30A into a 12V discharged battery is 360W. You have 400W of panels, but that's fine because they'll rarely deliver more than 360W. Even if they do, the MPPT will ignore power over what it wants, will limit its output to 30A. A 40A fuse or breaker would be good between battery and charge controller.
Can You charge a 12-volt battery with a 36-volt solar panel?
This article will teach you how to convert 36v solar panels to 18v solar panels to charge a 12-volt battery. When converting your batteries, make sure that the battery's voltage is higher than what you are trying to charge; we recommend charging 12 volts with a 24-volt panel and 18 volts with a 36-volt panel.
What happens if you convert 36V solar panels to 18V?
Keep in mind that the voltage drop over a diode is about 1.4 volts, so if you convert from 36 volts to 18 volts, there will be a loss of about 5.2 volts per panel. What are the advantages and disadvantages of converting 36v solar panels to 18v?
Should I use 24V or 48V batteries for my solar system?
Most solar power systems would be better off jumping up to 48V batteries, rather than being limited by 24V batteries. If you're building an off-grid system that requires a little more power than you can achieve with 12V batteries, but not an overly huge output, a 24V system could fit the bill.
Can You charge two 12V batteries at once?
You could use two 18-volt panels or one 36-volt panel in series with an 18-volt if you only want to charge one 12v battery at once. To charge two 12v batteries in parallel, you would need a 24-volt panel. What is the difference between 36v and 18v solar panels? The main difference is simply voltage.
In many cases, 24V batteries can be used for medium-sized RV setups, small off-grid cabins, or basic backyard solar panel setups. : More efficient than 12V for medium power needs and requires less wiring bulk than a 12V setup at equivalent wattage. : Fairly limited scalability and slightly awkward for larger applications.
What is the best battery for a small Solar System?
For example, EG4's 48V PowerPro Wall Mount Battery, with its 14.3kWh capacity, is one of the many efficient, all-in-one options out there that can be used for medium-sized systems, but still allows you to upgrade to a larger system in the future by adding more solar panels to your array.