Mobile Marine Electrics and Electronics

Mobile Marine Electrics and Electronics serving the
Sunshine Coast, Brisbane and the Gold Coast

Small Craft Electrics can cater for all your boating needs. We are full time mobile rig that comes to your boat, be it on the trailer or on the water.
I am fully qualified electronics technician so you can be assured that the work done on your craft is to the highest standards.
I also work on trailers with or without power brakes, hydraulic steering and general boating issues.

There is more to joining 2 wires together !

We offer

  • Mobile service – Sunshine Coast, Greater Brisbane and Gold Coast.
  • Service specialising in small trailer craft.
  • Boating equipment & supplies.
  • Complete boat wiring
  • Electrical fault analysis and rectification.
  • Electronics and electrical equipment installation.
  • Internal plumbing and waste water management.
  • Boat trailer maintenance.
  • Hydraulics steering systems.

Please feel free to contact me
Robin ph 0408 063 064
: Click here

Does your boat have ongoing wiring problems ?

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Myths and facts on “Dual battery” setups.

Myths and facts on “Dual battery” setups.

Hi all,

I’m in the process of fitting my center console with a Dual battery system and have had a look at some of the questions and comments placed onto this web site. Just to give my comments some credibility, I have been an Electronics tech for the best of 22 years and have spent the last 12 years in IT so I hope that I can remember my Ohm’s law. Firstly the myths about how much current your electronics is drawing. If you are unable to measure the current drawn by a device or don’t have the manufacturers specs, then using the rating of a fuse is a poor indication of how much current the device draws. There is NO hard rule or formula on manufacturers as to how they rate fuses. If a piece of equipment has a 5 amp fuse (depends on type of fuse) then you can only assume that the current consumption of that device once it has settled down would be 40 – 50% of that i.e. 2 amp. So when I see people place comments on the web about a sounder using 5 amps I think that is a bad guess. I have had a look at the manuals of some of the popular Sounders, GPS’s and Radio’s and this is what I have found.

 battery switch bank c/w VSR

Furuno 600L color sounder                      1.3A with full backlighting on

Humminbird Paramount wide sounder      0.6A (No specifications figures available)

Lowrance LCX-15MT GPS/Sounder          2 to 3 A (No specifications figures available)

Navman 4500 sounder                            0.8 A with full backlighting on.

Garmin 182 GPS                                   0.4 A

Navman 5100 GPS                                 0.6 A with full backlighting on

Icom M45 VHF radio                              0.8 A in standby. 6 A in high power Tx.

GME GX294 27 Mhz                              0.35 A in standby, 1.6A in Tx

OK you can see that the real power users if only for a short period of time are the transmitters in radios, GPS’s have no power circuits in them and as such use bugger all power. Sounders, well some use more than others.

 Now for the outboard myth. For those who have a 4 stroke outboard, you may think that it can put out some colossal amperage and charge your battery quickly, WRONG. The modern alternator charging system is designed to be kind to batteries. The system relies on the condition of the battery itself to determine the current flow, only the voltage is regulated. A discharged or partly discharged battery will consume a relatively high current for a short time only until it reaches a state commonly referred to as “surface charged”. The current it demands then drops to a lower value, typically around 5 amps. This equates to a 100 amp/hour battery that is half flat, taking 8-10 hours of engine running time to fully charge. In a situation when power consumption may average 5 amps constant, the total capacity of an auxiliary battery may be used in less than one day. Running the engine for a short time (even up to two hours) WILL NOT come near recharging that battery.

 As for 2 stroke outboards, most like my Yamaha 70 have a rectifier and are only capable of delivering only about 5 amps. Maybe the 4 stroke has the edge over the 2 stroke as it is able to bring the battery to the “Surface charge” quicker, it’s chalk and cheese.

After doing all this web browsing I have come to the conclusion that I will be leaving my starting battery which has a CCA (cold cranking current) of 700A as is, and adding a lower current deep cycle battery as the auxiliary. I’ll be employing a ‘BEP battery management cluster’ with a voltage sensitive relay. In my case the wiring changeover should be relatively simple as I wired a separate cable form the main isolation switch to run all the electronics and lights. This cable will now come from the auxiliary battery. As can be seen from the figures that I  have provided, current drawn from an auxiliary battery for a typical setup would be around the 3 to 5 amp mark and maybe double that if out at night with navigation and cabin lights on. I hope this has cleared up some of the guesswork that seems to be rampant.

