Calle Larga PV Plant — Tracker Control Retrofit Brief

1Executive Summary

Calle Larga operates Alion Energy Storm Tracker (AST) single-axis trackers controlled by P4Q Electronics "Suntrack" electronics: 86 self-powered Tracker Control Units (TCU) — one per motor — coordinated by a single Network Control Unit (NCU) over a wireless Zigbee 2.4 GHz Modbus mesh. Each TCU is powered by its own dedicated 30 W auxiliary PV panel and LiFePO4 battery, so no power or communication cabling runs to the trackers.

The prospective vendor (Shanghai Solarsurges Technology Co., Ltd.) has stated that both the TCU and the NCU should be replaced. This brief confirms that position is technically forced: the Solarsurges field radio (Sub-1GHz / LoRa mesh) is not interoperable with the installed Zigbee network, so a partial or mixed fleet is not possible — the retrofit must swap the NCU and all 86 TCUs (plus the wind sensor unit) in one campaign.

Key compatibility picture: the self-powered architecture matches (no new field cabling); NCU supply voltage matches (220–230 VAC); PV modules are unaffected by a controller-only swap. The three items that decide feasibility are: (1) the replacement TCU's motor drive rating against the Alion 24 VDC slew-drive motors, (2) mating or re-terminating the motor connector present on all 86 motor pigtails (field-verified as WEIPU SP21 series 3-pin screw-coupling; P4Q drawings state Binder 99-5606-75-03), and (3) SCADA re-integration and Chilean RF homologation. Section 5 lists every point the vendor must confirm.

2Installed System

All values below are extracted from the original manufacturer documentation and as-built drawings held by iEnergia. Each claim carries its source document and page.

2.1 TCU — P4Q Suntrack "Self-Powered" tracker controller (×86)

Identification & enclosure
Manufacturer / model	P4Q Electronics (Suntrack), Self-Powered controller, Zigbee variant DS p.1,14
Enclosure	Extruded aluminum 6060 + ASA covers; membrane keypad; external emergency stop; fuse holder; Gore-Tex vent DS p.2,5
Dimensions / weight	344 × 167 × 135 mm; 2.8 kg (3Ah) / 3.3 kg (6Ah) IM p.13–14
Mounting	4 holes 9.5 × 11.5 mm, screw spacing 317 × 129 mm, on bracket shared with aux PV panel IM p.21
Protection / environment	IP65 / NEMA 3S; −10…+60 °C; altitude < 3000 m DS p.7
Standards	CE; IEC 61000 EMC series; ASTM B117 (450 h salt mist); ETSI EN 300 328 (radio); IEC 62817 test reports on file DS p.11

Power input (self-powered)
Architecture	Dedicated auxiliary PV panel + LiFePO4 battery — no grid/AC connection at the tracker DS p.5,17
Aux PV panel	30 W / 36 V, monocrystalline, 645 × 345 × 25 mm, ≥ IP65, P/N ZPS2X36C001 ZPS dwg
Input voltage window	26–40 VDC typical (50 V / 1.5 A absolute max) DS p.8
Battery	LiFePO4 8-series, 25.6 V nominal, 3 Ah (8S1P) or 6 Ah (8S2P), CC-CV; fuse 10 A / 15 A. Installed size: TO BE CONFIRMED DS p.9–10
Motor output
Motor commanded	24 VDC brushed (Alion slew-drive motor) DS p.8
Max motor current	6 A (3Ah pack) / 12 A (6Ah pack); electronics flag overcurrent > 15.5 A; PCB rated 300 W continuous @ 24 VDC DS p.8,16
Duty limit	Max pulse 30 s at max motor current followed by 10 s rest (6Ah variant note) IM p.13

