# \[APP\]\[Pro\] Solar Forecasts (SolCast + Forecast.Solar) **URL:** \ **Category:** Apps\ **Created:** [April 29, 2021, 7:25am UTC](https://community.homey.app/t/app-pro-solar-forecasts-solcast-forecast-solar/46842 "2021-04-29T07:25:41Z")\ **Posts on this page:** 20\ **Page:** 19
**Author:** ![Pieterv123](https://sea1.discourse-cdn.com/flex025/user_avatar/community.homey.app/pieterv123/32/13353_2.png) [@Pieterv123](https://community.homey.app/u/Pieterv123)\ **Post date:** [November 16, 2025, 12:28pm UTC](https://community.homey.app/t/app-pro-solar-forecasts-solcast-forecast-solar/46842/363 "2025-11-16T12:28:42Z")
Everybody will have this issue. There is something wrong with the Solcast servers. It is the same for the Home Assistant users. Let’s just wait and see ---
**Author:** ![Pieterv123](https://sea1.discourse-cdn.com/flex025/user_avatar/community.homey.app/pieterv123/32/13353_2.png) [@Pieterv123](https://community.homey.app/u/Pieterv123)\ **Post date:** [November 16, 2025, 7:57pm UTC](https://community.homey.app/t/app-pro-solar-forecasts-solcast-forecast-solar/46842/364 "2025-11-16T19:57:07Z")
The Solcast API works again. It works best to get latest data by doing a Midnight update. ---
**Author:** ![Swiba](https://sea1.discourse-cdn.com/flex025/user_avatar/community.homey.app/swiba/32/120949_2.png) [@Swiba](https://community.homey.app/u/Swiba)\ **Post date:** [March 13, 2026, 3:24am UTC](https://community.homey.app/t/app-pro-solar-forecasts-solcast-forecast-solar/46842/365 "2026-03-13T03:24:08Z")
@Pieterv123 Thank you for this app. It is really great to have an outlook on solar production. I have a time of use energy tariff with fixed time slots in the day of low and high prices. To be able to load my battery correctly to bridge the high price slots, I would need to be able to forecast my energy production at 5AM for the next 6 hours and at 3PM for the remainder of the day. Is there a way to get the exact forecasted kWh as a tag available in Homey? A kind of “fetch the forecast between starttime and endtime”-card. Would this be possible? Or is it already possible with the cards and tags available and did I overlook it? Or do you see another way to solve my use case? Thank you in advance! ---
**Author:** ![Pieterv123](https://sea1.discourse-cdn.com/flex025/user_avatar/community.homey.app/pieterv123/32/13353_2.png) [@Pieterv123](https://community.homey.app/u/Pieterv123)\ **Post date:** [March 13, 2026, 5:44am UTC](https://community.homey.app/t/app-pro-solar-forecasts-solcast-forecast-solar/46842/366 "2026-03-13T05:44:32Z")
Yes it is possible. Check the condition cards. I think solcast has more cards. And there is a trigger remaining before which has a tag. Condition cards in homey don’t allow tags, that is a homey limitation ---
**Author:** ![Johan\_Bruyn](https://sea1.discourse-cdn.com/flex025/user_avatar/community.homey.app/johan_bruyn/32/132683_2.png) [@Johan\_Bruyn](https://community.homey.app/u/Johan_Bruyn)\ **Post date:** [March 13, 2026, 10:42am UTC](https://community.homey.app/t/app-pro-solar-forecasts-solcast-forecast-solar/46842/367 "2026-03-13T10:42:47Z")
These are the cards I use. You can ask if enough energy is expected to charge your battery. You might find my flow, which I use to manage my batteries, helpful. It is in Dutch. But I think you will figure it out. if card ![Scherm­afbeelding 2026-03-13 om 