Quick Answer
To connect solar panels in series, use a maximum of 4 panels in a string, with a total voltage of 24V, 36V, or 48V. This allows for efficient charging of a lithium battery and reduces voltage stress on the charge controller.
Choosing the Right Panel Configuration
When connecting solar panels in series, it’s essential to consider the total voltage and current requirements. A common configuration is to use 4-6 panels in series, but this can be excessive for a typical van life setup. A more practical approach is to use 2-4 panels in series, which provides a balanced voltage and current output. For example, using 4 x 12V panels in series will result in a total voltage of 48V, ideal for a lithium battery.
Maximizing Efficiency with Charge Controller Selection
To optimize solar panel performance, choose a charge controller that matches the total voltage and current output of your panel string. A 40A charge controller is suitable for a 24V or 48V system with 2-4 panels in series. When selecting a charge controller, consider the maximum power point tracking (MPPT) feature, which ensures efficient charging and extends the lifespan of your solar panels.
Wiring Techniques for Safe and Reliable Connections
When wiring solar panels in series, use heavy-gauge wire (10AWG or 6mm) to minimize voltage drop and ensure reliable connections. Connect the positive terminal of one panel to the negative terminal of the next, and use a fuse or circuit breaker to protect the panel string from overcurrent. Use electrical tape or heat shrink to secure connections and prevent water ingress.
Find more answers
Browse the full Q&A library by topic, or jump back to the topic this question belongs to.