Temperature Compensation--Battery or Ambient?
OK I have had my fill of why you need a temp comp probe to the battery casing or battery post (whichever one this week it is supposed to go on, the neg or the pos :) ) I understand temp comp and ag...
Forum Discussion
Mark, good post on the various aspects.
I still have my copy of your table from when we were looking at setting voltages for my 100a PowerMax variable voltage charger in cold temps a while ago.
At the time (was near freezing out) I was using 15.2 for 14.8 nominal and you pointed out that the battery might be warmer than ambient from being charged at 100a, so my voltage setting was probably too high.
I have no way to measure internal battery temp so it is a guessing game in a way. My answer is to use the table but back off the compensation a little.
If I am using the VEC1093DBD (it has temp comp) at the same time as the 100amper I can see on its readout what the VEC is using for voltage and use the same for the 100amper. I don't know the co-efficient for the VEC but I take it on faith that it is "about right."
I still have my copy of your table from when we were looking at setting voltages for my 100a PowerMax variable voltage charger in cold temps a while ago.
At the time (was near freezing out) I was using 15.2 for 14.8 nominal and you pointed out that the battery might be warmer than ambient from being charged at 100a, so my voltage setting was probably too high.
I have no way to measure internal battery temp so it is a guessing game in a way. My answer is to use the table but back off the compensation a little.
If I am using the VEC1093DBD (it has temp comp) at the same time as the 100amper I can see on its readout what the VEC is using for voltage and use the same for the 100amper. I don't know the co-efficient for the VEC but I take it on faith that it is "about right."