11.31.15](https://us1.discourse-cdn.com/flex025/uploads/athom/original/3X/8/0/8083529aeae2a3f3e199d0e46c3244a16b4de662.png) And cards ![Scherm­afbeelding 2026-03-13 om 11.31.54](https://us1.discourse-cdn.com/flex025/uploads/athom/original/3X/b/2/b26725c7b93b27bddefaaa7b51317bd53540ecfe.png) ![Scherm­afbeelding 2026-03-13 om 11.31.37](https://us1.discourse-cdn.com/flex025/uploads/athom/original/3X/f/c/fce4818e21ca20e0bba5f28c8cc17647cb5102f0.png) > [@Uitgesteld & geforceerd laden Homewizzard batterij](https://community.homey.app/t/uitgesteld-geforceerd-laden-homewizzard-batterij/139216/23): > > Het geforceerd laden bij onvoldoende zon verwachting bleek van de week niet goed te werken. Instellingen power by the hour stonden verkeerd. Al zie hier in de schermprint dat ze wel goed stonden. Geen idee wat daar dan gebeurt is. Zal wel hebben lopen prutsen. En na volledig laden gaat de batterij modus in standby. Dus dan werkte mijn flow ook niet om weer naar NOM te gaan als de prijs hoog is. Dat opgelost met ja/nee variabele. (simpel en doeltreffend) ---
**Author:** ![Swiba](https://sea1.discourse-cdn.com/flex025/user_avatar/community.homey.app/swiba/32/120949_2.png) [@Swiba](https://community.homey.app/u/Swiba)\ **Post date:** [March 14, 2026, 8:26am UTC](https://community.homey.app/t/app-pro-solar-forecasts-solcast-forecast-solar/46842/368 "2026-03-14T08:26:05Z")
Thanks for reaching out and the help. I need to be able to estimate the production 6 hours in advance to charge the battery in advance to bridge the high price period. No dynamic tariff here that changes every hour but high price blocks from several hours - from 7AM to 11AM and 5PM to 10PM. the problem is not to trigger charging when needed (as with the suggested condition cards) but knowing how much to charge or when to stop. So a tag that gives the prediction of the upcoming 6 to 7 hours would be handy. Now Solcast and Forecast.Solar forecast tags only go up to 3 hours. Is there a way to get this out of the forecast app or to calculate it based on the day forecast or remaining forecast? Thanks again for your help and consideration. ---
**Author:** ![Johan\_Bruyn](https://sea1.discourse-cdn.com/flex025/user_avatar/community.homey.app/johan_bruyn/32/132683_2.png) [@Johan\_Bruyn](https://community.homey.app/u/Johan_Bruyn)\ **Post date:** [March 14, 2026, 9:23am UTC](https://community.homey.app/t/app-pro-solar-forecasts-solcast-forecast-solar/46842/369 "2026-03-14T09:23:56Z")
At the moment, that option isn’t available. We have to ask Pieter for that. But I’ve solved it creatively. Calculate how much your battery still needs to charge. Then use this value in a flow chart. That way, you can charge the battery at full power when insufficient sun is expected, and with the PV surplus when enough is expected. This part of my flow switches the battery back to charging with PV surplus if more energy is expected than is needed to charge the battery. ![Scherm­afbeelding 2026-03-14 om 10.18.22](https://us1.discourse-cdn.com/flex025/uploads/athom/original/3X/2/c/2c8b2111de9c40c6d083f635b9d71193addaf20a.jpeg) ---
**Author:** ![Swiba](https://sea1.discourse-cdn.com/flex025/user_avatar/community.homey.app/swiba/32/120949_2.png) [@Swiba](https://community.homey.app/u/Swiba)\ **Post date:** [March 15, 2026, 4:24pm UTC](https://community.homey.app/t/app-pro-solar-forecasts-solcast-forecast-solar/46842/370 "2026-03-15T16:24:04Z")
Hi @Pieterv123, Thanks for the suggestion. I overlooked the “remaining Fcst”-tag, so my evening use case is now covered. In the morning a “forecast next 6 hours”-tag would come in handy. Is there a way to foresee this in your app? Thank you very much indeed. ---
