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Old 30-10-2014, 20:01   #1
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24 volt Victron Quattro With 12 Volt Alternator/Starter On a Cat?

Does anyone use a 24 volt house system on a boat with a 12 volt starter/engine system?

I'm thinking of how I would like to set my boat up when i get one and am interested on others peoples thoughts.

For a ~ 5kw victron Quattro system I think 24 volt house battery would be greatly prefered for current draw reasons from the battery. A ~ 5KW generator should be able to keep it charged when required.

If I stayed with a standard 12 volt system on the Yanmars, there would need to be many additional parts required to get charge from the alternator to the house batteries. More complexity, more things that can go wrong.

Perhaps an easier way would be a 24 volt alternator, and a step down to 12 volt to charge the starting batteries, and a 24 volt centerfielder.

Thirdly, a second alternator on the yanmar rated at 24 volts?

Or finally, would I be better to just use a 12 volt Victron Quattro and use twin, short, large battery leads to minimise voltage drop under heavy load?

I would like to keep the starter system independent of the Quattro for redundancy reasons.

It will be a lifepo4 house system.
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Old 30-10-2014, 21:10   #2
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Re: 24 volt Victron Quattro With 12 Volt Alternator/Starter On a Cat?

I use this type of system. Both motors have a 12 v alternator charging only the starting batteries. Have a 2 nd 24v altenator on the starboard engine. I have 2 inverters
1 24 to 230
1 24 to 110

I keep a small Guest 10a marine charger on board and plug in to the inverter for an emergency charge of the starting batteries. Generator is Paguro 5kw 230v

It Works fine
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Old 31-10-2014, 07:19   #3
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Re: 24 volt Victron Quattro With 12 Volt Alternator/Starter On a Cat?

Moonos-
Easy solution: house bank is 24V as planned and starting battery and all engine room systems; e.g., fire suppression are 12V. Install a battery to battery (B2B) charger between the house and the starting batteries. Done. One manufacture's offering is made by Sterling: 24v to 12v battery to battery charger
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Old 31-10-2014, 19:14   #4
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Re: 24 volt Victron Quattro With 12 Volt Alternator/Starter On a Cat?

Thanks guys, 2 very good examples.

It is early days so far, but I have some good ideas to look into further.
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Old 01-11-2014, 02:16   #5
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Re: 24 volt Victron Quattro With 12 Volt Alternator/Starter On a Cat?

I have a 24V Victron Quattro 5KW (Option/Modification on Zanshin - Inverter/Charger) aboard for the big house bank, and have a small 12V house bank (for VHF, stereo, 12V plugs, etc.) as well as a 12V starter battery for the main engine and the generator. The main engine has both a 12V and a 24V alternator and when I run the generator the 12V systems are also charged indirectly through the 220V AC system and the batteries' respective 12V chargers.
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