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Adding a second battery..how to...with photos FAQ
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BusPriest
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PostPosted: Tue Jun 16, 2015 11:47 am    Post subject: Reply with quote

Thank you WT! That clears up a lot.

Ok a drew a diagram... Or tried to at least. I am not sure how the relay for the batteries is set up, but the instructions handle that, as I understand.
Does everything look alright here?

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WhirledTraveller
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PostPosted: Mon Jun 22, 2015 4:21 am    Post subject: Reply with quote

There are a number of problems with the diagram posted.

The alternator output goes to a post on the engine starter. Then from there, the current flows "back" to the starter battery and "forward" to the main fuse box in the front. This fuse box is where your headlights, wipers, dome lights, etc etc. get their power from. I wouldn't mess with it.

Edit: I misunderstood maybe your "green wire". I think you meant the blue wire (alternator sense wire). This would be correct if you are using a simple relay. If you are using an ACR, you don't need it.

If you want to run the radio and interior lights off the coach battery that is perhaps a worthwhile switch to make, but I wouldn't switch the entire front fuse box over if I where you. Headlights, ignition, wipers, etc should stay on the main, start battery. Beware of too much "hacking". Minimal modification from stock will make future troubleshooting and repair much much easier.
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72camper
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PostPosted: Wed Jun 24, 2015 6:15 am    Post subject: Reply with quote

JQ1492 wrote:

1) I have an Edgestar 630 high efficiency fridge. Can I run it off the 2nd battery indefinitely while I am driving, since the batteries are being recharged as I drive?


aeromech wrote:

I think so. The way it SHOULD work is that when parked, the batteries are separated. You can wire the fridge to run off the house battery. When you start the engine and voltage increases about 13 volts, that should cause the ACR to close and connect both batteries to the bus charging system (alternator). In transit, the aux battery feeds the fridge but is also being charged at the same time by your engine.


I was about to pose this question myself after reading this thread. I wouldn't be necessarily looking to run a fridge of that capacity, but more of one of your $80-100 dorm fridge. Other than that and probably an electric blanket or two, I wouldn't be running a lot of electrical items. The set up in the original post would suit me well for this? The most I'd probably stay at one spot without driving off somewhere else would be 2 days.

Thanks for all the advice and help.
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BusPriest
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PostPosted: Wed Jun 24, 2015 7:47 am    Post subject: Reply with quote

WhirledTraveller wrote:
There are a number of problems with the diagram posted.

The alternator output goes to a post on the engine starter. Then from there, the current flows "back" to the starter battery and "forward" to the main fuse box in the front. This fuse box is where your headlights, wipers, dome lights, etc etc. get their power from. I wouldn't mess with it.

Edit: I misunderstood maybe your "green wire". I think you meant the blue wire (alternator sense wire). This would be correct if you are using a simple relay. If you are using an ACR, you don't need it.

If you want to run the radio and interior lights off the coach battery that is perhaps a worthwhile switch to make, but I wouldn't switch the entire front fuse box over if I where you. Headlights, ignition, wipers, etc should stay on the main, start battery. Beware of too much "hacking". Minimal modification from stock will make future troubleshooting and repair much much easier.


Wt,

Thanks for your help. Green wire is suppose to be for simple relay. I agree on your point on too much hacking. Thanks!!
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The Quaint Gypsy
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PostPosted: Fri Jul 10, 2015 6:38 pm    Post subject: Part list? Reply with quote

I am sorry if reviving a dead post.. and sorry again if I missed this, but is there a complete list of what to get to install a second battery and what it needed to then set it up to run 110 volts items? I get lost in all the posts....

thanks kindly in advance =])
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BusPriest
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PostPosted: Thu Jul 16, 2015 12:11 pm    Post subject: Reply with quote

http://www.12voltplanet.co.uk/split-charging.html

This is great reading and really helped my understanding of this thread. You can see by my above posts my confusion on things. Haha
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LivinInnaVWBus
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PostPosted: Tue Aug 04, 2015 11:51 am    Post subject: Reply with quote

I just spoke with [email protected] Supply, he said it's not lucrative enough for him to make these at this time as they are so labor intensive. He is searching for a company to make them and taking names for a waiting list but from the sounds of it, I'm guessing it will be NLA. Even with this being the case, he was unwilling to share with me the wiring diagram because of intellectual property although he did tell me it reflects the original Westy wiring and I might be able to find a scanned copy of that or the GS diagram on the net, also that it uses a standard relay... which I've got some NOS Bosch relays hanging around. This seems like a very simple product to make, does anyone have the Germany Supply or original Westy wiring diagram for these? With the photos in this post, I'm sure I could figure it out, but a printed diagram would be ideal.
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Funny you should mention hippies. Bumped into a bunch of them when camping in Tofino. When they saw the bus it was like moths to the light. I had to beat them off with my yoga mat.

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Tcash
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PostPosted: Tue Aug 04, 2015 2:57 pm    Post subject: Reply with quote

LivinInnaVWBus wrote:
I just spoke with [email protected] Supply, he said it's not lucrative enough for him to make these at this time as they are so labor intensive. He is searching for a company to make them and taking names for a waiting list but from the sounds of it, I'm guessing it will be NLA. Even with this being the case, he was unwilling to share with me the wiring diagram because of intellectual property although he did tell me it reflects the original Westy wiring and I might be able to find a scanned copy of that or the GS diagram on the net, also that it uses a standard relay... which I've got some NOS Bosch relays hanging around. This seems like a very simple product to make, does anyone have the Germany Supply or original Westy wiring diagram for these? With the photos in this post, I'm sure I could figure it out, but a printed diagram would be ideal.

