24/7 Fuse Block Draining Battery

[marksandyham]

I rack store my R27OB. The rack building is closed so I get no sun on the solar panel and there is no shore power available. After a week the start battery is low. Still will start the engine but has been drained below what is good for long battery life. If it is stored for 2 weeks it will not start the engine.

Any ideas how to address this?

I can pull fuses however that is a PIA. I was considering installing a battery switch to kill power to the 24/7 panel when the boat is out of the water. I know this also kills radio memory, I don't have stations saved so not a problem. and the propane detector, valve is always off unless we are using the stove so not a problem

 

[Submariner]

What year model is your boat?


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[marksandyham]

2019 R-27OB

 

[Submariner]

2019 R-27OB

The early boats had the 24/7 loads off the engine battery. The new ones have the 24/7 loads ran off the house battery, which is a larger battery bank and are deep cycle.

But either way, the battery will drain without solar or shore power unless you pull fuses.

It's probably fairly easy to move the 24/7 fuse block from engine to house as I believe the fuse block taps power directly off the engine , emergency parallel , house battery switches. (On the back of them). If so, you should be able to move it fairly easily.

'21 model year and newer I know for sure have that 24/7 fuse block wired off the house bank.


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[Submariner]

2019 R-27OB

I confirmed it this evening working on an 2022 RT27-OB.

The 24/7 DC fuse block taps it power off the back of the DC switch stack. (Engine/Emergency Parallel/House DC switches).

There's a 6AWG, red, cable connected to the back of the House DC switch. In your case, that cable would be connected to the back of the engine DC switch. Simply move the cable from the back of the engine DC switch to the back of the house DC switch. (on the "input" side of the switch, which is always hot).

I have a picture of it that I can share if you're interested. This should be a fairly easy task to accomplish.

I was installing a Webasto SmarTemp 3.0 w/Bluetooth, which is done easily by removing the DC switches (Engine/Parallel/House) to gain access behind. So I photographed and confirmed the connectivity of the 24x7 fuse block. The cable is clearly labeled "24/7 Fuse Block D".

 

[marksandyham]

Thanks Martin. I am still concerned about draining batteries when not connected to shore power or outside so solar can maintain batteries. Also this summer I will not have the boat in the water for at least 30 days. Also not need to run the bilge pump every couple minutes when on the hard.

Thinking about a lockable switch with the key on the engine key ring so I would have to turn the switch on before I retrieve the engine key. I have enough room above the existing house and engine batt switches. I also will take your suggestion and move the 24/7 over to the house bank. I have generator but still twice the AH than engine battery.

 

[S. Todd]

I always pull the fuses to our bilge pumps when we put the boat on its trailer. It spends far more days on the trailer in a year than in the water and it makes no sense to have those pumps cycling on and off every two minutes.