Power Requirements: Diesel vs Electric

Reliable power is essential for profitable wash plant operations. Whether using diesel generators or electric hookups, understanding power requirements helps you plan costs, select appropriate equipment, and avoid expensive mistakes that can shut down your operation.

Most mining operations rely on diesel generators due to remote locations, but each option has advantages depending on your situation.

Power Requirements by Wash Plant Model

Power consumption varies significantly by machine size and configuration. Here are the standard requirements:

Why Generator Sizing Exceeds Motor Requirements

• Starting surge: Electric motors require 3-5x running current during startup
• Multiple motors: Conveyors, water pumps, and accessories add to total load
• Power factor: AC motors typically run at 0.8-0.9 power factor
• Altitude derating: Generators lose capacity at elevation
• Temperature derating: Hot weather reduces generator output
• Safety margin: Avoid overloading generator for reliability

Diesel Generator Options

Most mining operations use diesel generators due to remote locations and fuel availability worldwide.

Generator Types and Applications:

Fuel Consumption Factors:

• Load factor: Generators are most efficient at 70-80% load
• Engine condition: Well-maintained engines use 15-20% less fuel
• Altitude: Higher elevations increase fuel consumption
• Temperature: Hot weather reduces efficiency
• Fuel quality: Clean fuel improves performance and longevity

Electric Hookup Option

Electric power from the grid is rare in mining but offers advantages when available.

When Electric Power Makes Sense:

• Quarry operations: Established sites with existing electrical infrastructure
• Urban mining: Construction sand and gravel operations near cities
• Seasonal operations: Short-term utility hookups may be economical
• Permanent installations: Long-term operations justifying electrical installation

Electric Power Advantages:

• Lower operating costs: Electricity typically costs 50-70% less than diesel
• No fuel logistics: Eliminates fuel delivery and storage
• Consistent power: No voltage fluctuations or power derating
• Environmental benefits: Lower emissions and noise
• Less maintenance: No generator maintenance requirements

Electric Power Disadvantages:

• Infrastructure costs: $10,000-50,000+ for utility hookup
• Limited availability: Most mining locations lack grid access
• Utility reliability: Power outages stop operations
• Demand charges: Commercial rates include peak demand penalties

Generator Placement and Installation

Proper generator placement is crucial for safety, efficiency, and maintenance access.

Placement Guidelines:

• Distance from wash plant: 50-100 feet minimum to reduce noise and vibration
• Level surface: Generators must be level for proper oil circulation
• Ventilation: Adequate airflow for cooling and exhaust dispersion
• Access roads: Fuel truck and service vehicle access
• Drainage: Prevent standing water around generator

Weather Protection:

• Shelter options: Temporary canopies, permanent buildings, or containerized units
• Rain protection: Prevent water ingress into electrical components
• Wind protection: Reduce cooling air disruption in high winds
• Sun protection: Reduce overheating in hot climates

Electrical Connections:

• Cable sizing: Use appropriate gauge wire for distance and amperage
• Voltage drop: Keep cable runs short to minimize voltage loss
• Safety disconnects: Install lockout/tagout switches
• Grounding: Proper grounding prevents electrical hazards

Fuel Logistics for Remote Sites

Fuel delivery and storage are critical considerations for remote mining operations.

Fuel Storage Requirements:

Fuel Delivery Considerations:

• Road access: Fuel trucks require all-weather access
• Delivery costs: Remote locations pay premium for delivered fuel
• Delivery scheduling: Plan deliveries to avoid running out
• Fuel quality: Use additives to prevent contamination and gelling
• Security: Protect fuel storage from theft and vandalism

Storage Tank Options:

• Portable tanks: 300-1,000 gallon plastic or steel tanks
• Skid tanks: 500-2,000 gallon units with integrated pumps
• Underground tanks: Permanent installations for large operations
• Fuel trailers: Portable 500-1,500 gallon trailers with pumps

Solar Power Supplement

While solar can't power wash plants directly, it can reduce generator loads for auxiliary equipment.

Solar Applications in Mining:

• Camp power: Lighting, communications, small appliances
• Water pumping: Low-flow pumps for remote water sources
• Communications: Radio repeaters, internet connections
• Security systems: Cameras, alarms, lighting
• Battery charging: Equipment batteries, tools, devices

Solar System Sizing:

• Camp power: 2-5 kW solar array with battery storage
• Water pumping: 1-3 kW depending on pumping requirements
• Communications: 500W-2kW for reliable operation
• Battery storage: 3-5 days backup power recommended

Generator Maintenance Basics

Proper maintenance reduces fuel consumption and prevents costly breakdowns.

Daily Maintenance:

• Check oil level: Verify oil level before startup
• Check coolant level: Ensure adequate cooling system fluid
• Inspect air filter: Clean or replace as needed in dusty conditions
• Check fuel level: Monitor fuel consumption and plan deliveries
• Listen for unusual noises: Address problems before they become failures

Weekly Maintenance:

• Clean air filter: Replace or clean depending on conditions
• Check belts and hoses: Look for cracks, fraying, or leaks
• Test safety systems: Verify shutdown systems function properly
• Check battery condition: Clean terminals and check electrolyte

Monthly Maintenance:

• Change engine oil: Use appropriate grade for operating conditions
• Replace fuel filters: Prevent fuel contamination issues
• Load bank test: Test generator at full load periodically
• Check electrical connections: Tighten loose connections

Frequently Asked Questions

Can I use a smaller generator to save on fuel costs?

Undersized generators cause voltage drops, motor overheating, and premature failure. The extra fuel cost of proper sizing is far less than repair and replacement costs from running underpowered equipment.

How does altitude affect my generator requirements?

Generators lose approximately 3-4% of their power output per 1,000 feet of elevation. At 5,000 feet elevation, you need 15-20% larger generator to maintain the same power output.

What about power factor and electrical load calculations?

Electric motors typically run at 0.8-0.9 power factor. This means a 100 HP motor (75 kW) actually requires about 85-95 kVA from the generator. Always account for power factor when sizing generators.

Should I run the generator at full load for fuel efficiency?

Generators are most fuel-efficient at 70-80% load. Running consistently above 90% load reduces engine life, while running below 50% load causes carbon buildup and poor fuel economy.

How often should I change generator oil in dusty mining conditions?

Dusty conditions require more frequent oil changes—typically every 100-150 hours instead of standard 250-hour intervals. Monitor oil condition and change when it becomes contaminated or breaks down.