I was looking to create a 10amp manual charger with variable voltage and current option for flooded lead acid battery (normally used in cars).
I only know some basic electronics and usually make solutions by integrating off the shelf modules.
For this project I have to first buy or order a custom built 10amp step down transformer but I was bit confused what should be the secondary output voltage for this transformer
To charge a FLA battery we usually need up to 14.2V and to equalize we need 15V that is maximum output we need from a battery charger
Therefore my question is should I look for a transformer with exactly 15V secondary output? or higher than this and why? because some online battery charging circuits are using 18V transformers.