Blue Sea 1016
Round socket mount · 5V, 2.1A total
Lower-output dual USB-A charger; tethered dust cap.
Blue Sea Dual USB Chargers: 1016 vs 1039 vs 1045
Blue Sea's dual USB-A chargers provide handy 5V charging points in RVs, boats and other 12/24V DC installations. The important choice is not just charging speed: 1016 and 1045 use a round socket cutout, while 1039 fits a Contura switch opening.
Match the charger to the panel opening
Round socket mount · 1016 / 1045
Both mount in a 1-1/8-inch round hole. The 1016 is a 2.1A-total charger while 1045 provides up to 4.8A total USB output.
Rectangular switch mount · 1039
The 1039 is designed for a Contura-style switch aperture (approximately 1.45 × 0.83 inches). It also provides up to 4.8A total USB output.
Blue Sea USB charger comparison
| MPN | Mounting | Cutout | Maximum USB output | Input |
|---|---|---|---|---|
| 1016 | Round socket mount | 1-1/8 in diameter | 5V, 2.1A total | 12/24V DC on current version |
| 1039 | Contura switch mount | 1.45 in high × 0.83 in wide | 5V, 4.8A total | 12/24V DC |
| 1045 | Round socket mount | 1-1/8 in diameter | 5V, 4.8A total | 12/24V DC |
The current manufacturer data for 1016 lists a 9–32V input range, but earlier 1016 revisions were limited to 9–16V. Check the voltage marking on the specific unit before connecting it to a 24V system.
Four installation details that affect your choice
- Confirm the power supply. The manufacturer's current models accept 12/24V DC, but an older 1016 unit can be 12V only. Check the product revision.
- Measure the mounting opening. The 1039 fits a rectangular Contura switch location; 1016 and 1045 fit the common 1-1/8-inch round socket opening.
- Plan the charging load. USB current values are combined output ratings for both ports, not the current guaranteed at each port.
- Follow the wiring instructions. Install appropriate circuit protection and verify polarity. The 1016 installation information specifies a 2A supply fuse that is not included with the unit.
These dual USB-A outlets deliver a nominal 5V USB supply. They should not be assumed to provide USB-C or USB Power Delivery fast charging. With the dust cap closed, Blue Sea's current models carry an IP45 rating.
Compare matching Blue Sea USB chargers
Each card links to the store product with more information and current availability.
Blue Sea 1039
Contura switch mount · 5V, 4.8A total
Switch-panel format with intelligent device recognition.
Blue Sea 1045
Round socket mount · 5V, 4.8A total
Round socket format with intelligent device recognition.
Related electrical installation references
For another marine cable installation topic, see the Blue Sea CableClam size guide.
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