HTHOMETALLYTHE PRACTICAL HOME GUIDE

Independent energy/ CALCULATOR

Solar array energy balance

Estimate DC array size from daily energy and a monthly solar assumption.

Use the essential-load budget for an outage scenario.
Location- and month-specific equivalent full-sun hours.
Assumed losses; adjust to the modelled system.
Use the DC nameplate rating of the exact module being considered.
Use module dimensions only; installation clearances and access need additional area.
Indicative required array

2.56 kW DC

Minimum whole panels

6 panels

Selected-panel array rating

2.70 kW DC

Module surface area

12.6 m²

Interpretation:The energy estimate rounds up to 6 selected panels, rated 2.7 kW DC and occupying 12.6 m² of module surface. Confirm roof layout, structure and inverter limits separately.

First-pass average energy balance only. Panel count rounds upward. Module area excludes gaps, setbacks, access, mounting and unsuitable roof zones. No weather-sequence simulation, battery recovery allowance, inverter sizing, structural check or reliability guarantee. Yield factor is a user assumption, not a product rating.

FROM ESTIMATE TO ACTION

Use the result, not just the number.

01

Verify the inputs

Measure or document each input. If a value is only an estimate, record its source and test a conservative alternative.

02

Keep the calculation traceable

Save the input link or copied result together with the date, units and assumptions. A number without its inputs cannot be checked later.

03

Confirm the decision

Compare the estimate with the related guide, current product data and requirements that apply at your location before buying or building.

Inputs to verify

Daily AC energy demand (kWh/day)
Use the essential-load budget for an outage scenario.
Peak sun hours (h/day)
Location- and month-specific equivalent full-sun hours.
Overall yield factor (%)
Assumed losses; adjust to the modelled system.
Selected panel rating (W/panel)
Use the DC nameplate rating of the exact module being considered.
Area per panel (m²/panel)
Use module dimensions only; installation clearances and access need additional area.

Continue your calculation

Independent energy

Daily electricity budget

Add three appliance groups using power and actual daily running time.

Independent energy

Battery autonomy

Convert a daily load into nominal battery capacity with stated losses.

Independent energy

Battery autonomy after load shedding

Compare battery runtime before and after reducing the daily critical-load budget.