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Questions tagged [solar]

67 questions
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Why does this output irradiance forecasted values to be somewhat the same? I am using PVLIB's GFS model. What am I doing wrong here?

#Initialize the mode here model = GFS(resolution='half', set_type='latest') #the location I want to forecast the irradiance, and also the timezone latitude, longitude, tz = 15.134677754177943, 120.63806622424912, 'Asia/Manila' start =…
Marc Valencia
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Trying to read an Omnik Inverter without any available documentation through USB by use of PyModBus

My solar panels are connected to an Omnik Inverter (5000tl2). That company has gone bankrupt and the available documentation does not specify the use of the USB port or the registers on the inverter itself. I am trying to read data thats on the…
Scoobie
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How to achieve automatic roof 3d modelling from national open LiDAR data for solar PV shadow analysis?

this is my first post, I'm trying to automatize the process of rooftop analysis for the installation of solar photovoltaic (PV) systems. I'm not sure what the input data should be but I've though of the following: Spanish national LiDAR 0.5 pt/m2…
Héctor
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Trying to use Google Sheets to connect to the Enphase solar API. Can't get the code to work?

Background: I have barely any knowledge of coding but I want to be able to use my solar output data from the Enphase system to trigger a hot water service to run. How I'm trying to do this is by moving the solar data into Google Sheets and when the…
Jamie
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get solar year in react

how can I get current solar year local fa (not full date) in react? I just need to get solar year (jalali) and I'm using this: new Date().toLocaleDateString('fa-IR'); but it return current date (24/04/1399). I just want (1399)
Zahra Talebi
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Has anyone implemented a function to calculate the direction of solar radiation?

I want to calculate the direction of solar radiation for every hour (that the sun is up) in the Netherlands in 2017, 2018 and 2019. I'm doing a research about the generation of solar panels, and I think this feature would add a lot to my models. I…
Maxime
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solaR function calcGef is creating zero's and NA's from existing numeric data

this is my first time asking a question on forums like this. I am using the solaR package. I have created a zoo object with an index of SolarTime (using the local2Solar function), column 1 is the load, column 2 is the G0 (global irradiance) required…
Kirrilie Rowe
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Can I use roaring bitmap for lucence inverted index

We've more than 5 billion documents that needs to be indexed for full text search. All of these documents are static and never needs to be changed. After a lot of research we found that using roaring bitmaps with Redis to build an inverted index is…
Mahmoud Samy
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How to solve modbus error on solar inverter?

I am currently working with one of Growatt inverters, 5 KVA residential inverter, It has two ports one is RS-485 I have connected a Smart Energy Meter with it to control backpower flowing to grid, and on the other port Growatt wifi device was…
Muzzammil Hussain
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How to calculate solar radiation on vertical (house) walls?

I want to calculate the solar radiation on walls which are oriented towards north, south ect. I have the solar radiation for the location and I have tried the following equation: S_module = S_incident *…
Maik
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How to determine issue of weirdly shaped hourly PV power output curve from PVlib

My hourly pv power using pvlib is unusually high in the mornings and low in the evenings. It seems like the peak is shifted towards the morning. This is one random day's output power with corresponding irradiance data (W/m2): Time | AC Power [kW]…
Aggotrom
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Plot time vs angle; how to convert time into a number

I am trying create a plot(angle of incidence vs. time). Time is set between hour of sunrise to hour of sunrise (6:37:00 AM - 6:39:00 PM). I have to find angle of incidence for each minute interval starting from sunrise to sunset. The only issue is I…
Ramon Cardenas
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Why the Elevation is wrong for my coordinates, can anyone explain me

There might be several similar questions and of course that helped me find a way to calculate sun position for specific lat-long coordinates, in my case Berlin. But I am getting the wrong result. There is an 8 or 9-degree difference in my result.…
FRQ
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Minor mistake in calculation of extraterrestrial radiation (method 'asce')?

While looking at the code for the calculations of extraterrestrial radiation get_extra_radiation() and crosschecking it with literature, I noticed that for both methods 'asce' and 'spencer' the solarposition._calculate_simple_day_angle(doy) function…
Schmelzer
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PVLIB setting DC power ratio

I've been requested to use pvlib with python to estimate solar PV performance, and from the documentation most of it seems logical. However, the examples show that you specify a module, and an inverter, and there doesn't appear to be any variable…
J.Komodo
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