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  #11  
Old 05-08-2010, 09:02 AM
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I am using the Lifeline Group 27 batteries in my dual battery setup. Best deal to be had on them over the years is from DC Batteries (sales@dcbattery.com). They're out of Florida, and have great pricing and shipping is very reasonable (AGM's are NOT hazmat, so they ship normal UPS).

Lifelines are the gold-standard in marine batteries. My Group 27's are rated at 100AH, and just under 190 reserve capacity.

I did a custom dual-battery install -- specifically because of my winch. I've got a constant-duty 600A solenoid, switched by the charge circuit. I've got 1/0 cable between the batteries, and hi-amperage fuses. One of my design criteria was to run the winch off both batteries & the alternator when the engine is running, and the aux battery alone when it isn't.

If you're happy running the winch off of the main battery, you *may* be able to use the National Luna kit as-is. IIRC, it is voltage switched, and when the winch starts drawing more than the alternator puts out, the voltage will drop and the NL solenoid will open.

I dig the NL battery monitors -- not expensive and a great health/charge indicator.
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Old 05-08-2010, 09:21 AM
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I've got the NL system on my Tacoma with dual batteries and a winch. I upgraded my cable to 1 or 2 awg, and I eliminated the 100A fuse (I'd have to recheck the system to recall exactly what I did). Since you won the kit, it's not really a waste to upgrade the wiring and do what you want to do. Plus, since you are talking about getting a nice starting battery, you can just wire the winch directly to that one (I'd recommend the DH Platinum), and then use your blue top for accessories.
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Old 05-08-2010, 04:41 PM
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Still not sure what my plan will be. I really like Marco's set up but if I go that route non of my winnings will be useful. I'll probably just upgrade the solenoid and cable to use what I got.

Either way it will be a while before the Cruiser account has money to complete the install.
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Old 05-08-2010, 05:19 PM
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Quote:
Originally Posted by Corbet View Post
Still not sure what my plan will be. I really like Marco's set up but if I go that route non of my winnings will be useful. I'll probably just upgrade the solenoid and cable to use what I got.

Either way it will be a while before the Cruiser account has money to complete the install.
I don't think you'll need to upgrade the solenoid with the national luna setup, just the cable.
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Old 05-08-2010, 11:05 PM
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solenoid is rated for 85 amps. Not much when winching. But hard to say how much the winch would draw from the 2nd battery at any given time.
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  #16  
Old 05-10-2010, 06:37 AM
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Quote:
Originally Posted by Corbet View Post
solenoid is rated for 85 amps. Not much when winching. But hard to say how much the winch would draw from the 2nd battery at any given time.
My guess is that it would be fine, assuming you wire the winch to the PRIMARY battery.

Reason is that the winch draws more than your alternator will put out. Consequently, as soon as the winch powers up, the draw will cause the system voltage to drop to below the 13.x volts that the NL circuitry uses to detect "system charge".

It's probably worth a call to Paul @ Equipt to ask him his recommendations...
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Old 05-10-2010, 11:25 AM
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To quote superjuice, "Before i bought the hellroaring unit i questioned the amperage rating as being low for winching (300 amps). Their response for an auxiliary battery setup was this: if you are winching off of your main battery then the isolator is not being used....If you are winching with the batteries combined (most likely scenario) then both batteries would share roughly the same amount of amperage. So if your pulling 500 amps then each battery would only have to accommodate 250 amps each, or depending on which battery it is connected to and the state of charge the "other" battery would make up the difference. This makes sense to me and i figure they are a bright bunch of guys to boot, HTH"

Sounds reasonable to me. I added to this in my own head, what happens in the worst case scenario. Such as winching when the engine dies or cannot run. If the truck is laying on it's roof, I wouldn't run the engine. In that case, the winch is capable of pulling 490amps (9000) and would be sharing half that through the isolator. Add to that a battery that is bigger in the aux position and it might go higher. So lets throw out a number like 300 and you are pushing that little solenoid to it's limit. I agree this will probably never happen but we build these things to handle all trouble we can put them in.
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  #18  
Old 05-10-2010, 11:47 AM
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Mike, I'm pretty sure the NL is voltage sensing, and Opens at something like 13.2 volts. If this is indeed true, as soon as he starts winching, the solenoid will open, and *no* charge will be flowing through (winch will only be drawing from primary and alternator).

For reference, running my winch at no-load immediately drops my system voltage to 12.x volts. A significant load drops it to 11.x volts. My winch runs off of both batteries and I set my hand throttle to 2000-2500 rpm during winching, so my voltages are likely higher than typical.

Note: Just checked, it closes at 13.2 volts, and cuts out at 12.7. The surge rating for the solenoid is 400A.
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