EcoRenovator - View Single Post - MPPT PV Watts not closely matching Open Voltage

pablo · 09-21-17, 10:49 AM

Thank you for the quick response and the image.

I really like the image as it clarifies how MPPT works. I annotated it to show how without MPPT the power is not maximized along different points. I thought someone else might like to literally see how MPPT works (well, at least on virtual paper).

Given there's sag when there's a load on a PV system, how does one determine the expected output under load?

If it helps any, below are the specs on my panels:

Module Watts STC: 280 Watts
Max Power Voltage (Vmpp): 31.50 Volts
Max Power Current (Impp): 8.89 Amps
Open Circuit Voltage (Voc): 38.50 Volts
Short Circuit Current (Isc): 9.43 Amps
Max System Voltage: 1000.00 Volts
Series Fuse Rating: 20 Amps
Module Efficiency: 17.11%
[*[ Temp Coefficient (Pmpp): -0.4100%
Temp Coefficient (Voc): -0.3100%

Thanks a lot!
-pablo

09-21-17, 10:49 AM	#3
pablo Lurking Renovator Join Date: Sep 2017 Location: Canada Posts: 3 Thanks: 2 Thanked 0 Times in 0 Posts	Thank you for the quick response and the image. I really like the image as it clarifies how MPPT works. I annotated it to show how without MPPT the power is not maximized along different points. I thought someone else might like to literally see how MPPT works (well, at least on virtual paper). Given there's sag when there's a load on a PV system, how does one determine the expected output under load? If it helps any, below are the specs on my panels: Module Watts STC: 280 Watts Max Power Voltage (Vmpp): 31.50 Volts Max Power Current (Impp): 8.89 Amps Open Circuit Voltage (Voc): 38.50 Volts Short Circuit Current (Isc): 9.43 Amps Max System Voltage: 1000.00 Volts Series Fuse Rating: 20 Amps Module Efficiency: 17.11% [*[ Temp Coefficient (Pmpp): -0.4100% Temp Coefficient (Voc): -0.3100% Thanks a lot! -pablo Attached Images