There has been a lot of general and interesting discussion lately about charging lead acid. Many of the methods discussed will get the battery charged to some level. Most of them, in my opinion, will not fully charge the battery and will result in loss of capacity and useful life. Capacity (particularly) and life would seem to be valuable considerations in electric propulsion.
So a couple of points to remember. The chemistry benefits from a charge regime that raises the voltage to or near the "gassing point" (around 14.5V for 12V), holding it there for a time and preferably until the current tapers, then lowering the voltage to some "float" value (around 13.6 V for 12V) until the battery is "full". "Full" in most cases is the point where current reaches a small steady value (~2A / 100AH). ( I'm not a fan of floating lead acid so at that point I terminate the charge). Also note that charge voltage is dependent on temperature so should be adjusted for battery temperature.
If you look at the recommended charge regime for various manufactures you will find some minor differences, but the basic concept remains fairly consistent. So a couple of points to remember. The chemistry benefits from a charge regime that raises the voltage to or near the "gassing point" (around 14.5V for 12V), holding it there for a time and preferably until the current tapers, then lowering the voltage to some "float" value (around 13.6 V for 12V) until the battery is "full". "Full" in most cases is the point where current reaches a small steady value (~2A / 100AH). ( I'm not a fan of floating lead acid so at that point I terminate the charge). Also note that charge voltage is dependent on temperature so should be adjusted for battery temperature.
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Posted by: John Acord <jcacord@gmail.com>
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