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Old 12-22-2018, 06:10 PM   #21
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Tom B; I was going to ask the same things but restrained myself trying to be nice.
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Old 12-22-2018, 07:36 PM   #22
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Simply put, i have one house bank and one starter bank (no dedicated battery for generator). The starter bank starts both engines and the generator. When I start the genset at anchor, the tiny generator alternator tries to charge the large bank and gets really hot. To avoid it, I have had to build a custom battery charger profile to take the burden off the genset alternator. The rub is that the charger is in a very awkward place in the boat and the profile, unbeknownst to me when I bought the charger, cannot be changed with the “remote control” panel. So it will be easier to just bypass the little alternator that I just don’t need until I can get a new charger or find a new place to mount it. So there ya’ go.
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Old 12-22-2018, 07:37 PM   #23
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If you don't have an alternator, then my vote is for a combiner like the aforementioned Blue Sea ACR (Auto Charging Relay) or the Yandina combiner.

I started with a Yandina 100 and upgraded to the 160 later when I upped my alternator. They are set-and-forget if you want that or they can be set up with a small control switch that allows control of the auto/manual functions. I chose the latter and have been very pleased.

It's normally in the auto (set-and-forget) mode but when I desire a manual parallel of the batteries to share a single charge, then I can select that function. I find this helpful with my twins allowing me to charge both battery banks from either single alternator in the event of single engine operation or from my single bank shore charger.

In either case, the banks separate when the charge disappears so the house loads can't drag down the start bank.

I have separate 1-All-2-OFF switches on the load side of the circuits to allow me to tie the banks together for jump start purposes or to share the start battery with the house loads. This has never been needed but I'm glad it's there just in case.
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Old 12-23-2018, 07:29 AM   #24
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Quote:
Originally Posted by Tom.B View Post
Just so I can be told on an online forum how wrong and stupid I am. :-) lol
Ah.




Quote:
Originally Posted by Tom.B View Post
Simply put, i have one house bank and one starter bank (no dedicated battery for generator). The starter bank starts both engines and the generator. When I start the genset at anchor, the tiny generator alternator tries to charge the large bank and gets really hot. To avoid it, I have had to build a custom battery charger profile to take the burden off the genset alternator. The rub is that the charger is in a very awkward place in the boat and the profile, unbeknownst to me when I bought the charger, cannot be changed with the “remote control” panel. So it will be easier to just bypass the little alternator that I just don’t need until I can get a new charger or find a new place to mount it. So there ya’ go.
Might be easier, if you have a small space somewhere, to add a separate genset start battery? Could be some advantages to that?

But I'm surprised your alternator is getting hot, or trying to charge the larger start bank to any serious degree. Wouldn't have thought your engine start battery would take much charging, most of the time... It's not like starting your engine occasionally depletes it all that much...

??

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Old 12-23-2018, 08:11 AM   #25
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I replaced my gen batty On-Off Sw with a 1-2-Both-Off Sw.
Same foot print & mounting.
It allows me to connect gen & start/house batts if needed in an emergency... sort of a permanently available set of jumpers.
That way I can use either batty to help boost a weak one... isolators won't allow that. My AGM gen batty sits all winter in storage w/o a problem and so far I have never had to use the Sw in combine mode.... nice to have the insurance and I liked the simplicity. I do have a 120V outlet next to the gen batty and have a maintainer stored there for topping off the gen batty if unused for a long period.
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Old 12-23-2018, 08:36 AM   #26
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One of the main jobs of the generator on my boat is to power the main battery charger for the house bank. There's also a secondary charger connected to the starting and genset banks. So, whenever the generator is running, all the banks are being charged, alternator or not.

Not to dismiss all the other good ideas posted above, but that's my "set it and forget it" solution.
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Old 12-28-2018, 04:16 PM   #27
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Based on my experience,

kept in mind the following points:

1) The generator may have (in my case has) is own battery-charging alternator.
2) The generator starter battery does not power any appliance. The only items the battery powers besides the starter are the light in the control panel and possibly injector heaters (as in my case), all of which are used only in connection with starting the engine. In newer generators, there may be new electronic panels that draw a minuscule current from the battery.
3) The period of time the generator is producing AC in a typical run should be enough to recharge the generator's starter battery using a small 2-amp-hour AC-powered battery maintainer/charger should be adequate. In my case, the engine alternator takes care of it.
4) An AC-powered charger for the starter battery would also maintain the battery topped while at the slip or from any other AC sourve in the boat.

For the reasons above, in Sea Trek (my boat) I use a small battery (trickle) charger-maintainer. The generator has its own alternator and it does replenishes the battery during operation after starting. The only reason for using a trickle charger in Sea Trek (my boat) is to span long periods without using the generator. The trickle charger is operated either from shore AC power or the inverter, as available.

Cheers,
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Old 12-28-2018, 08:30 PM   #28
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Another way is charging your genset battery via a small dedicated solar panel. A 25W panel with a basic regulator to the 6D/135AH sealed battery has worked well for 5 years. It overcomes the "not running not charging" issue,keeps the genset batt independent, and charged for starting the genset.

This is my way of doing it.
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Old 12-29-2018, 07:09 AM   #29
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'add some charge to the generator start battery while cruising along for several hours. '





1. Is the genset, start & house battery same chemistry, say flooded lead acid [fla] with similar charging voltage requirements ?




If yes then a very simple solution I have used with success is a voltage sensitive relay [vsr]


The ones I have used a "BEP VSR"



Voltage Sensing Relays | bep


sealed and designed for marine ~140amp rated. they have a led that indicates when charging.
They turn on at around 13.2v and off around 12.7 so only once the source battery starts to charge [propulsion engine] it closes. Once source battery off charge [ engine stopped ] they open. so doesn't flatten your source battery.


vsr has two studs & one thin black wire

one stud gets hooked up to source [start] battery positive and the other gets hooked up to your load [genset] battery positive with a thin wire to your negative bus.



I always put a 150A fuse in series too.


If not similar battery chemistry and or different charging requirements between the start, house battery & genset batteries then still use a vsr and a dc to dc adjustable converter




then the battery charging only gets turned on when your propulsion engine is above charging speed, and your system is less likely to flatten the start battery.



if you keep the wire under say 8 gauge max[~4mm]] then the source alternator wont work as hard and it'll reduce the initial charge current a little and so last longer.







Genset alternator overheating


is genset permanent magnet [often two wire with no fan, like a lot of small tractors] or variable field alternator [like a normal car type alternator] ?



if its permanent magnet you cant overdrive it [they actually work flat out the whole time], if its variable field yes you can over drive it.


some dc to dc devices do have a current limit option [victron energy dc to dc do and I've used them]



sing out with questions.


happy new year all and may your fishing rods have a good bend in them


Kind Regards Donald
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