Battle Born Lithium
In my research to learn more about Lithium batteries, and replacing the flooded 6V's in my rig, I just discovered Battle Born Lithium Batteries (Reno, NV) will soon be introducing a 250Ah battery, due...
Forum Discussion
There seems to be more to different battery types and inverter alarming than I realized.
Li has a flat internal resistance curve on discharge and voltage stays up (so no alarm) while lead acid batts have a linear increase in internal resistance as SOC goes down along with dropping voltage (so it alarms) I don't know what SiO2 is like in comparison (yet).
Meanwhile, Mr Wiz recently posted that his inverter pulls fewer amps running his MW at 75% SOC than it does at 95% SOC with his AGM (lead acid), BUT--the usual story is that the inverter will draw more amps as voltage drops in order to maintain the watts. He has a PSW inverter.
There might be something there between MSW and PSW for how they act, don't know (yet) Or something I have not noticed in how mine acts (same model of inverter, but with Wet 6s)
The usual story is that more AH bank means lower internal resistance, so you can do same MW down to a lower SOC with a bigger bank before it alarms.
In my SiO2 test, I ran the battery down with a nearly continuous 65% draw, and the inverter alarmed at 11.1 volts with SOC 60% (measured later as resting voltage) . What I did not test for, and perhaps makes a difference, is intermittent shorter time high draws where the battery can recover after each episode. More like real life camping. That might let you get farther down in SOC, don't know ( have to wait for some real life camping to learn that)
Anyway, there seems to be more to all this than I have always thought.
Li has a flat internal resistance curve on discharge and voltage stays up (so no alarm) while lead acid batts have a linear increase in internal resistance as SOC goes down along with dropping voltage (so it alarms) I don't know what SiO2 is like in comparison (yet).
Meanwhile, Mr Wiz recently posted that his inverter pulls fewer amps running his MW at 75% SOC than it does at 95% SOC with his AGM (lead acid), BUT--the usual story is that the inverter will draw more amps as voltage drops in order to maintain the watts. He has a PSW inverter.
There might be something there between MSW and PSW for how they act, don't know (yet) Or something I have not noticed in how mine acts (same model of inverter, but with Wet 6s)
The usual story is that more AH bank means lower internal resistance, so you can do same MW down to a lower SOC with a bigger bank before it alarms.
In my SiO2 test, I ran the battery down with a nearly continuous 65% draw, and the inverter alarmed at 11.1 volts with SOC 60% (measured later as resting voltage) . What I did not test for, and perhaps makes a difference, is intermittent shorter time high draws where the battery can recover after each episode. More like real life camping. That might let you get farther down in SOC, don't know ( have to wait for some real life camping to learn that)
Anyway, there seems to be more to all this than I have always thought.
