Mabru Power Systems · Sea Air 5000 BTU 12V DC
Mabru Sea Air 5000 wiring diagram
12 V marine air conditioner. Verify the SC5DC model plate: its current sheet specifies 17–27.9 A cooling, 20–33.8 A heating and the manual calls for 50 A protection. Catalog operating and surge currents are planning estimates; pump wiring and drain-pan bonding are separate.
- Rated power
- 336 W
- Continuous draw
- 28 A
- Surge current
- 45 A
Wiring diagram
How the Sea Air 5k 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
- 10 mm² · 8 AWG
- Example fuse
- 35 A
- Design current
- 28 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 10 mm² (8 AWG) marine cable
- Terminations for 10 mm² cable, matched to the equipment's screw terminals, leads or studs
- 35 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.
Reviewed against manufacturer family documentation (rev. MBR250801MNLPDFP12 — manufacturer link titled Installation Manual 2026), checked 2026-10-01. Exact variant details still require confirmation. Manufacturer documentation →
Confirm the SC model
The catalog's Sea Air 5000 name lacks a manufacturer SC model number or production revision. The closest documented marine unit is SC5DC, a 5,000 BTU/h, 12 V DC self-contained air conditioner. Confirm that designation on the installed label before applying these instructions. The official specification sheet gives 17–27.9 A cooling and 20–33.8 A heating draw for SC5DC. These are operating ranges, not a verified compressor-start surge; the catalog's 28 A load and 45 A surge remain planning assumptions.
Power, controls and protection
The drawing's `+` and `−` represent the full-current DC supply and return. On the manufacturer board diagram, use the terminals marked DC 12V POWER; the separate PUMP output, display, sensor and compressor-control connectors have different functions. Do not connect the supply to a control or pump terminal. The installation manual specifies a dedicated 50 A protective device for SC5DC, with a separate 5 A ATC fuse shown on the DC pump branch. Select the feed cable for installation ampacity and no more than 3% voltage drop, calculated using the complete out-and-back length. Use the required crimped fork/ring terminals in the electrical box.
Grounding and seawater installation
The drain pan's green grounding screw needs the manufacturer's ship-ground/bonding connection; the two DC ports do not depict it. Keep the control box in return airflow for cooling. The current SC5DC sheet calls for at least a 4-inch duct, 64 square inches of return grille and 16 square inches of supply grille. Its seawater hose connection is 5/8 inch inside diameter. The included 350 GPH DC pump is not self-priming: install the intake, seacock, strainer and pump with the manual's below-waterline arrangement and confirm continuous overboard flow before running.
Commissioning and drawing limits
Use the display to select cooling, heating or fan operation, then check airflow, drain flow and the seawater discharge. The diagnostic guide identifies 11.5–14.2 V as the operating range relevant to a DC voltage fault; verify the fitted controller's limits against actual charging voltage. The model does not simulate the pump branch, bonding, controls, refrigerant circuit, condensate drainage or thermal performance. Marine SC instructions cannot be replaced with the similarly named RV rooftop manual. Installation in an engine room is prohibited, and these units are not ignition-protected.
Sources: marine installation manual, printed pp. 4–5 (PDF 5–6), electrical pp. 21–23 (PDF 22–24), startup p. 26 (PDF 27), fault table p. 34 (PDF 35); SC specification sheet, PDF p. 1, code MBR250923SSPDFP10.
Fit check
Connect it to the rest of your system.
Describe your setup to draft a system with Sea Air 5000 BTU 12V DC 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
12 V marine air conditioner. Verify the SC5DC model plate: its current sheet specifies 17–27.9 A cooling, 20–33.8 A heating and the manual calls for 50 A protection. Catalog operating and surge currents are planning estimates; pump wiring and drain-pan bonding are separate.
- Rated power
- 336 W
- Continuous draw
- 28 A
- Surge current
- 45 A
Terminal map
Catalog connection points, current direction and planning limits. Check the manufacturer's pinout and connector ratings before installation.
+
positive · input
−
negative · input
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.
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Plan your installation with Sea Air 5k.
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