Solar modules, inverters, and trackers.

MW-block trading: project-surplus pallet stacks, repower removals, and OEM excess inventory in lot sizes from roughly 500 kW to 50 MW. Refound is not for residential or single-pallet C&I trades — those markets are well-served elsewhere. The cutoff is whatever a procurement engineer treats as a coherent project line item.

Flash test should be per-pallet at minimum, with mean degradation reported against nameplate Pmax. Modules pulled from operating projects typically run 2-7% degradation depending on age and climate. Watch for outlier modules within a pallet — high standard deviation across a single pallet often signals a lightning strike, transport damage, or a manufacturing-batch issue worth pricing in.

Potential-induced degradation can knock 10-30% off nameplate output if modules sat for years in a high-voltage string with grounding asymmetry. Flash test alone won't always catch it. Ask for IEC 62804 PID-resistance certification on the original module, plus a recovered-from-PID test if the modules came off a known-issue project. Reputable repower contractors will have this data.

Modern central inverters carry 20-25 year design lives and the major capital cost is the cabinet plus IGBTs. A 1-MW central with 8-10 years of service and a documented IGBT replacement is often a strong value buy at 30-50% of new cost. Avoid units with fluid-cooled designs that have leaked, and confirm the controller firmware can be updated to current grid-support requirements (UL 1741-SB for post-2022 interconnections).

Roughly 1.6 MW of standard 550W modules fits on 18 standard truckloads (≈ 90 pallets). Refound's freight quotes account for tracker-paired bifacial weights and the per-pallet handling for partial loads. For deliveries inside 500 mi of supply, FOB origin with the buyer's freight broker is typically cheapest; longer distances often favor seller-arranged dedicated freight.

OEM model number and revision, install date, soils/wind data from the original project (tracker bearings are sized to site-specific wind class), torque-tube length and section count, and any service history on motor units or controllers. For Nextracker and Array Technologies systems, also confirm the firmware is upgradeable to current self-powered or NX Horizon control schemes.