Remote industrial sites across Australia’s Pilbara and Goldfields regions face a persistent challenge: maximising solar energy production during extended operational hours while managing the harsh logistics of installation in isolated locations. Traditional north-facing solar arrays deliver peak output during midday hours, yet many mining operations, processing facilities, and remote industrial sites require consistent power from dawn through dusk.
East-west solar mounting systems address this operational reality by orienting panels to capture morning and afternoon sunlight, extending productive generation hours and reducing strain on battery storage or diesel backup systems. Solar generation timing optimization becomes critical for operations requiring consistent power across extended hours. When combined with modular deployment technology like CDI Energy‘s Rapid Solar Module (RSM3), these systems deliver both operational advantages and dramatically reduced installation timeframes – a critical factor when mobilising crews to remote sites where every day on-site represents substantial cost.
Understanding East-West Solar Mounting Configuration
East-west solar mounting positions panels in opposing directions along a single horizontal axis, with half facing east and half facing west. This configuration produces a distinctly different generation profile compared to traditional north-facing arrays.
North-facing systems (optimal for Australia’s southern hemisphere location) generate a pronounced midday peak, with output declining sharply in morning and afternoon hours. East-west configurations produce a bi-modal generation curve with two distinct peaks – one in the morning as east-facing panels capture rising sun, and another in the afternoon from west-facing panels. This solar generation timing optimization provides operational advantages for mining facilities where dawn-through-dusk power is critical. The midday output sits lower than north-facing equivalents, but the extended generation window often proves more valuable for industrial applications.
For a 1MW system in the Pilbara, north-facing orientation might generate 85% of daily energy between 9am and 3pm. The same system in east-west configuration distributes generation more evenly, with 40% produced before 11am and 40% after 2pm. This extended generation window reduces the depth of discharge on battery systems and minimises diesel generator runtime during shoulder hours when fuel efficiency drops.
The total annual energy from east-west mounting typically ranges from 85-92% of north-facing equivalent, depending on latitude and specific site conditions. This reduction in total yield becomes acceptable when operational requirements prioritise extended generation hours over peak capacity.
Operational Advantages for Remote Industrial Applications
Remote industrial sites operate under different constraints than grid-connected commercial installations. Power demand often extends from pre-dawn equipment startup through evening shift changes, creating a generation requirement that spans 12-14 hours daily.
East-west solar mounting aligns generation profile with this extended operational window. Morning east-facing generation supports equipment startup and day shift commencement without immediately drawing battery reserves. Afternoon west-facing generation continues through shift changes and evening operations, reducing the evening diesel load that typically represents the least efficient generator operation.
For hybrid energy systems integrating solar with existing diesel infrastructure, this extended generation window translates to measurable diesel offset improvements. A Goldfields mining operation implementing east-west mounting achieved 78% diesel offset compared to 71% with equivalent north-facing capacity, despite 8% lower total solar generation. The improved temporal alignment between generation and load delivered superior fuel savings.
Battery storage systems experience reduced cycling depth with east-west configurations. Rather than rapidly charging during midday peak then discharging through extended evening hours, batteries charge gradually throughout the day and discharge less deeply overnight. This gentler cycling pattern extends battery lifespan – a critical consideration given replacement costs and logistics for remote installations.
RSM3 Technology: Modular Deployment Advantages
CDI Energy’s Rapid Solar Module represents a ground-mount solar solution engineered specifically for remote deployment challenges. The pre-assembled, containerised design eliminates extensive on-site construction, reducing installation timeframes from weeks to days.
Each RSM3 unit arrives as a complete system – panels pre-mounted on racking, electrical connections tested, and structural components verified. Site preparation requirements reduce to foundation installation and module positioning. For east-west configurations, modules orient along the horizontal axis with panels pre-angled in opposing directions.
A 500kW installation using traditional ground-mount systems typically requires 4-6 weeks on-site with crews of 8-12 personnel. Equivalent capacity deployed through modular solar systems reduces this to 7-10 days with crews of 4-6. For remote sites where accommodation, catering, and transport represent substantial costs, this time reduction delivers immediate project savings.
The modular approach also enables staged deployment aligned with operational expansion. A remote processing facility can install initial capacity to offset baseline loads, then add modules as operations scale – without redesigning the entire system or repeating mobilisation logistics.
