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Solar + storage payback

Estimate how long a solar, inverter and battery system could take to recover its cost using your local prices.

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See the full results without leaving your contact details. Inputs stay in this browser tab; solar coordinates are sent to PVGIS for the estimate.

Estimates from the previous steps

Home use per day (kWh): 10 kWh
Your selected battery: No storage battery
Potential DC array size: —
Panel count: — × 450 W
Household electricity used in daytime (%): 40%
Automatically matched inverter: Other / not selected

Previous step is incomplete. Go back or enter your own values here.

Edit solar estimate →Edit battery selection →

Assumptions

Annual generation (kWh)Home use per day (kWh)

Manual annual generation is spread evenly by day. Importing solar preserves seasonal variation.

CurrencyReference quotations are in CNY. Enter matching unit prices and tariffs for other currencies; there is no automatic conversion.

Grid purchase price / kWhExport payment / kWh

Equipment & costs

Adjust assumptions · Equipment & costs

Battery model

Battery nominal capacity (kWh)Battery unit price (CNY)

Automatically matched inverterOther / not selected

Inverter unit price (CNY)

Panel quantityPower per panel (W)

PV pricing unitPV module unit price / W (CNY)

Installed cost method

No storage battery ×1: —
Other / not selected ×1: —
Panel count: — × 450 W: —
Equipment subtotal: —
Installation · 20%: —
Estimated installed total: —

Installation is 20% of the final installed total. Total = equipment ÷ 0.8; installation = total − equipment.

Enter missing unit prices and panel quantity to calculate the installed total.

Battery website reference prices and LANTUVIA inverter/PV quotations. Delivery, tax and extra work are confirmed in the final quote.

Adjust assumptions

Household electricity used in daytime (%)40% is an editable timing assumption. Direct solar supply is capped by estimated average daily generation; weather and actual load timing affect results.Full equivalent charging days / yearBattery round-trip efficiency (%)Usable battery capacity (%)Upfront subsidyAnnual maintenance costPV degradation / year (%)Analysis period (years)Equipment replacement costReplacement year

Estimated payback

Enter generation, usage, rates and installed cost to calculate payback.

How this is calculated

Installation is 20% of the final installed total. Total = equipment ÷ 0.8; installation = total − equipment.

Monthly energy balance: direct solar is the lower of household use × daytime share and generation. Battery supply is limited by remaining demand, surplus, capacity, efficiency and cycles. Includes installation, maintenance, replacement and PV degradation.

A preliminary energy-budget estimate, not a performance or return guarantee. Defaults are editable scenarios, not measured values. Tariffs are held constant. Loans, discounting, tax credits, tariff tiers, seasonal dispatch and battery degradation are not modelled. A zero export rate represents no export revenue.

System Advisor Model →

Adjust assumptions

Common questions

Is the battery capacity an exact recommendation?

This is an energy estimate based on the listed appliance assumptions or your measured daily consumption. It does not confirm simultaneous load or starting power.

Does roof area guarantee the panel count?

This estimates physical space only. Roof strength, setbacks, row spacing, obstacles and electrical design require a site survey.

Will the system definitely pay for itself?

No. Costs, weather, usage and local billing rules affect the result. Enter your own quotation and compare the sensitivity scenarios.