a 4.992 kWh usable-energy reference for BTS 5K, which matches the January 2026 datasheet. The earlier Rev 1.1 used a 4.60 kWh reference.
The previous text is not reproduced here: both versions run to a full research paragraph. Both are in the JSON record linked below.
Safety certificationAU market evidence+8 in JSON recordDE Evidence sources
- Before
- https://de.sofarsolar.com/product/residentialstorage/battery/BTS%205K.html; https://de.sofarsolar.com/product/residentialstorage/storageinverter/ESI%203-6K-S1.html; https://www.sofarsolar.com/product/residentialstorage/battery/BTS%205K.html
- After
- https://de.sofarsolar.com/product/residentialstorage/battery/BTS%205K.html; https://de.sofarsolar.com/product/residentialstorage/battery/list_1.html; https://de.sofarsolar.com/product/residentialstorage/storageinverter/ESI%203-6K-S1.html; https://www.sofarsolar.com/product/residentialstorage/battery/BTS%205K.html; https://www.sofarsolar.com/upload/file/20260722/1784700667088076984.pdf
Safety certification: Evidence sources
- Before
- https://www.sofarsolar.com/product/residentialstorage/battery/BTS%205K.html; https://www.sofarsolar.com/upload/file/20240205/1707119098881072612.pdf
- After
- https://www.sofarsolar.com/product/residentialstorage/battery/BTS%205K.html; https://www.sofarsolar.com/upload/file/20240205/1707130552887057761.pdf
Warranty degradation guarantee: Evidence sources
- Before
- https://www.sofarsolar.com/product/residentialstorage/battery/BTS%205K.html; https://www.sofarsolar.com/upload/file/20241030/1730269417969037331.pdf
- After
- https://www.sofarsolar.com/product/residentialstorage/battery/BTS%205K.html; https://www.sofarsolar.com/upload/file/20260724/1784860707161030890.pdf
AU Evidence sources
- Before
- https://www.sofarsolar.com/product/residentialstorage/battery/BTS%205K.html; https://www.sofarsolar.com/upload/file/20241030/1730269417969037331.pdf; https://www.sofarsolar.com/upload/file/20260107/1767754640090029347.pdf; https://www.sofarsolar.com/upload/file/20260128/1769582404044005609.pdf; https://www.sofarsolar.com/upload/file/20260316/1773653907482011378.pdf
- After
- https://www.sofarsolar.com/product/residentialstorage/battery/BTS%205K.html; https://www.sofarsolar.com/upload/file/20240205/1707130544677033391.pdf; https://www.sofarsolar.com/upload/file/20240205/1707130552887057761.pdf; https://www.sofarsolar.com/upload/file/20241030/1730269417969037331.pdf; https://www.sofarsolar.com/upload/file/20251216/1765872816646069574.pdf; https://www.sofarsolar.com/upload/file/20260107/1767754640090029347.pdf; https://www.sofarsolar.com/upload/file/20260113/1768292902258003823.pdf; https://www.sofarsolar.com/upload/file/20260128/1769582404044005609.pdf; https://www.sofarsolar.com/upload/file/20260316/1773653907482011378.pdf; https://www.sofarsolar.com/upload/file/20260724/1784860707161030890.pdf
End-of-warranty retained capacity (%): Evidence sources
- Before
- https://www.sofarsolar.com/product/residentialstorage/battery/BTS%205K.html; https://www.sofarsolar.com/upload/file/20241030/1730269417969037331.pdf
- After
- https://www.sofarsolar.com/product/residentialstorage/battery/BTS%205K.html; https://www.sofarsolar.com/upload/file/20260724/1784860707161030890.pdf
Warranty throughput: Evidence sources
- Before
- https://www.sofarsolar.com/upload/file/20241030/1730269417969037331.pdf
- After
- https://www.sofarsolar.com/upload/file/20260724/1784860707161030890.pdf
AU Warranty conditions
- Current text
- labour: Installer labour and travel are not promised.; registration: Installation and operating conditions apply.; remedy: SOFAR may at its sole discretion change configuration or update software, repair with spare parts, or replace with a new or refurbished product that is at least functionally equivalent, or an upgraded model (clause 4, Rev 1.2). Rev 1.1 also stated refund formulas, which Rev 1.2 does not state.; removal reinstallation: Removal and reinstallation are not promised; unapproved relocation is excluded.; transferability: No subsequent-owner transfer right was found in the governing terms.; transport: Unconditional claim freight is not promised.
