Solcast Products

Testing the Solcast data API

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Live and Forecast

How often do you update the forecast and live data?

Getting started with Rooftop PV sites

Where do I find my Resource Id?

Rooftop PV Model

Advanced PV Model

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Historical Time Series

Historical Time Series Overview

Historical Time Series - Time Date Formats

What is a Time Series data 'request'? How many 'requests' do I need?

Do you store old/historical forecasts?

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Grid Aggregations

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Typical Meteorological Year (TMY)

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Horizon Angles

Horizon Angles - FAQs

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Historical Forecast

Data Modelling

Modelling - FAQs

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Explaining Terms

What is Spatial Resolution?

Why we don't provide data in local time?

Terrain Tilt and Azimuth

What is tilt? How can I estimate my rooftop solar system's tilt?

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Resolution and Accuracy

Solar Radiation Forecasting and Historical Data

Global Coverage

Solcast API

What is an API request? How many API requests do I need?

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Documentation

Postman API (Spec) Documentation

Data Parameter Definitions

API Change Log

What is an API? What is an API key? How do I use my API key?

Authentication with the Solcast API

PVsyst

What is the difference between PV, PV10, PV90?

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API Troubleshoot

Data Troubleshooting

Hobbyists and Researchers

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Home Hobbyist Accounts

Home Hobbyists - FAQs

Issues adding your 2nd home PV site

PV Tuning Discontinued

Creating a second PV site

How do I create a multiple azimuth Rooftop Solar site?

How do I delete my account?

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Researchers and Academic Accounts

Researcher - FAQs

Researcher and Student access to the Solcast API service

How do I cite the Solcast API service in my research work?

Troubleshooting and FAQs

Data Troubleshooting and FAQs

What timezone are the timestamps?

User Guides

Subscription Management ❓Account FAQs

AC/DC capacity in home solar panels

Understanding how to tell the difference between AC Capacity, DC Capacity, and what that means for your home solar setup.

What is my AC capacity? What is my DC capacity? What is the difference between AC and DC? How do I find these values?

Don't worry, this is easier than you think!

AC Capacity

The AC capacity is the size of your inverter, in Watts. You can simply inspect your solar inverter, to determine the wattage. If you have more than one inverter, add up the total wattage from all inverters to determine your AC capacity. Most inverters report capacity in kilowatts (kW), so be sure to convert to watts by multiplying by 1000.

DC Capacity

The DC capacity is the total wattage of all of your solar panels. You'll need to figure out what the 'rating' of your solar panels is, and then sum up the total of all the solar panels in your solar array. The value should be provided in Watts.

If you don't know or can't easily find out these values by inspecting your PV system, you should consult the paperwork from your installation or contact your solar installer to figure them out.