A 60-villa resort at 2,800 m elevation in Yunnan Province replaced its round-the-clock diesel generation with a BeSafe H50 battery microgrid. The result: 87% reduction in diesel runtime, silent overnight power for guests, and a new "carbon-neutral stay" marketing positioning.
The resort sits on a 14-hectare site in Shangri-La, Yunnan, surrounded by old-growth forest. Connection to the regional grid would have required 28 km of mountain transmission line and was cost-prohibitive. Before the microgrid upgrade, the resort ran two 250 kVA diesel generators 24/7, switching loads between them. Diesel was trucked in over a single winding mountain road — 2,200 L every 9 days, at increasing cost.
Guest load was growing (occupancy was rising year-on-year), but the site was already at the practical limit of its diesel infrastructure. Generator maintenance intervals were shortening due to continuous heavy load, and the noise was a constant source of guest complaints — particularly at night, when the generators had to run to keep villa heating and hot water operational.
The resort's engineering team evaluated three options: (a) add a third diesel generator, (b) extend the grid connection, (c) build a solar-plus-storage microgrid. The microgrid won on three dimensions:
BeSafe was selected for the battery side because the H50 cabinet is rated for outdoor deployment (IP54, C3 anti-corrosion) and operates reliably at high elevation where air density is 30% lower than at sea level. The active air-cooling system was specifically validated for low-air-density operation.
| Component | Specification | Quantity |
|---|---|---|
| PV Modules | 550 W bifacial mono (anti-PID, low-temperature coefficient) | 582 panels |
| Total PV Capacity | 320 kWp DC | — |
| PV Mounting | Fixed-tilt ground mount, 25° tilt, south-facing | — |
| Battery Cabinets | BeSafe H50 (50 kW / 53.76 kWh each) | 10 cabinets (8 active + 2 standby) |
| Total Storage | 400 kW AC (active) / 430 kWh (active) | — |
| Existing Diesel | 250 kVA each, retained as backup | 2 units |
| Microgrid Controller | BeSafe EMS with diesel coordination logic | 1 controller |
| Grid-Tie | None (fully off-grid) | — |
| Backup Runtime (No Sun) | ~22 hours at 18 kW average night load | — |
Yunnan enjoys more than 2,400 sunshine hours per year, with clear-sky conditions dominating October through May. The microgrid is sized for the average daily solar yield minus 30% derating for cloud cover and panel soiling. The BeSafe EMS runs three operating modes automatically:
The economic case was even better than the financial model predicted: a 28% rise in global diesel prices during the project's first year added USD 60,000 of unanticipated savings. The marketing side was equally successful — the resort now markets itself as a "carbon-neutral mountain retreat" and reports a 22% increase in average length of stay and a 15% occupancy rate increase attributable to the new positioning.
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