30amp to 50amp

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zzzingpow

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New to me 2017 Express 350 yams has 50amp shorepower cord however my slip at the marina is 30amp. (Vessel on the hard for bottom paint, zincs etc...since arrival). 110 at yard so how do I tender batteries on hard. If there is a way please be thorough.
I understand utilizing an adapter 30F to 50m to vessel however I don't know the shortfalls, possibly no a/c I really don't know. Can anyone educate me.
Thank You.
 
zzzingpow said:
New to me 2017 Express 350 yams has 50amp shorepower cord however my slip at the marina is 30amp. (Vessel on the hard for bottom paint, zincs etc...since arrival). 110 at yard so how do I tender batteries on hard. If there is a way please be thorough.
I understand utilizing an adapter 30F to 50m to vessel however I don't know the shortfalls, possibly no a/c I really don't know. Can anyone educate me.
Thank You.
Click to expand...
 
I'm sorry meant to convey 30 to 50 at the marina as well seeking advice to tender batterys in the yard
 
What kind of batteries? AGM or wet-cell?
What's the outside temp?
How long on the hard?

If AGM then just disconnect the negative and leave them alone, also for 6 months
If wet-call then same, disconnect negative and leave them alone, if more then 2 months on the hard then charge every 2 months.
Buy a 20-50W solar panel and a quality charger with trickle charge function and fix it to your boat, it will charge all batteries
Chris
 
If I understand you correctly the boat has a 50-amp power connection. You can use the cable below to combine/break out two 30-amp phases. You can then use a 30-amp to 15-amp/20-amp standard plug to power one of the boat phases that your boat battery charger is on.

 
Agree with hookup1, but a simpler way is to simply purchase a 50 amp to 15 or 20 amp adapter, plug and use a long, heavy duty extension cord. The longer your run from your 115 V power source on the hard to your boat requires the heavier extension cord. Your boat is only single phase 115V AC and that should run most everything. The air conditioner cannot be run anyway since there will be no water for it to cool. Other high load items stove, etc will not be needed, but your battery chargers should be a very minimal drain and work fine on the hard. Once at the marina, there are 50 amp to 30 amp adapters that will work just fine. Modern smart battery chargers are designed to be left on continuously and will maintain your batteries, assuming you have either lead acid or AGM.
 
I think that if you have the 50a shore power cord, this adapter as referenced to by wspitler can be used at the power pedestal 30 a service and then to your 50A extension.

I's less expensive than Marinco and probably worth a try.
You are still limited to 24 amps continuous or thereabouts. If you have any 240 volts loads, they will not work (you probably don't have any)
 
Thank You for the advice. I found a good adapter at Minnies in NewportBeach. They've many Marinco for great prices.
30 amp at slip is OK, I don't require a/c. Tender batts is most important. Thanks again.....
 
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