Got a link?
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grandpa pete
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PostPosted: Tue Aug 04, 2015 3:10 pm    Post subject: Re: Part list? Reply with quote

The Quaint Gypsy wrote:
I am sorry if reviving a dead post.. and sorry again if I missed this, but is there a complete list of what to get to install a second battery and what it needed to then set it up to run 110 volts items? I get lost in all the posts....

thanks kindly in advance =])


Go back and read the first three lines on the first page . That's why I took all the photos and did this thread .
then plug in an inverter to run LIMITED 110 volts
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LivinInnaVWBus
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PostPosted: Tue Aug 04, 2015 3:40 pm    Post subject: Reply with quote

Tcash wrote:

Got a link?


http://www.germansupply.com/home/customer/product.php?productid=16766
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wanderglobe wrote:
Funny you should mention hippies. Bumped into a bunch of them when camping in Tofino. When they saw the bus it was like moths to the light. I had to beat them off with my yoga mat.

Follow - The life of a daily driven 68' RHD Devon camper.
http://www.thesamba.com/vw/forum/viewtopic.php?t=597750
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Gregg in the 603
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PostPosted: Tue Aug 04, 2015 4:08 pm    Post subject: Reply with quote

Website says out of stock. That seems to be happening a lot with German Supply. Any other sources?
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LivinInnaVWBus
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PostPosted: Tue Aug 04, 2015 4:14 pm    Post subject: Reply with quote

Gregg in the 603 wrote:
Website says out of stock. That seems to be happening a lot with German Supply. Any other sources?


LivinInnaVWBus wrote:
I just spoke with [email protected] Supply, he said it's not lucrative enough for him to make these at this time as they are so labor intensive. He is searching for a company to make them and taking names for a waiting list but from the sounds of it, I'm guessing it will be NLA.


If I can get a wiring diagram for it, I'll likely make a few out of high temp, high gauge cloth covered wiring with NOS German Bosch relays.
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wanderglobe wrote:
Funny you should mention hippies. Bumped into a bunch of them when camping in Tofino. When they saw the bus it was like moths to the light. I had to beat them off with my yoga mat.

Follow - The life of a daily driven 68' RHD Devon camper.
http://www.thesamba.com/vw/forum/viewtopic.php?t=597750
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Tcash
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PostPosted: Tue Aug 04, 2015 5:37 pm    Post subject: Reply with quote

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LivinInnaVWBus
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PostPosted: Tue Aug 04, 2015 6:33 pm    Post subject: Reply with quote

Excellentttttttt! Thank you Sir!
I'll get supplies on order.
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wanderglobe wrote:
Funny you should mention hippies. Bumped into a bunch of them when camping in Tofino. When they saw the bus it was like moths to the light. I had to beat them off with my yoga mat.

Follow - The life of a daily driven 68' RHD Devon camper.
http://www.thesamba.com/vw/forum/viewtopic.php?t=597750
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telford dorr
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PostPosted: Wed Aug 05, 2015 12:06 am    Post subject: Reply with quote

I'd be inclined to use something like this for connecting batteries together, rather than a Bosch cube relay.
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PostPosted: Wed Aug 05, 2015 12:51 am    Post subject: Reply with quote

I got this off amazon the other day
PAC-80 80-Amp Relay Battery Isolator https://www.amazon.com/dp/B001EAWS6O/ref=cm_sw_r_awd_k.BWvbC6V8RX4
https://www.amazon.com/dp/B001EAWS6O/ref=cm_sw_r_awd_k.BWvbC6V8RX4

Instructions say to link two batteries together on main terminals. 12v constant on small and ground on other small. Going to use 4 gauge wire and add 2 audio fused, one between each battery and post. Hopefully this is the correct way?
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Tcash
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PostPosted: Wed Aug 05, 2015 9:07 am    Post subject: Reply with quote

This one is insulated.
http://www.colehersee.com/home/item/cat/169/24117/

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PostPosted: Wed Aug 05, 2015 10:10 am    Post subject: Reply with quote

BusPriest wrote:
I got this off amazon the other day

PAC-80 80-Amp Relay Battery Isolator

That should do it.

Quote:
Instructions say to link two batteries together on main terminals. 12v constant on small and ground on other small. Going to use 4 gauge wire and add 2 audio fuses, one between each battery and post. Hopefully this is the correct way?

Should be fine. Not sure you need two fuses - one on the aux battery should do it.
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BusPriest
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PostPosted: Wed Aug 05, 2015 12:13 pm    Post subject: Reply with quote

Should fuse panels be fused? I realize that sounds redundant.... That's why I ask.
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Tcash
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PostPosted: Wed Aug 05, 2015 12:35 pm    Post subject: Reply with quote

BusPriest wrote:
Should fuse panels be fused? I realize that sounds redundant.... That's why I ask.

To protect the cable to the fuse panel you could use a maxi fuse or a circuit breaker. Install it as close to the battery as possible.

These are pretty neat. They hook right up to the battery.
https://www.bluesea.com/products/category/16/72/Fuse_Blocks/Terminal_Fuse_Blocks

Good luck
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