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Go Back   SailNet Community > On Board > Gear & Maintenance > Electrical Systems > Shore power vs battery while at slip
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Thread: Shore power vs battery while at slip Reply to Thread
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Topic Review (Newest First)
03-28-2012 10:57 PM
asdf38
Re: Shore power vs battery while at slip

Quote:
Originally Posted by hellosailor View Post
Scott, if your 12v loads are light enough so that the charger is really powering them and the batteries are just watching the show, then there's no downside to doing it that way.

OTOH if your loads are actually pulling down the batteries, that's still using up discharge cycles. In which case I'd just beef up the charger to prevent that.

How does the Bob Marley song go? "No AC, No Cry..." ? :-)
Right and a way to check would be to monitor the voltage. If you turn off the charger you'll see the voltage from the batteries alone. If when the charger is on the voltage stays above this then any power you're drawing is off the charger. If it goes below then you're pulling some current from the battery.
03-22-2012 11:12 AM
PBzeer
Re: Shore power vs battery while at slip

I keep a small (easily stowable) desk lamp on board for extended time at the dock. I also have a heat lamp, with the silver surround, that I put a regular bulb in to hang over the range, during those times. For a one or two night stay, I don't use them.
03-22-2012 08:51 AM
Minnewaska
Re: Shore power vs battery while at slip

Is it lithium batteries that will retain a memory of not discharged routinely? Maybe NiCad. Someone will know.

In any case, i don't think there is a standard wet, gel or agm house battery that doesn't actually prefer to be fully charged for its longest life potential.
03-22-2012 12:08 AM
sailingcal21
Re: Shore power vs battery while at slip

Thanks all, good to know. I don't have a reefer...yet, and am upgrading all my interior lighting to LED so my DC consumption will be fairly light. Unless of course, I've got "the Marley" cranked up.

Scott
03-21-2012 11:29 PM
mitiempo
Re: Shore power vs battery while at slip

I live aboard and everything aboard (except 120 volt items like toaster) - lights, water pump, etc are 12 volt. Charger keeps the batteries up. All live aboards I know do the same.
03-21-2012 11:22 PM
tomperanteau I too sometimes run off 12v only while at the marina. Good idea to test systems for going off shore.
03-21-2012 11:15 PM
hellosailor
Re: Shore power vs battery while at slip

Scott, if your 12v loads are light enough so that the charger is really powering them and the batteries are just watching the show, then there's no downside to doing it that way.

OTOH if your loads are actually pulling down the batteries, that's still using up discharge cycles. In which case I'd just beef up the charger to prevent that.

How does the Bob Marley song go? "No AC, No Cry..." ? :-)
03-21-2012 02:43 PM
sailingcal21
Re: Shore power vs battery while at slip

Quote:
Originally Posted by DRFerron View Post
Why would you not use shore power if it's available? Curious as to your reasoning.
Biggest reason is to not have a separate lighting system for shore power use. While a guest on some boats, I've seen small florescent and other 110vac type fixtures which lead me to ponder the question.

Thanks for the replies, I was just doing a sanity check to make sure that I wasn't missing anything concerning a battery maintenance issue.

Scott
03-21-2012 02:37 PM
SVAuspicious
Re: Shore power vs battery while at slip

My boat is basically a 12VDC boat. I do have a diesel generator I can use to charge batteries offshore and to run air con away from the dock. Everything else except my stick blender and vacuum sealer is 12VDC. All good.

I'm not sure I would have been so adamant about sticking to 12VDC if I was only sailing on weekends, but we each make our own choices.
03-21-2012 02:33 PM
btrayfors
Re: Shore power vs battery while at slip

Scott,

Yes, what you're doing is just fine.

Bill
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