Originally Posted by rmkrum
And there you have solid evidence that the Parallax that Airstream used as OEM until about 2017 is a single stage fixed output POS convertor. No wonder that darn thing killed 2 sets of my batteries is a short time. I won’t give it another chance...
What model of Parallax do you have? All the ones I looked at on their website show that they are 3 stage and many of them offer temperature compensation as well.
Mine is the old 7455 which at best was a 2 stage, but only if you had the "T" option. Otherwise it was fixed at 13.8 volts. See link.
In reality you not only need a proper charger, but it should have Temperature compensation as well. Otherwise you will ruin your batteries.
I only use this charger for a short term when snow covers my panels, otherwise it gets charged from my solar charger, which has 4 stages plus temperature compensation.