**Author:** ![Pieterv123](https://sea1.discourse-cdn.com/flex025/user_avatar/community.homey.app/pieterv123/32/13353_2.png) [@Pieterv123](https://community.homey.app/u/Pieterv123)\ **Post date:** [March 20, 2026, 9:50am UTC](https://community.homey.app/t/app-pro-solar-forecasts-solcast-forecast-solar/46842/371 "2026-03-20T09:50:05Z")
I could make this, but can’t you use the remaining before cutoff time is less then? Or the same condition card? So if you need let’s say 3kwh for your house, it will say when it is less and then you charge your battery. It will also make the remaining before this time available as a tag. ![IMG_2680](https://us1.discourse-cdn.com/flex025/uploads/athom/original/3X/a/f/af06d8224e752b7cf11ec8f0e457c0f7889ddf78.jpeg) It would be easier with a condition card, but Homey does not support this ---
**Author:** ![Swiba](https://sea1.discourse-cdn.com/flex025/user_avatar/community.homey.app/swiba/32/120949_2.png) [@Swiba](https://community.homey.app/u/Swiba)\ **Post date:** [April 7, 2026, 2:40pm UTC](https://community.homey.app/t/app-pro-solar-forecasts-solcast-forecast-solar/46842/372 "2026-04-07T14:40:53Z")
Hi Pieter, Thanks for the tips. They inspired me… I managed to solve my issue to do a kind of iterative request to get an estimate of the production in a specific timeframe and it works. See example below: ![Scherm­afbeelding 2026-04-07 om 16.39.39](https://us1.discourse-cdn.com/flex025/uploads/athom/original/3X/d/a/da75403aee38c688e1d082860281e6917adcc460.jpeg) ---
**Author:** ![Rmb](https://sea1.discourse-cdn.com/flex025/user_avatar/community.homey.app/rmb/32/79135_2.png) [@Rmb](https://community.homey.app/u/Rmb)\ **Post date:** [May 18, 2026, 8:22am UTC](https://community.homey.app/t/app-pro-solar-forecasts-solcast-forecast-solar/46842/374 "2026-05-18T08:22:39Z")
The actual power of my PV panels is almost twice the “Current Prediction”. Is that normal or am I interpreting things in a wrong way? ---
**Author:** ![Pieterv123](https://sea1.discourse-cdn.com/flex025/user_avatar/community.homey.app/pieterv123/32/13353_2.png) [@Pieterv123](https://community.homey.app/u/Pieterv123)\ **Post date:** [May 18, 2026, 8:49am UTC](https://community.homey.app/t/app-pro-solar-forecasts-solcast-forecast-solar/46842/375 "2026-05-18T08:49:41Z")
If it is a cloudy day, that is possible. The forecast is an average for 30min. Also depends on how often you fetch new data ---
**Author:** ![Rmb](https://sea1.discourse-cdn.com/flex025/user_avatar/community.homey.app/rmb/32/79135_2.png) [@Rmb](https://community.homey.app/u/Rmb)\ **Post date:** [May 18, 2026, 8:55am UTC](https://community.homey.app/t/app-pro-solar-forecasts-solcast-forecast-solar/46842/376 "2026-05-18T08:55:12Z")
Ok, but on a sunny day I would expect the highest predicted value to somehow match the highest production value of the panels. A timeshift would be understandable. By the way, I am using Forecast.Solar. ---
**Author:** ![Pieterv123](https://sea1.discourse-cdn.com/flex025/user_avatar/community.homey.app/pieterv123/32/13353_2.png) [@Pieterv123](https://community.homey.app/u/Pieterv123)\ **Post date:** [May 18, 2026, 9:06am UTC](https://community.homey.app/t/app-pro-solar-forecasts-solcast-forecast-solar/46842/377 "2026-05-18T09:06:28Z")
Nothing I can do, the app just fetches the data. Forecast.Solar is less reliable then Solcast. ---
