Assumptions

  • Pitch of 45 degrees or 12/12
  • Panels facing due South
  • 5% annual fuel cost escalation (20 year period)
  • 60L of domestic hot water per person per day
  • Electrical heating efficiency 85%
  • All other seasonal heating efficiency is 70%
  • Climate data from Shearwater
  • $6,200 for 1-panel system
  • $7,200 for 2-panel system
  • $3,750 of rebate from 3 different rebates (check rebates applicability)