Tri-Metric 2020 and Temp Compensation

Kamala

My PV system has been up and running since Aug 1st. This was the 4th weekend of use and it has surpassed my expectations. Yesterday I used the MSView software to adjust the charge setpoints of the Morningstar SunSaver MPPT-15 (with RTS) to the battery mfgrs specs. I set absorption to 14.4V (.1V lower than default) and float to 13.35V (.35V lower than default.) These adjustments are probably not critical but what the heck!

Here is the problem: The Tri-Metric manual says to set the charged voltage to .1V below the controller's setpoint. So, 14.3V. Now, it's 84°F when the controller goes to float. At that temperature the setpoint is lowered to 14.28V and the Tri-Metric doesn't know that the battery has been charged. I find nothing the Tri-Metric documentation that indicates that it is temperature compensated.

This problem is not system critical except in the sense that the accuracy of the monitor is degraded.

Am I tilting at windmills here? :roll:

Craig

niel

Re: Tri-Metric 2020 and Temp Compensation

i doubt that it will matter as the trimetric is a bit of a guessing game anyway. you have to enter ah and the exact ah really isn't known and will change somewhat with time too. charge efficiency is another inexacting factor. i have the 2020 and i wasn't that impressed with it and i don't use mine at all.

Kamala

Re: Tri-Metric 2020 and Temp Compensation

So do you use a battery monitor?

niel

Re: Tri-Metric 2020 and Temp Compensation

not at all. i watch the voltage.