Series Wiring Explained
In a series connection, panels are wired positive-to-negative in a chain, adding their voltages together while the current (amps) stays the same as a single panel. For example, four 12V panels in series produce 48V at the same amperage as one panel. Series wiring is common when you need higher voltage to match your inverter or charge controller's input range.
Parallel Wiring Explained
In a parallel connection, panels are wired positive-to-positive and negative-to-negative, keeping the voltage the same as a single panel while adding the currents together. Four 12V panels in parallel still produce 12V, but with four times the current. Parallel wiring is often used with MPPT charge controllers that can handle higher current, or when panels face different directions and receive different amounts of sun.
Series-Parallel (Combined) Wiring
Larger systems often combine both methods: panels are wired in series to form strings that reach the desired voltage, and multiple strings are then wired in parallel to increase current and total power. This is the standard approach for most home solar installations above a few hundred watts.
Key Safety and Sizing Tips
- Never exceed your charge controller or inverter's maximum input voltage or current rating.
- Use panels of the same wattage and voltage within a series string to avoid mismatch losses.
- Use appropriately rated solar cables and MC4 connectors.
- Always install a suitable circuit breaker or fuse on each string for protection.
- Double check polarity before connecting to your charge controller to avoid damaging it.
