TE 1971862-2 Solarlok PV4-B Obsolete: 2026 Alternatives

A 1971862-2 RFQ is a 2026 problem, not a 2021 problem

A North American EPC's procurement desk opens an old bill of materials for a 3.2 MW fixed-tilt ground-mount array originally quoted in 2021. The combiner-box interconnect drawing lists TE Solarlok PV4-B female coupler, P/N 1971862-2, 10–12 AWG, Plus-coded. The buyer calls the franchised line and learns the part has been on obsolete status for several years — no factory stock, no factory allocation, no scheduled last-time-buy. The same buyer pulls a competitive bid from a Texas integrator on a different project and sees the same P/N, requested again, this time with a print date of January 2026 stamped on the BOM. The two RFQs are unrelated. The connector is.

This is the 2026 photovoltaic connector problem in one line: legacy Solarlok PV4-B coupler 1971862-2 keeps reappearing in BOMs because the part was the default field-terminated DC connector for ten thousand US rooftops and hundreds of utility-scale arrays, and those arrays are still being serviced, re-roofed, expanded, or re-quoted — but the part itself is no longer in the franchised pipeline. The independent channel is where the demand lands.

This article is written for the buyer sitting in front of that RFQ. It walks through what 1971862-2 actually was, why it went obsolete, what the 2026 PV connector market looks like (Stäubli expansion in India, silver-price pressure on contact plating, interconnection queues pushing utility-scale delays, and rooftop solar restarting in Europe), and which catalog parts an independent connector and interconnect distributor can actually ship against today. Three TE catalog SKUs anchor the discussion: the obsolete 1971862-2, the active Solarlok PV4-S male coupler 2-2270024-1 (10–12 AWG, Minus keyed), and the active Solarlok male coupler 7-1394461-1 (12 AWG, Minus keyed, box package). All three carry field-terminated, weather-sealed, polarity-enforced construction typical of the Solarlok platform.

What 1971862-2 was, and why it went obsolete

The TE Connectivity 1971862-2 is a Solarlok PV4-B series female coupler. Its catalog specifications are narrow on purpose: Type Female Coupler, Series Solarlok PV4-B, 10 to 12 AWG wire range, Plus-coded keying, packaged in a bag, originally intended for solar photovoltaic junction-box and panel interconnect applications. The construction is a field-mateable, tool-less connector intended for rooftop and utility-scale arrays where a reliable, weatherproof DC power connection is needed.

The 10 to 12 AWG range covers the standard PV cable sizes used for string-level DC trunk lines. The Plus coding is the mechanical polarization feature — the female coupler only mates with a matching Plus-coded male half. A Solarlok PV4-B male plug with the same keying locks in with an audible click and seals the junction against weather. That polarization matters: in a PV string, reverse polarity at the panel junction is one of the failure modes that fails inverters, and the keying is the cheap way to keep it from happening in the field.

What changed is not the connector's design, but TE's portfolio strategy. The Solarlok family has been evolving toward field-installable splice variants (PV4-S) and insulation-displacement variants, while the older PV4-B female coupler on 1971862-2 has not been actively promoted for new designs for several years. The result is the catalog status you see today: 1971862-2 sits at Obsolete, while the male counterparts in the same ecosystem — 7-1394461-1 and 2-2270024-1 — remain Active. A buyer with a 1971862-2 line item has three honest options: redesign the wiring to use an active Solarlok variant, source the obsolete part through the independent channel with the appropriate lot-code and date-code scrutiny, or specify a Stäubli-compatible MC4 family product if the array is being re-quoted anyway.

Why 2026 is different from 2022

Three independent 2026 market signals are converging on the photovoltaic connector category at the same time. None of them is a single-vendor story.