Circuit	Connector (exact P/N)	Cable	Source
MOTOR	Field-verified (13-Jul-2026): WEIPU SP21 series, 3-pin, screw-thread coupling, CE marked — contacts numbered 1/2/3 (see photos below). ⚠ P4Q documentation specifies Binder 99-5606-75-03 (3-pin bayonet) — the installed connector differs from the documented part. Pinout per documentation: Pin 1 → Motor − · Pin 2 → Motor + · Pin 3 → NC (pin count/numbering consistent with field unit; polarity to be re-verified on site). Motor-side terminations: insulated crimp receptacles 6.35 × 0.81 mm (2.5 mm²)	2 × 16 AWG, UL 2464, UV-protected, 1650 mm; cable gland M16×1.5 IP68	Field photo · C16003#38 · IM p.24
DC POWER + (from aux panel)	MC4-compatible female — non-standard part, Sungold Solar P/N FL02701	PV1-F 2.5 mm² 0.6/1 kV, ~500 mm; gland M12×1.5 IP68	C16003#01 · IM p.24
DC POWER −	MC4-compatible male	PV1-F 2.5 mm², ~450–500 mm	C16003#02
COMM (local service, RS-485)	Panel: WEIPU SP1312/S4C · aerial plug: WEIPU SP1310/P4 Type I. Pin 1 3V3 · Pin 2 RS485 power · Pin 3 RS485 − · Pin 4 RS485 +	service use only (USB-RS485 converter)	IM p.25
ZB (radio)	Zigbee antenna, 300 mm flying lead, hangs loose downward	—	IM p.24

Field photo: WEIPU SP21 series motor connector, side view — **Motor connector — field verification (13-Jul-2026), side view.** Body marked **WEIPU SP21 SERIES**, CE; screw-thread coupling ring. This is the connector actually installed on the TCU→motor circuit — it differs from the Binder part in the P4Q drawings. — *iEnergia site photo*

Field photo: WEIPU SP21 motor connector mating face, 3 contacts numbered 1-3 — **Motor connector — mating face.** 3 female contacts numbered 1 / 2 / 3 (consistent with documented pinout: 1 = Motor −, 2 = Motor +, 3 = NC). — *iEnergia site photo, 13-Jul-2026*

TCU end faces: MOTOR, EMERGENCY STOP, FUSE / COMM, POWER-, POWER+, VENT, ZB — **TCU connector faces (3Ah variant).** Left face: MOTOR, EMERGENCY STOP, FUSE. Right face: COMM, POWER−, POWER+, VENT, ZB antenna. — *P4Q Installation & Maintenance Manual D002-PS17026, p.23, Fig. 14*

Motor connector connection and connector reference list — **Motor & panel connector reference.** Bayonet-locking motor connector (Binder 99-5606-75-03) and MC4-compatible power pair. — *Installation Manual D002-PS17026, p.24, Figs. 16–17*

Motor cable drawing C16003#38 — **Motor cable assembly drawing.** Binder 99-5606-75-03 connector, 2×16 AWG UL2464 cable, 1650 mm, pin/color table (Red/1→M1, Black/2→M2). — *P4Q drawing ASSY-C16003#38 Rev A, sheet 1*

Power+ cable drawing C16003#01 — **Aux-panel power (+) cable drawing.** MC4-compatible female (non-standard, Sungold Solar FL02701), PV1-F 2.5 mm² 0.6/1 kV. — *P4Q drawing ASSY-C16003#01 Rev A, sheet 1*

2.2 Control & sensing (inside the TCU)

Microcontroller	Atmel ATxmega128A3U; USNO SPA solar-position algorithm, computational error < 0.015° DS p.12
Inclinometer	Internal, Kionix KX-023 3-axis, 0.2° accuracy @25 °C — no external position sensor on the tracker DS p.12
Tracking precision	0.1°; backtracking supported IM p.12
Firmware updates	Local, from SCADA/NCU, or from PC over the field network (remote-update tooling used on site) DS p.13

2.3 Field communications

Installed field network: Modbus over Zigbee 2.4 GHz (ETSI EN 300 328), 128-bit AES, 250 kbps, ~1200 m line-of-sight, mesh topology — every TCU can act as a router; the NCU is the network coordinator. DS p.11 · IM p.17
Any replacement using a different radio (e.g. Sub-1GHz / LoRa) cannot coexist with the installed fleet — mixed operation is not possible.

