THIRD BATTERY, CHARGER WIRING.

[Texastom]

Morning all.
About to get a third leisure battery to boost capacity for winter trips.

Does it really matter where the pos and neg connections are made on the batteries (obviously pos to pos and neg to neg). Does the solar, and mains charger need to be one terminal on the furthest battery and the other on the nearest, or will any combination do? I've heard so many conflicting statements.
Hope I've explained that properly?
Also, I guess my Aldi 240 volt smart battery charger would definitely not be up to the job once I've got three batteries? Could someone recommend a decent not massively expensive replacement please?
Thanks everyone

Colin. This allows equal charging/discharging. I've used this method on my SLA's and they last at least 8 years of off gridding all year rund in the Highlands and OH's. Good luck and happy campimg

 

[Texastom]

Definitely.....off to the linked page now

Always best if batteries are the same type and age, otherwise the oldest/weakest pulls the others down. Voice of experience after learning the hard way, you'll get away with it for a while but eventually they'll faill..

 

[1 Cup]

, Chinese amps are not the same as UK... love that quote.

Yes 3 new batteries are always best but to get a working unit is a start. Love that 2...

Victron giving you 1 amp. If 300watt panels as least there working ...

If your usage is normal about 50amp a day so 3 days there .. just make sure the wire to fuse box is as big have u have or double it up to fuse box ...

Solar will wake up next year so battery charger 30amp is worth it money for now.as there wet battery's jump lead will work if looked after.

 

[trevskoda]

Im running the 10ah numax fixed inside van, no bother charging 3 of 90ah batts, or just the 2 les batts, you could go for the 20ah model.

 

[merl]

Always best if batteries are the same type and age, otherwise the oldest/weakest pulls the others down. Voice of experience after learning the hard way, you'll get away with it for a while but eventually they'll faill..

Weakest battery (WRT capacity/age) cannot possibly 'pull another down' it's electrically impossible and false information, a battery will only 'pull another down' if it has a lower potential. If the 2 batteries have the same chemistry and are charged from the same source then their potential will be similar and any current flow between them will be very slight and limited to few millivolts of 'balance' only, this current balance wont be lost, it'll be stored in the receiving battery. If you disagree please explain with science showing precisely how the electrons flow to achieve such a state of affairs. (anecdotes or parrot fashion information not allowed, we need REAL science or forget it)
Eventually ALL batteries fail that's inevitable but the weakest battery will fail first but that's to be expected, it's the weakest battery after all AND you'll have extended it's useful life by adding it to a system with the stronger battery.

 

[Mtbcol]

Well, after some research I've bit the bullet and ordered a victron 30 amp charger. Trying to future proof as it does lithiums as well.