First, the supplier base is consolidating around Stäubli as the de facto standard for field-installable DC connectors. On 29 January 2026, Stäubli announced a USD 10 million investment to expand its Bangalore manufacturing facility for solar PV connector production, with coverage from pv magazine Global, SolarQuarter, Saur Energy, Energetica India, and TaiyangNews all running the same week. The Bangalore expansion adds capacity for the original Multi-Contact / MC4 family product that Stäubli inherited when it acquired Multi-Contact in 2002 and which still carries the MC4 mechanical envelope (4 mm contact, snap-lock latch, IP67 mated) used by hundreds of panel and inverter OEMs. A 12 November 2025 Solar Builder piece on the Stäubli + Create Energy collaboration to build a PV connector rated for tracker stress is the second supplier-base signal: Stäubli is pushing the MC4 envelope into mechanically harsher applications. A 18 August 2026 openPR release on Slocable's KUIQX crimp-free PV connector debut at Intersolar Mexico 2026 shows the alternative-supplier track is also alive — third-party MC4-compatible manufacturers are still entering the market.

Second, silver and copper pressure is showing up in PV contact pricing. A 18 February 2026 Business Today piece documented how record silver and copper prices were pressuring solar PV manufacturers; a 20 August 2026 FXEmpire outlook on silver noted that a tenth of the silver in electronics is heading to one buyer (the silver in PV front-side paste and in connector contacts is a smaller but visible fraction); a 18 April 2026 Discovery Alert report on the silver market deficit intensifying as supply crisis threatens industry is the macro context. For a connector buyer this matters because the silver-plated copper contact inside a Solarlok or MC4 coupler is the second-most-expensive line item after the housing. When silver squeezes, contact pricing follows.

Third, the demand side is split between utility-scale interconnection delay and a residential rooftop rebound. A 12 July 2026 Energy MarketScale report put the energy-transition market at USD 3.17 trillion in 2026 with grid-connection backlogs stalling 1,650 GW of capacity. A 10 July 2026 pv magazine USA piece covered grid operators making interconnection progress while solar and storage still face long waits. On the rooftop side, a 23 April 2026 Reuters piece documented the Iran war reviving European rooftop solar demand to cut energy bills; a 20 July 2026 Fortune Business Insights rooftop solar installation market forecast to 2034 is the size number; a 4 June 2026 PR Newswire release announced PG&E surpassing 1 million customer solar interconnections — most of any US utility. Behind the meter is where the small-connector volume is now.

The interaction between these three signals is what makes 2026 different. A buyer who asks for a 1971862-2 today is asking in a market where the dominant supplier (Stäubli) is investing in capacity, the contact metal is under cost pressure, and the demand is split between stalled utility-scale interconnection queues (where independent distributors are filling the gap) and a behind-the-meter rooftop rebound (where MOQ flexibility and short lead times matter more than catalogue compliance).

What the catalog can ship against right now

Three TE Solarlok SKUs in the current catalog anchor the discussion for a buyer who wants to stay inside the Solarlok family but move off the obsolete part.

The TE 7-1394461-1 is a Solarlok Male Coupler, Minus keyed, designed for field-terminated solar panel string interconnects. It accepts 12 AWG cable, matching the common conductor size for PV array wiring between panels and combiner boxes. The Minus keying is a mechanical polarization feature that ensures the male coupler only mates with a Minus-coded receptacle — in a PV string, this prevents reverse-polarity connection at the panel junction. The keying is moulded into the housing and is not a removable insert, so field swapping is not possible. For a harness builder, the 12 AWG wire acceptance is the defining fit parameter: the crimp barrel and seal are sized for that gauge, and the connector will not accept 10 AWG or 14 AWG without a terminal change. If the legacy 1971862-2 BOM line was specified at 10 AWG, this is not a drop-in — it is a redesign.

