Why is the camp power‑supply solution critical?
Off‑grid stable power supply is required for remote‑site mining areas, highway construction sites and island resorts.
There are two mainstream technical routes at present: grid‑forming by diesel generators and grid‑forming by PV‑energy‑storage systems.
This article compares the two solutions from four dimensions: technical route, applicable scenarios, cost and stability.
Grid‑Forming by Diesel Generator
Technical Route: Diesel generator with AVR voltage regulation, adopting passive voltage support.
Applicable Scenarios: Temporary camps with construction duration less than 6 months, sites with insufficient sunlight, or projects requiring urgent power‑on.
Cost Analysis: Low initial procurement cost (30 kW unit: approx. $4,434‑7,390). Annual operating cost for diesel generation is around $65,000 (diesel fuel + maintenance). Fuel transportation is difficult in remote areas, which may easily lead to fuel supply shortage.
Stability: For diesel‑generator solution: voltage fluctuation ≤ ±5%, frequency fluctuation ≤ ±0.2 Hz. Slow response time (5‑6 s), weak capacity to withstand inrush current (3‑5 times of load) during motor start‑up. Black‑start function is unavailable after power grid outage.
Grid‑Forming by PV‑Energy‑Storage System
Technical Route: Photovoltaic + lithium‑iron‑phosphate battery + off‑grid PV inverter + microgrid energy management system (EMS). Diesel generator is only used as backup power source.
Applicable Scenarios: Long‑term camps with operation period over 1 year, daily power consumption above 300 kWh, sites with sufficient sunlight, or projects subject to carbon‑emission assessment requirements.
Cost Analysis: High initial investment (20 kW PV + 167 kWh energy‑storage: approx. $52,000‑74,000); annual operating cost $35,000. The levelized cost of energy is only $0.11‑0.16/kWh.
When including emergency diesel consumption, annual cost is about $6,207, representing a 90.1 % cost reduction. Payback period is normally 3‑5 years.
Stability: For PV‑energy‑storage solution: voltage fluctuation ≤ ±3%, frequency fluctuation ≤ ±0.1 Hz; multi‑source switching time ≤10 ms. It delivers faster response, higher control precision and superior power‑supply quality.
Selection Recommendations
Total cost over 5‑year full‑life cycle: approx. $350,000 for diesel‑generator solution; approx. $97,000 for PV‑energy‑storage solution, with 74.2 % total‑cost reduction for PV‑energy‑storage option.
Tight budget, short project duration, insufficient sunlight: Choose diesel‑generator‑formed grid.
Pursue long‑term cost savings, emphasize environmental protection, sufficient sunlight: Choose PV‑energy‑storage‑formed grid.
Optimal solution: Adopt “PV-energy-storage-diesel” micro-grid mode. Power supplied by PV on sunny days, by energy-storage on cloudy days, and diesel generator is activated only under extreme weather conditions.
Need a customized camp power‑supply solution?
Xuzhou Zm-Besta provides container‑type foldable integrated PV‑energy‑storage cabins.
Please contact us for quotation.
Email: info@xzbesta.com
