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300 kWp Industrial Rooftop Solar | EPC Engineering and Budget

Industrial rooftop PV 300 kWp, 300.16 kWp DC, 250 kW AC. English 78-line BOQ, indicative budget, not a firm quote.

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QUANGANHCONS | INDUSTRIAL EPC ENGINEERING

Industrial rooftop PV 300 kWp: equipment and EPC reference

A structured technical reference for factories evaluating rooftop PV, site electrical interfaces and EPC budgets.

QAC-SOL-EST-20261109-903BFC76 · QAC Solar 8.21.0

300.16 kWpPV DC nameplate
250 kWTotal inverter AC
469 modulesLONGi 640 Wp modules

1. Applications and self-consumption

The two 125 kW inverter reference arrangement needs a coordinated AC collector and MSB/PCC connection with verified transformer reserve capacity. The system is a grid-connected self-consumption PV reference, excluding battery storage; it is not evidence of a completed installation.

2. Equipment nameplate and electrical configuration

Capacity class 300 kWp
PV modules 469 × LONGi Solar LR7-72HVH-640M, 640 Wp
Installed DC power 300.16 kWp
Inverters 2 × Sungrow SG125CX-P2
Combined AC rating 250 kW
PV strings 27, subject to MPPT allocation checks
DC/AC ratio 1.2
Reference QAC-SOL-EST-20261109-903BFC76 · 09 Nov 2026

3. Engineering calculations

PDC = 469 × 640/1,000 = 300.16 kWp. DC/AC ratio = 300.16/250 = 1.2. PV output and clipping depend on inverter model, MPPT assignment, module temperature and irradiance.

At 400 V three phase and assumed power factor 0.99, aggregate AC current is 250 × 1,000/(√3 × 400 × 0.99) ≈ 364.49 A. This is a mathematical aggregate, not a one-feeder design. Calculate protective device ratings, cable ampacity, voltage drop and prospective fault level separately for each AC section and PCC.

4. Roof, protection and grid interface

The two 125 kW inverter reference arrangement needs a coordinated AC collector and MSB/PCC connection with verified transformer reserve capacity. The system is a grid-connected self-consumption PV reference, excluding battery storage; it is not evidence of a completed installation.

5. Programme and acceptance

Survey and SLD approval → material procurement → safe installation of mounting and PV DC/AC circuits → protection/earthing/insulation tests → commissioning and as-built documentation. Project duration, utility requirements and exclusions will be confirmed after survey.

Indicative WBS/Gantt (no fixed dates)

1. Demand monitoring and survey

2. Electrical/PCC and roof design

3. Purchasing and HSE

4. Rooftop installation/DC/AC wiring

5. Commissioning and handover

6. 300 kWp Solar estimate — view and download

Quote reference: QAC-SOL-EST-20261109-903BFC76 · QAC Solar 8.21.0 · Pre-survey reference

Before VAT: 3,601,920,000 đ · Illustrative VAT 10%: 360,192,000 đ · With VAT: 3,962,112,000 đ

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Preview matching source-locked PDF below. This is a preliminary budget; unit prices can be rounded and the actual utility/MV scope requires independent verification.

7. 12-month production and a representative 24-hour day

Example only, not surveyed production or measured load: PVGIS 5.3/ERA5 2023 HCMC (10.8231,106.6297), 10° south-facing, PVGIS loss 14% once, AC limits applied per configuration. Hypothetical factory operates Mon–Sat: 75% AC daytime load, 50% lunch, 35% evening, 18% overnight/Sundays; zero export assumed.

