I have a rzr s and I just upgraded to the 30 amp hour that fits the xp. My factory was 15 amp hour. I'm happy so far,

 

Isolated dual batteries hands down.

 

X2 One for the winch. Don't want to winch out of a mud hole and have a dead primary battery. Ride safe,

Roy

 

by why Isolate them if not running radios or lights while off....wouldn't in Parallel work just fine

 

The problem with running parallel is, if you kill one, you just killed the other. Never a good idea to run parallel, because now you never have a back-up.

Cheers

 

Parallel batteries will discharge at the same time, and you could wind up with two dead batteries. Isolated batteries, with one for the winch (or lights or whatever accessories you have) will not discharge your main battery, allowing you to always b able to start your rig even if your second battery is dead. As for charging, when the main battery is at a certain voltage, the second battery will then charge. Ride safe,

Roy

 

Look up DEKA batteries. I run the 440 CCA model and I run 4 speaker stereo, 4000lb winch and 20 inch lightbar. Never had a dead battery with it. It just fits where the stock battery goes with no room to spare but none the less it fits.


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but if you run a idolater you dont get the amps of running parallel so if your looking for power get the oddesy or run 2 batterys in parallel

 

and i have never let mine run low enough to worrie about being dead

 

You can get isolators that will tie the 2 batteries together for extra power. Have to use a momentary toggle switch. Motor homes use them. Can get as cheap as 20$. It looks the same as a old ford starter solenoid.

 

Yoe are probably over thinking this. If the stock battery served you well replace it with another one or buy the 925l or the Deka. I have run both in Arizona with no issues.

 

Only thing running on the cranking battery is the rzr, everything else is hooked to my auxiliary battery, an Odysey 925L, which is isolated but also charged while running via a voltage sensitive relay which is built into my four way battery switch (BEP 714 compact).

Great system, great piece of mind when miles up the trail.

 

Some guys, especially the new-to-the-sport ones, just need to learn the hard way, what happens when you're way-the-hell out in the middle of nowhere and you can't get your RZR started because your battery is dead! And, if you're by yourself, you're f@#k'd.......hope you brought something to eat and a lot of water, cuz you're gonna be there awhile!

Cheers

 

Here's my write-up on Dual Battery set-up:

http://www.rzrforums.net/lighting-stereo-electrical/73534-dual-battery-installation.html

 

At what point do you need more than a stock battery. I just bought a xp4 and will be putting a 30 inch light bar and 2 rigid D2's and a single spot light to cover the back. I also plan on putting a winch in . I could see me running the factory, bar and 2 cube lights at the same time. Can the stock battery handle it? On my Rhino I run HID's and 2 cubes with no problem and also have a winch, but I have never had to run the winch without the rhino running, which probably helps

 

For me, it was after the second time I needed a jump start at Comp Hill (from listening to music too long). As far as just using a light bar (and other miscellaneous lights), probably not a soon. Dual battery with a voltage controlled battery isolator ensures you never kill your main battery (cause getting stuck in the sticks and not being able to start your RZR just sucks).

 

I've had the xp 900 from the get go with a radio that I never turn off, and 2 ea. 4 LED light facing forward and 1 ea. 4 LED light facing backwards on the polaris lock n ride light bar. Never had an issue ever even when we sit around the fire ring most the night with everything going and the rzr always starts. We do carry mini jumper cables we bought at our dealer.

 

The most important thing is to use less amps than the stator puts out. On a 800-S thats 500 watts or 40 amps. Half that goes to run the engine. So you have 20 amps to play with. 1 amp for the lighted whip. 5 amps for the headlights. 1 amp for the tail lights up to 5 amps for brake lights. That leaves you 13 amps for the light bar and stereo. Anymore than that you are discharging the battery. So how long can you go? If you are 2 amps over and have a 15 amp hr battery that is about 3hrs. Huh? Well, batteries are only efficient to 50% of discharge. Having more amp hrs i.e. a second battery will give more time but dead batteries are still coming. You need a way to put charge back in them overnight.

Batteries do not like to be deeply discharged. Starting batteries especially. Run a starting battery dead it may stay dead. Deep cycle work ok to 50% discharge. So for best battery life run them in parallel so each battery gets less deeply discharged.

 

Running dual. Stock and Odyssey 925 with a dfna isolator. Happy with set up

 

I run dual batts in a parallel...never had an issue. I've got a 30" rigid light bar, 4 duallys, stock hids, winch, 4 speakers & sub.

I'm very conscience of letting my stereo run when my rzr is not. Doesn't take much to drain it...

 

I run optima yellow top batteries. I had one in my '09 when the factory crapped out. I could run my radio for 6 hours and still crank fine. I now have an xp 4 and put one in it on the drivers side on the trailing are mount. easy to mount with plenty of room. I can run a 13 inch light bar and my radio for 3 hours in the woods and crank right up to drive off. If you watch advance auto i can usually find coupon codes to buy online and pick up in the store for about the same as a stock battery or the odessy battery. I like the extra reserve capacity.

 

I run two in parrallel. The Pro X2 batteries that Sam sells with Dunertunes work great. I never isolated them. Ran a 4 speaker 300W amp stereo, light bar, back up lights, winch, effects lighting with no issues. I also had the 12 XP 900 with the larger stator. That helped recharge easily on shorter runs. The newer rigs have a smaller stator and I think it takes longer for them to recharge. I am going this route again on a new RZR S.

 

I just added a second one for my stereo and winch... I have yet to wire in the isolator though. Waiting on parts.

 

With the engine at idle, how long can you winch before draining our battery dead? How can you tell you're in the 'danger zone'?

 

I think if your idling you would be fine for the time it takes to spool 50 feet of cable. My bigger concern is with the stereo playing during lunch/breaks and then not being able to start.

I do know that if your not running and using the winch, it will drain the battery to the point where you cant start... been there, done that!

And then there's night riding and winching... a whole other story!

 

Greg C ran the heck out of his on his Commander for about 4hrs one day at idle and the battery held up. There were frequent stops for adjusting straps and maybe the Commander has a better charging system and it was a hard pull.

 

^^^ I suppose, lights, more lights, then the winch.
I won't have a sound system, but probably a set of lights. I have never had, or even used an electric winch before, just my old trusty 2000 lb single line come-a-long, so I'm clueless to battery needs. I highly doubt I'll be using it often, as I'm not into mudding, but I'd like to have a winch just in case.

 

dual