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String Inverters

In stock
Enphase IQ8PLUS Microinverter EN-IQ8PLUS-72-M-USEnphase IQ8PLUS Microinverter EN-IQ8PLUS-72-M-US

Enphase IQ8PLUS Microinverter EN-IQ8PLUS-72-M-US

  • TypeMicro
  • ConnectionGrid Tie
  • PhasesSingle-Phase

Pickup on Fri, Apr 10 from Pompano Beach, FL

Delivery on Apr 09–14

In stock
Enphase IQ8MC Microinverter EN-IQ8MC-72-M-USEnphase IQ8MC Microinverter EN-IQ8MC-72-M-US

Enphase IQ8MC Microinverter EN-IQ8MC-72-M-US

  • TypeMicro
  • ConnectionGrid Tie
  • PhasesSingle-Phase

Pickup on Fri, Apr 10 from Pompano Beach, FL

Delivery on Apr 09–14

In stock
Customer Choice
Enphase IQ8AC Microinverter IQ8AC-72-M-USEnphase IQ8AC Microinverter IQ8AC-72-M-US

Enphase IQ8AC Microinverter IQ8AC-72-M-US

  • TypeMicro
  • ConnectionGrid Tie
  • PhasesSingle-Phase

Pickup on Fri, Apr 10 from Pompano Beach, FL

Delivery on Apr 09–14

Limited stock
Customer Choice
Enphase IQ8HC Microinverter IQ8HC-72-M-USEnphase IQ8HC Microinverter IQ8HC-72-M-US

Enphase IQ8HC Microinverter IQ8HC-72-M-US

  • TypeMicro
  • ConnectionGrid Tie, Hybrid, Off-Grid
  • PhasesSingle-Phase

Pickup on Fri, Apr 10 from Pompano Beach, FL

Delivery on Apr 09–14

In stock
Enphase IQ9 Commercial Microinverter 427VA Domestic Content 277V Three-Phase EN-IQ9N-3P-277-A-DOM-USEnphase IQ9 Commercial Microinverter 427VA Domestic Content 277V Three-Phase EN-IQ9N-3P-277-A-DOM-US

Enphase IQ9 Commercial Microinverter 427VA Domestic Content 277V Three-Phase EN-IQ9N-3P-277-A-DOM-US

  • TypeMicro
  • ConnectionGrid Tie
  • PhasesThree-Phase

Delivery on Apr 09–14

In stock
Enphase IQ8HC Microinverter 384W Domestic Content 240/208V Grid-Forming Inverter EN-IQ8HC-72-M-DOM-USEnphase IQ8HC Microinverter 384W Domestic Content 240/208V Grid-Forming Inverter EN-IQ8HC-72-M-DOM-US

Enphase IQ8HC Microinverter 384W Domestic Content 240/208V Grid-Forming Inverter EN-IQ8HC-72-M-DOM-US

  • TypeMicro
  • ConnectionGrid Tie
  • PhasesSingle-Phase

Pickup on Fri, Apr 10 from Pompano Beach, FL

Delivery on Apr 09–14

Limited stock
SRNE HF2430U80-H 3kW Hybrid Inverter/ChargerSRNE HF2430U80-H 3kW Hybrid Inverter/Charger

SRNE HF2430U80-H 3kW Hybrid Inverter/Charger

  • Size3 kW
  • TypeString
  • ConnectionHybrid, Off-Grid, Grid Tie
  • PhasesSingle-Phase

Free delivery on Apr 09–14

Limited stock
SRNE HF4850U80-H 5kW Hybrid Inverter/ChargerSRNE HF4850U80-H 5kW Hybrid Inverter/Charger

SRNE HF4850U80-H 5kW Hybrid Inverter/Charger

  • Size5 kW
  • TypeString
  • ConnectionHybrid, Off-Grid, Grid Tie
  • PhasesSingle-Phase

Free delivery on Apr 09–14

Limited stock
SolarEdge 11.4 kW Inverter SE11400H-US000BEU4SolarEdge 11.4 kW Inverter SE11400H-US000BEU4

