Lora Remote water level and pump server powered with solar panel

Hi Renzo I am building your Lora remote water tank projects, just one thought - I want to make the master controller also battery/solar operated due to where we are there is no 220V infrastructure (Namibia) for it to be as efficient as possible I want to leave out the display and rotary knob, I only require auto start and stop as well as manual start and stop. is there a possibility to purchase your schematic diagram of the master. Many thanks for the super idea.