1989 Hunter 40 - A million questions. - Page 18 - SailNet Community
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post #171 of 813 Old 04-22-2014
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Re: 1989 Hunter 40 - A million questions.

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The place I've chartered now keeps one of these on every boat. It seems like cheap insurance in case some nitwit like me forgets to charge the battery and leaves the fridge on for three days.

I don't think charter companies trying to "out think" nitwits is a good example.

I think a separate start makes sense, but a jumper kit seems crazy. Do you take that home after each sail to charge it and then bring it back each time?

BTW - if I'm 300 miles out, in trouble, waited till my batteries are dead, then wanted to start the engine; its time to rethink things.


BBTW - it doesn't bother me if people want to have one of those jumper thingies on THEIR boat, no matter how crazy it seems to me.

Don't blow air up my rear, be useful and blow it at the sails!
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Re: 1989 Hunter 40 - A million questions.

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I don't think charter companies trying to "out think" nitwits is a good example.

I think a separate start makes sense, but a jumper kit seems crazy. Do you take that home after each sail to charge it and then bring it back each time?

BTW - if I'm 300 miles out, in trouble, waited till my batteries are dead, then wanted to start the engine; its time to rethink things.
I keep it on the boat and check/charge it when I'm there. If you want to carry a spare, separate battery for a separate start go for it. I don't. This thing gives me many more options.

As for re-thinking things, I guess you're right. Of course, strange things happen out there - usually ones you never would have thought of. Crazy is thinking you've always got it all under control then not having spares when you need them.

Last edited by smackdaddy; 04-22-2014 at 04:22 PM.
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post #173 of 813 Old 04-22-2014
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Re: 1989 Hunter 40 - A million questions.

In the end it looks to be about 2 6-packs of space. One must have priorities!
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post #174 of 813 Old 04-22-2014
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Re: 1989 Hunter 40 - A million questions.

Smack, can you clarify a couple of things? You have two 8D batteries in two banks and you carry that jump starter battery when the two banks totally discharge? Can you tell me why you don’t want a dedicated start battery again? I’m assuming that you are running the stock “Motorola” alternator?

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post #175 of 813 Old 04-22-2014
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Re: 1989 Hunter 40 - A million questions.

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I keep it on the boat and check/charge it when I'm there. If you want to carry a spare, separate battery for a separate start go for it. I don't. This thing gives me many more options.
I didn't realize this was the case! If it's true I URGE YOU to do a quick dockside test to make sure that jump thingy will start your engine. Just disconnect or isolate out your batteries and connect the jump thingy only and see if you can start your engine with it. Preferably on as cold of a day as you may expect to start it. If you can, your plan is a good one. If you can't (which I strongly suspect) then you are carrying around a false sense of security.

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post #176 of 813 Old 04-22-2014 Thread Starter
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Re: 1989 Hunter 40 - A million questions.

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Smack, can you clarify a couple of things? You have two 8D batteries in two banks and you carry that jump starter battery when the two banks totally discharge? Can you tell me why you don’t want a dedicated start battery again? I’m assuming that you are running the stock “Motorola” alternator?
I have TWO Interstate SRM-27 batteries for house power that are wired into the Blue Sea switch (1/2/Both/Off).

Then I have ONE Interstate 29DC battery for starting that is independent of the house bank and Blue Sea switch. It is a dedicated start battery.

All of these are chargeable via the alternator and the charging relay thingy I'm not yet familiar with.

There is another switch that will combine the house batteries with the starter battery if needed.

The jumper thingy is for helping the starter battery crank in an emergency (I'd likely try this before combining house and starter batteries).

Med - I'll do a test with the jumper thingy only to see if it will start the engine by itself.

(I'll get pics and videos next time I'm on the boat.)

Last edited by smackdaddy; 04-22-2014 at 08:50 PM.
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post #177 of 813 Old 04-22-2014
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Re: 1989 Hunter 40 - A million questions.

