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Blue Seas 7650 and Generator Connection

Old 07-25-2013, 10:42 AM
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Default Blue Seas 7650 and Generator Connection

Hello

I just bought a boat with Blue Seas 7650, a Kohler 4XZ23 Generator, a Mercruiser 496 MAG 8.1 375hp and twin batteries (and a charger connected to the generator). On the panel inside the cabin switch is on Generato (not OFF or shore power) always. and also switch of generator is on and charger switch is on.

Its a pain in the *** because my mechanic (best mechanic in country) and another electrician spent hours on fixing my charging problems and cant understand why I having this issues. Most probably something is connected in a wrong way.

Here is the setup:
When services battery goes flat generator can't start at all (means generator is staring from services battery). I think this is wrong but I want your comment on this.

Then when I am on 1 on the switch the voltage on the gauge shows from below 12V to even 10V (goes down down down after time). Why doesn't show 13V when engine is ON?
When I start the windlass to bring up the anchor and i am on 1 on the switch it continuously stops (circuit breaker goes continuously off) so only way to bring anchor up was to switch to combined.

Is anything connected wrong? Is any battery Dead? Please advice me I am desperate
2 months I have the boat now, spent so much money and cant make it working properly. I have also a multimeter so I can check anything you ask me to check (e.g. voltage coming from alternator).

I found this diagram here but does not show how to connect the generator and the charger. Can you explain how to connect them?

Ref:
http://www.bluesea.com/products/7650

Thanks once again!!!
Old 07-27-2013, 08:06 AM
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Can anyone help me on this please?;?

Also can I use more than one battery for services or only 2 batteries should be used with Blue Seas 7650 and should be identical?
Old 07-27-2013, 09:18 AM
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I have not idea what you wrote on the first post... you need to provide more info.

as for the 2nd post. you can have as many batteries as you want. as long as you only have 2 banks.


if the best mechanic and electrician in your country can't find a simple battery / charging problem. then I feel sorry for you country!
Old 07-27-2013, 09:23 AM
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also the battery switch and acr have nothing to do with the generator and charger..

they are both separate systems.

the charger connects to the batterys as normal. and should be charging the batteries when the genny is running. and shouldn't matter if the blue sea switch is on or off. or the acr is off or on.

the acr is to charge the 2nd battery while the engine is running.
Old 07-27-2013, 03:02 PM
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You should never run a battery below 12.2 volts--that is 50% discharged. Running the voltage below this more than a few times will shorten the life of the battery. So, if you have been reading less than 12 volts--you probably have damaged the battery. Most likely you need a bigger bank for the house (what I think you are calling the "services" battery). You can put in two or three batteries like you have, or you can put in pairs of deep cycle golf cart batteries. (2 x 6 volts = 12 volts). A fully charged battery should read 12.6 to 12.7 volts.

The Blue Seas switch is off (no batteries connected) On( house bat to house load and engine bat start to engine start load) Combine combines the two batteries so you can start the main engine or generator if other batteries are low. I personally prefer to have dedicated generator start battery, that is charged by the charging windings on the generator.

The house and engine start are charged thru the blue seas ACR only when the engine is running. Be sure that the house battery is charged by the battery charger (should read at least 13.6 volts when the charger is running off the generator. Both batteries should read at least 13.6 volts when the main engine is running and the Blue Seas is at "on".

Do you have shore power (230 volts?)--if so you should leave the boat on shore power when you are the dock to keep the batteries charged.

The charger runs off the 230 volt circuit--which is selected by the switch on the pannel--Generator / off/ shore.

There is some "parasitic" load which is drawing down the house batteries--this could be an inverter, lights TV, entertainment system, radio or other electronics. When you are off the boat--and not plugged into mains or shore power, turn all of the power off. Including the Blue Seas switch.

There should only be a bilge pump and the heavy wire to the bus bar (a circuit breaker or fuse first) from the positive of the battery. Some bilge pumps sample for water every few minutes and this can draw down the battery--go to a float type of bilge pump if this is the case in your boat.

Hope that gets you started on the right track.

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