Hey everyone, I am trying to build a battery powered water valve, using a solenoid, which is 12V activated.
For powering it, I thought on using 4 18650 batteries connected in series and a step down to get always 12V. Now, the issue is on how can I recharge those 4 batteries...
My initial impulse (Primarily because I have tons of these) is using 4x 03962A modules (1pcs Micro USB 5V 1A 18650 TP4056 Lithium Battery Charger Module Charging Board With Protection Dual Functions 1A Li ion|Integrated Circuits| - AliExpress) and wire them in series, connecting each of them with one 18650 cell, so a basic diagram would look like this (Forgive me the bad quality drawing):
Now, does this sound reasonable? do you have a better suggestion on how to approach this?
Thank you all !