Zigbee mesh network diagram — **Installed Zigbee mesh topology.** NCU as coordinator, TCUs as routers. — *Installation Manual D002-PS17026, p.17, Fig. 8*

2.4 NCU — P4Q Suntrack Network Control Unit X12092#09 (×1, plant-wide)

Function	Gateway tracker network ↔ SCADA; centralizes positions/alarms; wind-alarm logic sends fleet to safe position; cleaning-position groups 1–8 via disconnect terminal block NCU p.3,10,24
Enclosure ("control box")	Safybox BRES-54 hot-pressed polyester, 500 × 400 × 200 mm, IP66 / IK10, RAL-7035, −30…+120 °C, door opens >180°; ~10.5 kg installed; wall/frame mounted outdoors, connectors at bottom via double-membrane seals + antenna bulkhead BRES cat. · NCU p.11,23
Power input	100–240 VAC nominal (90–264 VAC range), 50–60 Hz; < 0.80 A @115 V / < 0.60 A @230 V; plant feeds 230 VAC NCU p.10 · PLA-COM-01
Internal PSU	Delta DRC-24V30W1AZ: 24 VDC / 1.25 A / 30 W, DIN rail, Class II double-isolated Delta DS p.1–2
Protections	RCCB EPP DE F63 40 A / 30 mA + MCB C6 + 2× surge arresters EPP DE PS20 (Uc < 320 V, Imax 40 kA, IEC 61643-1); internal 320 V varistor Site photo · NCU p.10

CPU	CPU-Control Suntrack 32H; status LEDs (SW On / Comm / Alarm / Prog); internal RTC backup battery NCU p.25–27
Downstream (to TCUs)	Zigbee 2.4 GHz coordinator serving all 86 TCUs + wind sensor unit; gateway module Digi ConnectPort X2 (XBee→Ethernet); external 2.4 GHz antenna (ZANT24CWFIX) NCU p.13 · Digi DS
Upstream (to SCADA)	Ethernet — Modbus TCP to the plant monitoring system (GreenPowerMonitor) via fiber/switch in the inverter station; internal 5-port Ethernet switch (Sixnet SLX-5ES-1); fixed IP on plant LAN; published register map covering the 86 motor addresses PLA-COM-01 · map revD
Environment	−25…+65 °C operating NCU p.10
Standards	EMC 2004/108/CE — EN 61000-6-2/-6-4, EN 55011, EN 61000-4-x series; CE NCU p.29

Installed NCU cabinet interior at Calle Larga — **Installed NCU cabinet at Calle Larga (field photo, Apr 2019).** Top row: RCCB EPP DE F63 (40 A, 30 mA), MCB C6, 2× EPP DE PS20 surge arresters, Delta Chrome 24 V PSU. Below: CPU-Control Suntrack 32H with Ethernet port. — *iEnergia O&M photo archive*

NCU internal assembly drawing X12092#08 — **NCU internal assembly drawing.** Backplate layout: RCCB / MCB / surge arresters / PSU, Suntrack 32H CPU board, 5-port Ethernet switch, DIN terminal blocks, gateway. — *P4Q drawing ASSY-X12092 Rev A, sheet 1*

NCU enclosure bottom cable entries — **NCU cable entries.** Bottom-face membrane seals for power and communications cables. — *P4Q NCU technical data (NCU_Cable Access)*

Comms block diagram: tracker NCU to SCADA — **NCU integration into plant monitoring (as-built).** The tracker NCU connects over Ethernet to the plant switch and is polled by the GreenPowerMonitor SCADA. — *As-built drawing PLA-COM-01 "Diagrama en Bloques", sheet 1 (detail)*

2.5 Wind / weather sensing — Suntrack RSU

Unit	Suntrack RSU (Remote Sensor Unit), ASA enclosure 348 × 276 × 190 mm, IP67, −25…+70 °C RSU DS p.1–6
Power	90–264 VAC single-phase, 12.5 W typical (internal Delta 24 V/10 W PSU) RSU DS p.7
Sensors	Anemometer ANEMO4403 (+ snow sensor type 260-700 documented); up to 5 sensor inputs (RS-485 / analog / digital) RSU DS p.1,4
Comms	Zigbee to NCU (wireless variant installed); alarms trigger fleet safe-position RSU DS p.1

2.6 Plant-level layout & PV modules

Trackers	81 trackers: T00S–T49S (50, south field) + T13N–T44N excl. T27N (31, north field) PLA-T-01
Motors / TCUs	86 motors = 86 TCUs, monitoring IDs 1–86. Five trackers carry two motors each: T00S, T01S, T26N, T28N, T49S PLA-T-01 (Note 3)
Strings	353 strings of 29 modules (per combiner-box table CB01–CB18) ≈ 10,237 modules PLA-T-01 (derived)
Tables (mesas)	Tables of 5 or 6 modules (interior/exterior types per layout symbology) PLA-T-01
Tracker mechanics	Alion AST: ballasted single axis, rotation > ±60°, A-frame on concrete track, slew drive + geared table coupling, Storm-Lock (Geneva) stow lock; one drive can operate up to 120 modules Alion DS p.2
Module envelope (tracker)	Framed & frameless supported; string voltage ≤ 1500 V; module current ≤ 15 A Alion DS p.2

