[CA] [CA11] Powering small SeatalkHS network

[JPA]

I have installed an RMK9 and HS5 to compliment my Axiom 9 RV and Axiom 7 DV. I have connected the new network to temporary power and all works as expected. To permanently power the network I intend to create a single fused and switched 12 vdc circuit that includes both the HS5 and RMK9.

Q: Is this plan acceptable and if so, what amperage fuse should be installed?

[Chuck - Raymarine - Moderator]

Welcome to the Raymarine Forum JPA,

Ideally, you want your circuit to be operating at 80 percent of capacity, which is called the safe load. The recommended circuit fuse size would be determined by multiplying the total power draw of the circuit by 1.2. The power draw (watts) for each product as well as the recommended fusing for each product is specified within the respective product's installation guide. As you have suggested each product should be individually fused.

Current draw for each product may be calculated via the formula i = p / v. For the items listed, the current draw for each is

- Axiom 7 DV: 10.02W
- Axiom 9 RV: 11.98W
- HS5: 2.5W
- RMK9: 4W

Total wattage: 28.5W
Total current for 12v system = 28.5W / 12v = 2.3A.
Recommended breaker / fuse 5A / 3A