I'm currently using four 100W solar panels in series, which gives me a voltage of just over 80V. My charge controller has a maximum voltage limit of 100V. If I add a fifth panel, I'll exceed the voltage limit, right? Here's some specification data for the panels: nominal power is 100W with a maximum power voltage of 18.56V and an open-circuit voltage of 21.76V. Would really appreciate any advice on this!
3 Answers
Just a heads up, temperature can make a big difference in PV voltage. Depending on where you live, the voltage could increase in colder weather. You might lean towards just three panels in series to stay within the safe zone for your charge controller, especially if you expect cold mornings!
You're on the right track with your calculations! The open-circuit voltage (VoC) is indeed crucial here. In colder temperatures, your panels could reach a higher voltage than expected. If you want to be safe, consider running three panels in series instead, or switch to a controller that can handle a higher voltage if you want to add more panels later!
Thanks, that makes sense! I'll stick to three panels for now.
Yep, adding that fifth panel would definitely push you over the voltage limit of your charge controller. A better option might be to rewire your setup to 3s2p and only add two additional panels. This keeps you within safe limits and optimizes your output!
Exactly! Always better to err on the side of caution with these setups.