PV module	Longi LR6-72PD 350–370M, 72-cell mono PERC, double-glass bifacial. Exact wattage variant: TO BE CONFIRMED Longi DS
Dimensions / weight	1971 × 990 × 6 mm; 27.3 kg Longi DS
Electrical (360M @STC)	360 W; Voc 48.5 V; Isc 9.45 A; Vmp 39.9 V; Imp 9.02 A Longi DS
System ratings	Max system voltage DC 1500 V (IEC); series fuse 20 A; Class II Longi DS
Junction box / leads	IP67, 3 diodes; output cable 4 mm², 300 mm Longi DS
Relevance to retrofit	Controller-only swap — modules, clamps and purlins are untouched. Module data provided for electrical context (string-powered options, aux panel siting).

String distribution per combiner box — **String distribution (as-built).** CB01–CB18 with connected strings and tracker ranges. — *PLA-T-01 As Built, detail*

Tracker to motor ID mapping in monitoring system — **Tracker → motor ID map (monitoring system).** 86 motor IDs; dual-motor trackers appear as -1/-2. — *PLA-T-01 As Built, detail*

Tracker distribution layout, Calle Larga — **Tracker distribution — full as-built layout.** South field (T00S–T49S) and north field (T13N–T44N); motor positions marked; combiner boxes CB01–CB18; inverter station (CIT) at center. — *PLA-T-01 "Distribución de Trackers", As Built rev. Dec 2023*

3Proposed System — Solarsurges

Extracted from the Solarsurges Company Profile & Product Brochure (EN, 12 pages, doc. dated 2026-07-06). The brochure is a company-profile document: it does not state connector types, cable specifications, pinouts, dimensions, weights or mounting details — those gaps are flagged and consolidated in Section 5.

TCU — Surge Track S350 (closest match to installed architecture)
Power supply	Self-Powered or String-Powered (current-source technology, "no pony panel needed") Bro p.3
Aux PV panel (self-powered)	60 W / "customizable" — voltage window TO BE CONFIRMED Bro p.3
Battery	LiFePO4, 25.6 V, 3.4 Ah / 6 Ah, CC-CV Bro p.3
Motor type	Brushless / Brushed — voltage & current rating TO BE CONFIRMED Bro p.3
Communication	Sub-1GHz / LoRa Mesh / RS485 / Bluetooth · Modbus RTU · zero-config self-forming mesh Bro p.3
Protection / environment	IP67; −35…+60 °C; altitude < 4000 m Bro p.3
Tracking	< ±1° accuracy; range −60…+60°; astronomical algorithm + position sensor; backtracking; night return Bro p.3
Consumption	0.05 kWh/day Bro p.3
Protections	Overcurrent; over/under-voltage; wind / snow / rain modes (require sensors) Bro p.3
Other TCU variants	AC150/350/450 (90–264 VAC) · DC24 (24 VDC) · S350-MD0X string-powered multi-drive Bro p.9–11
Motor Drive Unit (MD0X)	24 V rated, 150 W rated, IP65, −30…+60 °C Bro p.11
Connectors / cables / dimensions	NOT STATED IN BROCHURE — TO BE CONFIRMED

