Shore power quandary

coopec

N/A
Joined
23 Nov 2013
Messages
5,216
Visit site
Do-It-Yourself: Shore Power

Today’s topic is Shore Power Systems: what they do for boaters, how to ensure compatibility with different electrical sources as you cruise, and how to avoid some common problems.


Troubleshooting shore power

Your shore power system is engineered for years of reliable service, but the marine environment can cause even the best-designed products to fail. As mentioned earlier, the majority of dock power troubles can be linked to two simple problems: overheating and saltwater immersion.

If you suspect a bad connection, turn off the dock power at the outlet and unplug the dock cord couplings at the outlet and boat. Examine the ends of the shore power cord. Look for discoloration or melting around the blades of the plug (male end) and around the slots on the connector (female end). Look at the face of the inlet on the boat, and check for discoloration or melting around the blades and the inlet. Check the receptacle on the dock and look for deterioration or discoloration around the slots.
Shore Power
Causes of overheating

Boaters often suspect that they’ve caused overheating by overloading the shore power circuit, but the folks at Marinco say that is rarely the case. Overheating generally results from one or two conditions: corrosion on the metal blades or contacts, or bad connections between the wiring device and the wires connected to it. Badly corroded contacts or blades are typically caused by exposure to a corrosive environment (usually salt water). If the end of your cord gets dropped into salt water, and isn’t thoroughly cleaned and dried, the contacts corrode, causing a poor electrical connection and overheating.

Bad connections between electrical terminals and a wiring device can usually be traced to loose termination, corrosion on the wires or terminals, or wires that are not stripped properly so that the wire insulation is under the terminals. A bad connection results in overheating of the terminal, and this is often visible on the face of the device.

Replace the connector immediately if you find signs of overheating. Be sure to inspect wire ends when replacing connectors. Make sure they’re clean, with no signs of corrosion or overheating. Marinco suggests that many dock cord connectors are replaced unnecessarily because boat inlet and dock receptacle connectors are at fault. Be sure to inspect all components with equal care.

If your dock cord connector gets dunked in saltwater, disconnect quickly and rinse well in freshwater. Dry thoroughly before use (Marinco recommends several days of drying). Afterward, spray the contacts with an electrical contact cleaner to displace any remaining water

http://www.westmarine.com/webapp/wc...1&storeId=11151&page=Shore-Power#.UwVZQIWXgR4
 
Last edited:

KellysEye

Active member
Joined
23 Jul 2006
Messages
12,695
Location
Emsworth Hants
www.kellyseye.net
When I kept our boat in Burnham on Crouch marina the cost of electricity was way above the domestic price as you are a captive market. It was in Lymington marina too. Could that be the case?
 

jackho

Member
Joined
22 Mar 2003
Messages
502
Visit site
I would guess your heater is the issue. It's set too high - stat. should be fully anticlockwise. Is probably coming on at night when temp is lowest. Even 6hrs over a 24hr period will consume 3 units (KWHrs) a day (assuming it's 500w rated). At approx 18p a unit thats 54p a day so possibly £4 week with your charger etc.
Soon mounts up???
 

Talulah

Well-known member
Joined
27 Feb 2004
Messages
5,809
Location
West London/Gosport
Visit site
I've had a similar experience with a Victron battery charger that had quite a substantial idle load on the mains. So it kept the batteries happy but wasted a lot of energy in the process. This was noticeable because the housing of the charger was quite warm 24/7 even with the batteries in float-state. As far as I could determine there was nothing malfunctioning on the charger so it seemed a result of poor design.
It has now been replaced with different brand charger.

A friend of ours had the same problem. A phone call to Victron revealed a known problem. The unit was modified to fix it under warranty.
 
Top