The previous text is not reproduced here: both versions run to a full research paragraph. Both are in the JSON record linked below.
Safety certificationAU market evidence+8 in JSON record
8 changes to this record · 1 product changed in this update
Firmware & security disclosure
- Before
- No security or firmware documentation found
- After
- Firmware updates referenced; no security documentation
AU Support Note
- Before
- Battery communication is local CAN, but no public battery API or offline operating guarantee is published. AC transfer, surge and phase behavior live in the external inverter rather than BTS 5K.
- After
- Battery communication is local CAN, but no public battery API or offline operating guarantee is published. AC transfer, surge and phase behavior live in the external inverter rather than BTS 5K. The exact Australian ESI S1 manual documents a BMS/PCU software-update menu; firmware security architecture and support lifetime remain unestablished. Inverter surge duration is unresolved: the international V2.4 sheet states 60 seconds, while the Australian Issue 01 manual states 10 seconds at the same 150% peak apparent powers. Confirm the installed inverter revision and applicable rating before relying on surge performance.
Source revision
- Current text
- BTS 5K datasheet V2.1 dated 2026-01-06, ESI 3-6K-S1 datasheet and Australian battery warranty Rev 1.1 re-audited 2026-08-06. First-market US and DE overlay review 2026-08-30: official regional catalogues recorded; Australian overlays and scores unchanged. Bounded 2026-10-05 review of Australian ESI S1 Issue 01 manual (12 March 2026; catalogue V4.6): BTS 5K BMS update disclosure integrated and inverter surge-duration conflict retained. Other verification dates unchanged.
The previous text is not reproduced here: both versions run to a full research paragraph. Both are in the JSON record linked below.
Primary datasheetAU Evidence sources
- Before
- https://www.sofarsolar.com/product/residentialstorage/battery/BTS%205K.html; https://www.sofarsolar.com/upload/file/20241030/1730269417969037331.pdf; https://www.sofarsolar.com/upload/file/20260107/1767754640090029347.pdf; https://www.sofarsolar.com/upload/file/20260128/1769582404044005609.pdf
- After
- https://www.sofarsolar.com/product/residentialstorage/battery/BTS%205K.html; https://www.sofarsolar.com/upload/file/20241030/1730269417969037331.pdf; https://www.sofarsolar.com/upload/file/20260107/1767754640090029347.pdf; https://www.sofarsolar.com/upload/file/20260128/1769582404044005609.pdf; https://www.sofarsolar.com/upload/file/20260316/1773653907482011378.pdf
Firmware & security disclosure: Evidence sources
- Before
- https://www.sofarsolar.com/product/residentialstorage/battery/BTS%205K.html
- After
- https://www.sofarsolar.com/upload/file/20260316/1773653907482011378.pdf
Firmware & security disclosure: Evidence status
- Before
- reviewed_absence
- After
- sourced
2 changes to this record · 49 products changed in this update
DE Support Note
- Current text
- The dedicated German BTS 5K product URL returns HTTP 500. German ESI 3-6K-S1 copy names PowerAll stack capacities, which is not an independent BTS 5K battery sale path. A Europe-outside-Germany battery warranty that names BTS 5K is not a German instrument. This overlay does not create a pairing recommendation. Re-audited 2026-09-22: this determination rests solely on the fetch failure recorded above, with no independently reachable regional catalogue, store or archived copy consulted. Downgraded to not_reviewed - unavailable was not confirmed, and this pass did not re-fetch to confirm available either.
The previous text is not reproduced here: both versions run to a full research paragraph. Both are in the JSON record linked below.
