This shot shows the charger almost ready to exit bulk charging and enter absorption charging.


The term "bulk voltage" may sound fancy & technical but there really is no such thing as a "bulk voltage" because bulk is constant current charging. You can refer to a "bulk transition voltage" (also the absorption transition) where the charger ceases being in constant current but once voltage is held steady or becomes "voltage limited" the charger is no longer in BULK it is in constant voltage not constant current....


If you look closely you can see a little red light next to the letters CC. This means constant current or BULK charging.


Bulk charging is the most efficient part of the recharging process with efficiencies ranging close to 100% of energy delivered by the charger being usable and stored. Once the process switches from constant current/bulk to constant voltage/absorption charge efficiency continues dropping. In the high 90's we are converting a lot less of the supplied energy into stored energy.