Installation Time Reduction: Quantifying the Advantage
Remote site mobilisation involves substantial logistics beyond equipment delivery. Crew accommodation, site access permits, safety inductions, equipment transport, and demobilisation all contribute to project timelines and costs.
Traditional solar installations require multiple site visits: initial site survey, foundation installation, racking delivery and assembly, panel delivery and mounting, electrical integration, and commissioning. Each visit involves full mobilisation logistics. Module-based systems consolidate these phases, with foundation work and module delivery representing the primary site activities.
A 1MW installation at a Pilbara mining site using conventional methods documented the following timeline:
- Site preparation and foundation installation: 8 days
- Racking delivery and assembly: 12 days
- Panel delivery and mounting: 14 days
- Electrical integration and testing: 6 days
- Total on-site duration: 40 days
Equivalent capacity using RSM3 modules completed in 15 days total – a 62% reduction in on-site duration. With daily site costs (accommodation, catering, supervision, equipment hire) averaging $8,500, the time reduction delivered $212,500 in direct cost savings before considering the earlier operational date and accelerated return on investment.
East-west configurations using modular systems maintain this installation advantage while simplifying panel orientation. Rather than calculating and setting individual panel angles, modules arrive pre-configured for east-west mounting, requiring only horizontal positioning along the designated axis.
System Design Considerations for East-West Configuration
Implementing east-west solar mounting requires specific design considerations beyond simple panel reorientation. String configuration, inverter selection, and site layout all influence system performance and installation efficiency.
Panel strings in east-west systems experience asymmetric generation throughout the day. East-facing strings generate morning peak while west-facing strings remain at lower output, then patterns reverse in afternoon. This requires inverter architecture that accommodates uneven input across multiple maximum power point tracking (MPPT) channels.
Modern hybrid inverters manage this through independent MPPT optimisation for each string group. East and west-facing strings connect to separate MPPT inputs, allowing the inverter to extract optimal power from each orientation regardless of the other’s current state. This prevents the common issue where mixed-orientation strings on single MPPT inputs compromise overall system performance.
Ground coverage ratio (GCR) – the percentage of land area covered by panels – increases with east-west mounting compared to north-facing tilted arrays. East-west systems typically mount at lower tilt angles (10-15 degrees) versus north-facing optimal tilt (20-25 degrees for Pilbara latitudes), reducing the north-south spacing required between rows. This higher GCR delivers more capacity per land area – valuable for sites with limited suitable terrain.
A 1MW system in north-facing configuration at 22-degree tilt requires approximately 2.8 hectares including access spacing. The same capacity in east-west configuration at 12-degree tilt occupies 2.2 hectares – a 21% reduction in land requirement. For constrained sites or locations where land clearing represents environmental or cost concerns, this density advantage proves significant.
Performance Optimisation Through System Integration
East-west solar mounting delivers maximum value when integrated with appropriately sized energy storage and control systems that capitalise on the extended generation window.
Battery storage sizing for east-west systems differs from north-facing equivalents. The more distributed generation profile reduces peak charge rates, allowing smaller inverter capacity for equivalent battery size. However, the extended generation window enables smaller battery capacity for equivalent overnight autonomy, as evening generation continues later and morning generation begins earlier.
A remote facility with 400kW average load and 8-hour overnight autonomy traditionally requires 3,200kWh battery capacity with north-facing solar. East-west configuration extends evening generation by 90 minutes and advances morning generation by 75 minutes, effectively reducing overnight duration to 6.25 hours. This allows 2,500kWh battery capacity for equivalent autonomy – a 22% reduction in battery investment.
Control system sophistication directly influences east-west system value. Basic systems simply accept available solar generation and manage battery state of charge. Advanced systems perform solar generation timing optimization by forecasting generation based on time of day and weather conditions, pre-positioning battery charge levels and diesel generator dispatch to optimise fuel consumption and battery cycling.
CDI Energy’s stand-alone power systems integrate predictive control algorithms that recognise east-west generation patterns and adjust battery management accordingly. Morning forecasts anticipating strong east-facing generation may defer diesel startup, allowing batteries to discharge slightly deeper with confidence that solar charging begins within 30-45 minutes. This operational intelligence compounds the fuel savings inherent in extended generation windows.
