I have a couple of lead acid batteries that need to be stored so I though up of a simple trickle charger with the following objectives in mind:
- Should waste least amount of power so that power could be applied to the batteries as long as possible
- Should be simple as it will be operated manually (voltage will be checked with a multimeter and connected and disconnected manually)
- AC-DC power module from Hi-Link (part#:HLK-20M15) which outputs 15V with a max of 1.33A (20W) which has output short circuit and over current protection and self-recovery.
- The diode for reverse polarity protection as well as a drop 1.1V which will allow the max output voltage to be 13.9V and
- The 1ohm resistor is added as a current limiting resistor which can drop 1.33V at max output current.
Reasoning: A total voltage drop of 2.4V (diode + resistor) from a 15V supply should allow me to charge the battery from 12.6V. I will be using a proper tested and certified charger for bulk charging if the voltage drops below 12.6V.
Question: All that said I wanted to know if:
- This should suffice from a safety point of view or any changes are required
- Does charging to 13.9V for storage good enough for long term storage since I won't be drawing any current from it because I've seen some batteries require boost voltages of about 14.4-14.6V and some people suggested boost upto 16V.