Smack, you have an "interesting" set-up. A pair of group 27's for the house? I am not familiar with a group 29 battery. What is the HP and no of cylinders of your engine? The group 24 I have is over-kill for my 35HP Universal starting battery. With such a small house bank, I am guesing you have a 40 Amp alternator. You will want to go through your electical system and do an "as is" drawing. What type of electrical acumen do you have? I suspect that you have a major electrical upgrade ahead of you. Do an energy budget. You might not have enough amps in your system for an overnight passage without over taxing you system. I'll try to dig up my drawing and show you what is going on in my boat.
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Re: 1989 Hunter 40 - A million questions.

Electrical acumen? Me? Heh-heh.

This is the way the boat came out of the box. So, I'm working through everything now trying to figure out what's what. I can do the basics of electrical work - but I don't know anything about the design or mathematics of a system. So your advice, drawings, and help is welcome. Just judging by the above responses, it's a world with a lot of different opinions.

The PO was apparently an electrically accumened dude who added the charging relay, and what he assured me is a 200a alternator, and the Xantrex.

To your specific questions:

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What is the HP and no of cylinders of your engine? The group 24 I have is over-kill for my 35HP Universal starting battery.
Yanmar 4JHE (4-cyl, 40-horse)

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With such a small house bank, I am guesing you have a 40 Amp alternator.
Again - Previous Dude says 200a GM alternator that he put in himself.

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I suspect that you have a major electrical upgrade ahead of you. Do an energy budget. You might not have enough amps in your system for an overnight passage without over taxing you system. I'll try to dig up my drawing and show you what is going on in my boat.
Major upgrade for the system or the batteries? I've already converted all fixtures to LED (except nav lights). But I am concerned about the draw of the radar, etc. Like you, my main concern is that the house power is solid.
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Re: 1989 Hunter 40 - A million questions.

A 200 Amp alternator is going to be some beast. Is that what the surveyor wrote in his report? It would have at least double or perhaps a serpentine belt. I’ve never seen alternators bigger than 140A in a sailboat. One of the problems with an alternator so big is you are robbing close to a quarter of your engine’s output before you even put it in gear. Are you sure you have Group 27’s in your house bank? They can only accept 90 Amps each so the alternator of that size would fry them on a regular basis. Double check this. I have an externally regulated 120A alternator tied to a 360A house bank – and that is way overkill. I want to go down to a 90A alternator to improve my fuel consumption.

Xantrex? Is this an external regulator, monitor, charger, or what?

I did a couple of quick back of the envelope calculations to come up with about 150 Amp hours of consumption per 24 hours. Your biggest energy “hogs” are the reefer, chart plotter and auto helm. With only 90 Amps to play with (1/2 discharge of total house bank). You would have to be running your engine several times a day for several hours if you wanted to do your Harvest 300 race.

Do you have a separate switch to turn on the start battery? I suspect that your start is wired to one of the posts of your selector switch and the house to the other. Do you have an echo charger or a battery combiner? Start tracing your wiring and draw a diagram. And get a label maker (like Maine Sail’s) We’ll make a marine electrician out of you yet! (actually one of the skills you should master before you start cruising)

George B
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Alameda, Ca.

Last edited by GeorgeB; 04-22-2014 at 09:15 PM.
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post #180 of 813 Old 04-22-2014
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Re: 1989 Hunter 40 - A million questions.

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Originally Posted by smackdaddy View Post
Electrical acumen? Me? Heh-heh.
...

Just judging by the above responses, it's a world with a lot of different opinions.
Well, yes and no. I only have one opinion to give, but I think I've given you at least two, probably three, so far based on what I "thought" you had on your boat.

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I keep it on the boat and check/charge it when I'm there. If you want to carry a spare, separate battery for a separate start go for it. I don't. This thing gives me many more options.
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Then I have ONE Interstate 29DC battery for starting that is independent of the house bank and Blue Sea switch. It is a dedicated start battery.
Don't worry, we'll get you figured out. For now, I highly suggest the following book. To my mind it is hands down the best intro to intermediate boat wiring book out there. It's also the only one that I know of that really spends a lot of time on helping the reader really understand the concepts behind all the wiring and calculations.



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