{
  "PV": {
    "efficiency": 0.2,
    "noct_C": 45,
    "I_ref_W.m-2": 800,
    "kappa_K-1": 0.0045,
    "T_ref_C": 25,
    "surface": 10
  },

  "HotWater": {
    "efficiency": 0.9,
    "legal_T_C": 60,
    "consumption_T_C": 40,
    "people_number": 4,
    "daily_demand_per_person": 30
  }
}