SolarEdge 11.4 kW Inverter SE11400H-US000BEU4

  • Size11.4 kW
  • TypeString
  • ConnectionGrid Tie
  • PhasesSingle-Phase

Delivery on Apr 13–16

Limited stock
Customer Choice
SolarEdge SE6000H-US000BEU4 Single Phase Inverter 6kW HD-Wave with SetApp ConfigurationSolarEdge SE6000H-US000BEU4 Single Phase Inverter 6kW HD-Wave with SetApp Configuration

SolarEdge SE6000H-US000BEU4 Single Phase Inverter 6kW HD-Wave with SetApp Configuration

  • Size6 kW
  • TypeString
  • ConnectionGrid Tie
  • PhasesSingle-Phase

Delivery on Apr 13–16

Limited stock
Victron Energy Inverter/Charger 3kW MultiPlus-II 48/3000/35-50 PMP482305102Victron Energy Inverter/Charger 3kW MultiPlus-II 48/3000/35-50 PMP482305102

Victron Energy Inverter/Charger 3kW MultiPlus-II 48/3000/35-50 PMP482305102

  • Size3 kW
  • TypePure Sine
  • ConnectionHybrid, Off-Grid, Grid Tie
  • PhasesSingle-Phase

Delivery on Apr 09–14

Limited stock
SolarEdge 6kW Inverter SE6000H-USSNBBL14SolarEdge 6kW Inverter SE6000H-USSNBBL14

SolarEdge 6kW Inverter SE6000H-USSNBBL14

  • Size6 kW
  • TypeString
  • ConnectionGrid Tie, Hybrid, Off-Grid
  • PhasesSingle-Phase

Free delivery on Apr 13–16

Limited stock
SRNE ABP4865U140-H 6.5kW Hybrid Inverter/ChargerSRNE ABP4865U140-H 6.5kW Hybrid Inverter/Charger

SRNE ABP4865U140-H 6.5kW Hybrid Inverter/Charger

  • Size6.5 kW
  • TypeString
  • ConnectionHybrid, Off-Grid, Grid Tie
  • PhasesSingle-Phase

Free delivery on Apr 09–14

Limited stock
MidNite Solar MNLR4548RE 4.5kW Pure Sine Inverter with ChargerMidNite Solar MNLR4548RE 4.5kW Pure Sine Inverter with Charger

MidNite Solar MNLR4548RE 4.5kW Pure Sine Inverter with Charger

  • Size4.5 kW
  • TypePure Sine
  • ConnectionOff-Grid
  • PhasesSingle-Phase

Free delivery on Apr 09–14

Limited stock
Phocos PSW-H-3KW-120/24V 3kW Hybrid Inverter/ChargerPhocos PSW-H-3KW-120/24V 3kW Hybrid Inverter/Charger

Phocos PSW-H-3KW-120/24V 3kW Hybrid Inverter/Charger

  • Size3 kW
  • TypeString
  • ConnectionHybrid, Off-Grid, Grid Tie
  • PhasesSingle-Phase

Free delivery on Apr 09–14

Limited stock
SRNE ABP48100U200-H 10kW Hybrid Inverter/ChargerSRNE ABP48100U200-H 10kW Hybrid Inverter/Charger

SRNE ABP48100U200-H 10kW Hybrid Inverter/Charger

  • Size10 kW
  • TypeString
  • ConnectionHybrid, Off-Grid, Grid Tie
  • PhasesSingle-Phase

Free delivery on Apr 09–14

Limited stock
EG4 EG4-6000XP 6kW Off-Grid Inverter/ChargerEG4 EG4-6000XP 6kW Off-Grid Inverter/Charger

EG4 EG4-6000XP 6kW Off-Grid Inverter/Charger

  • Size6 kW
  • TypeString
  • ConnectionHybrid, Off-Grid, Grid Tie
  • PhasesSingle-Phase

Free delivery on Apr 09–14

Limited stock
Phocos PSW-H-6.5KW-120/48V 6.5kW Hybrid Inverter/ChargerPhocos PSW-H-6.5KW-120/48V 6.5kW Hybrid Inverter/Charger

