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post #1 of 9 (permalink) Old 24-05-2021, 19:22 Thread Starter
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Autotrail Apache battery connection

Hi. I’ve just ordered a couple of replacement leisure batteries today – after much debate I went for the Varta LFD90. However, I believe the wiring on my motorhome may not the make best use of the power. I have attached a diagram of the current connection arrangements from the solar panel, to batteries to inverter.

If possible, can you please advise on the following:
• Are the batteries connected properly to gain the best benefit from them? Would it be of benefit to remove the positive lead between battery No1 and the inverter and then connect from the positive terminal on battery No2 to positive terminal on the inverter?
• The solar controller positive and negative feeds are connected to just battery No2. Would it be of benefit if the positive was connected to one battery and the negative to the other battery?
If you got this far well done and I look forward to your replies.

Thanks for your help

Rob
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File Type: jpg Battery connection diagram.jpg (130.1 KB, 10 views)
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post #2 of 9 (permalink) Old 24-05-2021, 19:35
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Just a suggestion;

You have posted this in the Motorhome Facts Insurance forum, obviously that is incorrect, if you edit befor 59 minutes have elapsed, you can move it to a more suitable forum eg

https://forums.motorhomefacts.com/182-electrical/

I know connections must be correct in order to ensure 12v only is used ie in parallel NOT in series which would supply 24v.

I am sure a technical wizard will be along to advise, but if the current system of connections works, my approach would be to leave it as it is.

Any typo that I make means the errorists win.

Any comments above are only MY OPINION and should be read as that.

http://www.leslezards.co.uk
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post #3 of 9 (permalink) Old 24-05-2021, 20:52
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Quote:
Originally Posted by Haybobbob View Post
Hi. I’ve just ordered a couple of replacement leisure batteries today – after much debate I went for the Varta LFD90. However, I believe the wiring on my motorhome may not the make best use of the power. I have attached a diagram of the current connection arrangements from the solar panel, to batteries to inverter.

If possible, can you please advise on the following:
• Are the batteries connected properly to gain the best benefit from them? Would it be of benefit to remove the positive lead between battery No1 and the inverter and then connect from the positive terminal on battery No2 to positive terminal on the inverter?
• The solar controller positive and negative feeds are connected to just battery No2. Would it be of benefit if the positive was connected to one battery and the negative to the other battery?
If you got this far well done and I look forward to your replies.

Thanks for your help

Rob

The correct way to connect is as shown: This came from another poster/forum.
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Dave.
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post #4 of 9 (permalink) Old 27-05-2021, 09:25 Thread Starter
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Hi Dave thanks for passing on the information from another post.

Can anyone please confirm that the lower diagram is the correct way to connect the batteries to the solar panel feeds ie one positive feed to a battery and the negative feed to the other battery.

The other battery terminals then go to the inverter.

Thanks for your help!!
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post #5 of 9 (permalink) Old 27-05-2021, 11:30
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Rob found the original article with full explanations: https://caravanchronicles.com/guides...s-in-parallel/
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Dave.
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post #6 of 9 (permalink) Old 28-05-2021, 18:52 Thread Starter
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Hi Dave thanks for the info, hopefully will have a look at replacing the batteries over the weekend.

Cheers Rob
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post #7 of 9 (permalink) Old 29-05-2021, 06:14
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Neither of those drawings look right to me, we used to have to really good sparkeys on here and the both advised connecting to the plus on one and new on the other so you both put in and take out in a balanced way, I'll see if I have a drawing.
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post #8 of 9 (permalink) Old 29-05-2021, 06:18
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post #9 of 9 (permalink) Old 29-05-2021, 08:33
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This was/is the setup on my self build, it's a bit scruffy as this was a test setup to do the wiring for underneath the drivers seat on a 07 Citroen Relay, (there was over 25mm clearance between the seat and the battery posts) I had it checked by an auto electrician and he said it was as safe as it could be except I needed a fuse for one of the ancillaries as it would be going through a bulkhead and the was a minor chance of a short circuit.

But we're only concerned about the batteries main cabling which was 16mm2 to take the intended loads.




Note that the slightly thinner 10mm2 black & red cables are to the Solar Controller, and the very thin 4mm2 to take smaller loads.

Hope this helps.
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