Quick Test of Eco-Worthy MPPT Controller
Ordered it on 3 Oct arrived at the door 23 Oct free shipping. Controller rated to 42V so watch that. EG I have it on one 230w panel, Voc 37v at 25C, so would be more Voc at cold temps. Not ab...
Forum Discussion
BFL13 wrote:
I was thinking more like how two 150w panels in series would be 44 Voc so be over the 42v limit. I don't have an example of a 300w panel to check its Voc. Anybody know?
this might be a "achilles heel" of the eco worthy. In my post on mppt controller test data, my two 80W panels each had a Voc of 20.9V at 70F (115F panel temp). That puts them right at the limit of 42V in series, and we are at warmer temps. what they have for Voc at lower temps could be an issue. I'm somewhat suprised at the low 42V limit, I would have expected either around 48V or around 72V.
BTW, I'll be at the oregon coast this weekend with my panels and the morning temps and evening temps are likely to be in the 40's. I'll check my panels early morning and late evening and see what they read in series for open circuit voltage.
And looking at data, it seems like the Voc and Vmp voltages are somewhat mfg dependent for a given panel wattage. They seem to vary about 2V for Voc and Vmp for a given "nominal" 12V panel voltage even for the same nominal power.
