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I am installing a new Stereo System, so I needed to install a second battery first. My boat came with 1 battery on the port side, and I am adding the second battery to the starboard side. House battery will be on port side, Starting battery will be on starboard side. I used the Blue Sea Add a Battery kit and a Promariner ProSport 20 Battery Charger. I layed it out on 1/4 inch starboard material (12x27) and drilled my holes. Then I used the starboard material to drill the holes through the fiberglass on the boat. I mounted it to the bulkhead in front of the engine, thru bolted, not screws. I used 100 amp circuit breakers between the batteries and the ACR, so when the boat is in storage or not used very much, I can hit the circuit breakers to disconnect and that will keep from draining the battery via the ACR sensors. I used 4 gauge wire, because my alternator is 75 amps, so Blue Sea recommends 4 gauge wire and 100 amp fuses. I used an inline fuse on the ground wire from the ACR, 10 amp. I have not installed the Charging outlet yet.

1. Blue Sea Add a Battery Kit. (7650) $120. West Marine.
2. Promariner ProSport 20 Battery charger. (43020) $230. West Marine.
3. Atwood Battery Tray, matches what is in my boat. (9091-5) $14. Amazon.
4. Marinco on-board Charging Outlet. (150BBIW) $23. Amazon.
5. (2) Scorpion Circuit Breakers 100 amp. (XICB-100) $28. Amazon.
6. Blue Sea Waterproof in-line ATO/ATC Fuse holder, for ground wire. $7. Amazon.
7. Blue Sea LED Indicator Light. (8172) $5. West Marine.
8. Ancor Marine Grade Wire, 4 gauge, Red and Yellow, 50 ft. $78. Amazon - Atlantic Boat Supply.
9. Ancor Marine Grade Wire, 12 gauge, Red and Yellow, 100 ft. $30. Amazon - Atlantic Boat Supply.
10. 1/4 Inch Starboard material, 27 x 12 inches, white. $23. Boat Outfitters.
11. O'reilly Super Start Marine Battery, made by East Penn. (27MS) $97. O'reilly Auto parts.
I needed a starting battery, because the boat came with a deep cycle battery.
12. All Stainless Steel hardware from Bolt Depot.

More pictures!

This is so timely for me, I have purchased the second battery, the Add a battery kit and just need to buy some of the wiring and connectors. Thanks for the photos. Looks like a pretty neat job.

Great work. I just finished mine recently as well