Compare calculators
Both calculators run independently — change the inputs on either side to compare results.
Solar Water Heater Savings Calculator
Estimates annual energy savings from a solar water heater based on household size, fuel type, solar fraction. Use it when comparing solar thermal to conventional water heating costs.
Annual Savings
668.14 $
167.04: $140-220/person is typical when replacing electric resistance heating (2.8 factor), the most expensive fuel to offset and the fastest payback.
This is annual water-heating savings per person; per-capita savings depend heavily on displaced fuel, since electric resistance heating costs far more than gas to offset.
Optimal Solar Panel Angle Calculator
Estimates the optimal fixed tilt angle for a solar panel based on your latitude and the season you want to optimize for. Useful for fixed-tilt mounting decisions, seasonal-adjustment planning, and rough-design sizing for off-grid systems.
Key differences
| Solar Water Heater Savings Calculator | Optimal Solar Panel Angle Calculator | |
|---|---|---|
| Category | Solar Energy | Solar Energy |
| Inputs required | 3 | 2 |
| Result | Annual Savings ($) | Optimal Tilt Angle (degrees) |
| What it does | Estimates annual energy savings from a solar water heater based on household size, fuel type, solar fraction. Use it when comparing solar thermal to conventional water heating costs. | Estimates the optimal fixed tilt angle for a solar panel based on your latitude and the season you want to optimize for. Useful for fixed-tilt mounting decisions, seasonal-adjustment planning, and rough-design sizing for off-grid systems. |