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Caribou Sandstorm
09-30-2012, 09:38 AM
I am thinking of moving ahead on adding a dual battery set up.

Normally I go out on trips with others but I am considering more solo trips in the near future and would like the added security of a back up battery and running all my stuff on a separate battery.

I would like to keep it simple and low cost and then phase in the extra stuff later. I also wanted to first use my existing battery for the back up battery, reason (cost). Edit..looks like I need to use the diehard Marine for fit size to Christo's battery mount.

I am going to get a Die Hard Platinum for the cranking battery and eventually a die hard marine battery for the second battery.

Other than the mounting brackets, what else do I need for the most basic and low cost set up available?

Crash
09-30-2012, 10:17 AM
http://www.bepmarine.com/home-mainmenu-8/product-659/720-mdvs-high-current-remote-operated-vss-500-amps Controlling two Odyssey 1700s is a piece of cake for this switcher. Waggoner uses the http://www.bepmarine.com/home-mainmenu-8/product-350/701-mdvs-high-current-remote-operated-vss-275-amps and I think it is working well for him. About as simple and complete as you can find. The Group 31 1700s will fit Christo's battery tray without problem.

wesintl
09-30-2012, 10:59 AM
I have this and made my own cables. I need to hook it up in the hundy.

http://www.powerstream.com/battery-isolator.htm

simple and inexpensive. no need to NL and others.

Caribou Sandstorm
10-01-2012, 01:09 AM
Cool thanks guys!

rover67
10-01-2012, 10:03 AM
throw a battery in the trunk for emergency starting needs if you want the simple solution.

I use a BEP marine switch in the 60 and it works well. I think it is rated at 300 amps. I have winched with it a lot and pretty much never thought about it after installing it.

I think the write up is here somewhere.

Crash
10-01-2012, 10:18 AM
throw a battery in the trunk for emergency starting needs if you want the simple solution.

I use a BEP marine switch in the 60 and it works well. I think it is rated at 300 amps. I have winched with it a lot and pretty much never thought about it after installing it.

I think the write up is here somewhere.

Marco's writeup helped me get the job done. The BEP switch he uses has been superseded by the one I have.

Caribou Sandstorm
10-01-2012, 10:39 AM
How much are these BEP switches? Do I order direct? edit figured it out.

rover67
10-01-2012, 11:20 AM
cool man, let me know if you need some help. gimme a buzz any time.

Caribou Sandstorm
10-15-2012, 10:38 AM
Update, I picked up a Sears Platinum Marine 34 on Sat. 219.00

The 31s were an option I was considering but that is a mammoth sized battery, so I went with a 34.

Hoping to install the 34 today.

Jacket
10-15-2012, 11:21 AM
That's what I've been using for the last 5 years as my second battery. It's held up well and only just recently seems to be weakening a bit (in the sense that it doesn't seem to hold a charge as long when I'm parked for several days). Mine needed a booster to make it tall enough to use the stock trays - I think it's a piece of 3/4" plywood.

Caribou Sandstorm
10-24-2012, 04:36 PM
Here is what I did.. No doubt you have seen the 31M here from other pics on mud, but the spacer I fabbed up and the bracket fit might be another good example. Next is to get Christo's kit to wire it all up. Maybe a Christmas present from Ol' St. Nick

Special thanks to my Lifelines out there that I contacted along the way..You know you who are...:D

http://chrissandstormfj.smugmug.com/Other/Canyonlands-Needles-District/i-Nx7R87v/0/L/IMG1287-L.jpg

http://chrissandstormfj.smugmug.com/Other/Canyonlands-Needles-District/i-RRzhZgp/0/L/IMG1288-L.jpg

http://chrissandstormfj.smugmug.com/Other/Canyonlands-Needles-District/i-5KkdHf9/0/L/IMG1290-L.jpg

Caribou Sandstorm
04-24-2013, 10:47 AM
So I finally got my second battery wired. With zippo extra time, I dropped my truck off at Cart Toys on Broadway. 85.00 labor and 70 for cables. Probably a little high priced on the cable but handing someone the keys and going to work at Starbucks ;), has many advantages over saving a few bucks...

Currently (pun intended) I still have all accessories mounted to my starter 31 DieHard.. Nothing is connected to back up 34 Diehard, except The solenoid and smart chip are connected and secondary ground on back up battery, as well.

