The Eco-w works just like the MS does and puts out the same numbers in it's short absorb and float stages. MPPT may not be tuning the array but the buck converter is still converting excess voltage to amps. That's why I saw 14a in float with a 230w panel. I would see up to 30a in float on the two 245w's when running a medium load on the inverter before the voltage of the battery dropped to the point of switching the twin Eco-ws back to MPPT. While running the air conditioner and charging the battery with three panels in series on the MS I saw 45a in absorb.
So the buck converter is still doing it's thing even if the MPPT program isn't tweaking the array any longer. It's not like there is a secondary PWM controller that is switched to after the bulk stage ends.
Salvo wrote:
If you use 12V panels with Eco W then it's OK to switch to pwm during abs. There may be a 5 - 10% drop in current. But if 24V panels are used then Isc is half as much and therefore pwm current is drastically reduced. Not good.
As far as I'm aware, no other mppt controller does that.
red31 wrote:
Salvo wrote:
I read in the Eco W manual that it only operates in mppt mode during bulk. In other words, during abs it goes to pwm mode. Is that what you see?
How would they see that? They report as much as double Isc in abs/float, so bucking is going on but not MPPT?
