WEM SOLAR CALCULATOR

Turn three electricity bills into a clear solar starting point.

Enter the amount from each of your last three bills and the customer's local average electricity rate, then choose On-grid or Hybrid and your preferred panel wattage for an instant preliminary project plan.

Customer-selected design allowance On-grid or Hybrid 620W, 680W, or 720W panels

YOUR ELECTRICITY USE

Enter bills and the local rate

Use the total current charges before late-payment fees, reconnection fees, or old unpaid balances.

Most recent billMonth 1

₱

Previous billMonth 2

₱

Third billMonth 3

₱

LOCAL RATE BASIS — REQUIREDAverage electricity rateElectricity rates vary by utility, service area, and billing period.

₱/ kWh

Use the average effective rate shown on the bills. If it is not shown, divide the total current energy charges across all three bills by their total kWh consumption.

SYSTEM SIZING — OPTIONALDesign allowanceChoose how much extra solar capacity to add above the estimated base requirement.

Starts at 30%. Enter 0 or leave this optional field blank to apply no additional allowance.

Choose the solar system type

On-gridGrid-tie system without battery storageHybridIncludes one standard 314Ah battery pack

Choose your panel wattage

620WFlexible layout680WBalanced choice720WFewer panels

Calculation assumptions

The customer-entered local rate above is used to estimate kWh consumption and savings; no national default rate is assumed. The selected optional design allowance is added after estimating the base requirement. The model uses 4.5 peak-sun-hours per day and an 80% system performance ratio.

YOUR RECOMMENDATION WILL APPEAR HERE

Add three bills and the local rate.

The result uses the entered ₱/kWh rate and optional allowance as its local basis and updates automatically when any input changes.

READY FOR A VERIFIED DESIGN?

Let WEM check the roof, electrical service, and actual daytime load.

Send the three complete bills and site location. The final proposal is issued only after technical review, product confirmation, and a proper quotation.

Request a site assessment