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Free app: run the immersion / heat pump from Growatt battery & solar surplus – no Home Assistant

 
Solar Photovoltaic (PV)
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 kaloyan.yonov
(@kaloyan-yonov)
New Member Member
Joined: 17 hours ago
Posts: 1
Topic starter 27/10/2026 6:35 pm   [#3211]

Hi all,

Full disclosure: I'm the developer; it's a free beta and there's nothing to sell.

I built a small web app to tie a Growatt inverter together with the rest of the house: switch the immersion heater on only when the battery is full, charge from the grid during the cheap window, and keep an eye on the heat pump – without setting up Home Assistant.

  • Logs in to Growatt with the ShinePhone username/password – no extra hardware
  • Live SOC, PV per string, load and grid import
  • Smart Life / Tuya plugs and switches, LG Therma V heat pumps, Gree/Toshiba/Daikin/LG/SmartThings air conditioners
  • Rules such as "SOC ≥ 90% and PV ≥ 2 kW → immersion ON" or "00:30–04:30 → charge Solar + Utility"
  • Heat pump protection (minimum time between on/off), email alerts if something stops responding

90-second demo:

Demo without signing up: https://home-hub-beta.home-hub-1.workers.dev/demo

Limitations: Growatt data comes via their cloud (1–5 min delay); mostly tested on SPF/SPE models. Beta – use at your own risk. Feedback welcome!



   
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Majordennisbloodnok
 Majordennisbloodnok
(@majordennisbloodnok)
Famed Member Moderator
Joined: 5 years ago
Posts: 2190
28/10/2026 10:13 am  

Please bear in mind, everyone, that in order to use this app you will have to enter your Growatt username and password into a third party app whose trustworthiness is completely unknown. That's a significant security concern.

@kaloyan-yonov, I'm not questioning your integrity but you are an unknown and it is an important habit to question any instance where you are being asked to divulge personal information. Since the integrity of apps and online services varies wildly I think it's important that our members have this aspect made clear so they can make an informed decision.


105 m2 bungalow in South East England
Mitsubishi Ecodan 8.5 kW air source heat pump
18 x 360W solar panels
1 x 6 kW GroWatt battery and SPH5000 inverter
1 x Myenergi Zappi
1 x VW ID3
Raised beds for home-grown veg and chickens for eggs

"Semper in excretia; sumus solum profundum variat"


   
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