2000 kW Source-Grid-Load-Storage Microgrid: PV 1000 kWp + BESS 800 kW/1742 kWh + Auto-Transfer Deep-Read
PV 1000 kWp · BESS 800 kW/1742 kWh · Diesel 600 kW standby · 2×SCB13-2000/10 N+1 · on/off-grid
1 · TL;DR Conclusion
Conclusion: this 2000 kW source-grid-load-storage microgrid combines 1000 kWp PV + 800 kW/1742 kWh BESS + 600 kW diesel auto-transfer + a 10 kV grid feed with grid-tied/islanding, on 2×SCB13-2000/10 transformers (N+1) plus a grade-1 end-transfer switch (GATS) — configurator total ≈ $914,457, EPC ≈ $990,000, 4-yr payback, 24.80% IRR, 609.1 t CO2/yr avoided (feasibility-level).
- •Multi-source mix: 1000 kWp PV (63% share) + 800 kW BESS (38%) + 600 kW diesel auto-transfer, 4400 kW installed
- •Grid-tied/islanding + black-start (600 kW diesel auto-start, verified); 2 s auto-transfer
- •Grade-1 800 kW end-transfer switch (GATS-630) + 300 kW EPS, 175% backup coverage
- •PV self-use ≈$261,482/yr (incl. BESS shaving)
- •Economics: $990,000 EPC, 4-yr payback, 24.80% IRR, LCOE $0.1011/kWh, 609.1 t CO2/yr avoided
2 · Solution Overview
A source-grid-load-storage microgrid unifies sources (PV/diesel/grid), the network, loads and storage under one EMS — the archetypal architecture for zero-carbon industrial parks and large campuses. This 2000 kW design has PV for base load, BESS for smoothing+shaving+demand, diesel for auto-transfer backup, the grid as the main tied supply, and a grade-1 end-transfer switch keeping critical production lines powered.
| Source | Role | Share kW | Share |
|---|---|---|---|
| Grid 10 kV | base | 0 kW | 0% |
| Solar PV 1000 kWp | variable | 1000 kW | 63% |
| BESS 800 kW / 1600 kWh | variable | 600 kW | 38% |
| Diesel 600 kW | backup | 0 kW | 0% |
3 · Design Process & Rationale
1. Requirement identification
A zero-carbon industrial park wants both high renewable share and uninterrupted critical production (800 kW grade-1 load). Two hard requirements are locked first: source-grid-load-storage dispatch and reliable auto-transfer — mandating BESS, diesel and end ATS.
2. Load grading
2000 kW total → 1742 kW demand; 800 kW grade-1, 800 kW grade-2, 200 kW sensitive. Grade-1 needs an end transfer switch (GATS-630) + EPS; grade-2 is covered by grid+BESS.
3. Source mix
1000 kWp PV (63%) + 800 kW/1742 kWh BESS (38%, 2 h) + 600 kW diesel standby (auto-transfer) + 10 kV grid, dispatched by one EMS.
4. Transformer sizing
1742 kW → 1684 kVA → 2000 kVA tier + N+1 (2 dry-type units, indoor park). 84% loading after one trip (N-1 pass); grade-1 load transfers to the other source via end ATS.
5. Auto-transfer & switching
Grade-1 end GATS-630 auto-transfer: on grid loss it switches to diesel/BESS within 2 s; gridMode=grid-tie-island + blackStart=yes, 600 kW diesel black-starts, 175% backup coverage.
6. Distribution & protection
MV incomer → 2 dry-type transformers → MNS LV switchgear (with bus-tie) → feeders + grade-1 end ATS. LV fault 58.91 kA vs 80 kA breaking; selectivity 24.56×, grading satisfied.
7. Power quality
200 kW sensitive load + harmonics (THDi 20%) get reactive compensation + detuned reactors; storage/diesel converters coordinated to avoid circulating current.
8. Economics
BESS shaves 800 kW×4 h saving ≈$151,840/yr; PV generates 1,015,200 kWh/yr. Overall 4-yr payback, 24.80% IRR, LCOE $0.1011/kWh, 609.1 t CO2/yr avoided.
Pain Points → Solution → Evidence
Critical production (800 kW grade-1) cannot drop for a second
End auto-transfer GATS-630 + 300 kW EPS: switch to diesel/BESS within 2 s
N-1 pass (2×2000 kVA) + 175% backup coverage + GATS/EPS in BOM
High renewable share causes grid fluctuation and hard peak regulation
800 kW/1742 kWh BESS smoothing + shaving + demand, EMS source-grid-load-storage coordination
economic.shaving: 800 kW×4 h, $151,840/yr saved
Pure-diesel backup costs $327k/yr — unsustainable
PV+BESS first, diesel only for auto-transfer emergencies
Pure diesel $327,040 vs hybrid $232,400; ≈$151,840/yr saved
When does it pay back?
