UpTop Solar 101 #7 : String Sizing

String Sizing can be tricky. In this video we will go over a hand calculation example and a tool that makes this much easier!
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String Sizing Tool Here: uptopsolarpower.com/string-si...
*Inverter Specifications Operating Current is Highlighted when short circuit current should be. Will update later.
#solar #solarenergy #solarpower #stringsizing #solarpanel #inverter #solarmodules #battery #batteries #loadshedding #loads #diysolarsystem #diysolar

[@noenuguit440]

You're good easy to understand or follow. Thanks

[@uptopsolar]

Thanks, I appreciate the kind words!

[@irfanzahid1506]

Could you explain....why max fault current contribution is greater in low capacity of solar inverter compare to high rating solar inverter.

[@uptopsolar]

Hi! Can you clarify your question? Are you implying and asking why do lower capacity inverters (smaller inverters like residential) have higher fault current contribution than larger inverters (utility scale)? If so can you share two models as examples so that I better understand the question and see the type of inverter and fault current ratings on both models?

[@irfanzahid1506]

@@uptopsolar yes my question is, why low capacity of inverter has max fault current contribution (1 cycle RMS) is more than high capacity of inverter of max fault current contribution (1 cycle RMS) .
For example:-
a. Cps inverter model name CPS SCA 36ktl-DO/US- 480 has fault current contribution (1 cycle RMS) is 73.2A (1.68 PU), while
b. Cps inverter model name CPS SCA 60 ktl-DO/US-480 has maximum fault current contribution (1 cycle RMS) 64.1 A (1.6/0.88 PU).

[@keyable]

Whats the difference between Rated MPPT Voltage range and MPPT Operating Voltage range?

[@uptopsolar]

I couldn't find the SMA manual that shows this, but from my experience with other inverters... MPPT Operating Voltage Range is where the inverter can operate and perform some MPPT, it's a wider range. Then Rated MPP Voltage range is the range where the inverter can out put it's max power. So in this example it appears that between 100Vdc and 155Vdc there could be some derating, same thing on the high end (between 480Vdc and 550Vdc). Between 155Vdc and 480Vdc, you could expect full power output.

[@keyable]

@@uptopsolar Thanks for the information!