coarsegoldkid
New Member
- Joined
- Nov 18, 2019
- Messages
- 7
Will I enjoy your videos and now have your book as reference but all my questions are not answered.
Everyone bare with me please. It's likely very simple but I'm confused after looking at several vendors methodology in selecting a charge controller. Some vendors use a working voltage which must be a computed figure given the specs below. As an exercise I selected the specs on a Solar panel.
Rated Power: 340W
Open circuit voltage (VOC): 51.3 V
Max power voltage (VMP): 42.5 V
Short circuit current (ISC): 8.00 A
Max power current: 8.52 A
Maximum system voltage: 1500V UL and IEC
Power Tolerance: +5/-0 %
Fuse Rating: 15 A
Would I be correct in calling them 42.5v(max power voltage ) @ 8a(short circuit current) panels=340w in various configurations and use those figures in selecting a charge controller? But then there is that Power Tolerance of +5/-0% to contend with. What do I do with that? Power is watts. Which come to +/- 17watts. Plugging in those numbers would change the outcome. However, I've seen calculators that use the Max open circuit voltage to calculate total voltage.
What is the best method?
Some vendors apply a safety factor of 25%. And some a temperature coefficient? Not shown in specs.
thanks in advance
Everyone bare with me please. It's likely very simple but I'm confused after looking at several vendors methodology in selecting a charge controller. Some vendors use a working voltage which must be a computed figure given the specs below. As an exercise I selected the specs on a Solar panel.
Rated Power: 340W
Open circuit voltage (VOC): 51.3 V
Max power voltage (VMP): 42.5 V
Short circuit current (ISC): 8.00 A
Max power current: 8.52 A
Maximum system voltage: 1500V UL and IEC
Power Tolerance: +5/-0 %
Fuse Rating: 15 A
Would I be correct in calling them 42.5v(max power voltage ) @ 8a(short circuit current) panels=340w in various configurations and use those figures in selecting a charge controller? But then there is that Power Tolerance of +5/-0% to contend with. What do I do with that? Power is watts. Which come to +/- 17watts. Plugging in those numbers would change the outcome. However, I've seen calculators that use the Max open circuit voltage to calculate total voltage.
What is the best method?
Some vendors apply a safety factor of 25%. And some a temperature coefficient? Not shown in specs.
thanks in advance