If formal stats aren't available yet, could you provide any rough guidelines for something like a 48V bank and 140Vmp array? Are we talking below 90% efficiency?
Quote from: stephendv on February 02, 2011, 03:06:27 PM
If formal stats aren't available yet, could you provide any rough guidelines for something like a 48V bank and 140Vmp array? Are we talking below 90% efficiency?
Hi Stephen dv... No efficiency "curves" quite yet, but depending on how much power you are putting out at those voltages,
the efficiency will be around 96% to 97% or so. I am stating sort of on the low side here (as far as I remember), as I have seen higher but do not want to OVER state.
At low output powers, say, less than a couple hundred Watts, you might get below 90%, but at higher powers, you will be in the high 90's percentage wise.
I am also assuming a Classic 200 for this usage where the MPPV can be around 160 Volts with a 200V Voc
At low output powers, the idle losses become more important and eat into the efficiency numbers.
Also, the higher voltages eat into efficiency somewhat because the controller will run warmer.
I hope to get efficiency curves for many different powers and voltages real soon.
boB