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String Inverters

Limited stock
SolarEdge Inverter 3kW SE3000H-US000BNU4SolarEdge Inverter 3kW SE3000H-US000BNU4

SolarEdge Inverter 3kW SE3000H-US000BNU4

  • Size3 kW
  • TypeString
  • ConnectionGrid Tie
  • PhasesSingle-Phase

Delivery on May 06–11

Limited stock
SolarEdge Inverter 3.8kW SE3800H-USMNBBL14SolarEdge Inverter 3.8kW SE3800H-USMNBBL14

SolarEdge Inverter 3.8kW SE3800H-USMNBBL14

  • Size3.8 kW
  • TypeString
  • ConnectionGrid Tie
  • PhasesSingle-Phase

Delivery on May 06–11

Limited stock
SolarEdge Single Phase Inverter 3.8kW SE3800H-US000BEU4SolarEdge Single Phase Inverter 3.8kW SE3800H-US000BEU4

SolarEdge Single Phase Inverter 3.8kW SE3800H-US000BEU4

  • Size3.8 kW
  • TypeString
  • ConnectionGrid Tie
  • PhasesSingle-Phase

Delivery on May 06–11

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

SRNE HF2430U80-H 3kW Single Phase Hybrid Inverter/Charger

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

Delivery on May 04–07

Limited stock
SolarEdge 5 kW Inverter SE5000H-US000BEU4SolarEdge 5 kW Inverter SE5000H-US000BEU4

SolarEdge 5 kW Inverter SE5000H-US000BEU4

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

Delivery on May 06–11

Limited stock
SolarEdge SE6000H US000BNU4 6kW InverterSolarEdge SE6000H US000BNU4 6kW Inverter

SolarEdge SE6000H US000BNU4 6kW Inverter

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

Delivery on May 06–11

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

Delivery on May 06–11

Limited stock
Customer Choice
SolarEdge SE11400H-US000BEU4 11.4 kW Single Phase InverterSolarEdge SE11400H-US000BEU4 11.4 kW Single Phase Inverter

SolarEdge SE11400H-US000BEU4 11.4 kW Single Phase Inverter

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

Delivery on May 06–11

Limited stock
SolarEdge String Inverter 6kW SE6000H-US000BEU4SolarEdge String Inverter 6kW SE6000H-US000BEU4

SolarEdge String Inverter 6kW SE6000H-US000BEU4

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

Delivery on May 06–11

Limited stock
SolarEdge 3.8kW Single Phase Inverter SE3800H-USMNUBL75SolarEdge 3.8kW Single Phase Inverter SE3800H-USMNUBL75

SolarEdge 3.8kW Single Phase Inverter SE3800H-USMNUBL75

  • Size3.8 kW
  • TypeString
  • ConnectionGrid Tie
  • PhasesSingle-Phase

Delivery on May 06–11

Limited stock
SolarEdge Hybrid Inverter 7.6kW SE7600H-USMNUBL75SolarEdge Hybrid Inverter 7.6kW SE7600H-USMNUBL75

SolarEdge Hybrid Inverter 7.6kW SE7600H-USMNUBL75

  • Size7.6 kW
  • TypeString
  • ConnectionHybrid, Off-Grid, Grid Tie
  • PhasesSingle-Phase

Delivery on May 06–11

Limited stock
SolarEdge Hybrid Inverter 5.7kW SE5700H-USMNUBL75SolarEdge Hybrid Inverter 5.7kW SE5700H-USMNUBL75

SolarEdge Hybrid Inverter 5.7kW SE5700H-USMNUBL75

  • Size5.7 kW
  • TypeString
  • ConnectionHybrid, Off-Grid, Grid Tie
  • PhasesSingle-Phase

Delivery on May 06–11

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

Delivery on May 04–07

Limited stock
SolarEdge SE7600H USSNBBL14 7.6kW Home Hub String InverterSolarEdge SE7600H USSNBBL14 7.6kW Home Hub String Inverter

