4 kW Solar Kits

4 kW Solar Kits

  • Trina 310 SMA Inverter Solar Kit
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    4.3kW solar kit Trina 310, SMA inverter

    Trina Solar

    $6,100.00
    This high-efficiency Trina Solar power system generates 4.3kW (4340 watts) of grid-tied electricity with 14 Trina 310 watt monocrystalline all-black modules, SMA Sunny Boy inverter with emergency power supply, Sunny Portal 24/7 monitoring, disconnect...
    TSM310-4KW-SMA
    $6,100.00
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  • Axitec 320 Solar Kit with SMA Inverter
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    4.4kW solar kit Axitec 320, SMA inverter

    Axitec Solar

    $6,150.00
    This Axitec Solar power system generates 4.4kW (4480 watts) of grid-tied electricity with 14 Axitec 320 watt monocrystalline modules, SMA Sunny Boy inverter with emergency power supply, Sunny Portal 24/7 monitoring, disconnect box, rooftop mounting,...
    AXI320-4KW-SMA
    $6,150.00
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  • Q.Cells 320 Solar Kit with SMA Inverter
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    4.4kW solar kit Q.Cells 320, SMA inverter

    Q CELLS

    $6,350.00
    This high-power Q Cells solar energy system generates 4.4kW (4480 watts) of grid-tied electricity with 14 Q Cells 320 watt monocrystalline all-black modules, SMA Sunny Boy inverter with emergency power supply, Sunny Portal 24/7 monitoring, disconnect...
    QC320-4KW-SMA
    $6,350.00
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  • Mission 310 Solar Kit with SMA Inverter
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    4.3kW solar kit Mission 310, SMA inverter

    Mission Solar Energy

    $6,450.00
    This high-power PV energy system generates 4.3kW (4340 watts) of grid-tied electricity with 14 Mission 310 watt monocrystalline all-black modules, SMA Sunny Boy inverter with emergency power supply, Sunny Portal 24/7 monitoring, disconnect box, rooftop...
    MSE310-4KW-SMA
    $6,450.00
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  • 4kW solar kit Trina 400 XL, Enphase Micro-inverter
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    4kW solar kit Trina 400 XL, Enphase Micro-inverter

    Trina

    $6,450.00
    This high-power, low cost solar energy system generates 4 kW of grid-tied electricity with (10) Trina 400 watt XL monocrystalline modules with silver frame, module optimizers, SolarEdge HD-wave inverter, 24/7 panel monitoring, disconnect box, safety...
    TSM400-4kW-Enphase
    $6,450.00
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  • Canadian 320 SMA Inverter Solar Kit
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    4.5kW solar kit Canadian 320, SMA inverter

    Canadian Solar

    $6,500.00
    This Canadian Solar power system generates 4.5kW (4480 watts) of grid-tied electricity with 14 Canadian 320 watt monocrystalline all-black modules, SMA Sunny Boy inverter with emergency power supply, Sunny Portal 24/7 monitoring, disconnect box, rooftop...
    CS320-4KW-SMA
    $6,500.00
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  • 4.6kW solar kit Silfab 330 black, SMA inverter
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    4.6kW solar kit Silfab 330 black, SMA inverter

    Silfab

    $6,500.00
    This high-quality 4.6 kW solar kit includes (14) Silfab 330 watt all-black model SIL-330 BL Mono-Perc 126-cell modules, SMA Sunny Boy inverter, safety disconnect, monitoring, rooftop mounting, system design, and safety labels. The made in North America...
    SIL330-4KW-SMA
    $6,500.00
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  • 4kW solar kit Axitec 400 XL, Enphase Micro-inverter AC-400MH/144S
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    4kW solar kit Axitec 400 XL, Enphase Micro-inverter

    Axitec Solar

    $6,650.00
    This 4 kW solar kit includes (10) Axitec 400 XL model AC-400MH/144S Mono-Perc 144-cell modules, Enphase micro-inverters, safety disconnect, monitoring, rooftop mounting, and safety labels. The German engineered Axitec solar panels have 25 year...
    AXI400-4kW-Enphase
    $6,650.00
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  • 4kW solar kit CSUN 390 XL, Enphase micros (CSUN390-4kW-Enphase)
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    4kW solar kit CSUN 390 XL, Enphase micros

    CSUN Solar

    $6,900.00
    This low cost 4 kW solar system generates 3900 watts of grid-tied DC power. The solar kit includes 10 CSUN 390 XL model CSUN390-72MH made in the USA solar panels, Enphase micro-inverters, monitoring and rooftop mounting. This is a total system package to...
    CSUN390-4kW-Enphase
    $6,900.00
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  • Q.Cells 400 XL Solar Kit with Enphase Micro-inverter
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    4kW solar kit Q.Cells 400 XL, Enphase Micro-inverter

