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And more equipment at launch.
These tiles show a representative cross-section of what Refound carries. The full searchable catalog will list every spec variant, manufacturer, and form factor at launch.
Refound · Categories
BESS components, verified and ready to deploy.
Battery modules, racks, PCS (power conversion systems), EMS, fire suppression, and complete BESS containers. LFP and NMC chemistry. State-of-Health, cycle count, and thermal-runaway history attested on every 3rd Party Verified listing.
The BESS secondary market is early. Refound makes it spec-searchable and trustworthy.
Sub-categories
What you can buy on Refound
Battery modules
Individual cell-level modules. LFP (LiFePO₄) and NMC chemistry. Common cell configurations: 314 Ah · 280 Ah · 100 Ah cells. Major OEM modules: Powin · Hithium · CATL EnerC+ · AESC · Canadian Solar e-Storage.
Browse on marketplace →
Battery racks
Pre-assembled racks containing battery modules + BMS + cooling. Nameplate energy 0.5 MWh to 5 MWh per rack, 0.5 MW to 2.5 MW per rack continuous power.
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Power conversion systems (PCS)
Bidirectional inverters for utility-scale storage, 500 kW to 5 MW per unit, common AC voltages 480 V / 600 V / 3.3 kV output.
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Energy management systems (EMS)
Site-level EMS controllers, including SCADA integration, market-bid optimization layers, and Modbus / DNP3 communication. Common platforms: Powin Stack OS, AlsoEnergy Stem, Tesla Megapack EMS.
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Fire suppression & safety
Aerosol and clean-agent suppression systems certified for Li-ion installations. NFPA 855 and UL 9540A compliant.
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Containers & e-houses
Outdoor-rated BESS containers and e-house enclosures. Empty shells (for rebuild) and complete populated systems.
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Search by spec
Specifications buyers filter on
State-of-Health, cycle count, certifications, chemistry. All first-class search filters. The spec attributes that determine BESS resale value, made searchable.
| Filter | Range available |
|---|---|
| Chemistry | LFP · NMC · LTO · Sodium-ion |
| Nameplate energy | 100 kWh to 5 MWh per rack; 1 MWh to 20 MWh per container |
| Nameplate power | 100 kW to 5 MW |
| C-rate | 0.25C · 0.5C · 1C · 2C |
| Voltage range | 400 V to 1500 V DC |
| Form factor | Module · Rack · Cabinet · Container · E-house |
| Certifications | UL 9540 · UL 9540A · IEC 62933 · NFPA 855 · UN38.3 |
| Cycle count | Range slider; State-of-Health ≥ 80% required for Verified |
| State-of-Health | Range slider (post-Verified) |
| In-service date | Range; cycles-per-year metric available |
| BMS firmware | Current and supported versions only for Verified |
| Location | ZIP radius |
Why secondary market
Why buy used BESS
The BESS secondary market is younger than transformers. Most installed inventory hasn't reached end-of-PPA yet. But three supply channels are already producing inventory: canceled-project surplus (modules ordered for projects that didn't reach NTP due to financing, interconnection delays, or tariff changes. Especially post-2024 Section 201 module + cell tariffs), OEM excess inventory (Powin, Canadian Solar e-Storage, Hithium, AESC factory-overrun units; often "factory new" with original OEM warranty), and project rebalancing (sites that downsized mid-construction divesting unused inventory).
Refound is differentiated for BESS specifically because State-of-Health and cycle history matter more than visible condition: and we make those data points first-class search filters.
There's a sustainability angle that's particularly sharp here: cell manufacturing is the highest-emitting step in a battery's life cycle, and the lithium / cobalt / nickel content is actively constrained on global supply. Every BESS rack pulled from canceled-project surplus or factory excess is one less new module that has to be mined, refined, and shipped. Reuse and repurposing aren't a side-of-desk thing for storage. They're how the next decade of BESS build-out keeps pace with critical mineral availability.
Free guide
Refound buying guides
BESS buying guide
Interpreting State-of-Health metrics, evaluating cycle count vs. warranty residuals, what UL 9540A test results actually mean for fire risk, and the recall + chemistry red flags that should stop the deal.
Free to read online or save as a PDF for offline reference.
FAQs
BESS FAQs
How does Refound handle Li-ion shipping regulations? +
All BESS sellers attest to UN 3480 / UN 3481 compliance (49 CFR 173.185), including hazmat training, packaging, and damaged/defective/recalled (DDR) provisions. Inline freight quotes for BESS account for hazmat surcharges. Damaged or recalled units cannot ship under standard hazmat protocols and are flagged at listing.
What if the BESS modules are from a recalled product line? +
Active-recall product lines (LG RESU 10H, certain Samsung SDI residential, etc.) are flagged at listing creation and cannot earn the 3rd Party Verified badge. Some recalled inventory can still trade legitimately for non-installation purposes (e.g., R&D, non-residential industrial use); listings clearly disclose recall status.
What's the warranty position on used BESS? +
Mixed. Factory-new OEM excess units may carry transferable warranties (verify with OEM). Used units typically ship as-is or with seller-provided refurb warranty. Refound surfaces warranty status as a search filter.
Can buyers commission used BESS into a brand-new project? +
Subject to your interconnection agreement and AHJ acceptance. UL 9540 certifications transfer with the equipment but installation re-permitting per NFPA 855 is required. Refound's verification report is meant to support that re-permitting case but doesn't substitute for it.
BESS that's available now, not in 2027.
Verified condition. Documented State-of-Health. Direct from professional sellers. Refound cuts the secondary-market opacity.