24v alternator/starter to 12 volt instruments/lighting

[omega2]

I am lost here, I am contemplating replacing the engines and they have 24 volt system, the rest of the boat is 12 volt, how can I run these together? Plenty of battery power and if needs be I can use the 12 volt system off the old engines, but I have found that 24 volt starters appear to have more umph.

 

[coopec]

I am lost here, I am contemplating replacing the engines and they have 24 volt system, the rest of the boat is 12 volt, how can I run these together? Plenty of battery power and if needs be I can use the 12 volt system off the old engines, but I have found that 24 volt starters appear to have more umph.

I'm a little confused: Are the new engines 24V or the old?

 

[halcyon]

I am lost here, I am contemplating replacing the engines and they have 24 volt system, the rest of the boat is 12 volt, how can I run these together? Plenty of battery power and if needs be I can use the 12 volt system off the old engines, but I have found that 24 volt starters appear to have more umph.

Run both engines from a single 24 volt battery bank, charged from a 24 volt alternator on one engine, fit a 12 volt alternator on the second engine linked to service bank. Or fit twin alternators to both engines, each charging a 24 volt start battery via the 24 volt alternators, and service bank via 12 volt alternators.


Brian

 

[Deleted member 36384]

I have a 24V system, engines lamps, windlass. However, all my instruments are 12V. The 12V is run from DC voltage converter, for example: -

http://www.multimarine.pt/loja/index.php?cPath=91_107

or

http://www.bepmarine.com/home-mainmenu-8/product-751/dc-dc-converters

The 12V flows into a standard, off the shelf distribution panel with built in circuit breakers.

My engine has twin 24V generators and, of course, 2 x 24V regulators connected via split charger diode thingy. The batteries: domestic bank, 4 x 6V batteries in series; engine starter 2 x 12V in series.

 

[coopec]

The yacht I am building has 12V for starter motor, lighting/fans, fresh-water pump, navigation lights, inverter and 24V for main bilge pumps, fridge/freezer, macerators and anchor winch. The 240 power powers infra-red microwave, mini washing machine, kitchen utensils, bread-maker. I will have a 12V battery bank and a separate 24V battery bank. I plan to have a 60A 24V alternator and a 120A 12V alternator running off the main engine. I have the idea I will use car air-conditioner clutches on each alternator so that I can switch them on or off. ( I don't know whether this is feasible)

 

[omega2]

I'm a little confused: Are the new engines 24V or the old?

the "new" ones are 24 volt.