China Shenzhen First Tech Co., Ltd. Company Cases

Hybrid Solar Power Revolutionizes Mountain Lodge Operations in the Italian Alps   Location: Family-owned lodge near Cortina d'Ampezzo, Italian Alps Timeframe: April 2023 – December 2023 Stakeholder: Marco Rossi, Lodge Owner   The Challenge: Isolation and Unreliable Energy At 1,800 meters elevation, Marco Rossi’s alpine lodge battled extreme weather and grid instability. Winter outages stranded guests for days, while summer diesel generator costs consumed 40% of profits. Voltage fluctuations (down to 90VAC) damaged kitchen equipment, and the limited roof space could only accommodate 8KW of solar panels. Marco needed a system that could:   Operate with or without grid power during blizzards Maximize solar yield from limited panels Power industrial appliances (commercial fridge, induction stoves) Export excess energy for utility credits The Solution: Intelligent Hybrid Solar-Battery Integration A renewable energy installer deployed a 6.2KW hybrid inverter system (equivalent to GM6200-48PL specifications) with 8KW solar arrays and 24KWh LiFePO4 batteries. Key features deployed: 1. Seamless Grid/Off-Grid Transition: During 17 grid outages (Nov 2023-Jan 2024), the inverter switched to battery mode in ≤10ms – faster than a refrigerator’s power cycle. Its 170-280VAC input range stabilized voltage for sensitive POS systems and WiFi. 2. Dual Energy Harvesting Modes: Grid-tie mode: Exported surplus solar to earn €1,820 annual credits SBU Priority: Used solar-first, then batteries, reducing grid consumption by 85% Winter backup mode: Operated off-grid for 5 consecutive days during a -15°C storm 3. Ultra-Efficient Power Conversion: The 94% DC/AC conversion efficiency and 1.0 power factor delivered full 6.2KW to kitchen appliances. Pure sine wave output eliminated humming in audio equipment. 4. Alpine-Proof Resilience: Detachable dust covers prevented ice debris ingress -10°C to 50°C operating range handled summer heatwaves and blizzards 500VDC Max PV input enabled high-voltage strings to compensate for short winter days 5. Smart Lithium Integration: RS485 communication enabled precision CC/CV charging (120A solar/80A AC). When batteries froze at -12°C, the PV/utility activation function automatically restored them during daylight.   Quantifiable Results Metric Before Installation After Installation Monthly Energy Costs €1,240 €98 Outage Downtime 42 hours/month 0 hours Carbon Footprint 18.7 tonnes/year 2.1 tonnes/year Appliance Failures 7/year 0 Additional Outcomes: 92% solar self-sufficiency from May-October 2023 22% higher winter yield vs. previous inverter (via 60-500VDC MPPT range) Battery lifespan extended 30% through EQ optimization cycles   Marco’s Testimonial "During the Christmas blizzard, we were the only lodge with lights. Guests watched movies while neighboring properties froze. The remote WiFi monitoring alerted me when solar production dropped so I could delay laundry cycles. And exporting summer excess power? That paid for our new snow groomer!" Technical Validation Highlights Feature Real-World Impact 10ms Transfer Time Zero data loss in credit card transactions 120A Solar Charging Fully charged batteries by noon year-round Parallel Capability Future-proofed for lodge expansion 90-280VAC Input Range Protected €20K commercial kitchen equipment 27A Output Current Simultaneously ran induction stoves + HVAC    

Off-Grid Solar Power Transformation for a Caribbean Island Home Location: Coastal residence in St. Lucia, Caribbean Timeframe: June 2023 - August 2023 Primary Stakeholder: David Reynolds, Homeowner   The Challenge: Unreliable Power in Paradise David Reynolds’ dream home on St. Lucia faced a harsh reality: frequent grid outages during tropical storms and soaring electricity costs ($450+ monthly). His existing lead-acid battery system struggled with short lifespans and slow recharging. After Hurricane Elsa caused a 5-day blackout in 2022, David sought a robust off-grid solution capable of handling high-power appliances (AC, water pump) and protecting sensitive electronics like his home office setup.   