SolarEdge SE7600H USSNBBL14 7.6kW Home Hub String Inverter

  • Size7.6 kW
  • TypeString
  • ConnectionGrid Tie
  • PhasesSingle-Phase

Delivery on May 06–11

Limited stock
SolarEdge 10 kW Grid-tie Inverter SE10000H-USSolarEdge 10 kW Grid-tie Inverter SE10000H-US

SolarEdge 10 kW Grid-tie Inverter SE10000H-US

  • Size10 kW
  • TypeString
  • ConnectionGrid Tie
  • PhasesSingle-Phase

Delivery on May 06–11

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

Delivery on May 04–07

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

Delivery on May 04–07

Limited stock
Customer Choice
EG4 EG4-6000XP 6kW Single Phase Hybrid Inverter/ChargerEG4 EG4-6000XP 6kW Single Phase Hybrid Inverter/Charger

EG4 EG4-6000XP 6kW Single Phase Hybrid Inverter/Charger

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

Delivery on May 04–07

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

Delivery on May 04–07

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

Delivery on May 04–07

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

Delivery on May 04–07

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

Delivery on May 04–07

Limited stock
SolarEdge SE6000H US000BNU4 6kW String Inverter + 15 SolarEdge Optimizers S440 BundleSolarEdge SE6000H US000BNU4 6kW String Inverter + 15 SolarEdge Optimizers S440 Bundle

SolarEdge SE6000H US000BNU4 6kW String Inverter + 15 SolarEdge Optimizers S440 Bundle

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

Delivery on May 04–07

Limited stock
SolarEdge SE10000H US000BEU4 10kW Home Wave String Inverter + 15 SolarEdge Optimizers S440 BundleSolarEdge SE10000H US000BEU4 10kW Home Wave String Inverter + 15 SolarEdge Optimizers S440 Bundle

SolarEdge SE10000H US000BEU4 10kW Home Wave String Inverter + 15 SolarEdge Optimizers S440 Bundle

  • Size10 kW
  • TypeString
  • ConnectionGrid Tie
  • PhasesSingle-Phase

Delivery on May 04–07

Limited stock
SolarEdge SE5000H US000BEU4 5kW Home Wave String Inverter + 15 SolarEdge Optimizers S440 BundleSolarEdge SE5000H US000BEU4 5kW Home Wave String Inverter + 15 SolarEdge Optimizers S440 Bundle

SolarEdge SE5000H US000BEU4 5kW Home Wave String Inverter + 15 SolarEdge Optimizers S440 Bundle

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

Delivery on May 04–07

Limited stock
SolarEdge SE5000H US000BNU4 5kW String Inverter + 15 SolarEdge Optimizers S440 BundleSolarEdge SE5000H US000BNU4 5kW String Inverter + 15 SolarEdge Optimizers S440 Bundle

SolarEdge SE5000H US000BNU4 5kW String Inverter + 15 SolarEdge Optimizers S440 Bundle

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

Delivery on May 04–07

Limited stock
SolarEdge SE7600H US000BNU4 7.6kW String Inverter + 15 SolarEdge Optimizers S440 BundleSolarEdge SE7600H US000BNU4 7.6kW String Inverter + 15 SolarEdge Optimizers S440 Bundle

SolarEdge SE7600H US000BNU4 7.6kW String Inverter + 15 SolarEdge Optimizers S440 Bundle

  • Size7.6 kW
  • TypeString
  • ConnectionGrid Tie
  • PhasesSingle-Phase

Delivery on May 04–07

Limited stock
SolarEdge SE6000H US000BEU4 6kW Home Wave String Inverter + 15 SolarEdge Optimizers S440 BundleSolarEdge SE6000H US000BEU4 6kW Home Wave String Inverter + 15 SolarEdge Optimizers S440 Bundle

SolarEdge SE6000H US000BEU4 6kW Home Wave String Inverter + 15 SolarEdge Optimizers S440 Bundle

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

Delivery on May 04–07

Limited stock
SolarEdge SE7600H US000BEU4 7.6kW Home Wave String Inverter + 15 SolarEdge Optimizers S440 BundleSolarEdge SE7600H US000BEU4 7.6kW Home Wave String Inverter + 15 SolarEdge Optimizers S440 Bundle