Phocos PSW-H-6.5KW-120/48V 6.5kW Hybrid Inverter/Charger

  • Size6.5 kW
  • TypeString
  • ConnectionHybrid, Off-Grid, Grid Tie
  • PhasesSingle-Phase

Free delivery on Apr 09–14

Limited stock
EG4 EG4-12000XP 12kW Off-Grid Inverter/ChargerEG4 EG4-12000XP 12kW Off-Grid Inverter/Charger

EG4 EG4-12000XP 12kW Off-Grid Inverter/Charger

  • Size12 kW
  • TypeString
  • ConnectionGrid Tie, Hybrid, Off-Grid
  • PhasesSingle-Phase, Three-Phase

Free delivery on Apr 09–14

Limited stock
Outback Power VFXR3648A-01 3.6 kW FXR Series Grid/Hybrid Inverter/ChargerOutback Power VFXR3648A-01 3.6 kW FXR Series Grid/Hybrid Inverter/Charger

Outback Power VFXR3648A-01 3.6 kW FXR Series Grid/Hybrid Inverter/Charger

  • Size3.6 kW
  • TypeString
  • ConnectionHybrid, Off-Grid, Grid Tie
  • PhasesSingle-Phase

Free delivery on Apr 09–14

Limited stock
Outback Power VFXR2812A 2.8 kW FXR Series Grid/Hybrid Inverter/ChargerOutback Power VFXR2812A 2.8 kW FXR Series Grid/Hybrid Inverter/Charger

Outback Power VFXR2812A 2.8 kW FXR Series Grid/Hybrid Inverter/Charger

  • Size2.8 kW
  • TypeString
  • ConnectionHybrid, Off-Grid, Grid Tie
  • PhasesSingle-Phase

Free delivery on Apr 09–14

Limited stock
Victron Energy Inverter/Charger 4kW Quattro 24/5000/120-100/100 120V QUA245023110Victron Energy Inverter/Charger 4kW Quattro 24/5000/120-100/100 120V QUA245023110

Victron Energy Inverter/Charger 4kW Quattro 24/5000/120-100/100 120V QUA245023110

  • Size4 kW
  • TypePure Sine
  • ConnectionOff-Grid, Grid Tie, Hybrid
  • PhasesSingle-Phase

Delivery on Apr 09–14

Limited stock
Sol-Ark SA-5K-1P 5kW String InverterSol-Ark SA-5K-1P 5kW String Inverter

Sol-Ark SA-5K-1P 5kW String Inverter

  • Size5 kW
  • TypeString
  • ConnectionGrid Tie
  • PhasesSingle-Phase

Free delivery on Apr 09–14

Limited stock
Magnum Energy Pure Sine Inverter 4kW MS4048-LMagnum Energy Pure Sine Inverter 4kW MS4048-L

Magnum Energy Pure Sine Inverter 4kW MS4048-L

  • Size4 kW
  • TypePure Sine
  • ConnectionGrid Tie, Hybrid, Off-Grid
  • PhasesSingle-Phase

Delivery on Apr 09–14

Limited stock
Magnum Energy Pure Sine Inverter 3kW MSH3012RV-LMagnum Energy Pure Sine Inverter 3kW MSH3012RV-L

Magnum Energy Pure Sine Inverter 3kW MSH3012RV-L

  • Size3 kW
  • TypePure Sine
  • ConnectionGrid Tie, Hybrid, Off-Grid
  • PhasesSingle-Phase

Delivery on Apr 09–14

Limited stock
Magnum Energy Inverter 4.4kW MS4448PAEMagnum Energy Inverter 4.4kW MS4448PAE

Magnum Energy Inverter 4.4kW MS4448PAE

  • Size4.4 kW
  • TypePure Sine
  • ConnectionGrid Tie, Hybrid, Off-Grid
  • PhasesSingle-Phase

Delivery on Apr 09–14

Limited stock
Victron Energy Inverter/Charger 8kW Quattro 48/10000/140-100/100 120V QUA483100102Victron Energy Inverter/Charger 8kW Quattro 48/10000/140-100/100 120V QUA483100102