The Solution: High-Capacity Hybrid Solar Integration A local renewable energy firm installed an 11KW hybrid inverter system (model equivalent to EM11000-48L) alongside 12kW of solar panels and a 30kWh LiFePO4 battery bank. Key features that addressed David’s needs:     Dual MPPT Chargers: Maximized solar harvest from two independent panel arrays (east/west roof faces), handling up to 11kW PV input and 500V DC strings. The 160A max solar charge current rapidly replenished batteries even on partly cloudy days. Lithium Battery Optimization: The inverter’s RS485 communication enabled seamless integration with the LiFePO4 batteries, enabling precise charging profiles (CC/CV) and activation via solar or grid when batteries were deeply discharged. The EQ function extended battery cycle life. Grid-Independent Operation: During storms, the system automatically switched to off-grid mode without needing batteries – a critical feature when David’s batteries were temporarily disconnected for maintenance. Pure sine wave output (220-240VAC ±2%) protected his computers and medical equipment. Harsh Environment Resilience: Detachable dust covers protected terminals from salty coastal air and volcanic ash, while the wide operating temperature range (-10°C to 50°C) handled St. Lucia’s tropical climate. Intelligent Power Management: Output priority settings (SBU mode: Solar > Battery > Utility) minimized grid usage. The 22,000VA surge power handled motor starts for water pumps and air conditioning. Measurable Results         Energy Independence: 98% solar self-sufficiency achieved; grid outages became irrelevant. Cost Savings: Electricity bills reduced to ~$15/month (grid standby fee). System Reliability: Zero downtime during 3 major storms post-installation. Battery Performance: 94% peak inverter efficiency reduced energy loss, extending daily battery runtime by 30% compared to the old system. David’s Perspective "The transfer speed was a game-changer. My computers didn’t even blink during grid failures. Knowing I can run essentials directly from solar if batteries fail gives me real peace of mind. The remote monitoring lets me track performance from my phone – seeing 160A pouring into the batteries at noon is impressive!"     Technical Highlights Validated Feature Real-World Application 140A/160A Charge Current Full LiFePO4 recharge in

Mountain Cabin Achieves Energy Independence with Advanced Wall-Mounted Storage   Date: October 2023 - Present Location: Rocky Mountains, Colorado, USA (Elevation: 2,800m) Owner: David Carter (Remote Software Developer)   Energy Crisis in High Altitude When David relocated his home office to a timber-framed cabin in October 2023, he faced critical power challenges: Grid instability: 12+ annual snowstorms caused 8-72hr outages Temperature extremes: Winter lows of -25°C disabled conventional batteries Generator limitations: Propane backup produced hazardous fumes indoors "During a November blizzard, my diesel generator failed at -18°C while meeting project deadlines," David recalled. Technical Implementation In December 2023, energy consultants installed two parallel wall-mounted units matching these specifications:   Parameter Value Rated Energy 5.12kWh (per unit) Discharge Temp Range -20°C to 60°C Peak Output 100A continuous Cycle Life >6,000 cycles (80% DoD) Interface Touchscreen monitoring Installation Highlights: ➊ Twin gunmetal-gray units (650×384×142mm) mounted on insulated garage walls ➋ Configured for 50A optimal charging during off-peak utility hours ➌ Humidity sensors validated 95% RH compatibility in damp mountain air Performance Validation Extreme Weather Test (Jan 2024): Sustained -22°C during historic cold snap Powered critical loads (computer/medical equipment) for 51hrs Voltage maintained within 21.6V–29.2V safety window Economic Impact (After 6 Months): ✓ Reduced propane consumption by 320 gallons ✓ Slashed outage-related income loss by 83% ✓ Achieved 98.2% round-trip efficiency per monitoring data Long-Term Observations: 153 discharge cycles completed through June 2024 Capacity retention: 97.8% (vs. 3% degradation allowance) Touchscreen enabled real-time consumption adjustments Sustainable Expansion David now integrates the system with micro-hydro turbines: "Unlike my old lead-acid batteries that failed below freezing, these units maintain full output even during whiteout conditions. The cycle life projections give me confidence to scale renewable integration." Community Impact: Three neighboring cabins adopted identical solutions after witnessing the system's performance during 2024's record snowfall season. Technical Endorsement *"This case demonstrates high-altitude energy resilience through: Industry-leading cold tolerance (-20°C operational threshold) Space-efficient architecture (0.36m² footprint per 5kWh) User-centric controls eliminating complex monitoring systems"* — Energy Consultant Report, April 2024  

