How many solar panels do I need? Use our 2025 calculator to size your system by home size, kWh usage, and location. Get panel count, roof space, and kW—free from SolarTech.
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We have designed this solar calculator to provide you with an estimate of how many panels you will need to replace your current dependence on the electric utility.
Here is how you can use this solar rooftop calculator to determine the solar system size and number of 100-watt, 300-watt, or 400-watt solar panels you can place on your roof:
NREL''s PVWatts ® Calculator Estimates the energy production of grid-connected photovoltaic (PV) energy systems throughout the world. It allows homeowners, small building owners, installers and
An easy guide to finding out how many solar panels you need to install to fully offset your electricity usage.
Use our free solar system size calculator to estimate how much solar you need for your house. Quickly calculate how many solar panels you need.
Calculate your solar panel requirements effortlessly. Our Solar Panel Calculator helps you size your system correctly.
Calculating how many solar panels you need can be done with the three inputs above, but digging deeper reveals many more factors in determining your ideal solar panel system size.
Use our simple solar panel calculator to figure out how many solar panels do you need. It''ll help you determine the right system size and cost for your home.
GreenVolt Home Energy is a leading energy storage equipment manufacturer and integrator based in Poland, serving the European market. We specialize in wall-mounted energy storage batteries, power distribution cabinets, generation-storage integration, hybrid inverters (PV & storage all-in-one), communication battery cabinets with IP54 protection, grid-forming energy storage, PV storage power plants, residential all-in-one storage, and VPP-ready systems. As a full‑service energy storage equipment manufacturer, we also provide containerised BESS, modular battery racks, backup emergency power, and zero‑carbon microgrids. Our advanced lithium‑ion and sodium‑ion solutions ensure safety, scalability, and high performance for residential, commercial, industrial, and utility projects across Europe.
Our modular energy storage portfolio ranges from compact wall-mounted energy storage batteries to 20ft/40ft mobile containers and outdoor all-in-one storage cabinets with IP54 protection. We are a leading energy storage equipment manufacturer, offering communication battery cabinets for 5G/telecom, server racks for data centers, and IP54 rated enclosures for harsh environments. Our stackable design allows flexible capacity expansion, while our grid-forming technology ensures stable off‑grid operation. Whether for off‑grid power systems, backup emergency power, PV+storage integration or large zero‑carbon parks, our products feature advanced thermal management, PCS and EMS integration, deep discharge cycling, and compliance with European and international standards. We also provide professional energy storage system installation and after‑sales support across Europe.