    Q CELLS

    $7,150.00
    This high-efficiency Q Cells solar power system generates 4kW (4000 watts) of grid-tied electricity with 10 Q Cells 400 watt XL monocrystalline modules with silver frames, Enphase micro-inverters, 24/7 panel monitoring, safety disconnect, rooftop...
    QC400-4kW-Enphase
    $7,150.00
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  • 4.2kW solar kit Silfab 380 XL, Enphase Micro-inverter
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    4.2kW solar kit Silfab 380 XL, Enphase Micro-inverter

    Silfab

    $7,150.00
    This high-quality 4.2 kW solar kit includes (11) Silfab 380 watt XL model SIL-380 NT Mono-Perc 72-cell panels, Enphase micro-inverters, 24/7 panel monitoring, disconnect box, safety labels, rooftop mounting, permit-ready building electrical plans, and...
    SIL380-4kW-Enphase
    $7,150.00
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  • Tesla 330 Solar Kit SMA Inverter
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    4.6kW Solar Kit Tesla 330, SMA Inverter

    Tesla

    $7,300.00
    This is one the highest producing solar kits available with 19.7% ultra efficient Tesla solar panels that produce Sun power price performance at the lowest cost. This grid-tied PV energy system produces 4,620 watts (4.6 kW) with 14 Tesla SC330 modules,...
    SC330-4KW-SMA
    $7,300.00
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  • Trina 310 SolarEdge Inverter Solar Kit
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    4.3kW solar kit Trina 310, SolarEdge HD inverter

    Trina Solar

    $8,100.00
    This high-efficiency Trina Solar power system generates 4.3kW (4340 watts) of grid-tied electricity with 14 Trina 310 watt monocrystalline all-black modules, module optimizers, SolarEdge HD-wave inverter, 24/7 panel monitoring, disconnect box, rooftop...
    TSM310-4kW-SolarEdge
    $8,100.00
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  • Axitec 320 Solar Kit with SolarEdge HD Optimizers
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    4.4kW solar kit Axitec 320, SolarEdge HD optimizers

    Axitec Solar

    $8,150.00
    This Axitec Solar power system generates 4.4kW (4480 watts) of grid-tied electricity with 14 Axitec 320 watt monocrystalline modules, optimizers, SolarEdge HD-wave inverter, 24/7 panel monitoring, disconnect box, rooftop mounting, permit-ready building...
    AXI320-4kW-SolarEdge
    $8,150.00
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  • Trina 310 Kit Enphase Micro-inverter
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    4.3kW solar kit Trina 310, Enphase Micro-inverter

    Trina Solar

    $8,250.00
    This high-efficiency Trina Solar power system generates 4.3kW (4340 watts) of grid-tied electricity with 14 Trina 310 watt monocrystalline all-black modules, Enphase micro-inverters, 24/7 panel monitoring, disconnect box, rooftop mounting, permit-ready...
    TSM310-4kW-Enphase
    $8,250.00
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  • Axitec 320 Solar Kit with Enphase Micro-inverter
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    4.4kW solar kit Axitec 320, Enphase Micro-inverter

    Axitec Solar

    $8,300.00
    This Axitec Solar power system generates 4.4kW (4480 watts) of grid-tied electricity with 14 Axitec 320 watt monocrystalline modules, Enphase micro-inverters, 24/7 panel monitoring, safety disconnect, rooftop mounting, permit-ready building electrical...
    AXI320-4kW-Enphase
    $8,300.00
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Compare price and performance of the Top Brands to find the best 4 kW solar system with up to 30 year warranty. Buy the lowest cost 4 kW solar kit priced from $1.15 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 below to review parts list and options for battery storage, EV charging and installation.

What You Get With a 4kW Solar Kit

  • Up to 15 solar panels generate 500 kWh / mo (varies)
  • UL Certified with up to 30 year manufacturer warranty
  • Grid-tied inverters, optimizers or micro-inverters
  • Mount on rooftop or ground (optional); up to 300 sf
  • Flat-rate shipping with lift-gate service to continental U.S.
  • Installation instructions
  • 24/7 performance monitoring via web and smartphone
  • Lifetime technical support
  • Qualifies for all tax credits, rebates and incentives
  • Add-on options for battery storage, ground mounting, EV charging, permit plan or full-service installation

Featuring daily updates with the lowest prices on solar panels, SunWatts has a big selection of affordable 4 kW PV systems for sale. These 4kW size grid-connected solar kits include solar panels, DC-to-AC inverter, rack mounting system, hardware, cabling, permit plans and instructions. 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 320 square feet of space. 4kW or 4 kilowatts is 4,000 watts of DC direct current power. This could produce an estimated 500 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 highest output will be achieved with an unobstructed south-facing view of the sun for maximum solar power. 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.