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Old 08-06-2009, 04:54 AM   #1
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Default Charging Batteries with Generator?

OK, made an amateur mistake this past weekend. Went out in 110 degree temps, found great cove, set up shop for over 5 hours. Very fun, but when I went to start it up, just clicks. Sadly found the battery setting at "both". DOOCH! I ended up pulling the battery from the generator and attaching to the engine, fired right up.

I guess sitting all that time with the refridgerator running drained the batteries... is that logical? I was running the fridge and the sterio during this time, I don't think anything else was energized.

In retrospect, seems I could have fired up the generator and used that power to charge the batteries...

I hope to never make this mistake again, but just in case...???
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Old 08-06-2009, 12:55 PM   #2
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Default Re: Charging Batteries with Generator?

yep...rookie mistake.......but it does sound nice to camp in a cove for 5 hrs...


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Old 08-06-2009, 03:22 PM   #3
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Default How long should a battery last?

I'd be interested to see if anyone knows how long it is possible to run the fridge only before draining the house battery completely. I am heading out for a week and will be anchoring overnight so I am curious if my battery will last through the night keeping the fridge cold. I am not sure what size my house battery is, but if it helps, it is in a 2001 Maxum 2500 SCR.
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Old 08-06-2009, 03:27 PM   #4
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Default Re: Charging Batteries with Generator?

if you have a group 24..then it will be marginal if it will keep the charge for 24 hrs....but I'd look at installing either a group 27 or 1 extra gp 24.....installed parallel it will keep the fridge running for quite awhile...or ....
stick golf cart batts in....a bank of those will run your boat for a week....of course they weight about twice as much....


might wanna get the ph levels checked on those batt's....might be low ..thus not taking a full charge...

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Old 08-06-2009, 03:33 PM   #5
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Default Re: Charging Batteries with Generator?

Is there a test kit I can purchase at the auto parts store to check the ph levels? Also, any recommendation on a new deep cycle battery? I am looking on fishery supply and it doesnt seem to specify whether the deep cycle batteries are group 24 or 27.

THanks


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Originally Posted by seapuppy
if you have a group 24..then it will be marginal if it will keep the charge for 24 hrs....but I'd look at installing either a group 27 or 1 extra gp 24.....installed parallel it will keep the fridge running for quite awhile...or ....
stick golf cart batts in....a bank of those will run your boat for a week....of course they weight about twice as much....


might wanna get the ph levels checked on those batt's....might be low ..thus not taking a full charge...

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Old 08-06-2009, 06:39 PM   #6
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Default Re: Charging Batteries with Generator?

yeah...any auto parts store will have a ph tester...looks like a turkey baster...


go to costco..they have both gp 24/27 batts...cheaper than fisheries....plus a pretty good warranty..

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Old 08-07-2009, 04:16 PM   #7
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Default Re: Charging Batteries with Generator?

Thanks. So howz about my question with the genny? Do you guys think we could have charged the engine batteries using the on-board generator? Thanks
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Old 08-07-2009, 10:48 PM   #8
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Default Re: Charging Batteries with Generator?

Yes you can charge your batteries with the onboard generator. With the generator running, turn on your battery charger/converter switch on the 120VAC panel. Then watch your voltmeter on the 12VDC panel -- you should see the voltage rise up to about 14 volts, indicating batteries are being charged. I do this all the time.
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Old 08-08-2009, 12:31 AM   #9
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Default Re: Charging Batteries with Generator?

THANKS! Sadly, moving the batteries around caused me lose a pair of shorts and a great Hawaiin shirt to acid burns. Well, I learn more every day.
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Old 08-08-2009, 02:47 AM   #10
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Default Re: Charging Batteries with Generator?

I have a 2400scr with two group24's. Before I went out this spring, I ran my fridge in the driveway for 2days/nights on setting 2, then tried to start the engine when I hooked up the hose. It fired right up. I have camped all summer, overnighting etc.. and always make sure #2 is selected, just in case. We run lights, stereo, and fridge etc.. all night, and never had to switch to #1 to start. My boat is always plugged in while in the driveway though, so my batts are always topped right up ready to go.

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