I've recently started designing a solar system for my camping trailer and I have some questions about MPPT (Maximum Power Point Tracking) charge controllers. I'm aiming for at least 800Ah at 12V, which translates to around 3200W of solar power. Since typical MPPTs are smaller than what I need, I'm wondering if it's standard practice to use several MPPTs to connect multiple solar panels. I'm also toying with the idea of switching to a 48V system to take advantage of larger residential panels and maybe just use one MPPT instead. What are your thoughts on this? Is using multiple MPPTs a common approach or is there a better and more economical way to generate up to 10kWh per day?
3 Answers
I wouldn’t automatically assume you need multiple MPPTs unless you have a unique setup. You can absolutely go with larger panels and a single MPPT with a 48V system. In fact, that’s often a more efficient solution since a higher voltage means less current and lower losses. Just be mindful of your specific power needs and set up accordingly!
Absolutely, you can use multiple MPPTs, especially if your solar panels might be facing different directions or if there's some shading at different times of the day. For a camper, it makes sense. Just make sure you have enough space for that much solar—3200W is a lot for a trailer!
Yes, it's definitely common to use multiple MPPTs if needed. Remember, batteries and solar panels don’t have fixed dependencies; it's your load that determines everything. You mentioned considering a 12V system, but I’d recommend looking into a 48V setup. A single MPPT can easily handle 3200W at 48V, and it simplifies everything. Plus, bigger residential panels are a great way to go when you switch to a higher voltage system!
Thanks for the tips! Switching to 48V sounds like it could really save me money and keep things simpler.
Got it! I want to balance efficiency and cost, so I’ll definitely explore the 48V option further.