For more imformation see

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Mobile Marine Fitouts

Mobile Marine Outfits

Outfitting your boat with boat gear is almost as exciting as choosing the boat itself. Of course the first boat outfitting you need to do is with safety equipment. In addition to obvious safety devices (such as life jackets), the first electronic safety item you should get is a VHF marine radio.

For help on your marine fitouts try

Fixed mount VHF marine radios have access to all U.S. and also international VHF channels (marine only). Channel 16 should be monitored whenever the radio isn’t being used for communications. Some boaters add a handheld VHF radio as a backup. They’re very useful in the event of accidental sinking because they are waterproof and can be operated with one hand. Your primary VHF radio should be considered essential boat gear

You probably know how hand GPS systems are for your car, and they are just as useful on the water. You may well come to think of your marine GPS system as essential boat gear. Many systems record waypoints to get you back to where you started as easily as possible. Some GPS devices come with built in fish finders, making them doubly useful on-board.
While electrical equipment may not be as exciting as a marine DVD player, it is the boat gear that makes your boating experience much more enjoyable. Circuit breakers, electrical connectors, and electrical panels designed for the marine environment are part of equipping your boat with the electronics you need to keep safe, catch fish, and have lots of fun.

For all your Mobile Marine Fitouts contact Robin ph 0408 063 064
or email CLICK HERE

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Mobile Marine Services

Looking for a reliable Mobile Marine Service person?

Transportation is a very important aspect of our lives. To get from one place to another is a basic necessity, but to do it in comfort and luxury is a sign that you have ‘arrived’ in the world. It’s every rich man’s (or woman’s) dream to own a boat at some point in their lives, as it symbolizes that they are able to conquer the sea, Nevertheless, boat maintenance can be quite a hassle and also put quite a big hole in your wallet, as the parts are not cheap and not easy to find. Many boat owners tend to stick with the most professional boat repair and maintenance they can find, creating a symbiotic partnership where by both parties benefit strongly from this arrangement. As is known in this industry, good service begets customer loyalty, this is what Small Craft Electrics offers

A great mobile marine service maintenance / electrics specialist would have extensive experience in providing this service. If they are dedicated in customer service, they would even offer mobile boat repair services by bringing their services to any  home in the area if customers require them to do so. A good marine service maintenance specialist would not aim to make the highest profits possible but instead have sincere interest in helping less knowledgeable boat owners to maintain and take care of their precious marine investments.

I offer a mobile marine service. My contact number is 0408 063 064
or email me CLICK HERE


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Caring For Boat Trailers

Some Help full tips to care for your boat trailer

So often, taken for granted boat trailers can destroy your fishing outing even before you get to the water – if you let them. The key is in maintenance.

Buying is basically a matter of ensuring that the trailer and the boat are matched in size, and that the trailer is adequately proofed against corrosion. But make sure a dealer does not fit a smaller-sized trailer to save money. That could void a boat’s warranty. The hand winch wire should be strong enough for the job and any electric winch should be able to be wound by hand if necessary. Make sure safety chains are fitted in case the coupling lets go, and check that the trailer is balanced with the boat on board.

Once you get the trailer home, you tend to forget that it will require maintenance. Often boat owners don’t carry a spare trailer wheel, and launch their boat as quickly as possible without letting the wheels cool down. The wheels contract when the cold water covers them, and take in a small amount of salt water. The return run at high speed, multiplied by a few weekends, finishes off the bearings. And so on. Treat the trailer well, with rust stoppers and non-drying lubricants. Give the springs and bearings particular attention.

For best results, turn the trailer over so you can get at every part. Remove the split pins and axles of all the rubber rollers. Grease the bearing surfaces of the bracket and use light oil on the axle/roller surface. This saves roller replacement. Springs should be soaked in grease or a preparation which sprays on and never sets hard. Extend the winch wire to its limits and oil it. It will last longer. If the wire begins to produce sharp ends it is time to replace it. Careful visual appraisal of the tyres and electrical wiring is well worthwhile.

More than half of trailer troubles come from mistreated wheel bearings. Grease and clean the wheel bearings, and make sure this is done twice a year if you do more than average distances. This should be done even more often if you regularly submerge the wheels. Better still, when you are launching the boat, run the trailer back only far enough to let the water lap onto the wheel rim.

I’m sure if you do your maintenance on a regular basis, you will save money on parts, and enjoy a trouble-free fishing experience.


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