Charger
Renogy DCC50S wiring diagram
Legacy RBC50D1S-G1 dual-input charger with a shared 50 A output and 25 V maximum solar input. Simultaneous charging is limited to 25 A from each source. Verify the generation before using newer DCC50S instructions.
- Rated output
- 50 A
- PV open-circuit limit
- 25 V
Wiring diagram
How the DCC50S 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
12 V system
- Wire
- 16 mm² · 6 AWG
- Example fuse
- 70 A
- Design current
- 50 A
- Voltage drop
- 2.8%
Sized against ABYC E-11. The design current is the unit's rated output. 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 16 mm² (6 AWG) marine cable
- Terminations for 16 mm² cable, matched to the equipment's screw terminals, leads or studs
- 70 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. Version 1.1), checked 2026-10-01. Manufacturer documentation →
Which DCC50S does this cover?
This walkthrough uses Renogy's DCC50S Version 1.1 manual, for the older 25 V maximum solar-input unit. Newer RBC50D1S generations have different solar limits and manuals; verify the label before substituting their instructions. This version charges a 12 V service battery at up to 50 A total from a starter/alternator circuit and solar.
How do the terminals map?
The printed page 7 diagram shows four power terminals: PV+, ALT+, OUT+, and common NEG−. ALT+ is the starter-battery/alternator connection. Crimp's separate ALT + and START + labels do not represent two independent physical input studs. BATT + maps to OUT+; PV and battery negatives return through common NEG−.
The symbol omits RS485, battery-temperature sensing, battery-voltage sensing, IGN, and the battery-type button. Connect the negative first, then service-battery positive, starter-battery positive, and PV positive, following printed page 10. A smart alternator requires the supplied ignition signal connection; the conventional-alternator arrangement leaves IGN unused.
Which fuses and cables are specified?
The printed page 11 table specifies a 75 A vehicle-input fuse and 65 A charger-output fuse. It recommends 6 AWG for 1–5 m and 4 AWG for 5–9 m cable lengths. Preserve those manual-specific values when reviewing protection; do not replace them with the 50 A output rating. Fuse selection must also protect the actual conductor and suit the source's fault current.
The guide identifies M8 power terminals but does not supply a numerical tightening torque. Mount in a dry, splash-protected, ventilated position with at least 50 mm clearance around the charger.
How is charging shared?
With one source, this version can deliver up to 50 A charge current. With solar and alternator contributing together, printed page 13 limits each contribution to 25 A, with 50 A combined maximum. A small solar contribution therefore does not guarantee 50 A from the alternator as well.
Solar startup requires more than 15 V for 10 seconds. Design the array below the 25 V maximum Voc, including cold conditions; the overvoltage shutdown threshold is not extra design headroom.
What should be set before use?
Select the actual battery chemistry and verify its approved charge voltages. The Version 1.1 table lists 14.4 V boost with no float/equalization for LI, while lead-acid programs differ. Confirm temperature sensing and BMS charge permission separately. Check that charging stops as intended when the engine is off, and test solar/starter maintenance behavior before relying on it unattended.
Fit check
Connect it to the rest of your system.
Describe your setup to draft a system with DCC50S connected. Review the selected parts and cable lengths, then edit the diagram in Crimp.
The model only picks parts and draws the connections. Every wire size and fuse rating still comes from Crimp's own sizing, never from the model.
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Technical reference
Specifications and terminal map.
Check the model, ratings and connection points against your own unit before choosing installation hardware.
Catalog specification
Legacy RBC50D1S-G1 dual-input charger with a shared 50 A output and 25 V maximum solar input. Simultaneous charging is limited to 25 A from each source. Verify the generation before using newer DCC50S instructions.
- Rated output
- 50 A
- Planning charge current
- 45 A
- PV open-circuit limit
- 25 V
Terminal map
Catalog connection points, current direction and planning limits. Check the manufacturer's pinout and connector ratings before installation.
ALT +
positive · input
ALT + (same stud)
positive · input
PV +
positive · input
NEG − (common)
negative · input
BATT +
positive · output
NEG − (common)
negative · output
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 DCC50S.
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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