I'm currently working on long-term remote-sensing & data-acquisition. Thus, I'm planning on using 12V 45Ah wet cell battery (accumulator) for the supply.
The system consists of microcontroller unit, sensors, DC water pumps, communication module, and UI. As we all know, DC water pumps require a lot of current to operate. That's why I'm using a huge supply (45Ah), so the system can operate for a month.
But I wonder, how can I regulate the supply voltage into 5V and 3.3V? As far as I know, LM78XX voltage regulator IC has limited input currents rating. Looking forward for your respond.