HB TECH PROSHB‑01BOOK AN INSTALL
Power Calculators

Solar System Sizing Calculator

Enter your loads and get a planning-grade estimate for your battery bank, solar panel count, and inverter size.

This calculator works through the same four steps a real installer uses: your daily load, how much battery you need to store it, how many panels it takes to refill that battery, and what size inverter moves it all safely. Check off your devices, set a few system details, and get a ballpark you can use to compare options and budget with. Not sure how the math works? Read How to Size a Solar Power System first.

This is a planning estimate, not a wiring diagram. Your exact panel wiring, inverter model, and equipment ratings still need to be checked against real datasheets, ideally with a local installer, before you buy or install anything.

Your electrical grid
How many cloudy days in a row you want to cover without sun.
Affects how much of the battery's capacity is safe to use.
Typically 3-4 in cloudy climates, 4-5 across most of the US, 5-6+ in sunny/desert regions. Check a solar resource map for your area.
The panel size you're planning to use for the array.
System losses (wiring, temperature, inverter conversion)
20%

Select Your Devices to Get Started

Check off everything you want to power, then adjust the quantity, watts, or hours if yours are different.

Device Qty Watts Hrs/Day Wh/Day
Add your own device
DAILY ENERGY USE
0Wh
0.00 kWh/day
This is the load basis used for every calculation below. See What Is a Watt-Hour?
Safety buffer
20%
Total power needed, per day with 20% buffer
0 Wh
This is not a discount on your battery's rated capacity. It sizes a bigger battery and array than your raw total, so daily use only draws down part of it, covering inverter conversion loss and keeping the battery healthier long term. Battery and array sizing below use this buffered figure; inverter sizing is based on your actual device wattages, not the daily buffer.
Select devices or add a custom load to begin.
Watts and hours are editable for every device.

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