NCU
Power supply	220 VAC / 24 VDC Bro p.4
Communication	Sub-1GHz / LoRa Mesh / RS485 / 4G / Ethernet Bro p.4
Protocols	Modbus RTU / MQTT — Modbus TCP server not explicitly stated: TO BE CONFIRMED Bro p.4
Protection / environment	IP65; −30…+60 °C; < 4000 m Bro p.4
Features	Edge computing (local aggregation & anomaly detection); GPS; bulk parameter config; broadcast control; OTA firmware for NCU and TCUs; historical data query; weather-station integration Bro p.4
Enclosure / PSU / protections	NOT STATED — TO BE CONFIRMED
Ecosystem
SCADA	SurgeTrack Solar SCADA — on-premise / cloud / mobile; Golang+Vue stack, MySQL + TDengine + Redis, TLS Bro p.5
Weather station	Ultrasonic wind speed/direction, temperature/humidity, laser snow depth, tipping-bucket rain gauge, acoustic hail flux Bro p.6
Control logic	Auto-stow at 18 m/s wind; adaptive cadence; smart backtracking; AI tracking (+1–8% claimed, 2 GW fleet validation claimed) Bro p.7
Drive architectures	1C1C (one controller per motor, 0.1°) and 1C2C (one controller drives two motors, ±0.3° sync, −50% controllers, −40% cabling) Bro p.8,11
Certifications stated	ISO-9001, CE, IP67 test, EMC, built-in surge protection Bro p.2,12
Not stated	IEC 62817 · Chile RF homologation (SUBTEL) · UN38.3 · warranty terms — TO BE CONFIRMED

4Compatibility Matrix

Verdict per row: ✅ compatible ⚠️ needs adapter / verification ❌ mismatch TO BE CONFIRMED. Scope: controllers only — Alion tracker mechanics and Longi modules remain in place.

4.1 Input power & cabling

Item	Installed (P4Q Suntrack)	Proposed (Solarsurges)	Verdict
TCU supply architecture	Self-powered: 30 W/36 V aux panel + LiFePO4 25.6 V — zero field cabling	S350 self-powered (60 W / customizable panel) or string-powered; LiFePO4 25.6 V	✅ matches
Reuse of existing aux panels	86× ZPS2X36C001, 30 W / 36 V, MC4 leads (input window today 26–40 V)	"60 W / customizable" — acceptance of 30 W / 36 V input not stated	TO CONFIRM
Motor drive	24 VDC brushed, ≤ 6 A per TCU, overcurrent flag > 15.5 A	Brushed supported; MD0X drive 24 V / 150 W; main-TCU ratings unstated	⚠️ verify current
NCU supply	100–240 VAC (230 VAC on site), 24 VDC internal rail	220 VAC / 24 VDC	✅
Cable gauges	Motor 2×16 AWG (1650 mm pigtail); panel PV1-F 2.5 mm²; captive to TCU glands	Not stated	TO CONFIRM
Weather sensor power	RSU: 90–264 VAC, 12.5 W	Weather station power not stated	TO CONFIRM

4.2 Connectors

Item	Installed	Proposed	Verdict
Motor connector	WEIPU SP21 series 3-pin screw-coupling (field-verified 13-Jul-2026; P4Q docs state Binder 99-5606-75-03 bayonet — installed part differs). Pinout 1 = M−, 2 = M+, 3 = NC; motor-side 6.35 mm crimp receptacles	Not stated	⚠️ mate SP21 or re-terminate
Aux panel connector	MC4-compatible pair (female is non-standard Sungold FL02701)	Not stated	TO CONFIRM
Service port	WEIPU SP1312/S4C RS-485 (PC + USB converter)	Bluetooth / mobile / PC debugging; physical port unstated	✅ functional equivalent
NCU cable entries	BRES-54 membrane seals + antenna bulkhead	Enclosure/entries not stated (IP65)	TO CONFIRM

4.3 Communications

Item	Installed	Proposed	Verdict
Field network NCU↔TCU	Modbus over Zigbee 2.4 GHz mesh, AES-128	Sub-1GHz / LoRa mesh / RS485 / Bluetooth — no Zigbee	❌ not interoperable
Consequence	Full-fleet swap required in one campaign: 1 NCU + 86 TCUs + wind sensing (consistent with the vendor's stated position — mixed operation impossible)		⚠️ plan accordingly
RF regulatory (Chile)	2.4 GHz ISM, ETSI EN 300 328 (operating today)	Sub-1GHz band & SUBTEL homologation not stated (Chile band plan 915–928 MHz)	TO CONFIRM
Upstream to plant SCADA	Ethernet Modbus TCP to GreenPowerMonitor; published 86-address register map	Ethernet / 4G available; protocols listed Modbus RTU / MQTT	⚠️ Modbus TCP + map to confirm
Wind protection chain	RSU + anemometer → NCU wind alarm → fleet safe position	Weather station → NCU; auto-stow at 18 m/s	✅ equivalent (threshold config to confirm)