The TE 2-2270024-1 is a Solarlok PV4-S Male Coupler, Minus keyed, with a wider 10 to 12 AWG cable acceptance. The PV4-S series is the field-installable splice generation of Solarlok — the male half of an in-line splice that terminates the cable end and locks into the female housing with an audible click, sealing the junction against weather. The Minus keying mates with the corresponding Plus-keyed receptacle to enforce correct polarity in the PV array. For a buyer replacing a 1971862-2 in a string-junction application where 10 AWG is the cable size, this is the closer active match than 7-1394461-1, because the 10 AWG cable barrel is part of the design.

The TE 1971862-2 itself remains in the catalog at Obsolete status. Independent distributors can still source it from factory-overrun, authorized excess, and franchised-channel de-stock, but the supply is finite and the lot-code / date-code discipline matters more than for an active part. For a buyer whose BOM has 1971862-2 printed on it, the honest answer from an independent-channel desk is: yes, we can ship against that P/N, in the quantity the BOM needs, with a documented lot history and a date code that is acceptable to the AHJ — but the supply tail is what it is, and a redesign to 2-2270024-1 or to an MC4-compatible third-party connector is the durable fix.

Cross-reference and the intermatability question

A common 2026 RFQ error is to assume that any field-installable PV connector with the same cable range and IP rating will mate with the legacy Solarlok PV4-B. It will not, and that is by design.

A 4 April 2022 Solar Builder piece titled "Cross-mating solar PV connectors? Know that testing is not certification" is the clearest industry-side statement of why: the MC4 envelope, the Solarlok PV4 envelope, and the third-party MC4-compatible envelopes are mechanically similar but not certified intermateable. The plus/minus keying on Solarlok PV4-B and the polarity rib on Stäubli MC4 are independent polarization systems, so a Solarlok PV4-B Plus-coded receptacle and an MC4 Plus-coded receptacle look similar from the outside but will not lock together inside the housing. UL 6703 covers the connector as a mated pair, not as a half.

For a buyer considering a third-party MC4-compatible alternative on a re-quoted job, the practical rule is to specify the connector as a pair from the same product family and to verify UL 6703 listing on the mated pair, not on the half-connector. Mixing a Solarlok PV4-B female with an MC4 male on the same string is not a 2026 best practice and will fail a quality-gate review.

Independent-channel sourcing reality in 2026

For a 1971862-2 RFQ, an EPC's procurement options narrow to three.

The first is a redesign to an active Solarlok variant. The 2-2270024-1 PV4-S male coupler (10 to 12 AWG, Minus keyed) is the closest functional match for a 10 AWG BOM, and 7-1394461-1 (12 AWG, Minus keyed) is the closest match for a 12 AWG BOM. The redesign path is cleanest for new builds and for warranty-covered replacements where the AHJ accepts an equivalent. It is not clean for in-service arrays with a 1971862-2 combiner box print, because mixing an obsolete PV4-B female with a new PV4-S male on the same string breaks the polarization keying contract.

The second is independent-channel sourcing of the obsolete part. As an independent connector and interconnect distributor, the catalog carries 1971862-2 with documented lot and date codes, ships against MOQ as low as a single bag for emergency maintenance calls, and can support larger runs where the supply tail allows. The boundary is the standard independent-channel one: lot-code and date-code documentation, no factory warranty on the obsolete P/N, and a clear note in the RFQ response that the supply tail is finite. Counterfeit risk on field-installable PV connectors is real — the 8 September 2025 pv magazine Global analysis of 6,276 connectors for rooftop PV systems is the most recent cross-section — and the way to manage it is the same as for any obsolete electronic component: traceable supply chain, vendor reputation, and physical inspection on receipt.

The third is the Stäubli-compatible MC4 path. If the array is being re-quoted anyway, the labor cost of switching to MC4 is small relative to the supply-tail benefit, and the Stäubli Bangalore expansion announced in January 2026 is the supplier-side signal that capacity is being added specifically for this product family. The trade-off is connector-pair consistency: a 1971862-2 array that has been operating reliably for ten years should not have one combiner box retrofitted with MC4 unless the AHJ and the inverter OEM both sign off on the cross-reference. For a brand-new array or a full-string replacement, MC4 is the easier RFQ to defend.