**Author:** ![Rmb](https://sea1.discourse-cdn.com/flex025/user_avatar/community.homey.app/rmb/32/79135_2.png) [@Rmb](https://community.homey.app/u/Rmb)\ **Post date:** [May 18, 2026, 11:45am UTC](https://community.homey.app/t/app-pro-solar-forecasts-solcast-forecast-solar/46842/378 "2026-05-18T11:45:08Z")
Of course I can raise the peakpower of the panels. I also changed the orientation of the panels in the app to the most suitable position, but the predicted power never matches the maximum of the measured power. So I was just wondering. 🧐 ---
**Author:** ![Antohagg](https://sea1.discourse-cdn.com/flex025/user_avatar/community.homey.app/antohagg/32/48013_2.png) [@Antohagg](https://community.homey.app/u/Antohagg)\ **Post date:** [June 7, 2026, 8:52am UTC](https://community.homey.app/t/app-pro-solar-forecasts-solcast-forecast-solar/46842/379 "2026-06-07T08:52:31Z")
Trying to figure out the difference between “Fetch update” and the button click. But cant see any difference. @Pieterv123 Is there any? ![IMG_2572](https://us1.discourse-cdn.com/flex025/uploads/athom/original/3X/8/f/8f3f68d03196c57275b5eb365a9996103fcd61d8.jpeg) ---
**Author:** ![Pieterv123](https://sea1.discourse-cdn.com/flex025/user_avatar/community.homey.app/pieterv123/32/13353_2.png) [@Pieterv123](https://community.homey.app/u/Pieterv123)\ **Post date:** [June 7, 2026, 9:25am UTC](https://community.homey.app/t/app-pro-solar-forecasts-solcast-forecast-solar/46842/380 "2026-06-07T09:25:02Z")
It is the same. Button click is available from UI ---
**Author:** ![Xander\_Hoose](https://sea1.discourse-cdn.com/flex025/user_avatar/community.homey.app/xander_hoose/32/131829_2.png) [@Xander\_Hoose](https://community.homey.app/u/Xander_Hoose)\ **Post date:** [June 8, 2026, 9:02pm UTC](https://community.homey.app/t/app-pro-solar-forecasts-solcast-forecast-solar/46842/381 "2026-06-08T21:02:11Z")
@Pieterv123 is the Solar Forecast api down? Since last night I’m no longer getting data, api gives error, graph shows everything with 01/01 01.00… have tried restarting the app and rebooting Homey. Solcast still works… ---
**Author:** ![Snappy](https://sea1.discourse-cdn.com/flex025/user_avatar/community.homey.app/snappy/32/29344_2.png) [@Snappy](https://community.homey.app/u/Snappy)\ **Post date:** [September 15, 2026, 9:06pm UTC](https://community.homey.app/t/app-pro-solar-forecasts-solcast-forecast-solar/46842/382 "2026-09-15T21:06:46Z")
On Solcast app, I only get an API error since september 4th. Direct API call in browser works, so looks like the app is broken. Have the same issue on two different Homeys with different Solcast accounts. ---
**Author:** ![Sharkys](https://sea1.discourse-cdn.com/flex025/user_avatar/community.homey.app/sharkys/32/54029_2.png) [@Sharkys](https://community.homey.app/u/Sharkys)\ **Post date:** [September 16, 2026, 4:30am UTC](https://community.homey.app/t/app-pro-solar-forecasts-solcast-forecast-solar/46842/383 "2026-09-16T04:30:12Z")
It still works for me fine. [Previous page](https://community.homey.app/t/app-pro-solar-forecasts-solcast-forecast-solar/46842.md?page=18) [Next page](https://community.homey.app/t/app-pro-solar-forecasts-solcast-forecast-solar/46842.md?page=20)