Victron Energy Inverter/Charger 8kW Quattro 48/10000/140-100/100 120V QUA483100102

  • Size8 kW
  • TypePure Sine
  • ConnectionOff-Grid, Grid Tie, Hybrid
  • PhasesSingle-Phase

Delivery on Apr 09–14

Limited stock
Victron Energy Inverter/Charger 5kW Quattro 12/5000/220-100/100 120V QUA125021100Victron Energy Inverter/Charger 5kW Quattro 12/5000/220-100/100 120V QUA125021100

Victron Energy Inverter/Charger 5kW Quattro 12/5000/220-100/100 120V QUA125021100

  • Size5 kW
  • TypePure Sine
  • ConnectionGrid Tie, Hybrid, Off-Grid
  • PhasesSingle-Phase

Delivery on Apr 09–14

Limited stock
SMA Sunny Boy Smart Energy 5.8 kW Hybrid Inverter SMA-SBSE5.8-US-50SMA Sunny Boy Smart Energy 5.8 kW Hybrid Inverter SMA-SBSE5.8-US-50

SMA Sunny Boy Smart Energy 5.8 kW Hybrid Inverter SMA-SBSE5.8-US-50

  • Size5.8 kW
  • PhasesSingle-Phase

Delivery on Apr 09–14

Limited stock
OutBack Power SkyBox 5 kW Hybrid Inverter SBX5048-120/240 ClearanceOutBack Power SkyBox 5 kW Hybrid Inverter SBX5048-120/240 Clearance

OutBack Power SkyBox 5 kW Hybrid Inverter SBX5048-120/240 Clearance

  • Size5 kW
  • PhasesSingle-Phase
  • Cell TypeMonocrystalline

Pickup on Fri, Apr 10 from Coral Springs, FL

Delivery on Apr 09–14

Limited stock
SMA Sunny Boy Smart Energy 9.6 kW Hybrid Inverter SMA-SBSE9.6-US-50SMA Sunny Boy Smart Energy 9.6 kW Hybrid Inverter SMA-SBSE9.6-US-50

SMA Sunny Boy Smart Energy 9.6 kW Hybrid Inverter SMA-SBSE9.6-US-50

  • Size9.6 kW
  • PhasesSingle-Phase

Free delivery on Apr 09–14

Limited stock
MidNite Solar MNROSIE7048RE 7kW Pure Sine Inverter with ChargerMidNite Solar MNROSIE7048RE 7kW Pure Sine Inverter with Charger

MidNite Solar MNROSIE7048RE 7kW Pure Sine Inverter with Charger

  • Size7 kW
  • TypePure Sine
  • ConnectionOff-Grid
  • PhasesSingle-Phase

Free delivery on Apr 09–14

Limited stock
EG4 EG4FLEXBOSS18 13kW Hybrid Inverter/ChargerEG4 EG4FLEXBOSS18 13kW Hybrid Inverter/Charger

EG4 EG4FLEXBOSS18 13kW Hybrid Inverter/Charger

  • Size13 kW
  • TypeString
  • ConnectionHybrid, Off-Grid, Grid Tie
  • PhasesSingle-Phase

Free delivery on Apr 09–14

Limited stock
EG4 EG412KPV8LV 8kW Hybrid Inverter/ChargerEG4 EG412KPV8LV 8kW Hybrid Inverter/Charger

EG4 EG412KPV8LV 8kW Hybrid Inverter/Charger

  • Size8 kW
  • TypeString
  • ConnectionGrid Tie, Hybrid, Off-Grid
  • PhasesSingle-Phase, Three-Phase

Free delivery on Apr 09–14

Limited stock
SRNE HESP48180UH3 18kW Hybrid Inverter/ChargerSRNE HESP48180UH3 18kW Hybrid Inverter/Charger

SRNE HESP48180UH3 18kW Hybrid Inverter/Charger

  • Size18 kW
  • TypeString
  • ConnectionGrid Tie, Hybrid, Off-Grid
  • PhasesSingle-Phase, Three-Phase

