Tohatsu M30H, rectifier and alternator

[Mick kaco]

Would anyone know if it is possible to increase the amp output of a alternator from a tohatsu 30HP (M30H)?

Also I need to instal a rectifier to charge my battery. Although I'm aware that the standard rectifier only puts out 5 to 6 amps. I would like to charge out more amps and would like to have a regulator to control the charge.

I was wondering if I could use the "regulator/rectifier 3AC-76067-0" which is off the 30hp four stroke (MFS30), I believe this regulator/rectifier can handle a much larger charge, at 15amps.

Could I instal the"regulator/rectifier 3AC-76067-0" which is off the 30hp four stroke (MFS30) on my 30hp tohatsu tow stroke (M30H)?

I know this may void the warranty, but with the warranty issues aside, the wiring input and out put seam the same.

 

[pvanv]

Re: Tohatsu M30H, rectifier and alternator

Any bridge rectifier (even a home-made one, assembled with 4 diodes) will work (electrically -- though the wiring connectors may differ), but the issue here is that your alternator only makes just so many amps. The newer, more expensive rectifiers are also regulated, because the newer alternators have such a high output that they need to be throttled back as the battery comes up to full charge, or else the battery electrolyte would off-gas ("boil"). So, yes, you can install a newer rectifier, or even a rectifier/regulator. But it's like putting a huge, say 6-inch shutoff valve in your water line at home, instead of the 3/4" valve that most homes have: You still only get the flow that the water system has available.

 

[Mick kaco]

Re: Tohatsu M30H, rectifier and alternator

Any bridge rectifier (even a home-made one, assembled with 4 diodes) will work (electrically -- though the wiring connectors may differ), but the issue here is that your alternator only makes just so many amps. The newer, more expensive rectifiers are also regulated, because the newer alternators have such a high output that they need to be throttled back as the battery comes up to full charge, or else the battery electrolyte would off-gas ("boil"). So, yes, you can install a newer rectifier, or even a rectifier/regulator. But it's like putting a huge, say 6-inch shutoff valve in your water line at home, instead of the 3/4" valve that most homes have: You still only get the flow that the water system has available.

Thank you for your help. I totally get what you mean by the "overkill" shut off switch! Great, I think I'm on the right track!

I do have another issue though. I need to boost the output of my alternator amps from the standard 5 to 6 amps. I'v chosen the "rectifier/regulator 3AC-76067-0" (from the four stroke Tohatsu), this will acomadate a larger amp output.

How can I boost the alternator amp output?

Could I have my existing alternator rewired to a larger wattage, or could I usea larger alternator/s?

I noticed Tohatsue do a larger capasity alternator. Would I be able to use any of the 80W alternators listed below?

Description from link below. Alternator models as follows;

http://www.tohatsu.com/accessories/repair_kits.ht

*
Genuine Tohatsu Repair Kits


Alternator Kit
These Alternator Kits are used to provide 12V power for manual start models. Supplies AC current which requires either a regulator for lighting or charging rectifier kit for DC battery charging. Kit includes an alternator, screws and clamp for mounting under flywheel assembly.
Note: picture may not be of original


Description

Applicable Models

*3H6-06128-0

Alternator Kit (12V 60W)

M5B (2-Stroke) & MFS4/5/6A & A2 (4-Stroke)

*3AS-06128-0 Alternator Kit (12V 60W) MFS4/5/6B* (4-Stroke)
*3B2-06123-1 Alternator Kit (12V 80W) M8/9.8B (2-Stroke)
*3V1-06128-0 Alternator Kit (12V 80W) MFS8/9.8A (4-Stroke)
*3V2-06128-0

Alternator Kit (12V 80W)

MFS8/9.8A & A2 & A3 (4-Stroke)

* * * * * * * * * * * * * * * * **Alternator kit for MFS4/5/6B (4-Stroke) models includes flywheel

 

[pvanv]

Re: Tohatsu M30H, rectifier and alternator

Don't do it.