SolarEdge SE7600H US000BEU4 7.6kW Home Wave String Inverter + 15 SolarEdge Optimizers S440 Bundle

  • Size7.6 kW
  • TypeString
  • ConnectionGrid Tie
  • PhasesSingle-Phase

Delivery on May 04–07

Limited stock
SolarEdge SE11400H US000BEU4 11.4kW Home Wave String Inverter + 15 SolarEdge Optimizers S440 BundleSolarEdge SE11400H US000BEU4 11.4kW Home Wave String Inverter + 15 SolarEdge Optimizers S440 Bundle

SolarEdge SE11400H US000BEU4 11.4kW Home Wave String Inverter + 15 SolarEdge Optimizers S440 Bundle

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

Delivery on May 04–07

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

EG4 EG4FLEXBOSS18 13kW Hybrid Inverter/Charger

  • Size13 kW
  • TypeString
  • ConnectionGrid Tie, Hybrid, Off-Grid
  • PhasesSingle-Phase

Delivery on May 04–07

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

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

  • Size9.6 kW
  • TypeString
  • ConnectionGrid Tie, Hybrid, Off-Grid
  • PhasesSingle-Phase

Free delivery on May 04–07

Limited stock
Fronius Primo GEN24 10kW Inverter FRO-P24-10.0-208-240Fronius Primo GEN24 10kW Inverter FRO-P24-10.0-208-240

Fronius Primo GEN24 10kW Inverter FRO-P24-10.0-208-240

  • Size10 kW
  • TypeString
  • ConnectionGrid Tie
  • PhasesSingle-Phase

Free delivery on May 04–07

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
  • PhasesThree-Phase, Single-Phase

Free delivery on May 04–07

Limited stock
SolarEdge SE7600H USSMBBL14 7.6kW Energy Hub String Inverter + 20 SolarEdge Optimizers S440 BundleSolarEdge SE7600H USSMBBL14 7.6kW Energy Hub String Inverter + 20 SolarEdge Optimizers S440 Bundle

SolarEdge SE7600H USSMBBL14 7.6kW Energy Hub String Inverter + 20 SolarEdge Optimizers S440 Bundle

  • Size7.6 kW
  • TypeString
  • ConnectionGrid Tie
  • PhasesSingle-Phase

Delivery on May 04–07

Limited stock
SolarEdge SE6000H USSMBBL14 6kW Energy Hub String Inverter + 20 SolarEdge Optimizers S440 BundleSolarEdge SE6000H USSMBBL14 6kW Energy Hub String Inverter + 20 SolarEdge Optimizers S440 Bundle

SolarEdge SE6000H USSMBBL14 6kW Energy Hub String Inverter + 20 SolarEdge Optimizers S440 Bundle

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

Delivery on May 04–07

Limited stock
SolarEdge SE7600H USSNBBL14 7.6kW Home Hub String Inverter + 20 SolarEdge Optimizers S440 BundleSolarEdge SE7600H USSNBBL14 7.6kW Home Hub String Inverter + 20 SolarEdge Optimizers S440 Bundle

SolarEdge SE7600H USSNBBL14 7.6kW Home Hub String Inverter + 20 SolarEdge Optimizers S440 Bundle

  • Size7.6 kW
  • TypeString
  • ConnectionGrid Tie
  • PhasesSingle-Phase

Delivery on May 04–07

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
  • PhasesThree-Phase, Single-Phase

Delivery on May 04–07

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 May 04–07

Limited stock
Customer Choice
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 May 04–07

Limited stock
EG4 EG418KPV12LV 12kW Hybrid Inverter/ChargerEG4 EG418KPV12LV 12kW Hybrid Inverter/Charger

EG4 EG418KPV12LV 12kW Hybrid Inverter/Charger

  • TypeString
  • ConnectionGrid Tie, Hybrid, Off-Grid
  • PhasesThree-Phase, Single-Phase

Free delivery on May 04–07

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 May 04–07

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 May 04–07

  • 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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