Free delivery on Apr 09–14

Limited stock
Sol-Ark SA-12K-2P 12kW Hybrid InverterSol-Ark SA-12K-2P 12kW Hybrid Inverter

Sol-Ark SA-12K-2P 12kW Hybrid Inverter

  • Size12 kW
  • TypeString
  • ConnectionHybrid, Off-Grid, Grid Tie
  • PhasesSingle-Phase, Three-Phase

Free delivery on Apr 09–14

Limited stock
EG4 EG4FLEXBOSS21 16kW Hybrid Inverter/ChargerEG4 EG4FLEXBOSS21 16kW Hybrid Inverter/Charger

EG4 EG4FLEXBOSS21 16kW Hybrid Inverter/Charger

  • Size16 kW
  • TypeString
  • ConnectionGrid Tie, Hybrid, Off-Grid
  • PhasesSingle-Phase, Three-Phase

Free delivery on Apr 09–14

Limited stock
Midnite Power MN15-12KW-AIO 10kW Hybrid Inverter/ChargerMidnite Power MN15-12KW-AIO 10kW Hybrid Inverter/Charger

Midnite Power MN15-12KW-AIO 10kW Hybrid Inverter/Charger

  • Size10 kW
  • TypeString
  • ConnectionGrid Tie, Hybrid, Off-Grid
  • PhasesSingle-Phase, Three-Phase

Free delivery on Apr 09–14

Limited stock
Sol-Ark SA-15K-2P 15.0kW Hybrid InverterSol-Ark SA-15K-2P 15.0kW Hybrid Inverter

Sol-Ark SA-15K-2P 15.0kW Hybrid Inverter

  • Size15 kW
  • TypeString
  • ConnectionGrid Tie, Hybrid, Off-Grid
  • PhasesSingle-Phase

Free delivery on Apr 09–14

Limited stock
Sol-Ark SA-18K-2P 18kW Hybrid InverterSol-Ark SA-18K-2P 18kW Hybrid Inverter

Sol-Ark SA-18K-2P 18kW Hybrid Inverter

  • Size18 kW
  • TypeString
  • ConnectionGrid Tie, Hybrid, Off-Grid
  • PhasesSingle-Phase, Three-Phase

Free delivery on Apr 09–14

Limited stock
Sol-Ark SA-30K-3P 30kW Hybrid InverterSol-Ark SA-30K-3P 30kW Hybrid Inverter

Sol-Ark SA-30K-3P 30kW Hybrid Inverter

  • Size30 kW
  • TypeString
  • ConnectionGrid Tie, Hybrid, Off-Grid
  • PhasesSingle-Phase, Three-Phase

Free delivery on Apr 09–14

  • Overview
  • Articles

String Inverters for Solar

A string inverter converts DC power from series-connected solar panels into grid-synchronized AC through centralized conversion. Unlike microinverters, string inverters handle 3-50 kW through 1-4 independent MPPT channels, delivering 97.5-98.8% efficiency with significantly lower system costs typically $0.12-0.18/watt versus $0.28-0.34/watt for distributed alternatives in residential applications.

String Inverter Architecture: What Makes the Difference

Modern string inverters process multiple strings through independent MPPT channels, each functioning as a dedicated DC-DC converter. A dual-MPPT 10 kW unit simultaneously optimizes east and west-facing arrays experiencing different irradiance profiles, or compensates for partial shading on one roof plane while maintaining full output from another. This represents the core advantage: centralized efficiency with substring-level optimization when properly configured.

Transformerless vs Transformer-Based Topology

Feature Transformerless Transformer-Based
Peak Efficiency 98.5-98.8% 96-97%
Weight 35-50 lbs 140-180 lbs
Cost Lower Higher
Best For Crystalline modules, modern codes Thin-film, ungrounded arrays required
Annual Energy Gain 200-400 kWh (8kW system) Baseline

Transformerless designs dominate residential markets, eliminating the 60 Hz isolation transformer to improve efficiency and reduce weight. They require active ground fault monitoring but work seamlessly with crystalline silicon modules (95% of current installations).