DE market evidencePrimary datasheet+1 in JSON record
9 changes to this record · 12 products changed in this update
US Status
- Before
- Not previously recorded
- After
- unavailable
DE Certifications
- Before
- Not previously recorded
- After
US Support Note
- Before
- Not previously recorded
- After
- SOFARSOLAR's contact region list names Germany/Austria/Switzerland, Australia, the UK and other territories. It does not name the United States. No official US host lists BTS 5K. us.sofarsolar.com does not resolve. HYD 5-20KTL-3PH is not this PowerAll identity.
US Certifications
- Before
- Not previously recorded
- After
DE Evidence sources
- Before
- Not previously recorded
- After
- https://de.sofarsolar.com/product/residentialstorage/battery/BTS%205K.html; https://de.sofarsolar.com/product/residentialstorage/storageinverter/ESI%203-6K-S1.html; https://www.sofarsolar.com/product/residentialstorage/battery/BTS%205K.html
US Evidence sources
- Before
- Not previously recorded
- After
- https://www.sofarsolar.com/contact.html; https://www.sofarsolar.com/product/residentialstorage/battery/BTS%205K.html; https://www.sofarsolar.com/product/residentialstorage/storageinverter/ESI%203-6K-S1.html
DE Status
- Before
- Not previously recorded
- After
- unavailable
Source revision
- Before
- BTS 5K datasheet V2.1 dated 2026-01-06, ESI 3-6K-S1 datasheet and Australian battery warranty Rev 1.1 re-audited 2026-08-06
- After
- BTS 5K datasheet V2.1 dated 2026-01-06, ESI 3-6K-S1 datasheet and Australian battery warranty Rev 1.1 re-audited 2026-08-06. First-market US and DE overlay review 2026-08-30: official regional catalogues recorded; Australian overlays and scores unchanged.
DE Support Note
- Before
- Not previously recorded
- After
- The dedicated German BTS 5K product URL returns HTTP 500. German ESI 3-6K-S1 copy names PowerAll stack capacities, which is not an independent BTS 5K battery sale path. A Europe-outside-Germany battery warranty that names BTS 5K is not a German instrument. This overlay does not create a pairing recommendation.
8 changes to this record · 78 products changed in this update
Confidence
- Before
- Not previously recorded
- After
- high
State
- Before
- Not previously recorded
- After
- reviewed_absence
Value
- Before
- Not previously recorded
- After
- The exact current datasheet, product page and governing Australian warranty do not publish a cycle-life test to a stated retained-capacity endpoint.
Value
- Before
- Not previously recorded
- After
- Reviewed 2026-08-25: no exact-product battery/DC round-trip efficiency with a complete measurement boundary was established in the reviewed primary source set. This is a scoped reviewed absence, not proof that the value has never been measured.
Evidence sources
- Before
- Not previously recorded
- After
- https://www.sofarsolar.com/product/residentialstorage/battery/BTS%205K.html; https://www.sofarsolar.com/upload/file/20241030/1730269417969037331.pdf; https://www.sofarsolar.com/upload/file/20260107/1767754640090029347.pdf
Evidence sources
- Before
- Not previously recorded
- After
- https://www.sofarsolar.com/product/residentialstorage/battery/BTS%205K.html
State
- Before
- Not previously recorded
- After
- reviewed_absence
Confidence
- Before
- Not previously recorded
- After
- high
This is review.solar's publication history. It does not claim the product changed on the recorded date, and it excludes compatibility, system pairing, installation suitability and relative leaderboard prose. Open the complete JSON record.
Evidence timeline
Recorded verification events for this scorecard. These are evidence checks, not historical score snapshots.
- AU market evidence checked
- Plain-language warranty summary checked
- Core scorecard evidence checked
- DE market evidence checked
- US market evidence checked
- Series benchmark evidence checked
Scored by Solar Analytica Research
Further reading from Findings
Stay across the benchmark.
New scorecards, score changes and market signals, published as they happen.
Our reading
PowerAll BTS 5K scores 62, placing 50 of 76 in the Performance & Value class against a class average of 63.6. Its strongest scoring dimension is capacity & usability (88), above the class average of 84. Energy Ecosystem scores 40, the lowest pillar for this product. The class average on energy ecosystem is 48. Key specifications: LFP, 2.5 kW continuous output.
Dietreich Farquharson · review.solar