It's possible to "frankenstein" almost anything. But, keep in mind a couple of things:

1. 80 watts is 6 amps (at battery voltage), so you already have that output, and would gain nothing from the other alternators.
2. Any alternator's output is a function of the flux of the magnet(s) passing the coil(s). Your flywheel only has just so much magnetic flux, and can only generate just so much electricity. Yes, a re-wound alternator could possibly get you a teensy bit more, but nothing significant.

If you don't have any other way to generate electricity (such as a dedicated generator),
and if you don't need the recoil starter,
and if you aren't concerned about hacking up your motor,
and if the top of the motor is mounted so that it stays dry,
and if you have a fabricator who is willing to build the brackets...

You could theoretically fabricate a system that mounts a conventional marine alternator (such as a Balmar unit) on top of the powerhead, driven by the 3 flywheel puller bolt holes. Ridiculously expensive, not to mention unsightly, heavy, huge, tremendous consumption of horsepower... the list goes on and on.

My recommendation is to find another method to make your power. Options include solar, wind, and gas or diesel generators.

 

[Mick kaco]

Re: Tohatsu M30H, rectifier and alternator

Don't do it.

It's possible to "frankenstein" almost anything. But, keep in mind a couple of things:

1. 80 watts is 6 amps (at battery voltage), so you already have that output, and would gain nothing from the other alternators.
2. Any alternator's output is a function of the flux of the magnet(s) passing the coil(s). Your flywheel only has just so much magnetic flux, and can only generate just so much electricity. Yes, a re-wound alternator could possibly get you a teensy bit more, but nothing significant.

If you don't have any other way to generate electricity (such as a dedicated generator),
and if you don't need the recoil starter,
and if you aren't concerned about hacking up your motor,
and if the top of the motor is mounted so that it stays dry,
and if you have a fabricator who is willing to build the brackets...



You could theoretically fabricate a system that mounts a conventional marine alternator (such as a Balmar unit) on top of the powerhead, driven by the 3 flywheel puller bolt holes. Ridiculously expensive, not to mention unsightly, heavy, huge, tremendous consumption of horsepower... the list goes on and on.

My recommendation is to find another method to make your power. Options include solar, wind, and gas or diesel generators.

Thanks for your help. I can see what you mean, by the hassle and expense.

The rectifier\regulator I have as mentioned earlier I'm choosing to instal. Although I'm not to clear of the wiring to my existing motor.

Is anyone know the wiring diagram for this rectifier? Please see pic attached.


/Users/apple/Desktop/photo.JPG

 

[Mick kaco]

Re: Tohatsu M30H, rectifier and alternator

View attachment 180232

Don't do it.

It's possible to "frankenstein" almost anything. But, keep in mind a couple of things:

1. 80 watts is 6 amps (at battery voltage), so you already have that output, and would gain nothing from the other alternators.
2. Any alternator's output is a function of the flux of the magnet(s) passing the coil(s). Your flywheel only has just so much magnetic flux, and can only generate just so much electricity. Yes, a re-wound alternator could possibly get you a teensy bit more, but nothing significant.

If you don't have any other way to generate electricity (such as a dedicated generator),
and if you don't need the recoil starter,
and if you aren't concerned about hacking up your motor,
and if the top of the motor is mounted so that it stays dry,
and if you have a fabricator who is willing to build the brackets...



You could theoretically fabricate a system that mounts a conventional marine alternator (such as a Balmar unit) on top of the powerhead, driven by the 3 flywheel puller bolt holes. Ridiculously expensive, not to mention unsightly, heavy, huge, tremendous consumption of horsepower... the list goes on and on.

My recommendation is to find another method to make your power. Options include solar, wind, and gas or diesel generators.

Thanks for your help. I can see what you mean, by the hassle and expense.

The rectifier\regulator I have as mentioned earlier I'm choosing to instal. Although I'm not to clear of the wiring to my existing motor.

