Compare price and performance of the Top Brands to find the best 4 kW solar system. Buy the lowest cost 4kW solar kit priced from $1.36 to $2.25 per watt with the latest, most powerful solar panels, module optimizers, or micro-inverters. For home or business, save 30% with a solar tax credit.
CLICK ON A SOLAR KIT to review parts list, specifications, and prices for DIY or FULL-SERVICE installation.
What You Get with Every PV System
Solar panels, inverters, roof mounting, cables, BOS
14 to 16 panels generate 500 kWh / mo (varies)
UL Certified with up to 30 year manufacturer warranty
Mount on rooftop or ground (optional); up to 300 sf
Flat-rate shipping with lift-gate service to continental U.S.
FreeCleanSolar has a big selection of affordable 4 kW PV systems for sale. These 4 kW size grid-connected solar kits include solar panels, DC-to-AC inverter, rack mounting system, hardware, cabling, installation instructions and optional permit plans. These are complete PV solar power systems that can work for a home or business, with just about everything you need to get the system up and running quickly. The kit prices shown include hardware components only; click on any kit to add your choice of full-service installation options for rooftop or ground mount.
A 4kW Solar Kit requires up to 300 square feet of space. Ideal output will be achieved with an unobstructed south-facing view of the sun for maximum solar power. 4kW or 4 kilowatts is 4,000 watts of DC direct current power. This could produce an estimated 300 to 750 kilowatt hours (kWh) of alternating current (AC) power per month, assuming at least 5 sun hours per day with the solar array facing South. The actual power generated will vary based on location, equipment and installation factors. Refer to your electric utility bill to find the actual kWh used per month and compare it to how much power these low cost 4kW PV systems can generate.
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