IDA Tools
Solar Array Sizer
Calculate solar array size based on panel specs and system voltage.
Inputs
Outputs
System Diagram
System Schematic
Details
This tool helps determine the maximum number of solar panels that can be connected in a series string without exceeding the voltage limits of your inverter or charge controller. It also provides an example of total array voltage and current.
1. Safety First: The primary constraint is the maximum input voltage of the inverter/controller. Exceeding this can damage the equipment. 2. NEC Compliance: The National Electrical Code requires a safety factor (typically 1.25) to account for increased voltage in cold weather (the "temperature coefficient" effect). 3. String Parallelism: When connecting multiple strings in parallel, each string must have the identical number of identical panels to avoid current backflow and potential damage.
Panels per String = Floor(Max System Voltage / (Panel Voc * Safety Factor)) Array Voc = Panels per String * Panel Voc Array Isc = Number of Strings * Panel Isc