Solar Panel String Calculator
Calculate optimal panels per string with winter derating & voltage limits
How to Size Your Solar String Correctly
What is Winter Derating in Solar?
Winter derating accounts for reduced solar irradiance and temperature effects during colder months. Panels typically produce 10-25% less than STC ratings in winter conditions.
Why Does System Efficiency Matter?
System efficiency covers losses from inverters, wiring, soiling, and mismatch. Most residential systems operate at 95-98% efficiency under optimal conditions.
Understanding Max DC Voltage Limits
Every inverter has a maximum DC input voltage. Exceeding this can cause permanent damage. Always check your inverter datasheet before designing strings.
What is Panel Voc and Temperature Coefficient?
Voc (Open Circuit Voltage) increases in cold weather. A standard 49.5V panel can reach 55V+ on cold sunny mornings, pushing string voltages higher than expected.
How to Calculate Panels Per String
Divide inverter Max DC Voltage by panel Voc to get maximum panels. Then verify against power requirements and winter derating to ensure performance.
State-Based Solar Performance Factors
Solar irradiance varies by location. TAS and VIC need higher derating than QLD or WA. Always factor local climate when calculating array sizes.
Common String Sizing Mistakes to Avoid
Don't ignore cold-weather voltage rise. Don't oversize beyond MPPT range. Don't forget to check minimum startup voltage for early morning generation.
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