Beneteau 393 house battery bank issues

[Flying Cloud]

I am still struggling with optimizing my house power system, and need some advice. 

I replaced the house bank of 4 Trojan T-105 in May of 2022 with 6 Trojan T-105 PLUS 6V 225 Ah deep cycle flooded batteries.  My full (measured) battery load (which almost never occurs) is 36 amps. The bank is connected to a Xantrex True Charge 20+, 600 watts of solar connected through an EP Duo battery solar controller, and the engine alternator.  The charger is set for flooded batteries with a cold temperature setting. 

In my current configuration with normal usage my house system will last for 24 to 60 hours after leaving the dock before the voltage drop causing the refrigerator to stop working (the refrigerator is typically my benchmark). 

Last year I partially rewired the boat as a marine electrician told me my refrigerator and some other items might have bad connections which was drawing more power than I was measuring.  The effort was timely, expensive and resulted in no improvement.  

I am now thinking  that I need to replace the charger and possibly the solar controller and maybe even the alternator. I’m thinking the charger needs to be upgraded to 135 amps  or perhaps there is a different charger configuration I should be considering.  I welcome all input as I search fo ra solution

 

Thank you

 

Fair Winds and Following Seas,

Neil

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Fair Winds and Following Seas

Flying Cloud

2006 Beneteau 393

The Parker's

Skipper: Neil 

First Mate: Karen

[Jon Schultz]

I just replaced my inverter and solar controller with a victron. One of the channels of the inverter/charger was blown causing the batteries to drain quickly and caused one bank to melt when I was charging the batteries with the engine and alternator. Perhaps have an electrician double check the inverter/charger. My system was over 20 years old so it was due for an upgrade. The new display takes a lot of the guesswork out of managing your battery life. 

Good luck in figuring it out.

Jon

S/V Ramble On

Beneteau 440

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[William Eurbin]

Have you installed a good battery monitor? I find it immensely helpful in troubleshooting electrical. I have installed the vitron 702 in two of my boats, love it. The app allows you to see both input and output, so if you isolate the charging systems you can find faults. 

At night with the charger off, if you start the motor you should see the input amps from the alternator. With the engine off, turn on the charger and you should see the amps coming in from the charger. Then turn off the battery charger and in the morning as the sun comes up, you should see the solar input. 

You can test each system individually, but it takes way more time. The app also logs a history, and you can literally see the power draw from things like the cycling of the refridgerator. With this, you gain an understanding of the average power consumption of the boat, and can recognize when something fails pretty quickly.

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[William Eurbin]

Edit to my post, I installed the vitron 712, not the 702. 702 does not have Bluetooth built in. 

On Tue, Mar 4, 2025, 12:01 AM Flying Cloud <flyingc...@gmail.com> wrote:

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[Neil A. Parker]

That's a great call out. I did install a citron monitor but haven't really taken advantage of the data available.

Fair winds and following seas,

Neil

On Mar 4, 2025, at 6:20 AM, William Eurbin <inter...@gmail.com> wrote:



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[John Kukla]

My 2006 473 has a Refrigerator compressor that is also is very sensitive to voltage drops. Last season I installed a Victron DC-DC converter under the galley sink next to the compressor which maintains a constant 12v output even if the input voltage dips. That solved the compressor faults. This season I converted the AGM House bank to Lithium with new Victron Controllers and Multiples charger/inverter. I probably don't need the DC-DC Converter to protect the compressor anymore but just haven't gotten around to removing it.