75V 15a 12/24v Solar Charge Controller (Bluetooth) - Amazon

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We believe this is currently the best value 75v 15a 12/24v solar charge controller on Amazon.

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This is one of the highest quality and most recommended brands from our customers. You know the old saying, "you get what you pay for". This truly is a good value product.

Features:

Up to 75v solar input.
Up to 15a battery charging output
For charging 12/24v batteries

#1 FAQ - How many watts of solar panels can I have connected to this?

Answer: If you are charging a 12.8v lifepo4 battery at 14.6v multiply 14.6v by 15a. That would be 219w max solar input. 2x 100w 12v solar panels in series would work. Or for charging 25.6v lifepo4 batteries at 29.2v you could have up to 438w of solar panels. 4x 100w solar panels in series would work. Or of course you can use higher watt solar panels. Just keep the solar open circuit voltage input under 75v. You can always parallel solar panels to keep the voltage under. Volts x amps = watts. Always make sure your solar input voltage stays below 75v and amps are under 15a. Also make sure your battery can handle up to 15a continuous charge rate. We recommend using a 15a in line fuse as an added layer of protection between the charge controller and battery.