What an RFQ response should look like

A clean 2026 RFQ response on a 1971862-2 line item includes three sections.

The first is the specification match: P/N, description, cable range, keying, packaging, and the date-code window the buyer is willing to accept. For 1971862-2 that is a Solarlok PV4-B female coupler, 10 to 12 AWG, Plus-coded, bag package, with a date code recent enough to satisfy the AHJ's storage-life expectations. The second is the lead-time and MOQ statement. Independent-channel MOQ on an obsolete part is typically one bag for maintenance calls and 25 to 100 pieces for a small string replacement, with lead times measured in weeks rather than the 22 to 26 weeks a franchised line might quote on a current-production connector. The third is the alternative-quote section. A serious response names 2-2270024-1 as the active Solarlok match, 7-1394461-1 as the 12 AWG-only variant, and a third-party MC4 alternative for re-quote scenarios — with the cross-reference note that mixing Solarlok and MC4 halves on the same string is not supported.

What this catalog does and does not do

For a buyer who needs a Solarlok PV4-B female coupler today, the catalog carries the obsolete 1971862-2 with documented lot history, ships against a maintenance MOQ, and supports string-replacement runs where the supply tail allows. For a buyer who is willing to redesign to the active Solarlok generation, the catalog carries the PV4-S male coupler 2-2270024-1 (10 to 12 AWG, Minus keyed) and the Solarlok male coupler 7-1394461-1 (12 AWG, Minus keyed). The catalog does not carry a franchised Stäubli MC4 line — that is a separate, authorized-channel procurement — and it does not warrant an obsolete part against factory quality standards. The boundary on PPAP, IMDS, and franchised-only certifications is respected: the independent channel can ship against an RFQ, but the documentation set is what an independent channel can produce, not what a franchised line produces.

A note on the silver and copper context

The silver and copper pressure documented in early 2026 is not a 1971862-2-specific issue. It is a contact-pricing issue across the field-installable PV connector category, and it is the macro reason a 2026 RFQ on an active Stäubli MC4 or active Solarlok PV4-S coupler is likely to come back at a higher price than the same RFQ would have returned in 2023. For an EPC with a fixed-price PPA, the practical implication is that connector cost should be re-quoted annually, not held at the price the PPA was signed at. For a rooftop installer with shorter contract cycles, the implication is that the connector line item on a residential quote should be hedged against the silver spot price, not pegged to a multi-year catalog.

A note on the utility-scale interconnection queue

The 12 July 2026 Energy MarketScale figure of 1,650 GW of capacity stalled in grid-connection backlogs, and the 10 July 2026 pv magazine USA piece on grid operators making interconnection progress, together describe a utility-scale PV market where the connector is the easy part and the queue is the constraint. For an EPC with a project that has cleared interconnection and is in procurement, the connector RFQ is the simple line item. For an EPC with a project still in the queue, the connector RFQ is a planning exercise — buy later, but design the BOM with the active Solarlok generation so the late-stage procurement is not held up by a 1971862-2 redesign under a milestone pressure.

What to do next

For a 1971862-2 RFQ sitting on a buyer's desk right now: confirm whether the AHJ and the inverter OEM will accept an obsolete P/N with documented lot history, then send the P/N, the cable range, the keying, and the quantity to the independent-channel desk. For a new array or a full-string replacement: redesign the BOM to the active Solarlok PV4-S generation or to the Stäubli MC4 family, and source the connectors against the same authorized-and-independent split that an active P/N would use. For a buyer who wants to understand the 2026 market context: the Stäubli Bangalore expansion, the silver and copper pressure, and the rooftop-vs-utility-scale demand split are the three signals to watch. None of them is going to make a 1971862-2 RFQ easier, but they explain why the RFQ is showing up at all.