Is anyone know the wiring diagram for this rectifier? Please see pic attached>

 

[Mick kaco]

Re: Tohatsu M30H, rectifier and alternator

See attached photo.

 

[pvanv]

Re: Tohatsu M30H, rectifier and alternator

Photo isn't working. You have a single-phase AC input, and then a single DC output. Standard bridge rectifier. What is the PN of the rectifier you want to use, and why would you not just use the Factory stock rectifier, as long as it tests good?

 

[Mick kaco]

Re: Tohatsu M30H, rectifier and alternator

The photo below is the rectifier/regulator that I purchased (MFS30 four stroke). I'm using this rectifier because it has a regulator all in one unit.

This rectifier is from the "MFS30 four stroke" and I want to instal it onto my "M30H", although I'm not too sure about the wiring.

Do you know the wiring diagram for this rectifier? Alternatively;

The wiring setup for each of the wires?

Keeping in mind I need to cut and join each wire onto my "M30H" two stroke (see photo no: 2 below) which has the same wiring inputs and outputs, but they are color coded differently.

 

[TOHATSU GURU]

Re: Tohatsu M30H, rectifier and alternator

You know you don't need a regulator as the battery will act to prevent spikes because your amps are so low and even at WOT you cannot hurt the battery.

 

[Mick kaco]

Re: Tohatsu M30H, rectifier and alternator

You know you don't need a regulator as the battery will act to prevent spikes because your amps are so low and even at WOT you cannot hurt the battery.

Thanks guys for your input,

I'll give you the big picture of what I'm tring to achieve.

I have a small tini (roof topper) that I'm kitting out for adventlures/fishing and island hopping over several days and even weeks on board the tini.

One system is the electrical supply which I'm setting up a 12v supply (54 amh), which I need to run;

- GPS
- Depth sounder
- VHF radios
- Small fridge
- electric motor (54 pound thrust)
- Battery charger for small devices (AA, AAA, camera batteries)

I need to charge the power supply by using two options;

1. Solar power, three small solar pannels, total of 64W

2. As much power I could obtain from the running motor / alternator

I want to incorporate two small solar pannels onto the outboard motor (M30h)

The reason I'm using the regulator is so it will controll the voltage from the "alternator" as well as the two "solar pannels which total 14W". Keeping in mind everything needs to be maximum output (voltage), with minimum size and weight.

The rectifier/regulator I have chose, as in the pic above, is a small all-in-one unit, I hope to wire this to my "Tohatsu M30H".

I have come a long way and I'm greatful for any sure input that will help me solve these issues.

I will upload more pics as we progress to the completion of the "Hybrid 12v power supply from a 'Tohatsu M30H'".

Does anyone know the wiring set up of this rectifier? Or how I could check the wiring so to fit the rectifier to the existing wiring on my "Tohatsu M30H"?

 

[pvanv]

Re: Tohatsu M30H, rectifier and alternator

1. As Elvin noted, you do not need regulation from the outboard, because the alternator is so small.
2. The rectifier/regulator you propose is for a 3-phase alternator. Your motor has a single-phase alternator. They are not designed to work together.
3. The amp draw of the refrigeration alone will exceed both your battery reserve and the output of the outboard (even if you run it 24-hrs-a-day), and will consume every drop (and then some) of solar you are considering, leaving nothing for the rest of the loads.

In short, your house bank is woefully too small. Your charging system is way too small. Your loads are much too big. If you compute your average amp-hours per day, that will tell you how big your battery should be, and also how much charging you need. The system you propose is just too puny to make it work, period. Get a small portable generator, and you will do better.

 

[TOHATSU GURU]

Re: Tohatsu M30H, rectifier and alternator

I would rethink the current(pun intended) plan.You never want to use your engines electrical system for anything other than a minor amp drain, like boat lights and or VHF. So I would use the engine for that and rig up a seperate grid using solar and a wind vane for everything else.

 

[pvanv]

Re: Tohatsu M30H, rectifier and alternator

Yep. You need more charging than the 30 will produce.