The guy at Car toys said so if you leave your radio on, you will still drain your back up battery.. And that got me thinking about the set up.. Called one of my my electrical life lines and we talked about it.. Still not 100% percent. Called the manufacture of the Solenoid and chip and he suggested more items on the back up battery vs the starter..

But I wonder if that is in a traditional model where you have not installed a marine battery for your starter, as well?

My goal, is to always have a charged back up battery and really never use it unless my main is dead. So in this model, I am thinking only thing I need to do is buy the switch that allows the current to draw from the back up battery back to the starter? Essentially a manual override to what the chip is providing.

Anyway, I know this is simple stuff to many but I am not so well versed and trying to get my arms around the best design for what I want... A battery that is always ready if I am by myself in the desert and for some reason I have killed my main..

Thoughts?

DaveInDenver
04-24-2013, 11:14 AM
Did you use one of those BEP switches to control the battery isolation? Not sure what the Car Toys guy is talking about if you've got your radio still hooked to the starting battery.

It doesn't matter what type of battery you used, capacity is capacity. The difference is in load type tolerance. Marine batteries don't mind long duration, small loads while starting batteries hate them. OTOH, true deep cycle batteries won't last long starting engines. That is due to the differences in construction methods. There are some difference in how deep you can discharge repeatably the various types. But regardless 100 A-hr is 100 A-hr.

If you want a true wired back-up, a battery switch is the easiest solution to that. For that matter, you can mount the battery, use a passive isolator to piggy back to the charging system, essentially trickle charging the back-up when you're driving, and carry a pair of jumper cables to save yourself. The reverse resistance of a diode is very high so it's for all intents and purposes separate from the truck, it's only consumes much current and supplies next to zero.

It's when guys want automatic and smart controllers where the complexity increases. If you have a manual switch that disconnects the second battery and you have nothing hooked to it the only mechanism is self discharge, which is true of all lead-acid batteries. Left long enough the internal resistance of the batteries itself is a very small load that discharges the cells.

Caribou Sandstorm
04-24-2013, 11:24 AM
I have the one from Powerstream from Wes' link, in the first page

I think all I need from doing a bit more research this morning, is a manual switch to over ride the smart chip or as you mentioned jumper cables.

Jacket
04-24-2013, 11:30 AM
My basic approach is to keep the starting battery for all the OEM stuff, and the auxiliary battery for all the add-ons (2M, Fridge, Inverter, Karaoke machine, and all auxillary 12v and 110v outlets). But I guess if you want to play music continuously at camp, then you'll need to keep an eye on that starting battery, or get a little portable unit and plug your Ipod into it (assuming you have an inverter).

I've always had my winch wired to my primary battery, I think mostly because of the direct relationship to the alternator for extra power if needed.

Caribou Sandstorm
04-24-2013, 11:50 AM
My basic approach is to keep the starting battery for all the OEM stuff, and the auxiliary battery for all the add-ons (2M, Fridge, Inverter, Karaoke machine, and all auxillary 12v and 110v outlets). But I guess if you want to play music continuously at camp, then you'll need to keep an eye on that starting battery, or get a little portable unit and plug your Ipod into it (assuming you have an inverter).

I've always had my winch wired to my primary battery, I think mostly because of the direct relationship to the alternator for extra power if needed.

That helps, thanks.. I have my winch wired to the main also, mostly because I never had a back up.

I think 100s come with inverters, I have one in the center console, I think..

Jacket
04-24-2013, 12:05 PM
If it's a stock inverter, then it will be using the primary battery.

But you have a group 31 as your primary, you shouldn't have to worry too much about playing some music....

nakman
04-24-2013, 03:16 PM
That helps, thanks.. I have my winch wired to the main also, mostly because I never had a back up.

I think 100s come with inverters, I have one in the center console, I think..

Nope. They come with 110watt 12v plugs, but not 110v outlets. That seems to be a common misconception, not sure why they even bothered to label those plugs that way. It's just another cig lighter though. :o

Caribou Sandstorm
04-24-2013, 03:28 PM
Nope. They come with 110watt 12v plugs, but not 110v outlets. That seems to be a common misconception, not sure why they even bothered to label those plugs that way. It's just another cig lighter though. :o

So you can plug stuff in like a computer or battery charger for your camera but can't run your drip coffee maker or microwave from them?

nakman
04-24-2013, 03:46 PM
So you can plug stuff in like a computer or battery charger for your camera but can't run your drip coffee maker or microwave from them?
Pretty much. I'll show you this weekend how to jumper the relay, so you can leave the DVD player in back on all day and run that main battery down. :D