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Recommendation for 3 battery configuration

Old 08-17-2011, 03:10 PM
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Default Recommendation for 3 battery configuration

I recently purchased a used 24' CC with Twin 150 Merc's and need some recommendation on the wiring of the batteries. The boat has 3 batteries that I plan on replacing as they're about 5 years old and have given me trouble starting the engine on the way back from trips.

The 3 batteries are 2 Starting and 1 Deep Cycle and are managed by one On/Off Switch and a 1/Both/2/Off Swtich. One of the Starting batteries is conneted to a GUEST On/Off switch which powers the Port engine. The other switch is connected to the other Starting battery powering the Starbord engine and the Deep Cycle battery for house I suppose. I don't know if the batteries on this switch are in parallel or series.

I can't tell or haven't been able to find a Regulator or Automatic Charging Relay. I do have a 20 Amp 3 Bank ProMariner Charger connected to each of the batteries. There is also a Solenoid that some of the batteries are connecting to but I have no idea what it's for.

Since I'm new to boating right now I'm just taking the boat out for some cruising to sandbars close to shore so my underway time is usually <45 Minutes. Once I get comfortable with the boat and navigating I'll be going out further for some fishing. My main concern are the batteries leaving me stranded (yes I have SeaTow).

I'm powering standard equipment, GPS/FishFinder/Radar, Radio, Washdown Pump, Bilge, Lights although I don't do much night navigation.

What type of battery combination/ configuration would you recommend based on my usage?


Also here are some questions

1. What's the Solenoid for?

2. Can I get 2 Deep Cycle batteries to power house and just have 1 Starting battery for both engines? Do I need to set the 2 batteries in a Series or Parallel? Could I still use those to start the engines in a pinch?

3. How can I ensure all the batteries get recharged while underway?

By the way I'm new to boating so this stuff is all new to me but I'm reading and trying a lot.
Old 08-17-2011, 03:54 PM
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Go with a battery combiner/VSR. I had a similar set up. 2 starting batteries and a house battery.

A simple explanation:
Each starting battery charged independently from the engines. I had 1 connected to the house battery throught the VSR. As I ran, it brought my starting battery up to 13.5 volts then sent the charge to the house battery. When engines stopped charging and all batteries were up to 13.5 volts, it disconnected as to not draw down the starting batteries. There are a few good brands. I had a Yandina for many years without any issues and when it finally blew they sent me a new one. I believe BlueSeas and BEP also make them, All are really good.
Old 08-17-2011, 05:30 PM
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You might want to take a look at the targetcharge from wells marine

http://www.wellsmarinetech.com/targetcharge1.html


It takes the guess work out of charging batteries
Old 08-17-2011, 07:38 PM
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Originally Posted by MTS Sportfishing View Post
Go with a battery combiner/VSR. I had a similar set up. 2 starting batteries and a house battery.

A simple explanation:
Each starting battery charged independently from the engines. I had 1 connected to the house battery throught the VSR. As I ran, it brought my starting battery up to 13.5 volts then sent the charge to the house battery. When engines stopped charging and all batteries were up to 13.5 volts, it disconnected as to not draw down the starting batteries. There are a few good brands. I had a Yandina for many years without any issues and when it finally blew they sent me a new one. I believe BlueSeas and BEP also make them, All are really good.
I have the BEP unit, with the VSR's (voltage sensitive relays). Works great. As stated in posting above, when your engines are shut down, the system isolates the start batteries for both engines, so they aren't drained by a light or something else left on in the boat. When the engines are running, the VSR for each engine first charges the starting battery for that engine, then switches to charge up the house battery. Wire your bilge pumps that are on float switches directly to the house battery, so it works with all engines and other switches off.
I would recommend one high capacity starting battery for each engine, and one deep cycle for the house battery. The BEP cluster has switches for each battery, plus a parallel ing switch. No need for the Guest ON/OFF switch, or any ACR's. The BEP cluster is all that's needed.
Old 08-19-2011, 08:24 AM
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You don't really need two starting batteries, you never have to start both engines simultaneously. Use a single battery for starting with both engines on it. Take the second starting battery and put it in parallel with the house battery for extra capacity where you need it.

Connect the two battery banks together with a Combiner100 for about $65 and you're done. One or both engines running will charge all batteries and the Combiner will prevent the house batteries draining current from the starting batteries, even if the engines are running and house loads are too high for the alternators to support.

You can add a $20 manual parallel switch between them for emergency starting.

If the total alternator output is over 100 amps you will need the Combiner160 instead of the Combiner100.

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