≈$990,000 EPC; PV+BESS save ≈$261,482/yr
economic: 4-yr payback, 24.80% IRR, 497% 25-yr ROI
4 · Key Parameter Deep-Read
| Parameter | Value | Basis | Impact & Boundary |
|---|---|---|---|
| Transformer capacity | 2×2000 kVA (N+1 dry-type) | 1742 kW → 1684 kVA → 2000 kVA tier + one spare | 84% loading; stays 84% after a trip (N-1 pass) Step to 2500 kVA for growth |
| PV capacity | 1000 kWp | 63% share; 1,015,200 kWh/yr generation | Serves base load by day, cutting diesel run and bills Limited by site area and BESS absorption |
| BESS capacity | 800 kW / 1742 kWh (2 h) | Smoothing + shaving + demand, 2 h duration | Shaves 800 kW×4 h, saving $151,840/yr Long islanding needs ≥8 h plus a black-start check |
| Diesel capacity | 600 kW standby · auto-transfer | Emergency auto-transfer + black-start (600 kW verified) | The only emergency source for grade-1 end transfer standby = emergency-rated, cheaper than prime |
| Auto-transfer | GATS-630 end transfer, 2 s | 800 kW grade-1 load must be uninterrupted | Transfers within 2 s; 175% backup coverage Transfer time vs load criticality per IEC 60364 |
| Grid mode | grid-tie-island + black-start | Zero-carbon parks must island and black-start | Anti-islanding prevents backfeed; 2 s ATS Grid approval per local grid code (gridCodeNote) |
| Economics | IRR 24.80% · 4 yr | $990,000 EPC + $261,482/yr saving + 25-yr cashflow | The core investability metric Tariff, irradiation and load factor are the key sensitivities |
5 · Drawing Deep-Read
The following drawings are shown for reference (full set in the configurator “View design document”):
6 · Operation Demo (Deep-Read)
Energy flow
Grid-tied: PV 1000 kW serves base first, surplus charges BESS; BESS discharges 800 kW at peak and charges at valley; grid fills the gap. On grid loss: auto-transfer switches to diesel/BESS in 2 s, grade-1 load stays up.
Grid failure / auto-transfer
Press 'Grid failure': the grade-1 end GATS transfers to 600 kW diesel black-start + BESS within 2 s (175% backup coverage); in the N-1 case one transformer trips and the other continues at 84% loading.
Economics
1,015,200 kWh/yr generated, 0.8 self-use + surplus export; PV self-use ≈$261,482/yr (incl. BESS shaving); $990,000 invested, 4-yr payback, 24.80% IRR, LCOE $0.1011/kWh.
24h operation
A typical-day curve: daytime PV overlaps load, peak-time BESS discharge shaves the peak, overnight valley charging, diesel only during auto-transfer/black-start — source-grid-load-storage coordination in time order.
Other views (shown): Power quality & harmonics · Voltage profile · Scheme features · Environmental derating
7 · Economics & Payback
Equipment total ≈ $914,457, EPC ≈ $990,000 (incl. PV/BESS/diesel/auto-transfer/distribution/installation). PV self-use saves ≈$261,482/yr (incl. BESS shaving); overall 4-yr payback, 24.80% IRR, 497% 25-yr ROI, LCOE $0.1011/kWh, NPV $1,584,295, 609.1 t CO2 avoided/yr.
8 · FAQ
How do you understand source-grid-load-storage integration?
What is auto-transfer and how fast?
How big a BESS?
How is black-start implemented?
When does it pay back?
Pure diesel vs source-grid-load-storage hybrid?
How is the 800 kW grade-1 load kept uninterrupted?
How much PV should be installed?
Could auto-transfer accidentally parallel two sources?
What grid-connection paperwork is needed?
Special Considerations
- Grade-1 800 kW end auto-transfer (GATS-630) + 300 kW EPS are included; transfer time vs load criticality must be confirmed per IEC 60364 by the design institute.
- The auto-transfer interlock prevents accidental dual-source paralleling; selectivity 24.56×, grading satisfied; a full transfer test is required before commissioning.
- 2 h storage covers shaving/demand; long islanding needs ≥8 h plus a black-start capacity check.
- 200 kW sensitive load + THDi 20% have reactive compensation + detuned reactors; add APF if limits are exceeded.
- Feasibility-level estimate; drawings pending refinement by a licensed design institute.
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