Monthly energy (kWh)Monthly energy (kWh) — Available PV, Direct PV self-use
Month Available PV Direct PV self-use
Month PV kWh Self-use kWh Curtailed kWh Load kWh
1 31,209 27,463 3,746 75,080
2 36,130 31,093 5,037 68,640
3 42,118 36,422 5,696 76,680
4 38,148 32,989 5,160 72,400
5 35,362 32,273 3,089 76,680
6 30,742 28,045 2,697 74,000
7 28,866 26,450 2,416 75,080
8 35,814 32,222 3,592 76,680
9 29,117 26,977 2,141 74,000
10 32,088 28,579 3,509 75,080
11 31,591 28,045 3,546 74,000
12 34,540 30,749 3,791 75,080

Representative day: 15 Mar 2023

Power over 24 hours (kW)Power over 24 hours (kW) — PV output, Assumed factory load, Direct PV self-use
Hour (UTC+7) PV output Assumed factory load Direct PV self-use
Show 24-hour loads and assumptions
Hour ICT PV kW Load kW Self-use kW
0 0 45 0
1 0 45 0
2 0 45 0
3 0 45 0
4 0 45 0
5 0 45 0
6 9.1 45 9.1
7 67.2 112.5 67.2
8 121.5 187.5 121.5
9 170.7 187.5 170.7
10 196.1 187.5 187.5
11 207.8 187.5 187.5
12 205.7 125 125
13 131 187.5 131
14 113.4 187.5 113.4
15 85.7 187.5 85.7
16 50.5 187.5 50.5
17 11.5 187.5 11.5
18 0 87.5 0
19 0 87.5 0
20 0 87.5 0
21 0 87.5 0
22 0 45 0
23 0 45 0

JRC PVGIS 5.3 ERA5 2023 · QAC-SOLAR-INDUSTRIAL-HCM-2023-R1

8. Rooftop PV installation and equipment images

Images already in the QAC content library; not photographs of this exact system.

Industrial PV reference image 1
Industrial PV reference image 2
Industrial PV reference image 3

9. Standards, checkpoints and FAQ

Review IEC 62548-1, IEC 60364-7-712 and applicable Vietnamese electrical/fire/building requirements. PV module family reference: LONGi 640 Wp datasheet; verify the exact inverter datasheet and firmware.

Confirm MPPT and cold Voc/Isc, AC/DC SPD and selectivity, earthing, roof/wind, utility interface and fire safety before construction.

Is this a final turnkey MV EPC quotation?

No. Only the priced BOQ scope is included. MV collector, new substation and PCC upgrades must be validated separately.

10. Construction video and related solutions

Watch PV installation video on YouTube

Video reference only, not project-completion evidence.

Industrial rooftop solar · Solar estimate library · Substation services

11. Estimate another solar system

QUANGANHCONS · SOLAR EPC

Choose Solar & storage for your property

From electricity needs to a preliminary system and budget. No contact details required.

Technical settings & supply scope

Preliminary defaults are selected. Adjust the roof, equipment, connection and cable routes here.

Battery energy storage (optional)

Capacity is rounded to whole modules/cabinets. Backup defaults: SOC 90% to 10%, SOH 90%, discharge efficiency 95%, power derating 10%. Adjust these assumptions through the assistant when data is available. Backup is priced separately; compatibility and transfer time remain unverified.

Scope and budget basis

Preliminary quantities and rates follow the entered configuration and require survey/design confirmation. Basic scope includes standard rails, clamps and module attachments on a suitable existing structure. Select raised frames, foundations, reinforcement, storage or a new transformer to price additions.

Roof height is measured from ground; rack clearance is separate, above the roof/ground surface. Area and row pitch are layout estimates, not approved drawings or wind, structural, waterproofing or fire assessments. VAT follows the quote configuration and requires contract/invoice confirmation.

Automatic pre-survey calculations

Enter your sizing input to see module area, access area, roof requirement, module mass, capacity and electrical configuration.

Developed and operated by QuangAnhcons. Preliminary results require site survey and written confirmation before ordering or construction.

Solar 8.21.0 · QAC-UI-QUOTE 1.1.1

© 2026 QUANG ANH CONSTRUCTION ELECTRICITY COMPANY LIMITED. Quotation prepared by QuangAnhcons. Please retain the issuer name and reference when saving or sharing. Third-party names and materials belong to their respective owners.