I currently have a 100 watt solar panel, charging a 12 V, 6 Ah lead acid battery using a generic solar charge controller.
I am looking to connect a 12 V, 6 A Peltier unit, as well as a Raspberry Pi, to turn the Peltier on/off, during specific times.
I am currently running the Raspberry Pi Pico off this battery, using an LM7805 voltage regulator. I plan to use a IRFZ44N to control the Peltier device using PWM, to regulate it to a specific current ~3 A.
My main questions are around the power limitations, and if I will be able run the Peltier unit for the needed time (for example, 10 minutes every hour, through the night, ~1.5 hours.)
What is the optimal way to only draw 3 A from the battery to the Peltier, without losing too much power? Is the MOSFET the best solution? Maybe a switching-regulator to control the current draw, and MOSFET to control the power on/off?