2:1
Modules per Power Optimizer, each with its own MPPT
1
SKU for simple ordering and superior wire management
50%
Fewer Power Optimizers to install
One Power Optimizer, two modules. Two MPPTs, one maximized yield.
SolarEdge Duo is our new commercial Power Optimizer. It introduces a single MPPT for each PV module in a 2:1 configuration, so you get the energy benefit of module-level optimization with half as many optimizers to order, wire and install. Compatible with commonly available PV modules.
This product replaces Power Optimizer C651U.
Key advantages
01
50% fewer optimizers*
Half as many optimizers to order, wire and install. Module-level energy harvest and monitoring. One optimizer, two independent MPPTs.
02
Simple installs
Short leads for the nearest module, pre-installed extensions for the next. Less wire slack = lower install costs. One SKU for commonly available PV modules.
03
Safer by design
Catch arcs early: Optimizer-level arc fault detection, a global industry first.
Prevent connector incidents: Sense Connect monitors the output and every input connection.
04
U.S. Manufactured
Domestic Content and FEOC levels match those of previous U.S.-manufactured Power Optimizers.**
Manufactured in our Florida facility.
Duo at a Glance
Key Specifications
01
1300 W
Output per optimizer (20 A)
02
No limit
On module rated power
03
62.5 V
Max Voc per connected module
04
24 A
Max Isc per connected module
Stop Arcs Before They Escalate: Arc Fault Detection on Every Power Optimizer
The SolarEdge Duo now acts as an arc sensor, part of our system-level arc fault circuit interruption (AFCI), for a safer roof.
- Protect longer strings: Coverage extends up to 3,280 feet of total cable length between the inverter and optimizer, minimizing blind spots in the array where string inverters cannot detect an arc.
- Stop arcs earlier: Detecting close to the arc signal improves accuracy and sensitivity, so an arc can be stopped before it escalates.
- Built-in backup: Every Power Optimizer detects arcs close to the source, in addition to detection at the inverter level.
- Fix issues faster: Pinpoint the problem down to the optimizer area for quick, cost-effective resolution.
SolarEdge Sense Connect for protection at every level
Patented technology designed to automatically detect and prevent potential electric arcs and thermal incidents at the connector level.
- Monitors the output connection and all input connections, which is unique to SolarEdge Duo.
- When an extension kit is connected to the inputs, Sense Connect continues to monitor the temperature of the connection closest to the optimizer.
Sense Connect monitors the temperature of the connector on each short cable.
Improved wire management
Long and short inputs for less slack and maximum flexibility.
South-facing racking wiring
Sharing one optimizer for two directions
01 / 03
Per-module MPPT keeps each module producing at its best, even with different tilt, orientation or shading.
2:1 configuration: One optimizer for two modules, for fewer parts and faster installation.
SolarEdge Duo allows for E-W module pairs connection.
One E-W wiring method for all rows: Fewer errors, and one fewer optimizer on odd-module strings.
2:1 configuration throughout the array.
How SolarEdge Duo works
1
One optimizer, two modules
Each module connects to its own input. Input 1 carries the yellow bands, so it is easy to tell from input 2.
2
Each MPPT tracks its module
Each MPPT continuously tracks its module’s power curve, independent of the other module in the pair.
3
Maximum power, all the time
Duo is designed to continuously adjust each module’s electrical operating point, so it always produces its maximum possible power.
Resources
Frequently asked questions
What is SolarEdge Duo?
SolarEdge Duo is our new commercial power optimizer. It introduces a single MPPT for each PV module in a 2:1 configuration, with 99.5% peak efficiency, and supports all commonly available modules.
Why is SolarEdge going back to a 2:1 Power Optimizer configuration?
A 2:1 configuration can cut install time by 50% which gives customers significant BOS savings. Now with having a MPPT for each module, production is also maximized.
How does one Power Optimizer give each module its own MPPT?
There are two independent MPPTs inside the optimizer. Each MPPT continuously tracks its module’s power curve and adjusts the module’s operating point so it produces its maximum possible power.
Is this manufactured in the U.S.?
Yes, this is manufactured in our Florida facility and will be replacing the C651U power optimizer. However, this is not backwards compatible with C651U or other older SolarEdge optimizers.
Which PV modules does SolarEdge Duo support?
SolarEdge Duo is designed for broad PV compatibility with commonly available module types and power classes, with no predefined wattage limit. The maximum Voc is 62.5V and the maximum Isc is 24A for each module connected, and the maximum continuous current per input is 20A.
Does Duo work for east-west designs?
Yes. Modules with different orientations can be connected to the same Power Optimizer, and east-west pairs are simpler and faster to connect than south-south pairs. Duo is designed to support even and odd numbers of modules per string with the same wiring method, and you can use leapfrog wiring to reduce DC balance of system cost.
How do I tell which connectors go to which modules?
Yellow bands mark input 1 so it is easy to tell from input 2. Inputs use MC4 connectors and outputs use MC4-EVO2 connectors, so mismatched connections are less likely. Pre-assembled extensions are made at the factory by SolarEdge. Download the installation guide for a diagram.
What is Sense Connect?
Sense Connect is patented technology that automatically detects and prevents potential electric arcs and thermal incidents at the connector level. On Duo it monitors the output connectors and all short inputs. With an extension kit connected, it keeps monitoring the temperature of the connector closest to the optimizer.
Which part numbers do I need?
One power optimizer part number, DUO-2GMHVBRU, covers all module power levels. The optional extension kit is OPT-EXT-MC4-1.6M, supplied as a pack of 100 extension wires.
Is Duo compatible with racking products?
We have worked with the major racking suppliers (Unirac, PanelClaw, IronRidge, Opsun) on any product changes. Final details are being completed on their end and will be announced shortly.
Do the extensions increase field issues?
All connectors and extensions are factory-made and tested, which eliminates the issues of field-made connectors. Duo short inputs are also monitored by Sense Connect, which flags any thermal issue should one occur.
Are there any changes to Domestic Content and FEOC compliance?
No - Eligible Domestic Content inverters when paired with SolarEdge Duo are expected to provide the same level of domestic content and FEOC compliance as C651U Power Optimizer per IRS notice 2025-08 and 2026-15, please see the Duo optimizer datasheet for more details.**
Can I add SolarEdge Duo Power Optimizer to strings with other Power Optimizers?
SolarEdge Duo Power Optimizer cannot be mixed with any other optimizer in the same string.
Is SolarEdge Duo Power Optimizer compatible with other power optimizers?
SolarEdge Duo Power Optimizer and other optimizers can be used within the same inverter (Synergy unit/threephase inverter) as long as they are not in the same string.
What inverters are the SolarEdge Duo Power Optimizer designed to support?
It can only be used with the following inverters (post-domestic content release): xSE-SIN-xxxxIxxxx, SE-DBLxxxxIxxxx and SE-TRI-xxxxIxxxx.
What happens if I need a C651U RMA?
SolarEdge will continue to support C651U RMAs (like previous optimizers) with same type of optimizers or equivalent ones.
Is Duo already in Designer?
Yes!
What do I need to do to change my design from C651U to Duo in Designer?
For 208Vac applications, first change the inverter model to a “for SolarEdge Duo” option, for 480Vac applications, inverter model will stay as is. Then simply use the optimizer drop down list to select “Duo” where C651U was previously set as the optimizer model.
*Compared to C651U Power Optimizers.
**Statements regarding tax credit eligibility, including domestic content and FEOC compliance, are based on current interpretations of applicable laws and guidance. These are subject to change. SolarEdge does not provide tax or legal advice. Please consult your own tax and legal advisors for project-specific guidance.