Use the BatteryStuff rule: 1 Amp AC ≈ 10 Amps DC. Add ~10% for inverter losses, then compute DC watts as DC amps × system voltage (commonly 12 V). Track each device by hours per day to get daily watt‑hours and amp‑hours.
Learn the 59 essential solar calculations and examples for PV design, from system sizing to performance analysis. Empower your solar planning or education with SolarPlanSets.
Solar panels should be mounted at a height of 3. 25″ from the roof's surface to ensure optimal performance. This measurement takes into account the seam of the SSMR, typically 1. 5″ to 3″ in height, the mounting hardware, adding approximately ¾” and the module frame .
List each device → note its power (W) → estimate daily run‑time (hours) → compute Wh = W × hours → convert to kWh (Wh ÷ 1,000) and sum. Add 10–20% for “phantom”/future loads. Example (lean 2‑bed prefab): Look at the last 12 utility bills and note the highest‑use months (kWh).
Click Show Angle Visualizer to see your panels in action. The side-view diagram shows your panel at different tilt angles, with summer and winter sun paths arcing overhead.