SOLAR SYSTEM SIZE CALCULATOR

Build A Smarter
Solar Starting Point.

Answer a few simple questions and get a practical estimate for daily energy use, solar panel size, battery storage, inverter capacity, and recommended system type.

LOAD HELPER

Find Watt-Hours From A Nameplate

If you do not know an appliance’s wattage, check the label or rating plate. Many appliances show volts, amps, and hertz instead of watts.

Enter the volts, amps, and estimated hours per day below. You can then use the estimated wattage and daily watt-hours in the appliance list.

Example Nameplate Voltage: 120V
Current: 5A
Frequency: 60Hz
Estimated Wattage 600 W
Estimated Daily Use 4,800 Wh
Hertz is commonly shown on appliance labels, but it is not needed for this estimate. Many appliances also cycle on and off, so the rating plate may show maximum draw rather than average daily use.

Choose Your Setup

Start with the closest use case. Each option loads common appliances for that situation, then you can fine-tune wattage, voltage, quantity, and runtime.

What Are You Powering?

Choose the closest starting point. You can adjust every appliance and setting before reviewing your estimate.

Adjust wattage, voltage type, quantity, and hours per day to better reflect your actual use.

240V appliances such as dryers, well pumps, HVAC units, and electric water heaters can significantly increase system size.
80% efficiency is used as the default planning value. Some systems may perform lower or higher depending on equipment quality, wiring, panel placement, charging losses, inverter use, temperature, and shading.
YOUR ESTIMATE

System Breakdown

Your estimate updates live as you choose a setup, edit appliances, and adjust system settings.

Daily Consumption 0 Wh
Recommended Solar Panel Array 0 W
Recommended Battery Capacity 0 Wh
Estimated Battery Amp Hours 0 Ah
Recommended Inverter Size 0 W
Recommended System Type Small
01

Daily Consumption

This is the total watt-hours your appliances use in one day. Larger home loads and 240V equipment can raise this number quickly.

02

Solar Panel Size

Your solar estimate is based on daily energy use, available peak sun hours, and efficiency losses.

03

Battery & Inverter

Battery size estimates storage needs. Inverter size estimates the power required to run your selected appliances.

RECOMMENDATIONS

What These Results Mean

Use your system tier as a starting point. A true home backup system can require much more capacity than a portable emergency setup, especially if you plan to support 240V appliances, HVAC, well pumps, dryers, or electric water heaters.

Portable Backup

Best for phones, WiFi, lights, laptops, fans, and small emergency loads.

Essential Backup

Better for refrigerators, freezers, routers, lights, sump pumps, and short outages.

Home Backup

Designed for larger appliances, essential circuits, bigger batteries, and longer backup times.

Whole-Home / Off-Grid

Best for high daily usage, 240V loads, long-term backup, or complete off-grid living.

NEED HELP?

Want Us To Review Your Estimate?

Send your calculator results to our team and we can help point you toward compatible solar panels, batteries, inverters, power stations, or complete backup systems.