RSP400DCT
Renogy 400W Bifacial wiring diagram
RSP400DCT 400 W bifacial N-type panel, Vmp 34 V, Voc 39.42 V and Isc 13.06 A. 1722 × 1134 × 35 mm, 20.6 kg; rear-side gain depends on the mounting and reflected light.
- Nominal voltage
- 34 V
- Rated power
- 400 W
- Rated output
- 11.8 A
Wiring diagram
How the 400W Bifacial is wired.
Open this example in Crimp to use your own parts and cable lengths. Review the assumptions and installation notes as you adapt the circuit.
Cable sizing for this example
Use the diagram as a starting point for your installation. Replace the example equipment and cable lengths with your own, and check the connections against your exact model's instructions.
3 m one way
34 V panel Vmp
- Wire
- 1.5 mm² · 16 AWG
- Example fuse
- 15 A
- Design current
- 11.8 A
- Voltage drop
- 2.5%
Sized against ABYC E-11. The design current is the part's continuous draw. The length is one way; voltage drop includes an equal-length return.
Run-length and manufacturer assumptions
The editable example uses 3.048 m (10 ft) runs unless a shorter run is stated. Metric overviews round these to 3 m. Adapt the parts and lengths to your installation before choosing cable and protection.
Supporting parts
- 6.1 m total of 1.5 mm² (16 AWG) marine cable
- Terminations for 1.5 mm² cable, matched to the equipment's screw terminals, leads or studs
- 15 A fuse and holder on the positive run
- Heat-shrink, strain relief and terminal boots sized to the cable
Check stud sizes, fuse type, run length and how warm the space gets against the gear you actually have before you order.
Installation notes
Before you install.
Open a question for model-specific guidance and sources.
Verified against the manufacturer's documentation (rev. Undated manufacturer datasheet; accessed 2026-10-01), checked 2026-10-01. Manufacturer documentation →
Identify the 400 W module within the two-pack sheet
The RSP400DCT column is sold as RSP400DCT-108x2 in Renogy's shared 320/400 W two-pack datasheet. Its ratings are per 400 W panel, not the combined package: 34.0 V Vmp, 11.76 A Imp, 39.42 V Voc and 13.06 A Isc. See technical table, page 2. The adjacent 320 W column describes a different module.
The 400 W panel has 108 half-cells, measures 1722 × 1134 × 35 mm and weighs 20.6 kg. Verify the actual label and revision before combining older stock.
Allow for cold voltage and rear-side current
The sheet specifies −0.26%/°C Voc temperature coefficient. Calculate the full series string's cold Voc, including applicable tolerances, before selecting a controller. Use an MPPT controller for a 12 V battery and respect its voltage, short-circuit-current and power limits.
Bifacial production depends on light reaching the rear surface, roof reflectivity, spacing and shadows. Extra output is not a fixed percentage to add to every system. Check expected rear-side current contribution when sizing the PV input and conductors. The catalog's 4.2 sun-hour default is a planning assumption, not a manufacturer performance guarantee.
Distinguish module, connector and fuse ratings
The exact table gives 25 A maximum series fuse, 1500 V maximum module-system voltage, and separate connector ratings of 40 A / 1500 V. These are different constraints. A high connector rating does not permit a module fuse above 25 A; a high module-system voltage does not permit exceeding the charge controller's input voltage.
The supplied output leads are 12 AWG, 1700 mm, and the junction box contains three bypass diodes. Match extensions to the actual locking connector type, secure cable loops and protect them from abrasion. Crimp's 15 A terminal envelope remains a conservative planning value, not published connector ampacity or a prescribed string fuse.
Mount to expose the rear without compromising support
Use the frame's designed mounting points and a structure suitable for this large glass panel. Keep rails and other objects from unnecessarily shading the rear active area. Preserve drainage, airflow and cable access. Renogy's rigid monofacial/bifacial mounting instructions, section 2.1.2, cover the family installation method.
Cover and isolate modules while assembling the circuit, never disconnect live PV connectors under load, and verify polarity before energizing. Follow the controller's battery-first commissioning sequence and set its charging profile for the actual battery chemistry. Inspect mounting fasteners and cable support after vehicle vibration or severe weather.
Technical reference
Specifications and terminal map.
Check the model, ratings and connection points against your own unit before choosing installation hardware.
Catalog specification
RSP400DCT 400 W bifacial N-type panel, Vmp 34 V, Voc 39.42 V and Isc 13.06 A. 1722 × 1134 × 35 mm, 20.6 kg; rear-side gain depends on the mounting and reflected light.
- Nominal voltage
- 34 V
- Rated power
- 400 W
- Rated output
- 11.8 A
- Panel open-circuit voltage
- 39.4 V
Terminal map
Catalog connection points, current direction and planning limits. Check the manufacturer's pinout and connector ratings before installation.
+
positive · bidi
−
negative · bidi
Sources and sizing method
Equipment specifications. Model details, ratings and terminal roles come from the catalog. Check your unit’s label and current manufacturer documentation for its exact revision.
Example sizing. Sized against ABYC E-11. Boats built to UK or EU rules answer to ISO 13297 — check these figures against it before you build. Results use the example current and run length shown above. Set your actual equipment, lengths and installation conditions in Crimp before choosing hardware.
Read how the sizing worksNext step
Plan your installation with 400W Bifacial.
Open this example as a new project, or add this component to your existing diagram. Use your equipment and cable lengths to review the sizing.
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