Practical Performance: Case Application
A Goldfields gold processing facility implemented a 750kW east-west RSM3 system to offset diesel generation for mill operations running 18 hours daily. The site previously operated three 500kW diesel generators in rotation, consuming approximately 2,800 litres daily at an annual fuel cost of $1.68 million.
System design incorporated 750kW solar capacity in east-west configuration with 1,200kWh battery storage. The east-west orientation was selected specifically for solar generation timing optimization aligned with the facility’s 5am to 11pm operational window, minimising battery depth of discharge and diesel runtime during inefficient partial-load operation.
Performance data from the first 12 months demonstrated:
- Total solar generation: 1,847 MWh annually
- Diesel fuel consumption reduced to 890 litres daily (68% reduction)
- Annual fuel cost reduced to $534,000 (saving $1.146 million annually)
- Battery cycling averaged 0.73 cycles daily versus 1.1 cycles projected for north-facing equivalent
- Diesel generator runtime reduced from 18 hours daily to 4.2 hours daily
The extended generation window proved critical to achieving 68% diesel offset. Morning east-facing generation commenced at 6:15am (local time), supporting mill startup without diesel operation. Afternoon west-facing generation continued until 6:45pm, covering the evening shift change and early evening operations. This alignment reduced the diesel-dependent period to late evening through early morning hours when mill load decreased to maintenance levels.
Installation completed in 11 days including foundation work, module positioning, and electrical integration. The rapid deployment minimised operational disruption and avoided the extended construction presence that would have complicated site safety management and accommodation logistics.
Economic Analysis: Total Cost of Ownership
East-west solar mounting with modular deployment delivers economic advantages across multiple cost categories beyond simple fuel savings.
Installation cost reduction stems primarily from compressed on-site duration. Remote site daily costs – accommodation, catering, site supervision, equipment hire, and safety management – typically represent 25-35% of total installation cost. Reducing on-site duration from 40 days to 15 days eliminates $212,500 in these costs for a 1MW system, reducing total installed cost by approximately 18-22%.
Operational cost advantages accrue from improved diesel offset and extended battery life. The 68% diesel offset achieved in the Goldfields case study compared to 71% with north-facing configuration might suggest marginal advantage. However, the reduced battery cycling – 0.73 cycles daily versus 1.1 cycles – extends projected battery lifespan from 11 years to 16 years. With battery replacement costs of $180,000 for the 1,200kWh system, this lifecycle extension represents $108,000 in deferred capital expense.
Maintenance requirements decrease with modular solar systems. Pre-assembled modules undergo factory testing and quality verification, reducing field commissioning issues. Electrical connections use standardised interfaces rather than field-terminated cables, minimising connection failures. Panel cleaning and inspection access benefits from the lower tilt angles typical of east-west mounting, reducing maintenance duration and safety equipment requirements.
Total cost of ownership analysis over 20-year system life for the 750kW Goldfields installation calculated:
- Capital cost: $1.89 million (including installation, batteries, controls)
- Fuel savings: $22.92 million over 20 years (assuming 3% annual diesel price escalation)
- Maintenance cost reduction: $340,000 versus diesel-only operation
- Battery replacement savings: $108,000 from extended cycling life
- Net present value (7% discount rate): $8.67 million
- Simple payback: 1.65 years
These economics prove compelling for remote industrial operations where diesel fuel represents substantial ongoing expenditure and renewable integration offers both cost reduction and emissions improvement.
Implementation Considerations for Remote Sites
Successfully implementing east-west solar mounting in remote locations requires attention to site-specific factors beyond standard system design.
Site access and terrain assessment determine foundation requirements and module positioning. Remote locations often feature rocky substrates requiring different foundation approaches than sandy or clay soils. RSM3 modules accommodate various foundation types – driven piles, helical anchors, or concrete pads – providing flexibility for diverse geological conditions.
Environmental conditions including wind loading, dust accumulation, and temperature extremes influence system specification. Pilbara and Goldfields sites experience cyclonic winds requiring engineered wind loading calculations. The lower profile of east-west mounting at 10-15 degree tilt reduces wind loading compared to steeper north-facing arrays, potentially reducing foundation requirements and improving system resilience.
