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Old 27 October 2019, 18:11   #1
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twin battery trickle charge question

this is the batery tray from my Atlantic 75 Ex rescue service Rib. i have posted here before when it had 4 batteries - i have now reduced it to two. The wiring is fundementally the same - instead of four negaives being tied together, its now two. Each anderson plug feeds a port or starboard engine circuit. If you are in anyway interested you can see a photo on an ipad at the bottom of my thumbnail showing the original RNLI 4 battery tray. So my question is - with my negatives tied together - if i wanted to put a trickle charger on these batteries - can i use two chargers wired with anderson plugs and simply plug them in to the two circuits you see here. im guessing it should work as when the engines are running the "altenators" are effectively doing exactly the same thing...?
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Old 27 October 2019, 18:49   #2
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Why are the negatives linked together?
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Old 27 October 2019, 18:56   #3
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Why are the negatives linked together?


They should be
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Old 27 October 2019, 19:05   #4
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They should be


Apologies, I read it as feeding an engine each.
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Old 27 October 2019, 19:28   #5
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Why use 2 chargers ? If its just to keep the batteries topped up then you could link the two positives & just use 1 charger.
No different to the way they were charging when you had 4 batteries in use
Obviously you would remove the link before plugging back into the engines
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Old 28 October 2019, 03:52   #6
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This is the correct way to connect two batteries
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Old 28 October 2019, 04:58   #7
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He has two separate circuits, one for each engine. It all ends up at a common negative so linking them at the battery is fine.

For me and if you have two chargers I'd disconnect the negative link between the two batteries and then plug the chargers into the Anderson connectors.

I think it would be fine to leave the batteries connected but I'm never sure what the impact is on the smart bit of the charger, assuming your trickle charger is a smart charger.
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Old 28 October 2019, 05:17   #8
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He has two separate circuits, one for each engine. It all ends up at a common negative so linking them at the battery is fine.

For me and if you have two chargers I'd disconnect the negative link between the two batteries and then plug the chargers into the Anderson connectors.

I think it would be fine to leave the batteries connected but I'm never sure what the impact is on the smart bit of the charger, assuming your trickle charger is a smart charger.


I have a double battery setup & leave the batteries “combined” when I connect the charger when she’s laid up. I use a Ctek xs7000, no issues.
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Old 28 October 2019, 05:33   #9
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I have a double battery setup & leave the batteries “combined” when I connect the charger when she’s laid up. I use a Ctek xs7000, no issues.
Cheers Dave

OP - Yes is the answer.
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Old 28 October 2019, 12:28   #10
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I have a double battery setup & leave the batteries “combined” when I connect the charger when she’s laid up. I use a Ctek xs7000, no issues.
+1

Current drops back to about 60mA once they're charged up (2 X 75AH).

The digital ammeter is handy, lets you know if you've left something switched on. eg.

https://www.ebay.co.uk/itm/DC-0-100V....c100005.m1851
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Old 28 October 2019, 16:02   #11
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Thanks all - i think i will disconect the combined negative as i dont need it on the set up out of the boat. i have ordered two of the same Ctex xs 7 Chargers. I have some old copper pipe that fits nicely inside the anderson connectors and will solder in well. i can flatten one end of it, drill a hole and use some nuts and bolts to connect to the spade endings on the cabling from the chargers. i just need to remember to reinstall the tied negative before next season. thanks again.
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Old 28 October 2019, 17:53   #12
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Originally Posted by 747sp View Post
Thanks all - i think i will disconect the combined negative as i dont need it on the set up out of the boat. i have ordered two of the same Ctex xs 7 Chargers. I have some old copper pipe that fits nicely inside the anderson connectors and will solder in well. i can flatten one end of it, drill a hole and use some nuts and bolts to connect to the spade endings on the cabling from the chargers. i just need to remember to reinstall the tied negative before next season. thanks again.


Why bother faffing, the cteks come with crocodile clips. Just put them straight to the battery posts.
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Old 29 October 2019, 06:29   #13
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You are right... but I do love a faff. It is an area beyond the long arm of home compliance...
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Old 29 October 2019, 06:48   #14
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You are right... but I do love a faff. It is an area beyond the long arm of home compliance...


I know what you mean, I’m in the middle of a major faff meself
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Old 29 October 2019, 14:46   #15
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Tow bar rack gone out the window Dave?
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Old 29 October 2019, 15:00   #16
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Tow bar rack gone out the window Dave?


Yup, there’s no way would it all have fitted in
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Old 29 October 2019, 16:29   #17
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Originally Posted by 747sp View Post
Thanks all - i think i will disconect the combined negative as i dont need it on the set up out of the boat. i have ordered two of the same Ctex xs 7 Chargers. I have some old copper pipe that fits nicely inside the anderson connectors and will solder in well. i can flatten one end of it, drill a hole and use some nuts and bolts to connect to the spade endings on the cabling from the chargers. i just need to remember to reinstall the tied negative before next season. thanks again.
That is just the type of over engineered solution that I subscribe to.
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Old 29 October 2019, 16:32   #18
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Yup, there’s no way would it all have fitted in
Thread hi-jack but is that some sort of sliding engine bed?
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Old 29 October 2019, 16:58   #19
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Thread hi-jack but is that some sort of sliding engine bed?


Yup a rolling floor.
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