Year 3 Performance Analysis
Conservative estimates with system degradation included
📊 Annual Charging Requirements
WITH Solar Panel
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WITHOUT Solar Panel
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Seasonal Performance (Year 3)
Winter Net (Dec)
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Winter Gen
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Daily Load
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Battery Life (Dec)
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Engineering Breakdown (December - Worst Case)
| Parameter | Value | Notes |
|---|
Year 3 Degradation Model:
• Solar Panel: -10% output degradation (industry standard: 3-4%/year)
• Battery: -20% capacity loss (typical Li-ion aging at 2-3 years)
• Motor: +15% energy consumption (mechanical wear, lubrication loss)
Conservative Assumptions:
• Solar Data: NREL TMY3 Vertical Surface Irradiance (Seasonal Avg)
• Charge Controller: 90% efficiency (10% conversion loss)
• Battery Round-Trip: 93% efficiency (7% charge/discharge loss)
• Dirt Factor: 10% loss (vertical glass in urban environment)
• Motor Runtime: ~0.5 seconds per inch of HEIGHT (rolling time)
• Motor Torque/Current: Scales with AREA × FABRIC WEIGHT (load on roller)
• Motor Energy: Validated against SmartWings 600 cycle spec (2200mAh battery)
• Standby Current: 0.25-2.0mA avg (protocol dependent, includes sleep mode)
• Partial Shading: Non-linear loss model (bypass diode effects)
• System Voltage: 5.0V nominal (USB Standard)
Seasonal Analysis:
• Winter (Dec): Minimum sun, cold temperature penalty (-15%)
• Spring (Mar): Moderate sun, optimal temps
• Summer (Jun): Maximum sun, heat penalty (-8%)
• Fall (Sep): Good sun, optimal temps
Charging Calculation:
• System assumed dead when battery reaches 20% capacity (safety margin)
• WITH solar: Only charges needed when cumulative deficit exceeds usable capacity
• WITHOUT solar: Pure consumption-based calculation
• Solar Panel: -10% output degradation (industry standard: 3-4%/year)
• Battery: -20% capacity loss (typical Li-ion aging at 2-3 years)
• Motor: +15% energy consumption (mechanical wear, lubrication loss)
Conservative Assumptions:
• Solar Data: NREL TMY3 Vertical Surface Irradiance (Seasonal Avg)
• Charge Controller: 90% efficiency (10% conversion loss)
• Battery Round-Trip: 93% efficiency (7% charge/discharge loss)
• Dirt Factor: 10% loss (vertical glass in urban environment)
• Motor Runtime: ~0.5 seconds per inch of HEIGHT (rolling time)
• Motor Torque/Current: Scales with AREA × FABRIC WEIGHT (load on roller)
• Motor Energy: Validated against SmartWings 600 cycle spec (2200mAh battery)
• Standby Current: 0.25-2.0mA avg (protocol dependent, includes sleep mode)
• Partial Shading: Non-linear loss model (bypass diode effects)
• System Voltage: 5.0V nominal (USB Standard)
Seasonal Analysis:
• Winter (Dec): Minimum sun, cold temperature penalty (-15%)
• Spring (Mar): Moderate sun, optimal temps
• Summer (Jun): Maximum sun, heat penalty (-8%)
• Fall (Sep): Good sun, optimal temps
Charging Calculation:
• System assumed dead when battery reaches 20% capacity (safety margin)
• WITH solar: Only charges needed when cumulative deficit exceeds usable capacity
• WITHOUT solar: Pure consumption-based calculation