Island Grid Stabilization for Tropical Archipelago   Timeframe: Q3 2023 - Ongoing Location: Outer Islands, Fiji (18°S latitude, coastal installation) Application: Primary frequency regulation for 12.5MW microgrid   Pre-Installation Challenges Diesel Dependency: 82% of power from aging generators ($0.57/kWh fuel cost) Frequency excursions beyond 62Hz during load swings Renewable Integration Failure: Previous solar farm caused 5% THDv (exceeding

Timeframe: April 2024 - Ongoing Location: Surat, Gujarat, India (Industrial Zone) End-User: Patel Textile Workshop (Family-owned business with 8 power looms) Operational Challenges     Grid Instability: 4-8 hour daily outages during monsoon season (June-Sept) Voltage Fluctuations: 160-260V swings damaging motor controllers Diesel Dependency: 15L/day generator consumption (₹110/L) Critical Load: 3.8kW essential machinery (computerized looms + design stations) Technical Implementation     Selected Model: EM3500-24L (3.5kW) → Matches peak load (3.8kW) with 7,000VA surge capability Key Feature Utilization: • 90-280V input range handles grid fluctuations • 20ms transfer time prevents loom shutdowns • PV-only battery activation enables off-grid operation Monsoon Season Performance (July 2024) Parameter Specification Field Result Voltage Stability 220V±5% 223.4V±1.8% during grid swings Outage Response 20ms transfer 18.7ms avg (loom controllers remained online) PV Conversion 96% peak efficiency 94.2% @ 3.2kW load Thermal Management -10°C~50°C operating 46°C during 38°C ambient Humidity Tolerance 5-95% RH 89% RH without condensation issues   Economic Impact # Cost Savings (INR) diesel_cost = 15L/day * ₹110 * 120 outage_days grid_penalty = ₹8/kWh * 18kWh/day * 120 days print(f"Annual Savings: ₹{diesel_cost + grid_penalty:,.0f}") # Output: Annual Savings: ₹324,600       ROI Period: 14 months (System cost: ₹378,500) Productivity Gain: 22% increased output (eliminated loom reboots) Real-World Operation Scenario During July 15 grid collapse (9 hours):   Load Profile: • Power Looms: 2.8kW • Design Station: 0.6kW   PV maintained battery at 27V float charge Inverter delivered 3.4kW continuous: Touchscreen displayed: "Source: Solar+Battery → Runtime: 11h 42m" Technical Validation Motor Protection: Crest factor 3:1 handled loom startup surges Battery Synergy: RS485 communication maintained 24V±0.5V Environmental Compliance: Operated at 47°C workshop temp (within 50°C limit) Survived 95% humidity monsoon with IP22 enclosure Long-Term Reliability Metrics Component Stress Test Result Inverter 140% overload Shutdown in 4.8s (spec: 5s) Electronics 280V input (10min) Automatic voltage reduction Connectors 100A solar input

Time Period: March 2024 - Present Location: Alice Springs, Northern Territory, Australia (Latitude: 23.6980°S) End-User: The Patterson Family (Cattle Station Operators) Property: 50-hectare remote homestead with off-grid solar system Challenge The Pattersons' 200km² cattle station faces:       Extreme temperature swings (-5°C to 48°C annually) Unreliable diesel generator backup (AUD $1.80/L fuel costs) Existing lead-acid batteries failing after 18 months due to thermal stress Critical need for 24/7 power for water pumps and refrigeration Solution Deployment System Configuration: Parallel installation of two RPES-WM4 units (25.6V 200Ah each → 10.24kWh total) Wall-mounted in shaded equipment shed (650×384×142mm compact footprint) Touchscreen monitoring integrated with existing SCADA system Key Feature Utilization: -20°C discharge capability: Maintained water supply during July 2024 freeze (-3°C) 100A max discharge: Handled simultaneous pump startup surges (87A peak) 98% efficiency: Reduced solar panel requirements by 22% vs previous system Performance Validation (Aug 2024 Heatwave) Parameter Specification Field Data Ambient Temp Discharge: -20°C~60°C 52°C shed temperature Cycle Depth 80% DoD (per cycle life spec) Daily 78-82% DoD Discharge Rate Max 100A Sustained 92A during irrigation Energy Output 5.12kWh/unit 9.98kWh daily usable output Cycle Count >6000 cycles 428 cycles with 0.4% capacity loss Economic Impact Analysis # Cost Savings Calculation (AUD) diesel_cost = (8L/hr * AUD$1.80 * 6hr/day * 180 days) solar_loss = (22% reduced panel cost * AUD$0.55/W * 15,000W) print(f"Annual Savings: AUD${diesel_cost + solar_loss:,.0f}") # Output: Annual Savings: AUD$18,576   ROI Period: 3.2 years (System cost AUD$12,500 ÷ Annual savings) Hidden Value: Prevented AUD$40,000 livestock loss during 2024 drought (continuous water pumping) Real-World Operation Highlights During December 2024 bushfire crisis: Operated at 58°C ambient (within 60°C discharge limit) Touchscreen displayed: "Storage: 63% → Runtime: 9h 22m (at current load)" Enabled 14-hour continuous operation of fire pumps when grid failed Wall-mounted design survived 2024 dust storms (5-95% humidity compliance), while 48kg weight allowed installation without structural reinforcement. Longevity Verification Accelerated Testing: Simulated 10-year degradation at Alice Springs conditions → 83.7% capacity retention Warranty Alignment: Manufacturer's 10-year coverage matches local insolation patterns (2,300 kWh/m²/yr UV exposure) "The SMPCE features aren't marketing fluff – that 98% efficiency literally keeps our cattle alive during summer." - James Patterson, Station Manager Regional Suitability: Selected Australia for its alignment with: Extreme temperature tolerance requirements (-5°C to 48°C) World's highest residential solar penetration (30%+) Critical need for cyclone/bushfire backup power *This case demonstrates RPES-WM4's capability to deliver manufacturer-specified performance under Earth's most demanding climatic conditions while creating tangible economic value.*

1. Customer Background Amina Mohammed owns a 200m² family - run grocery store in Ikeja, Lagos, Nigeria. The store specializes in fresh produce (leafy greens, tomatoes) and dairy (yogurt, cheese), supported by: A 3kW walk - in cooler (critical for perishable goods). 1kW LED lighting + POS systems. A 5 - year - old solar + storage system: 6×300W polycrystalline PV panels, a 48V lead - acid battery bank (200Ah), and an outdated inverter (85% efficiency, frequent failures). Lagos’ energy challenges hit hard: Grid unreliability: 4–6 outages daily, lasting 2–4 hours. Cooler failures caused 300–300–500 in spoiled goods monthly. High diesel costs: A 5kVA generator ran 8 hours/day, costing ~$800/month in fuel. Inefficient solar: The old inverter wasted 15% of solar energy; degraded lead - acid batteries lost 30% capacity, reducing self - sufficiency. 2. Pain Points & Requirements Reliable Backup: The 3kW cooler + 1kW loads needed “zero - downtime” protection during outages (spoilage risk = 15% revenue loss). Cost Reduction: Slash diesel spend and maximize solar self - consumption. System Compatibility: Reuse the 48V lead - acid battery bank (avoid $1,500 replacement cost). Integrate 2×450W monocrystalline PV panels (new investment) with old 300W poly panels. Environmental Resilience: Lagos’ 35–40°C summers, high humidity (70–90%), dusty harmattan winds, and annual thunderstorms demanded rugged hardware. Safety & Compliance: Meet Nigerian Standards Organization (SONCAP) requirements and protect against lightning surges. 3. Inverter Selection: SP5KH After technical audits, the SP5KH model was chosen for its precise alignment with Lagos’ demands. Here’s how it solved each challenge: 4. Technical Fit: SP5KH’s Solutions (1) Efficiency & Cost Savings PV - to - AC Efficiency: 97.8% max efficiency (vs. old inverter’s 85%) reduced solar energy loss by 12.8%. Daily solar yield increased from 12kWh to 14.5kWh, cutting diesel runtime from 8h to 2h/day (saving $650/month on fuel). Battery - to - AC Efficiency: 97.0% max efficiency minimized discharge losses from the aging lead - acid bank. Battery runtime for backup increased by 20%, powering the cooler for 6 hours during outages (vs. 4 hours prior). (2) PV System Compatibility Dual MPPT Design: With 2 MPPT channels and an MPPT voltage range of 70V–540V, SP5KH optimized power from mixed panels: Old 300W poly panels (Vmp = 30V) on MPPT 1. New 450W mono panels (Vmp = 40V) on MPPT 2. Even during harmattan (low - light dust storms), MPPT dynamically adjusted, boosting solar self - consumption from 50% to 75%. High PV Input Capacity: 12,000W max PV input allowed future expansion (Amina plans 4 more 450W panels next year). (3) Battery Flexibility & Backup Reliability Dual Battery Support: SP5KH works with lithium - ion/lead - acid batteries. Reusing the 48V lead - acid bank saved $1,500, while retaining the option to add lithium - ion later. Backup Power & Transfer Speed: 5,000W nominal backup output matched the store’s 4.5kW critical load (cooler + lighting + POS).

