AGM battery setpoints?
Now that I have this nice fully adjustable Rogue MPPT 3048 I suddenly realized that I don't know battery setpoints - Absorb V, Float V and Full I (charging current at SOC 100). Alright, current in...
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Almot wrote:full_mosey wrote:
I could achieve the table accuracy you seek by using their temp adjustment formula to arrive at an exact Voltage for any temperature in .1F increments, a very long table going up to 110F.
No, you can't. At 77F your table (let's talk about Deka since I don't have same inaccurate table for my UPG yet) suggests 13.8-14.58. What value will you choose as a reference point that is not altered by temp compensation? Flip a coin and decide on 14.0, and let temp comp to work up and down from there? Why not 14.3 or 13.9? The range that they "allow" at 77F is wider than the range of temp compensation. The same goes for any given temperature in the table - wide range at any temperature point. What's the use of temp compensation then ? :)
In my case it gets worse. The allowed range at 77F is narrower, but values are higher: 14.4-15.0. Suggested setpoint is 14.7 at 77F. When it gets colder, temp compensation will raise it above 14.7 - hard to believe that this can be good for a battery.
You are absolutely correct, I apologize for making such a boneheaded statement. I cannot make any type of EXACT table or calculation.
Perhaps I don't understand what you mean by worse when a Voltage range is given as the charging voltage. Is there some negative impact to me?
HTH;
John
