Setting up for House Battery -> looking for feedback on loads

[ESGWheel]

I plan on setting up a dual battery system in my 2005 Larson 228 LXi Bowrider with a VP 5.0 GXi-E as a spring project.

Its more for a peace of mind vs. significant house loads. There are no trolling motors or bow thrusters. The most going on the ‘house side’ is the stereo and the chart plotter and it’s not one of those high amp stereos. But we do sit at anchor for most of the day with the stereo going and my wife keeps the chart plotter on to monitor anchor drag.

The batteries will both be the lead acid and of the exact same size / model for this set up using a Blue Seas Add-A-Battery Dual Circuit System kit 7650 that come with the 7610 ACR and battery switch.

I have reviewed a lot of posts on what loads to which battery and this is what I have come up with and looking for feedback. Thanks.
Start Batt Loads:

• Starter
• Engine electronics
• Trim Pump
• Blower
• Bilge pump (higher i.e., will come on only if House Pump overwhelmed)
• Nav Lights
• Gauges
• Horn

House Batt Loads:

• Interior lights
• Dock Lights
• Chart Plotter
• Stereo
• VHF Radio
• USB Ports
• Induction Charging Stations
• 12V Cigarette Lighter Sockets (used to blow up rafts)
• 2nd Bilge Pump (will come on first)

 

[alldodge]

Interior lights - depends on what type and how many lets say 20W
Dock lights - won't be used just sitting, unless your talking under water lights or other type
Chart plotter - depends on which one/size lets use 3A or 36W
Stereo - just the head unit or has some kind of small amp?
VHF - up to 7A if transmitting or maybe 80W
Inductive phone charger - 30W for the new type
12V outlet - depends on how often it's used
2nd Bilge pump - depends on size maybe 50W

 

[cyclops222]

What do you want to cause a SURPRISE. Of a no starting of the engine condition ?
I never put anything on with the engine starting battery. Easy to trouble shoot a sudden bad starting engine battery.
Simply go to BOTH BATTERIES of the big battery switch & head for the home dock.

If you have a sudden death of the engine battery ? I would remove & tape up the only heavy cable attached to the engine battery. Tape over the bare cable end for safety. Switch the big battery switch both. and drive home safely.

 

[dingbat]

What is the goal of your rewire?

In my case, the goal is redundancy. Brought about by a situation on a friend’s boat where we lost his starting battery (shorted cell) 20 miles out of port in the waining hours of a mid-February day

The motor is wired to the switch, not a battery. That way I can use either, or both batteries to start the motor.

Primary battery, deep cycle:
Trim tabs, bilge pumps, primary navigation instrument feed (chart plotter and VHF) and navigation lighting.

Secondary battery, deep cycle:
Stereo, spreader lights, wash down and bait well pumps, power feed to fish finder, radar, back up navigation devices and accessories.