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28 monterey cruiser

inverter

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I have 4 heavy duty batterries wired 2 per bank (2 selector switch) but was told I could get up 8 hours+ of use for an overnight stay with no dock power but I am not getting more than 2 hours the inverter is from West Marine but I have not changed the factory charger or alternator -262 cruiser 2000 I know anyone answering this will need battery performance and inverter size (I will supply that when I go down to the boat later) I believe I have more than enough power in all catagories -I think it's the wiring method that is causing the problem or the charger -everything does work but not for the time I want 8 hours+

What advice would you have to get me to where I want to be (power is 7.4 mercruiser with Bravo III duo props -like new condition )?

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I have 4 heavy duty batterries wired 2 per bank (2 selector switch) but was told I could get up 8 hours+ of use for an overnight stay with no dock power but I am not getting more than 2 hours the inverter is from West Marine but I have not changed the factory charger or alternator -262 cruiser 2000 I know anyone answering this will need battery performance and inverter size (I will supply that when I go down to the boat later) I believe I have more than enough power in all catagories -I think it's the wiring method that is causing the problem or the charger -everything does work but not for the time I want 8 hours+

What advice would you have to get me to where I want to be (power is 7.4 mercruiser with Bravo III duo props -like new condition )?

Need more information here. What are you trying to power for 8+ hrs that needs 110v? If your power needs are just 12v items, then with a little bit of conservation, you should easily be able to get 8+ hrs. I know I do.

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As you suggest, you really need to know more info about what you have, capacities, ratings, charger details, air con model / current draw etc.

How many start batteries do you have and how many house batteries to you have?

Any idea why you have "4 batteries wired 2 per bank"? This sounds a bit odd if they are all house batteries

What else do you run when the a/c is on? Refigerator/s, TV (inverter driven or 12V DC), coffee makers etc.

Are all the batteries flat after 2 hours? Have you measured any voltages of individual batteries (i.e. disconnected from each other) before and after use?

Let me know when you get the information

Ian

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You are trying to run your 5,000 btu A/C sytem with an inverter? You might get an hour before the batteries go dead! Is this for at a dock where you can't run your generator or a Honda type generator?

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On my 242, I use a 1200W Xantrex inverter to run a Mermaid 5,000 BTU A/C while under way and for short periods of time (about an hour) while docking for lunch. I have never tried it overnight, but I recall the Mermaid factory saying that you need about 400 amp hours of battery power. Their website is www.mmair.com

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