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Personally. I wouldn't combine controllers. I would have a mppt controller separately. Less single failure points. From what I have learnt here. The alternator plus solar will charge a battery but never to full 100%. You want to spend the money to get a decent shore charger. I would get one...

Since your looking at putting the second battery outside the engine bay. I would suggest getting 2 fuses at putting them within 30cm(12inch) of each battery and connecting them to the + positive wire. It protects the wiring if it starts rubbing against something and exposing the wire, or having...

Where it's mounted, depends mostly on the vehicle. Where is there room to fit the battery? Can you run the cables to that place? Where can you put switches? Where can you put the fuses? Do you need to drill a hole? Will it be waterproof? etc.

Yes you can, if you remove the power source to the solenoid, then the wire after the solenoid to the aux battery will not be hot, if you remove the aux battery. Make sure the positive wire is insulated after removing the battery just in case the solenoid is engaged, i.e. you accidently flip the...

Thanks, dwh, I have learned a lot from your posts. I would have thought that the starter motor would take power from everywhere it could. And didn't think about listening to the radio. So in that case, it doesn't matter if the solenoid is engaged or not when starting the vehicle if the aux...

Note: the smaller the number the bigger the wire size. 8 is bigger than 12, 4 is bigger than 8. It never hurts to go bigger except than the wallet Depends if you want to self jump start using the aux battery. If you do then I wouldn't go smaller than 4 AWG (25mm2). If you don't then it...

I'm just wondering, Would it be possible to run wires between both batteries, and the charge controller through a standard 5 pin automotive relay. Where one battery is connected to the Commonly Open, the other battery is connected to the Commonly Closed and the output of the solar controller is...

This is what you mean, correct? 1. 2.

I think I understand what you mean. I'll redraw the diagram, both ways and check what your saying.

Thanks, It really should say "Factory Wiring & Fuses" I guess then. I'm not exactly sure how the factory wiring works from battery to (i.e.) ACC wire. So it really means I can't draw in what I don't know. I wasn't going to play around with the factory wiring other than splicing in a couple of...

I know its not proven yet but I have posted about my Car Second Battery and Accessories, I think the theory is sound. The idea of my diagram would work for your needs as well (just a lot more complex). How much current would your aux devices use? What size wires were you thinking of? A...

Revised Diagram I've started to modify the diagram, I'll move the fog lights and the windows to another diagram as well. Thanks

I haven't heard the term SPOD before but from googling I think you are referring a set of switches within a panel. I was thinking something similar but with individual switches drilled through the dash board, to control the roof lights I think I have them isolated, except that when the...

Some Idiot went through a stop sign and totalled my car, so I have to get a new one. I had some basic electronic features in the old car, that I want to add back, plus add some that I didn't have. I got a remote relay system like this, it has four relays, each button controls a relay I would...

Sorry, I should have said the timer relay is adjustable Thanks, that is a good idea. If I get a second timer relay, and wire it just after the remote, that would fix that

I'm Looking into how to make my own remote start From Aliexpress, I bought a relay with a remote, a timer relay, and 2 normally open relays. (I'm waiting for it to arrive) Is this theory correct? ... 1. The button on the remote is pushed which energizes the relay on the receiver board. 2. That...

Thank you, That is helpful. This is the first time I've created a diagram like this. I'm planning on taking this to an auto electrician and getting them to help me put all this in. I have a very basic knowledge of circuity and a cars electrical system I took ideas from here using evldave...

Anyone? Does anyone see a problem or something that could be improved? Thank you

Sorry, First Time Posting here, unable to post link, Photo is in higher resolution now. I haven't used Microsoft Visio that much forgive any inconsistencies

I brought a new car and want to wire a Dual Car Battery and Accessories. I made this Wiring Diagram over the last week I haven't bought most of the items yet, I've been looking at Aliexpress and this is cheapest / safest way I can see. I want to self Jump start I want to add a second 12V...