↓ Skip to pricing and availability for this item
A 125 kW three-phase string inverter can serve large commercial rooftops, carports and ground-mount blocks. Select the DC voltage platform, MPPT arrangement, current limits and grid-code variant from the actual module layout and connection requirements.
Rated power alone does not determine the MPPT count or maximum DC voltage. Compare the selected 100 kW and 125 kW model datasheets against the array design rather than assuming a 1,500 V platform.
Why the extra MPPT inputs matter
On a large roof the array is rarely one plane. Every change of orientation, tilt or shading pattern is a different maximum power point, and a single-input design forces them to a compromise.
- More orientations per unit. Multiple independent MPPTs can accommodate suitable string groups with different orientations. Confirm the actual MPPT count and connection rules for the selected model.
- Monitoring detail. Confirm whether measurements and alarms are per inverter, per MPPT or per string. More inputs alone do not guarantee string-level fault location.
- More design freedom on string length. Independent inputs allow different string lengths for different roof faces rather than one compromise length.
Where the roof is a single plane, the extra inputs buy less, and the 100 kW unit is usually the better value.
Specifications
Configuration reference
Swipe horizontally to view all columns →
| Parameter | Typical value | What it depends on |
|---|---|---|
| Rated AC power | 125 kW at 480 V three-phase | Array size and the DC-to-AC ratio you design to |
| MPPT inputs | Up to 12 | Number of orientations and independent string groups |
| MPPT voltage range | 200 to 1 000 V DC | String length at the coldest expected temperature |
| Maximum DC voltage | Confirm the DC voltage platform of the selected model | String design, equipment ratings and applicable installation requirements |
| Maximum current per MPPT | Up to 40 A | Module short-circuit current and string fuse |
| Maximum efficiency | Up to 99.0 percent | Load level and DC input voltage |
| Output | 480 V three-phase, 60 Hz | Plant voltage and utility standard |
| Enclosure | Confirm the selected IP and/or NEMA enclosure rating | Manufacturer model rating and installation instructions |
| Surge protection | Type II on DC and AC, with optional Type I | Lightning exposure of the site |
| Communications | RS485, Ethernet, Modbus or SunSpec, IEC 60870 where required | Monitoring and SCADA requirements |
| Compliance documents | Confirm applicable listing, grid-code compliance and safety documents | Exact model, firmware and utility interconnection requirements |
| Warranty | Confirm manufacturer warranty term and any extension options for the selected model | Selected model and written order terms |
Figures are selection references. Confirm the final ratings, dimensions, available certifications and warranty against the current datasheet and written proposal for the selected model or system.
What arrives in a typical order
- The inverter with the DC isolator and the AC connection arranged for your cable entry.
- Wall or pad mounting bracket and the drilling template.
- Commissioning tool access, firmware current at the time of shipping, and monitoring credentials.
- Installation manual, grid-code settings guide and warranty terms.
Where the project needs it, the modules, the mounting, the medium-voltage step-up transformer and the switchgear are quoted on the same order, so the string configuration, the transformer rating and the protection settings are settled together.
Where a 125 kW unit usually goes
- Large commercial and industrial roofs with several orientations or a complicated shade pattern.
- Ground-mount blocks using a 1 500 V DC architecture to reduce the cable and combiner count.
- Large carports where the array per unit is maximised to reduce the number of units and pads.
- Solar-plus-storage projects where the storage is AC-coupled and the inverter is sized to the array alone.
Sizing notes before you order
- Confirm the selected model maximum DC voltage, operating MPPT window and current limits before setting string length. Check the cold-temperature open-circuit voltage and the voltage ratings of every DC component.
- Check the current per MPPT against the module short-circuit current. Large-format modules carry more current, and this is the check that decides compatibility before anything else.
- Confirm the grid code and the ride-through behaviour your utility requires. At this rating the interconnection agreement usually specifies it.
- Plan the pad or the wall. At this size the unit is heavier and the cable bending radii are larger, which affects the conduit layout more than people expect.
Documentation to confirm for your order
- Datasheet and the installation manual with the wiring diagram.
- Grid-code certification for your market, with the ride-through and anti-islanding test report.
- Settings guide for the protection functions your utility requires.
- Packing list, delivery documentation and warranty registration.
Questions buyers ask
125 kW or two smaller units?
One larger unit is usually cheaper per watt and takes less wall space. Two smaller units give redundancy: a failure takes out half the array rather than all of it. Where the consequence of a total outage is high, the redundancy is worth the premium.
Does the 1 500 V platform change the cable design?
If the selected inverter uses a 1,500 V DC platform, check string voltage at the site temperature extremes and confirm that every DC component has the required voltage rating. Other 125 kW models may use a different platform, so the design follows the actual model datasheet.
Can it handle a roof with several orientations?
Yes, where the selected model has enough independent MPPTs for the planned string groups. Strings sharing one MPPT must meet the manufacturer compatibility and connection requirements; the rated AC power does not determine the MPPT count.
What grid-code functions does it have?
Anti-islanding, over and under voltage and frequency protection, DC injection monitoring, and the ride-through behaviour specified in IEEE 1547-2018 where your utility requires it. The settings guide comes with the unit and the report matches the standard.
How fast can it ship?
Stock availability depends on the exact grid-code variant and DC voltage platform. Confirm warehouse availability, dispatch timing and delivery destination with the quotation.
What to send us
Send the module model and quantity, the string layout, the utility connection requirements and target date. Confirm the selected inverter DC voltage platform, input-current limits and grid-code variant against the array before ordering.
EXPLORE FURTHER
Compare equipment & technical guides.
Start a B2B enquiry
Send the service voltage and the string layout
With the service voltage, string configuration and which circuits need backup, we confirm the right unit, the grid-support settings required in your utility area, and current availability.
Send your requirementsOr reach us directly: +86 136 7367 3267 · sales@gtpsolar.com