4.4 Module & mechanical compatibility

Item	Installed	Proposed	Verdict
PV modules	Longi LR6-72PD double-glass bifacial (1971×990×6 mm, ≤1500 V, Imp ≈ 9 A) on Alion clamps	Controller-only retrofit; vendor claims module-type adaptability	✅ unaffected
Tracking range	Alion AST rotation > ±60°; TCU tracks with internal inclinometer	−60…+60° range; astronomical + position sensor	✅ range matches
Stow interlock	Storm-Lock (Geneva mechanism) engages at stow	Stow logic parameters not stated	TO CONFIRM
TCU mounting	Bracket on A-frame; 4 holes, 317×129 mm pattern, shared with aux panel	Dimensions / mounting not stated	TO CONFIRM
Dual-motor trackers	5 trackers (T00S, T01S, T26N, T28N, T49S) run 2 motors = 2 TCUs each today	1C2C mode: one controller, two synchronized drives (±0.3°)	✅ opportunity — verify fit
Environmental rating	TCU IP65, −10…+60 °C / NCU IP66 IK10	TCU IP67, −35…+60 °C / NCU IP65	✅ TCU better ⚠️ NCU box

4.5 Certifications

Item	Installed	Proposed	Verdict
CE / EMC	CE; IEC 61000 series (test reports on file)	CE, EMC claimed	✅ nominal — request reports
Tracker-controller qualification	IEC 62817 test reports on file	Not stated	TO CONFIRM
Radio certification	ETSI EN 300 328 (2.4 GHz)	Not stated; Chile homologation unknown	TO CONFIRM
Battery transport	UL1642 cells; IATA lithium procedures documented	LiFePO4 stated; UN38.3 not stated	TO CONFIRM

Bottom line. (1) Self-powered architecture matches — no new LV cabling, provided aux-panel reuse and motor-current margins are confirmed. (2) The single hard physical interface is the motor connector on 86 pigtails — field-verified as WEIPU SP21 series screw-coupling (documentation states Binder 99-5606-75-03). (3) Modules are untouched. (4) The decisive mismatch is the radio: Zigbee vs Sub-1GHz forces a one-campaign full-fleet swap plus SCADA re-integration and Chilean RF homologation.

5Open Questions — Vendor Checklist

Every item marked TO BE CONFIRMED above maps to this checklist. V = answer expected from Solarsurges · iE = iEnergia internal verification.

A · Motor drive & power (critical)

A1Maximum continuous and peak motor current of the S350 TCU (and MD0X drive) at 24 VDC. Installed motors run ≤ 6 A with a > 15.5 A overcurrent flag.V

A2Can the S350 charge from the existing 30 W / 36 V aux panels (input window 26–40 VDC today), or does it require its stated 60 W panel?V

A3If new aux panels are required: dimensions, weight, connector type, and bracket interface for 86 positions.V

A4Confirm installed battery size (3 Ah vs 6 Ah packs) by field check / purchase records.iE

A5Motor duty cycle supported (pulse / rest profile) vs the installed limit of 30 s @ max current + 10 s rest.V

B · Connectors & cabling (critical)

B1Motor connector: does the new TCU mate the WEIPU SP21 series 3-pin screw-coupling connector (field-verified; P4Q documentation states Binder 99-5606-75-03 — sample a few more trackers to confirm fleet uniformity) directly, via adapter cable, or does it require re-terminating 86 motor pigtails?V

B2TCU-side cable set: lengths, gauges, glands supplied? (today: motor 2×16 AWG 1650 mm; panel PV1-F 2.5 mm² ~500 mm)V

B3Aux-panel connector type (standard MC4?). Note the existing female is a non-standard MC4-compatible part.V

B4Physical wired service port (RS-485) available besides Bluetooth? Connector type?V

B5NCU enclosure: model, IP/IK rating, dimensions, cable entries, antenna bulkhead. Is an outdoor cabinet (≥ IP66, like today's) included?V

C · Communications & SCADA (critical)

C1Exact Sub-1GHz operating band and channel plan; SUBTEL (Chile) homologation status for TCU, NCU and any 4G module.V

C2Does the NCU expose a Modbus TCP server over Ethernet (not only Modbus RTU / MQTT)? Provide the full register map.V

C3Who performs the plant-SCADA (GreenPowerMonitor) re-integration, and is SurgeTrack SCADA mandatory or optional?V / iE

C4RF coverage design for 81 trackers on this layout: is one NCU still sufficient (as today), or are repeaters / multiple NCUs proposed?V

