# Newbie: dynamic contract + solar +battery +heat accumulators +boiler +PHEV +smart thermostat

**URL:** <https://community.homey.app/t/newbie-dynamic-contract-solar-battery-heat-accumulators-boiler-phev-smart-thermostat/131479>\
**Category:** Energy\
**Created:** [February 24, 2025, 1:02pm UTC](https://community.homey.app/t/newbie-dynamic-contract-solar-battery-heat-accumulators-boiler-phev-smart-thermostat/131479 "2025-02-24T13:02:48Z")\
**Posts on this page:** 1\
**Showing post:** 4

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**Author:** ![Peter\_Kawa](https://sea1.discourse-cdn.com/flex025/user_avatar/community.homey.app/peter_kawa/32/173848_2.png) [@Peter\_Kawa](https://community.homey.app/u/Peter_Kawa)\
**Post date:** [March 19, 2025, 10:42pm UTC](https://community.homey.app/t/newbie-dynamic-contract-solar-battery-heat-accumulators-boiler-phev-smart-thermostat/131479/4 "2025-03-19T22:42:24Z")

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I agree with RMB, this is very complex to build.  
Usually this is how it works: you show the flow(s) you could come up with, and we can help improve and/or share ideas on how to proceed

> [@Tanguy\_Legrand](#):
>
> what app is the best to use to predict the solar production

> [@\[APP\]\[Pro\] Solar Forecasts (SolCast + Forecast.Solar)](https://community.homey.app/t/app-pro-solar-forecasts-solcast-forecast-solar/46842):
>
> Solar Forecasts Homey app using the Solcast API or Forecast.Solar to get solar forecasts customized for your location and installation Links You can download the app here: [Solcast](https://homey.app/nl-be/app/com.solcast/Solcast/)Usage You could use the app to switch on electric appliances or charge a car or battery based on the forecast solar power, to maximize self-consumption. You can compare the daily forecast with your actual production. Solcast Setup Sign up your solar installation at [Solcast Toolkit](https://toolkit.solcast.com.au/live-forecast) You have to setup the …

> [@Tanguy\_Legrand](#):
>
> -can Homey/the smart thermostat “calculate/adjust/learn” how much we need to charge the heat-accumulators at night in order to have a good temperature during the next day?

Homey can calculate “anything” you like.  
But _how_ to calculate this, is out of my league

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