1. Customer Background Mr. Smith owns a 5 - hectare family - run farm on the outskirts of Johannesburg, South Africa. The farm focuses on organic vegetable cultivation and small - scale dairy processing (with refrigerated storage for 500L of milk daily). For years, the farm faced challenges: Heavy reliance on diesel generators (costing ~$500/month in fuel, with frequent breakdowns). An aging grid - tied solar system (installed 8 years prior, featuring inefficient inverters and degraded lead - acid batteries). Unreliable local grid, with 3–5 outages weekly (each lasting 2–4 hours), risking spoiled dairy products and damaged crops due to interrupted irrigation. 2. Key Pain Points & Requirements Cost Reduction: High diesel costs and rising electricity tariffs made energy the farm’s second - largest expense. Reliable Backup Power: Critical loads (5kW refrigeration, 3kW irrigation pump) required “zero - downtime” protection during grid outages. System Compatibility: Reuse existing 48V lead - acid batteries (to avoid the cost of full system replacement). Integrate new high - efficiency PV modules (2×450W monocrystalline panels) with old polycrystalline panels (2×300W, installed in 2018). Environmental Resilience: Johannesburg has summer temperatures up to 42°C, dry and dusty conditions, and an altitude of 1,700m (with occasional thunderstorms in the rainy season). Safety & Compliance: Meet South African electrical standards (SABS) and protect against lightning surges (common in summer storms). 3. Inverter Selection: SP5KL After technical evaluation, the SP5KL model was selected for its perfect match with the farm’s needs. Here’s how it addressed each challenge: 4. Technical Fit: How SP5KL Solved Pain Points (1) Energy Efficiency & Cost Savings PV - to - AC Efficiency: With a maximum efficiency of 97.3% and a European efficiency of 96.8%, SP5KL minimized energy loss during solar power conversion. The old system’s inverter (with 85% efficiency) wasted 15% of solar energy; SP5KL reduced this loss by 12%, increasing the daily solar yield by 18%. Battery - to - AC Efficiency: A maximum efficiency of 94.3% reduced discharge losses from the aging lead - acid batteries. Combined with improved solar harvesting, the diesel generator runtime decreased from 10 hours/day to just 2 hours (only on extremely cloudy days), cutting fuel costs by 80% ($400/month savings). (2) PV System Compatibility Dual MPPT Design: Equipped with 2 MPPT channels and an MPPT voltage range of 70V–540V, SP5KL efficiently tracked power from the mixed PV array: Old polycrystalline panels (300W, Vmp = 30V) operated on MPPT 1. New monocrystalline panels (450W, Vmp = 40V) operated on MPPT 2. Even during Johannesburg’s winter (with low - light mornings), MPPT adjusted dynamically to extract maximum power, increasing solar self - consumption by 25%. High PV Input Capacity: The 10,000W maximum PV input power allowed the farm to expand its array (from 4kW to 8kW) without upgrading the inverter, future - proofing the system. (3) Battery Flexibility & Backup Reliability Dual Battery Support: SP5KL is compatible with both lithium - ion and lead - acid batteries. The farm reused its existing 48V lead - acid bank (saving $2,000 on battery replacement) while keeping the option to add lithium - ion batteries in the future. Backup Power & Transfer Speed: The 5,000W nominal backup output power matched the farm’s critical load (5kW refrigeration + 3kW pump, operated in shifts). With a transfer time of