C5Weather station: sensor list, accuracy, mounting and power; can the existing anemometer be reused?V

C6Is the wind-stow threshold configurable? (brochure fixes 18 m/s; site threshold must match the Alion structural specification.)V

D · Mechanical & site integration

D1TCU dimensions, weight and mounting pattern; adapter plates for the existing 317 × 129 mm bracket or new brackets for 86 positions?V

D2Inclinometer: internal or external? Accuracy? Mounting-orientation constraints on the Alion A-frame.V

D31C2C applicability to the 5 dual-motor trackers: these are two independent drives on one long single-axis tracker — not a dual-axis system.V

D4Stow behavior compatibility with the Alion Storm-Lock mechanism: stow angle and approach profile.V

D5Backtracking commissioning: who loads row-geometry parameters and validates tracking after the swap?V / iE

E · Certifications, quality & commercial

E1IEC 62817 design-qualification report for the proposed TCU (exists for the installed unit).V

E2EMC / CE test reports (not only marks) and surge-immunity class.V

E3UN38.3 + IATA documentation for LiFePO4 packs shipped to Chile.V

E4Warranty term and RMA process (brochure states none).V

E5OTA firmware security model (signing, rollback) for TCU and NCU.V

E6Contactable references for retrofit projects on third-party trackers (brochure lists one "tracking system upgrade" project).V

E7Spare-parts availability commitment (years) for the proposed hardware generation.V

6Annex — Drawings & Photos

Every figure references its source document and page. Additional documentation (full manuals, datasheets, Modbus maps, IEC 62817 reports) can be shared on request under NDA.

**TCU connector faces.** P4Q Installation Manual D002-PS17026, p.23

**Motor / panel connector reference.** Installation Manual, p.24

**Motor connector as installed — WEIPU SP21 series.** Site photo, 13-Jul-2026

**Motor connector mating face (3 contacts).** Site photo, 13-Jul-2026

**Motor cable drawing (documents Binder 99-5606-75-03 — installed part is WEIPU SP21).** ASSY-C16003#38 Rev A

**Power (+) cable drawing (MC4).** ASSY-C16003#01 Rev A

**30 W / 36 V aux PV panel.** P4Q drawing ZPS2X36C001

**Zigbee mesh topology.** Installation Manual, p.17

**NCU internal assembly.** ASSY-X12092 Rev A

**Installed NCU cabinet (site photo, 2019).** iEnergia O&M archive

**NCU cable entries.** P4Q NCU technical data

**NCU ↔ SCADA integration (as-built detail).** PLA-COM-01

**String distribution CB01–CB18.** PLA-T-01 As Built

**Tracker → motor ID map (86 IDs).** PLA-T-01 As Built

**Longi LR6-72PD 350–370M datasheet.** Longi Solar, 2018-04-01

**Tracker distribution layout.** PLA-T-01 As Built, Dec 2023

Original documents — cabling & connections (download)

Original manufacturer PDFs covering the cable assemblies and connection interfaces of the installed TCU, provided for direct engineering verification of connector and cable compatibility.

Document	Content	Size	Download
ASSY-C16003#38 Rev A — Motor cable	Motor cable assembly: Binder 99-5606-75-03 connector, pin/color table, 2×16 AWG UL2464 cable, gland M16×1.5, crimp receptacles. Note: installed connector field-verified as WEIPU SP21 series (see §2.1 photos)	138 KB	PDF ↓
ASSY-C16003#01 Rev A — Power (+) cable	Aux-panel power (+) cable: MC4-compatible female (Sungold FL02701), PV1-F 2.5 mm² 0.6/1 kV, gland M12×1.5	100 KB	PDF ↓
ASSY-C16003#02 Rev A — Power (−) cable	Aux-panel power (−) cable: MC4-compatible male, PV1-F 2.5 mm²	113 KB	PDF ↓
ZPS2X36C001 — Aux PV panel drawing	30 W / 36 V auxiliary panel: dimensions, cable set (2× PV1-F 2.5 mm²), MC4-compatible connector pair	93 KB	PDF ↓
D002-PS17026 Rev A — TCU Installation & Maintenance Manual	Full installation manual: mounting pattern, cable glands, electric connection (§4.5 — motor, power, comms, antenna), maintenance	1.1 MB	PDF ↓