Why Proper Wire Sizing Matters
Selecting properly sized wires for your solar energy system is critical for safety, efficiency, and code compliance. Undersized wires can cause significant voltage drops, energy losses, and dangerous overheating that may lead to fires.
Fire Safety
Prevents overheating and fire hazards from undersized conductors
Energy Efficiency
Minimizes voltage drop and power loss for maximum system performance
Code Compliance
Meets NEC standards and local electrical regulations
⚡ Wire Size Calculator
Enter your system parameters to calculate the required wire gauge
Calculation Results
Wire sizing recommendations based on your parameters
Ready to Calculate
Fill in the parameters and click “Calculate Wire Size” to see your results
Recommended Wire Size
Based on NEC standards
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Voltage Drop Analysis
✅
Within Limits
Calculated Drop
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Voltage at Load
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Wire Specifications
Current Capacity
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Resistance
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Temperature Rating
75°C (167°F)
Installation Type
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⚠️ Important Safety Notes
- Always verify calculations with local electrical codes
- Consider temperature derating factors for your installation
- Use appropriate overcurrent protection devices
- Consult a licensed electrician for final installation
Technical Information
🧮 Calculation Method
Voltage Drop Formula:
VD = 2 × K × I × L / CM
Where: VD = Voltage Drop, K = Resistivity Constant, I = Current, L = Length, CM = Circular Mils
Wire Sizing Criteria:
- Ampacity based on NEC Table 310.16
- Voltage drop calculations per NEC 210.19(A)
- Temperature correction factors applied
- Safety margins included
ℹ️ Wire Properties
Conductor Materials:
Copper
Higher conductivity, more expensive, easier to work with
Aluminum
Lower cost, larger size needed, requires special connectors
Installation Considerations:
- Ambient temperature affects ampacity
- Conduit fill requirements
- UV resistance for outdoor applications
- Moisture and chemical resistance