Solar Panel String Configuration

Each string is connected into a separate input on the inverter.

Solar panel string configuration.

This would mean that when designing a system you could have between 8 and 12 panels in a series. A new day solar installer secures a microinverter to racking. Each string inverter has a range of voltages at which it can operate. In the configuration above each string can have a different numbers of panels and each string can face different directions.

When wiring module strings together which happens in series e g. Positive to negative voltage is increasing while current stays constant. When wiring multiple module strings together in parallel e g. Any more than that would exceed the maximum voltage the inverter could handle.

1 string per inverter input. For example this grid tied system contains 24 mission solar 360w panels and one sma sunny boy 7700w inverter. In a string inverter installation high voltage dc power from all panels in an array is routed into one inverter where it s converted to ac power. In most crystalline solar panels the open circuit voltage is around 40 volts.

Positive to positive and negative to negative current is increasing while voltage stays constant. String sizing describes the calculations we make to determine how many panels we should plug into one input for optimal efficiency. Most string inverters have an operational voltage window between 300 and 500 volts. String inverters and microinverters take very different approaches to converting dc power to usable ac power in solar projects.

Solaredge design voltage is 350 vdc so the design amps for the 20 panel string is 5100 350 14 6 a while the amps for the 19 panel string is 13 8 a. Inverters have a maximum string size an upper limit to the number of panels they can support for example you may have a system with two inverters supporting two strings of 10 panels each which comes together to make a 20 panel array. Each group of panels in series is called a string. In the solar industry.

This is typically referred to as stringing and each series of panels connected together is referred to as a string. Let s assume you are using conduit to make the connections between arrays and for the homerun to the inverter and it is mounted something between a 0 5 and 3 5 off the surface of the roof. In this article we ll be focusing on string inverter as opposed to microinverters.