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Solar & battery calculators

Array sizing, production, storage, payback and net metering.

Solar & battery guides

73 calculators

Solar System Size

Sizes an array from annual consumption, where the derate factor does the real work..

Solar Panels

Works out how many modules a target output needs, where the roof usually decides..

Solar Production

Estimates annual production, where location and orientation matter more than the hardware..

Panel Output

Works module output, where the temperature coefficient explains the summer shortfall..

Solar Power

Works instantaneous power against energy, which are different quantities..

Solar Energy

Works energy over time, which is what bills and sizing are both measured in..

Peak Sun Hours

Works peak sun hours, which is a solar resource figure rather than hours of daylight..

Panel Angle

Works array angle, where orientation usually matters more than tilt..

Tilt Angle

Works tilt against seasonal production, where the choice depends on which season matters..

Solar Roof Area

Works the usable roof area, which is well below the measured roof..

Battery Size

Sizes a battery, where usable capacity and nameplate capacity are different..

Battery Capacity

Works battery capacity in amp hours and kilowatt hours, where the voltage links them..

Battery Bank

Configures a battery bank, where matching the units matters as much as the total..

Battery Runtime

Works how long a battery runs a load, after the losses..

Backup Time

Works backup duration, where deciding what to back up is the real design..

Solar Backup

Sizes a backup system, where power and energy are separate requirements..

Inverter Size

Sizes an inverter, where a ratio slightly above the array is usually deliberate..

Inverter Load

Works inverter loading, where continuous and surge capability are different numbers..

Charge Controller

Sizes a charge controller, where cold weather voltage sets the limit..

Solar Cable Size

Sizes cable, where voltage drop usually governs rather than ampacity..

Solar Payback

Works payback, where the assumptions about rates and incentives carry the result..

Solar Savings

Works bill savings, where the tariff structure matters more than the production..

Net Metering

Works net metering, where the tariff rather than the physics decides the value..

Solar Tax Credit

Works the value of a solar tax credit, where current eligibility has to be confirmed first..

Solar Loan Payment

Works a solar loan payment, where dealer fees are inside the price..

Lease or Buy

Compares leasing against buying, where ownership of the incentives is the difference..

Off-Grid Solar

Sizes an off-grid system, where the worst month rather than the average governs..

Grid-Tie Solar

Sizes a grid-tied system, where the tariff and the interconnection rules set the limits..

Battery Charge Time

Works charge time, where the final stage takes far longer than the arithmetic suggests..

Solar Charge Time

Works charge time from a solar array, where available sun rather than array size limits it..

Discharge Time

Works discharge time, where the discharge rate affects the capacity available..

Array Size

Sizes an array against a target, where the derate separates nameplate from energy..

Solar Array

Configures an array, where string design is constrained at both voltage limits..

Panel Quantity

Works module quantity, where string configuration constrains the count..

Racking Quantity

Works racking quantities, where the attachment count follows the load calculation..

Inverter Quantity

Works inverter quantities, where the architecture decides the count..

Battery Quantity

Works battery quantities, where the configuration constrains the count..

Inverter and Battery

Matches inverter and battery, where both power and energy have to agree..

Generator Fuel

Works generator fuel for a hybrid system, where run hours drive consumption..

Solar Maintenance

Works maintenance cost over a system's life, where inverters dominate it..

Solar Replacement

Works replacement cost and timing for the components that do not last the system's life..

Carbon Savings

Works avoided emissions, where the regional grid factor decides the answer..

Solar Depreciation

Works depreciation on a business solar installation, where the rules need a professional..

Installation Time

Estimates install time, where the electrical work and the roof conditions dominate..

Solar Crew Size

Works crew size, where the tasks are not equally divisible..

Install Capacity

Works how much an installer can deliver, where permitting rather than labour is the bottleneck..

Truck Capacity

Works what a vehicle can carry, where weight binds before volume..

Solar Sales Conversion

Measures the solar sales funnel, where the stages after signing also lose jobs..

Solar Financing

Compares financing options, where the total cost rather than the payment is the comparison..

Solar Loan

Works a solar loan, where the term choice trades payment against total interest..

Financing Payment

Works the payment under a financing structure, where step-ups need checking..

Inventory Cost

Works the cost of holding solar inventory, where obsolescence is the real risk..

Solar ROI

Works a simple payback, where the assumptions deserve more attention than the arithmetic..

Solar ROI

Works return on a solar investment, where the period and the assumptions have to be stated..

Solar Productivity

Works module efficiency, which is about area rather than energy per dollar..

Solar ROI

Works return on storage, where the value depends on what the battery is for..

Solar Gross Profit

Works profit on an installation, where the electrical work and the surprises decide it..

Solar Commission

Works sales commission, where paying on signed contracts creates the wrong incentive..

Solar Repair Cost

Builds a proposal, where the assumptions shown decide whether the customer was told the truth..

Solar Repair Cost

Builds system cost from components, where the soft costs are a large share..

Solar Repair Cost

Works installer labour cost, where the burden and the licensed trades matter..

Solar Repair Cost

Works installed cost, where what the quote excludes decides the final figure..

Solar Repair Cost

Builds an install estimate, where the survey determines whether it holds..

Solar Repair Cost

Builds a quote, where what is written down prevents the dispute..

Solar Margin

Works installer margin, where equipment's share limits how much there is to work with..

Solar Markup

Works markup against margin, where the two are routinely confused..

Solar Break-Even

Works the installs needed to cover an installer's fixed base..

Solar Repair Revenue

Projects installer revenue, where the pipeline stages set the ceiling..

Solar Acquisition Cost

Works what a solar customer costs, where the cost per install exceeds the cost per sale..

Solar Lead Value

Works what a solar lead is worth, where two conversion stages apply..

Solar Close Rate

Measures close rate, where qualifying before the proposal protects the design time..

Solar Repair Cost

Works material cost, where current pricing matters more than any formula..

Solar Job Cost

Builds total job cost, where the site-specific items separate jobs of the same size..

Beyond the numbers

Tools that produce something you can send

Invoice Generator

Build a clean, itemised invoice and print it to PDF.

Open tool

Estimate Generator

Turn a scope of work into a priced estimate the customer can approve.

Open tool

Work Order Generator

Write the job down before the technician leaves: what, where, who, and what they need to take with them..

Open tool

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