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Old 20-08-2011, 07:21   #31
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Re: Battery for Marine Air CoolMate / 5000 btu

With the engines supplying most of the power and the inverter cutting off at 11.8 volts it sounds like this is a viable system. He isn't trying to keep the cabin cool over night, just when he is out fishing and the engines are running a lot. If you want to upgrade your battery charger, take a look at the Newmar Phase Three line of chargers. They are very reliable. If you decide you want one please let me quote you on it.
Here is a link to their website: DC Power Onboard with Newmar's Phase Three Smart battery charging technology is now available in a wide range of power levels, allowing you to select the right size, features and flexibility you require for virtually any application from small recrea
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Old 22-08-2011, 05:39   #32
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Re: Battery for Marine Air CoolMate / 5000btu

Here's an update:

The Sinergex inverter starts a warning tone at 10.7 volts and shuts down at 10 volts... Not 11.7 as I previously stated. At 6 1/2 hours, the tone was on, but the AC was still running. I shut it off, so the gauge probably said 10.7
I was a bit occupied with catching Mahi, so I didn't spend to much time down there.

Yesterday, I ran the AC for 3 hours non stop. The volt meter showed 12 volts when I shut it down. I found a schematic that shows the starboard engine supplies power to the AC battery, but here's the weird part. I ran the boat for another 4 hours and the gauge stayed at 12 volts. If the starboard alternator was charging the AC batteries, shouldn't it have come up from 12 volts?

Now, the starboard wet cell battery is a bit old, and it may of been taking priority after I shut down the AC system... But I would think it would of gone up a little.
Thanks for the info on the charger... How much do these things cost?

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Old 22-08-2011, 07:59   #33
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Re: Battery for Marine Air CoolMate / 5000btu

100 degrees -- yikes!

If you are really into using your batteries so much, get a Victron battery monitor. It's like a fuel gauge for you battery bank. You'll be able to tell at a glance how much charge you have left in your batery bank.

Checking the voltage doesn't work unless you let the battery sit disconnected overnight. A good anology is pouring molasses into (and out of) a big jar. You have to let it sit overnight to see where the level really is.

For the money, the Victron is the best peice of equipment we've bought. Get one and you'll know what's going on with your batteries.

Email address is: b-cf "at" hallmont "dot" com

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Old 21-10-2011, 21:42   #34
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Re: Battery for Marine Air CoolMate / 5000btu

Another update for anyone out there going this route...

The A/C is working great. It runs as long as I've needed it on any trip and has made the cuddy cabin very comfortable for my kids to use.

The only issue is when I run both engines with the AC on, then turn off the starboard engine (the one that supplies 35 amps to the starboard battery and the A/C bank) I have a hard time starting the starboard engine. I'm not sure if the AC bank is linked through and is sucking extra volts out or if there is another issue.

These batteries are old, and I'm thinking of updating them to AGM's like the A/C bank have... might help.

Bottom line.. I'm very happy with this setup.

Thanks all!


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