The higher ground coverage ratio achieved through east-west mounting also affects dust accumulation patterns across all solar installations in remote industrial areas, but east-west configurations experience different soiling patterns. The bi-facial nature of some east-west installations (panels capturing reflected light from ground surfaces) means rear-side soiling can impact performance. However, the lower tilt angles facilitate rain-based natural cleaning more effectively than steep north-facing arrays where dust tends to accumulate along lower panel edges.
Grid integration – or lack thereof – determines control system requirements. True off-grid power systems require sophisticated load management and generation forecasting. Sites with grid connection but seeking maximum self-consumption benefit from export limiting and time-of-use optimisation. The extended generation window of east-west mounting provides more opportunities for load shifting and diesel displacement across operational hours.
Regulatory compliance varies by location and application. Mining sites require electrical installations to meet specific safety standards including hazardous area classifications near fuel storage and processing areas. Remote telecommunications sites follow different standards emphasising reliability and remote monitoring. Clean Energy Council accreditation ensures installations meet Australian Standards regardless of location remoteness.
Future Considerations: Scaling and System Evolution
East-west solar mounting with modular deployment provides scalability advantages as site operations evolve and power requirements change.
Capacity expansion involves adding modules while maintaining the ground coverage ratio efficiency that makes east-west mounting attractive. A site initially installing 500kW capacity can add 250kW modules as operations expand, maintaining consistent system architecture and control integration. This staged approach aligns capital expenditure with operational growth rather than requiring upfront investment for projected future capacity.
Battery storage expansion follows similar modular principles. Initial installations may incorporate battery capacity sized for immediate diesel offset targets, with expansion capability as diesel prices increase or emissions reduction targets tighten. The extended generation window of east-west mounting means added battery capacity delivers proportionally greater diesel offset by capturing more shoulder-hour generation.
Emerging technologies including bifacial panels and advanced inverter controls will enhance east-west system performance. Bifacial panels capture reflected light from ground surfaces – particularly valuable in east-west configurations where inter-row spacing allows ground reflection to reach panel rear surfaces. Current bifacial technology delivers 5-12% additional generation in east-west configurations compared to monofacial equivalents.
Advanced inverter controls incorporating weather forecasting and machine learning optimisation will extract additional value from east-west generation profiles. Systems that learn site-specific load patterns and generation characteristics can optimise battery dispatch and diesel generator scheduling with increasing precision over time.
Conclusion
East-west solar mounting delivers operational advantages for remote industrial applications where extended generation windows align with operational requirements spanning dawn through dusk. The bi-modal generation profile reduces battery cycling, improves diesel offset during inefficient shoulder hours, and provides more consistent power contribution across operational periods.
When implemented through modular deployment technology like RSM3, these operational advantages combine with dramatic installation time reductions – compressing on-site construction from weeks to days and eliminating substantial mobilisation costs. For remote sites where every on-site day represents significant expense, this installation efficiency delivers immediate project savings while accelerating return on investment through earlier operational dates.
The economic case for east-west mounting strengthens in applications prioritising diesel offset over maximum annual generation. Sites with 12+ hour daily operations, high diesel costs, and constrained battery budgets find particular value in generation profiles that distribute output across morning and afternoon periods rather than concentrating generation during midday peaks.
Remote industrial operations evaluating renewable integration should assess whether operational requirements align with east-west mounting advantages. Sites with 12+ hour daily operations, existing diesel infrastructure, and logistics challenges favouring rapid deployment represent ideal applications for this approach.
CDI Energy has deployed over 15MW of solar capacity across remote Australian sites since 2010, with increasing adoption of east-west configurations for applications where extended generation windows deliver superior operational outcomes. The combination of proven RSM3 technology with optimised mounting orientation provides remote sites with both immediate installation advantages and long-term operational value.
For facilities evaluating solar integration options, the choice between north-facing and east-west mounting depends on specific operational patterns, existing infrastructure, and performance priorities. Detailed feasibility assessment examining load profiles, existing generation assets, and site constraints determines optimal configuration. Get in touch with CDI Energy to discuss site-specific requirements and evaluate whether east-west solar mounting with modular deployment delivers advantages for particular operational circumstances.