Hey everyone, looking for some suggestions here.

I am from Godwood. I have a small rooftop system with a hybrid setup.

My configuration is 3.5 kWp PV panels (Sunova), with FOX ESS EVO Inverter & Home backup (6kW hybrid inverter paired with a 10kWh lithium battery).

For monitoring purposes, I am already using FoxCloud. But still, I am not happy with their overall service, especially with their Solar Forecasting, as they don't provide one.

While searching on Google for a free solar power forecast provider, I randomly found some websites. These are Solcast.com , Forecast.Solar and a new one named Solar-Forecast.com. I have personally used all of them in the last 1 month.

Solcast is quite reliable. Forecast.solar is not that accurate. However, the AI/ML personalization of Solar-Forecast.com looks pretty cool.

Looking for opinions from other members on this? What's your take?

You can try the following

https://solar.meteosource.com/

www.tutiempo.net

Weather

World weather and local weather forecast. The weather forecast for 15 days, hourly forecast and current conditions.

I personally use the Tutiempo site, which I found to be the most accurate (even though it's located in Italy...)

Edited February 6Feb 6 by HennieL
corrected error

@sam.tech96 ,

I use the Open-Meteo Solar Forecast Integration available in HACS for my forecasting, on which I base automations on to determine how low to take my batteries down in the morning, based on this forecast. I'd say about 90% accurate.

On 2026/02/06 at 11:01 AM, HennieL said:

You can try the following

https://solar.meteosource.com/

www.tutiempo.net

Weather

World weather and local weather forecast. The weather forecast for 15 days, hourly forecast and current conditions.

I personally use the Tutiempo site, which I found to be the most accurate (even though it's located in Italy...)

I would surely check that out

On 2026/02/06 at 11:53 AM, Sidewinder said:

@sam.tech96 ,

I use the Open-Meteo Solar Forecast Integration available in HACS for my forecasting, on which I base automations on to determine how low to take my batteries down in the morning, based on this forecast. I'd say about 90% accurate.

I would surely check that out

On 2026/02/06 at 8:23 AM, Sidewinder said:

I use the Open-Meteo Solar Forecast Integration

Thanks for this link, Sidewinder - After using it for the past week I can confirm that it is pretty accurate, and quite comprehensive.

There are several free tools available that can help estimate solar power generation and forecast system performance. Many of these platforms use historical weather data, solar irradiation levels, and system configuration details to provide fairly accurate energy production estimates.

One widely used option is the PVWatts Calculator developed by National Renewable Energy Laboratory. It allows you to enter your location, system size, panel orientation, and other parameters to estimate annual and monthly solar energy production.

Another popular platform is PVGIS provided by European Commission, which offers detailed solar radiation data and system performance calculations for many regions around the world.

These tools are very helpful during the planning stage because they allow you to compare different system sizes, panel angles, and locations before installation. While they provide good estimates, it’s still important to have a professional system design done to account for factors like shading, roof layout, and local electrical requirements.

Overall, free solar forecasting platforms are a great starting point for understanding how much energy a potential solar system could generate.