Sal that is compared to panel direct. I am pretty sure it is accurate. Sun is strong here and it was over 90 degrees. At 16.5v the panel still generated good power, but most of the day the max power point found manually was between 14.5v and 16v. It was not a crystal clear blue day though there were only a few thin clouds. I bet under standard test conditions the max power point really is 16.5.
The panels were almost scalding to the touch, but the Unisolars are not supposed to drop much until temps are quite high. I will take some temp readings tomorrow.
I was pleased that where I normally get high 3's to just over 4.0 amps into the battery from just one panel, I got over 4.5v in for many hours. Panel direct to the batteries yielded substantially similar results to my PWM controller. I imagine if measurable the buck booster would have been just slightly better vs PWM compared to panel direct, just because of voltage drop losses through the FETs.
Jim
On last edit, I was maximizing amps *to* the battery though. Not watts *from* the unisolar. So the buck booster efficiency table comes into it. I have a watt hour meter at the buck booster input as well as into the battery so I can check max power generation from the panel vs. max power to the battery. The power supply efficiency line is not linear.
