Hi I have in mid Germany 2 x 420W / 40V panels on a south-west oriented balcony tilted 60°.
They were sold with a 800W Grid-Tied converter. OK on an overcasted rainy day, the yield was zero. More or less normal: the AC converter needs minimum of power to run.
I bought a Victron MPPT 75/15 hoping to get a least a little DC energy from my panels.
I was very disappointed to see that also Victron MPPT 75/15 was harvesting nothing.
Is that normal?
When the weather is clear and the winter sun shines, I can get 450W from my panels, this looks IMHO OK.
But I expected at least 30-50W on cloudy weather. Is that unrealistic?