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Go Back   SailNet Community > On Board > Gear & Maintenance > Electrical Systems
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  #1  
Old 12-05-2008
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Battery charging with an outboard

Hi everyone.

Thought of sharing the schematics of a voltage regulator/charge controller I have fitted to my trimaran.

The point is to regulate the voltage output from my Tohatsu OB going to the battery as well as to dissipate any excess current and/or voltage spikes that might try to overcharge the battery after it is fully charged.

The dissipation is done by means of a 12V/55W lamp that is fed throught a transistor which "opens" when the voltage reaches about 14V DC.

It has been working very well for me for quite a while now and so I thought of sharing it. Hope it is of any use to someone.

Here is the schematic




Before use there´s a calibration procedure THAT MUST BE ACOMPLISHED and which goes as follows:

1- Remove all the loads (dissipation lamps and/or lead acid battery)
2- Apply 14Vdc at the input
3- Measure voltage between TP1 and ground
4- Adjust R3 untill there´s a sudden voltage rise

And that´s it. You can now connect the dissipation loads and connect the circuit.

Notes:
-It is supposed that the output of your generator is allready rectified to DC. Most outboard manufacturers provide simple plug-and-play rectifier kits;
-Q2 must be installed in a dissipator with adequate dimensions;
-The lamp wil light and, consequently,WILL HEAT UP. Please make sure it is well away from anything sensitive to heat and in a suitably ventilated place. In my installation the lamp is on the outside of the assembly box;
-This circuit is designed for a generator with a maximum of 55W output (small outboard motors, solar panels etc). For higher power operation simply add as many Q2/L1 pairs as necessary until the desired capacity is achieved.
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Old 12-05-2008
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Hey, what is this??

I just want the damn thing to go when I turn it on!!
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Quote:
Originally Posted by WouldaShoulda View Post
Hey, what is this??

I just want the damn thing to go when I turn it on!!
And what exactly do you mean...
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Old 12-05-2008
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sailingdog is just really nice sailingdog is just really nice sailingdog is just really nice sailingdog is just really nice sailingdog is just really nice
Just curious, what trimaran do you have???
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Old 12-05-2008
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Oh jeez...

Trimaran love.

Get a room!!
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Quote:
Originally Posted by sailingdog View Post
Just curious, what trimaran do you have???
It´s a Piver Nugget 24 called Fulô





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BITE ME leadmine boy...
Quote:
Originally Posted by WouldaShoulda View Post
Oh jeez...

Trimaran love.

Get a room!!
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New England

You know what the first rule of sailing is? ...Love. You can learn all the math in the 'verse, but you take
a boat to the sea you don't love, she'll shake you off just as sure as the turning of the worlds. Love keeps
her going when she oughta fall down, tells you she's hurting 'fore she keens. Makes her a home.

—Cpt. Mal Reynolds, Serenity (edited)

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In every forum, community, etc... there a black sheep

Who the hell is this "WouldaShoulda" bloke?
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A guy with a slow boat...
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In every forum, community, etc... there a black sheep

Who the hell is this "WouldaShoulda" bloke?
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You know what the first rule of sailing is? ...Love. You can learn all the math in the 'verse, but you take
a boat to the sea you don't love, she'll shake you off just as sure as the turning of the worlds. Love keeps
her going when she oughta fall down, tells you she's hurting 'fore she keens. Makes her a home.

—Cpt. Mal Reynolds, Serenity (edited)

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Quote:
Originally Posted by WouldaShoulda View Post
Oh jeez...

Trimaran love.

Get a room!!
I am certain that Wouldashoulda is only joking with you guys. We must assume it is his attempt at being funny. I am sure that is all it is because he knows my tolerance level for intentionally trying to start arguments (ESPECIALLY OUT OF OFF TOPIC) is zero... especially right now.

We do joke around with SD and other membres. I do it. But I make sure they are people I know first. And they all take it in stride. I do not want to turn the forum outside of Off TOpic into something dry. However, we must all be conscientious of what we say on the internet because you cannot inflect tone. I have already mentioned that I am over worked right now as it is and we are short handed. I cannot imagine anyone not trying to make the extra effort here while we are going through this period (which may be a long period).

Enough said.

- CD
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