s - Alternators, 2 Batteries and Inverters...

[nfpgasmask]

OK, I am thinking of a new mod that involves mounting a larger (1600-2000 watt) power inverter in the rear area of my VX so I can run some more luxury items while camping . Now, I could simply install the inverter and run cables up to my battery from there. However, it is my understanding that you want your inverter to be as close to the battery as possible. In this case, I want my inverter all the way in the back, so I will be running cables the length of the VX to get to the battery in this case.

Now, that said, installing a second deep cycle battery seems like it would be a cool idea, and I think I have the space to do it where I want to do it. But, given that, would I need to upgrade my alternator to handle charging 2 batteries? If so, what does an alternator upgrade entail?

A second (backup) battery seems like the optimal way to do this. This way, I can run stuff off the second battery (coffee maker, Hella lights, etc) while not running any risk of draining my main (starter) battery.

So, can someone break all this down for me? What is the *best way* to accomplish this?

Thanks,
Bart

[etlsport]

i upgraded my alternator with a 150a Alterstart alternator i got from biju

the install wasnt bad.. i had to raise the vx to articulate the suspension to get the old one out of the fender well.. other than that it was a pain to try to attach a 2/0 gauge wire to the alternator and had to get new battery terminals to support the wire size

ill effects... at idle the high output alternator only puts out 75 amps.. bumps to 150 at 1000 rpms.. made me nervous at first.. ive gotten used to seeing my idle voltage at 12.5 or so.. as soon as i touch the gas it jumps to 13.6-14.4

also my battery indicator lamp on the dash is always lit now because the circuit doesnt like the signal it gets from the alternators regulator (only supplies power when there is a draw, no extra to satisfy the stupid light that the alternator is working properly) so if i were to get my battery/alternator tested at autozone.. they would tell me its faulty.. even though ive driven like 3k miles on it

i believe that you will also need a system to divert power between the two batteries.. i think a PM to biju or spazz is in order

[nfpgasmask]

Thanks for the insight, E. Sounds like the 2nd battery/alternater upgrade might be something I should try to avoid.

So, that said, if I ditch the 2nd battery option and just run a bigger inverter up to my main battery, could I still do it from the back of the VX to the front? Or is that distance possibly too far? Or could I just get away with some heavier guage wire?

Basically, I want to avoid killing my main battery during a camping trip in the middle of the desert. That would be bad.

Bart

[snowtrooper1966]

You could alwats bring along "ROM: Spaceknight", and plug stuff into him
How about relocating battery to the rear?
Best,

[taylorRichie]

I personally think you're ok doing either of these.

A: Installing a second battery in the back, and no new alternator.
B: Installing the Power Inverter in the back with no alternator or battery.

I've ran multiple batteries, and 3,000 watts of amplifiers on a stock GM alternator, and it never went on me. I'd say start with Option B running a 0 gauge wire to the back of the VX to a fuse then to the Power inverter. Put it under the load you think will be typical while you're camping. If all seems well, roll with it for a while, keeping an eye on things. If you need to add a second battery, you'll already have the 0 gauge ran back there so installation will be a snap.

Thinks to keep in mind, Make sure you ground the battery with the same gauge wire as you ran the power. IMO Battery Isolators are unnecessary, but you may want to put one in if you're worried about the load on your alternator.

Worst case scenario, you start with just the inverter... then add the extra battery... then end up adding an alternator down the road. No need to get hit with everything at once.

Just my 2cents

[erland]

U Will Need To Install A Auxillary Battery Solinoid Which Will Only Open When Engine Is Running Or U Can Install A Battery Isolator. The Solinoid Will Cost Far Less And Should Be Rather Easy To Install U Just Need To Wire The Excitor Lead To The Cold Side Of The Ignition And Route Your Battery To Battery Cables Thru The Solinoid. This Is How The House Batteries On A Motorhome Get A Charge From The Engine Same Concept. Hope This Helps You Can Get 3 Or 4 Post Solinoid From Almost Any Rv Dealer. If You Are Really Industrius You Could Also Wire In A Switch If You Get A 4 Post Solinoid And Then Could Use The Secondary Battery To Start The Engine If The Engine Battery Were To Die.

[nfpgasmask]

Yeah, it would be ideal to just leave out the 2nd battery alltogether. That would make it simple, and much less expensive.

So, if I went inverter only, I could run my + wire up to the battery and then the - wire to ground, so technically I could get away with 15-20' of wire.

Bart