When String Inverters Make Economic Sense

String inverters optimize value for installations with minimal shading, uniform orientation, and systems above 4 kW. The economics are compelling:

Residential 10 kW System

$1,200-1,800 (string) vs $2,800-3,400 (microinverters)

Commercial 30 kW System

$3,000-4,500 (string) vs $7,500-9,600 (distributed)

Labor Difference

2-3 hours (string) vs 8-12 hours (microinverters) for 30 kW

Under partial shading, inverters experience proportional losses due to series connection. However, if shade reduces annual production by less than 15%, lower string inverter cost typically outweighs production differences over 25 years. Strategic string design placing shaded panels on separate MPPT channels often proves more economical than distributed electronics.

String Sizing Methodology: Voltage and Current Limits

Voltage Window Calculations

String sizing ensures voltage remains within MPPT range across all temperatures while never exceeding maximum input voltage. Solar modules exhibit temperature-dependent behavior (typically -0.29% to -0.35%/°C).

Example: 400W modules (49.5V Vmp, 59.3V Voc, -0.29%/°C) in -15°C climate:

Cold temperature (-15°C): 66.2V Voc per module

10-module string: 662V Voc → Exceeds 600V limit (FAILS)

9-module string: 596V Voc → Within limits (PASSES)

Hot temperature (75°C): 387V Vmp → Within MPPT window

Sizing Process:

1. Determine record low temperature (ASHRAE 99.6% data by ZIP)

2. Add 3°C for morning solar gain = minimum cell temperature

3. Calculate cold Voc: must stay below maximum input voltage

4. Calculate hot Vmp: must stay above MPPT minimum (typically 200-250V)

5. Verify standard temperature Vmp falls within MPPT range (typically 480-800V)

Current Capacity and Paralleling

MPPT channels specify maximum input current (18-25A residential, 30-40A commercial). Using 400W modules (11.8A Imp, 12.7A Isc):

Single String

11.8A → OK for 25A channel

Two Parallel Strings

23.6A Imp, 25.4A Isc → Maximum for 25A channel

Three Parallel Strings

35.4A → Exceeds capacity

Critical rule: Parallel strings must have identical module counts and preferably same manufacturing batch to prevent current imbalance costing 2-5% production.

Optimal DC-to-AC Ratios

Modern sizing employs 1.15-1.30 DC-to-AC ratios, accepting brief clipping during peak conditions. Modules rarely achieve rated output in the field (realistic peak: 90-95% of nameplate), making aggressive ratios economically optimal.

Configuration Array Inverter Ratio String Layout Annual Clipping Economic Impact
Conservative 6.4 kW 6.0 kW 1.07 2×8 modules <1%, ~20 kWh Base cost
Optimized 7.6 kW 6.0 kW 1.27 10 9 modules 3-4%, ~250 kWh Saves $600-800 on inverter
Small Commercial 21.6 kW 18.0 kW 1.20 6×9 modules 2-3%, ~500 kWh Saves $1,200-1,800
Split East-West 8.0 kW 7.6 kW 1.05 2 MPPT: 10E 10W <1%, ~15 kWh Minimal clipping risk

Economic analysis: A 10 kW inverter handling 12 kW array (1.20 ratio) loses 100-300 kWh annually ($12-45 value) but saves $800-1,200 versus a 12 kW inverter—20 year payback on lost production.

Expert Tip

Size for actual field output using 0.90-0.92 factor. A 10 kW nameplate array produces ~9.0-9.2 kW peak field output, allowing a 7.5-8.0 kW inverter without significant clipping.

Leading Manufacturer Comparison

Brand CEC Efficiency MPPT Channels Warranty Key Strength Price Tier
SMA 97.5-98.0% 2 10 yr Service network depth, 40 yr history $$
Fronius 97.6-98.2% 2 10 yr Tool-free installation, integrated AFCI $$
SolarEdge 97.5-99.0% 1-2 12 yr Monitoring platform, optimizer integration $$$
Sol-Ark 97.5-98.5% 2 10 yr All-in-one solution, backup integration $$

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