Today i have been playing with a smartsolar 100/30 and a solar king 100 ah lithium battery. With the custom settings, i set the absorption voltage at 13.8v. When in bulk mode the voltage quite quickly rises to 13.8v , at which point the controller switches to absorption. The battery is nowhere near fully charged at this point, and depending on the absorption time setting, switches to float.
The longest possible absorption time you can set is 2 hours, as the wake up battery voltage will be higher than 12.6v which triggers a 1/6 multiplication of the absorb time setting, the maximum being 12 hours.
Once the absorb time is up it switches to float, when set at 13.5v only delivers about 3 to 4 amps.
So, based on a 200w panel giving a max of about 10 amps, if the controller switches to absorption at the 50% mark, then getting the full 10 amps for 2 hours of absorption, at 3 to 4 amps charging, it will be lucky to get back to 100% by night fall. Infact it won't get to full as its only charging at 13.5v.
The voltages i have used are based on what i have read, being safe for long term lithium use. I could increase them but at a possible cost to battery cycle life?
I have bought these controllers to use on a large lithium bank, thinking they are fully configurable but appears they are not, unless i am missing something.