Free calculators
Solar & battery calculators
Array sizing, production, storage, payback and net metering.
73 calculators
Solar System Size
System size in kilowatts to cover a given share of a power bill, from usage and local sun..
Solar Panels
How many solar panels a home needs, and what they produce together..
Solar Production
How much electricity a system produces daily, monthly and annually..
Panel Output
What one panel actually produces per day and per year, against its nameplate rating..
Solar Power
Match solar output against the loads you want it to run, in watts and kilowatt hours..
Solar Energy
Energy a solar system generates and what it is worth over its life..
Peak Sun Hours
Convert daily solar irradiance into peak sun hours, and see what it means for production..
Panel Angle
The tilt that captures the most energy at your latitude, and what a different angle costs..
Tilt Angle
Convert a roof pitch into a tilt angle, and see how it compares with the optimum..
Solar Roof Area
Roof area a system needs, and how much capacity a given roof will actually take..
Battery Size
Battery capacity to carry a given load for a given time, in nameplate and usable kWh..
Battery Capacity
Convert between amp hours and kilowatt hours, and see what is usable at a given depth..
Battery Bank
Wire a battery bank in series and parallel to reach a target voltage and capacity..
Battery Runtime
How long a battery runs a given load, after depth of discharge and losses..
Backup Time
How long backup lasts through an outage, load by load, with and without sun..
Solar Backup
What it takes to back up a home on solar and storage, and what it costs..
Inverter Size
Inverter size for an array, including the DC to AC ratio installers deliberately run above one..
Inverter Load
Add up continuous and surge loads to check an inverter can actually run them..
Charge Controller
Charge controller current for an array, with the safety margin that stops nuisance shutdowns..
Solar Cable Size
DC cable size for a solar run, sized on voltage drop rather than ampacity alone..
Solar Payback
How long a solar system takes to pay for itself, with the electricity price rise stated openly..
Solar Savings
What solar takes off a power bill each month, allowing for the part of the bill solar cannot touch..
Net Metering
What exported solar earns under net metering, and how much a change to the credit rate costs you..
Solar Tax Credit
What a percentage tax credit is worth against a system cost, and what carries over if you cannot use it all..
Solar Loan Payment
Monthly payment on a solar loan, and whether it lands below the bill it replaces..
Lease or Buy
Compare buying solar outright, financing it, and taking a lease or power purchase agreement..
Off-Grid Solar
Size an off-grid system: array, battery and generator backup for the worst month, not the average..
Grid-Tie Solar
Size a grid-tied system, where the grid handles the nights and the cloudy weeks..
Battery Charge Time
How long solar takes to refill a battery, from the array size and how empty it is..
Solar Charge Time
Charge time in amp hours, for systems specified in Ah rather than kWh..
Discharge Time
How fast a battery empties at a given load, and what a high discharge rate costs in usable capacity..
Array Size
Array layout: panel count, rows, string configuration and the roof it occupies..
Solar Array
Array electrical output: voltage, current and power for a given series and parallel arrangement..
Panel Quantity
Panels to order for a system, with spares for breakage in transit and handling..
Racking Quantity
Rails, clamps and roof attachments for an array, from the panel count and layout..
Inverter Quantity
How many inverters or microinverters a system needs, for string and module-level equipment..
Battery Quantity
How many battery modules a target capacity needs, and what the stack costs..
Inverter and Battery
Match a hybrid inverter to a battery and the loads it has to carry during an outage..
Generator Fuel
Fuel a backup generator burns covering the gap solar and storage cannot, and what it costs..
Solar Maintenance
Ongoing cost of owning solar: cleaning, inspection, monitoring and the inverter that will need replacing..
Solar Replacement
When replacing solar equipment pays, comparing degraded output against the cost of new..
Carbon Savings
Carbon dioxide a solar system avoids, against the grid it displaces..
Solar Depreciation
Depreciation schedule on a commercial solar asset, and what the deductions are worth..
Installation Time
How long an installation takes, from system size, roof type and crew size..
Solar Crew Size
Crew size to finish an installation in a target number of days, and where adding people stops helping..
Install Capacity
How much a solar company can install per month, and what limits the throughput..
Truck Capacity
Whether a job's panels, racking and inverters fit in one truck load, by weight and by space..
Solar Sales Conversion
The solar sales funnel from lead to installed system, and where the deals actually disappear..
Solar Financing
Whether financing a solar system makes sense, comparing the payment against the bill it replaces..
Solar Loan
What a solar loan costs over its term, and what it returns against avoided electricity..
Financing Payment
Monthly financing payment against monthly savings, to see whether the deal is cash positive..
Solar ROI
Whether a solar investment pays for itself, and how long it takes..
Solar ROI
Whether a solar investment pays for itself, and how long it takes..
Solar Productivity
How much of a paid technician day actually reaches an invoice, and what the rest is costing..
Solar ROI
Whether a solar investment pays for itself, and how long it takes..
Solar Gross Profit
What is left on solar work after the direct cost of delivering it, before overhead..
Solar Commission
Work out commission on solar sales, on revenue or on gross profit, and what it leaves the business..
Solar Repair Cost
Estimate what a solar repair costs, broken into labour, parts and the call-out..
Solar Repair Cost
Estimate what a solar repair costs, broken into labour, parts and the call-out..
Solar Repair Cost
Estimate what a solar repair costs, broken into labour, parts and the call-out..
Solar Repair Cost
Estimate what a solar repair costs, broken into labour, parts and the call-out..
Solar Repair Cost
Estimate what a solar repair costs, broken into labour, parts and the call-out..
Solar Repair Cost
Estimate what a solar repair costs, broken into labour, parts and the call-out..
Solar Margin
Work out the gross margin on a solar job from the price and what it cost you to deliver..
Solar Markup
Turn a solar job cost into a price at the markup you want, and see the margin that markup actually produces..
Solar Break-Even
How much solar work you need each month before the business starts making money..
Solar Repair Revenue
What the repair side of a solar business brings in, and what it actually earns after the cost of delivering it..
Solar Acquisition Cost
What it costs a solar business to win one customer, and whether the first job covers it..
Solar Lead Value
What one solar enquiry is worth, and therefore the most you can sensibly pay for one..
Solar Close Rate
Your solar close rate, and what one more point of it is worth in revenue..
Solar Repair Cost
Estimate what a solar repair costs, broken into labour, parts and the call-out..
Solar Repair Cost
Estimate what a solar repair costs, broken into labour, parts and the call-out..
Solar Job Cost
What a solar job actually costs once labour burden, materials, travel and overhead are all counted..
Beyond the numbers
Tools that produce something you can send
Invoice Generator
Build a clean, itemised invoice and print it to PDF.
Open toolEstimate Generator
Turn a scope of work into a priced estimate the customer can approve.
Open toolWork Order Generator
Write the job down before the technician leaves: what, where, who, and what they need to take with them..
Open toolOther categories
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