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Old 09 March 2016, 16:55   #11
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Maybe one more (the same Battery) and VETUS switch

- Accessories - Electricity on board



I have this solution and it works.

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Old 09 March 2016, 17:04   #12
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Maybe one more (the same Battery) and VETUS switch

- Accessories - Electricity on board



I have this solution and it works.

Unless the switch is in the "both" position, that will only charge one battery at a time, which defeats the object of having a backup battery. With the Etec, you can use the built in split charging system to charge both batteries independently, otherwise you need a VCR/ACR or similar.
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Old 09 March 2016, 17:18   #13
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Battery Recommendations

Quote:
Originally Posted by Pikey Dave View Post
Unless the switch is in the "both" position, that will only charge one battery at a time, which defeats the object of having a backup battery. With the Etec, you can use the built in split charging system to charge both batteries independently, otherwise you need a VCR/ACR or similar.

Dave. If you switch to both when charging and one battery is well down on the other does it not drain the it so they become equal?


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Old 09 March 2016, 17:38   #14
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A car battery often gets used daily which is far better for the life of the battery (in fact any battery).

A flat battery in a car is far more easy to sort out than a boat. Nothing worse than the weather turning bad only to find your battery has gone dead.

If you don't have a dual battery system you could carry a jumper battery kit, this could then be used for the car or the boat. If you do get one make sure you get one with enough powere to crank whatever engine system you have (2000A for most diesels).

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Old 09 March 2016, 23:48   #15
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Thanks for all your comments. I dont want to replace the battery if I don't have to.

The jump start packs look a good idea. Having searched the net the Noco GB40 https://no.co/gb40 looks interesting. There are some impressive Youtube vids.
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Old 10 March 2016, 02:18   #16
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Thanks for all your comments. I dont want to replace the battery if I don't have to.



The jump start packs look a good idea. Having searched the net the Noco GB40 https://no.co/gb40 looks interesting. There are some impressive Youtube vids.

Yes I have a dual system but still carry s battery pack which does other things like torch, usb pick ups , pump and power sockets very handy!!


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Old 10 March 2016, 03:24   #17
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Dave. If you switch to both when charging and one battery is well down on the other does it not drain the it so they become equal?


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Sort of, the discharged battery will pull down the charged battery & most of the charging current from the alternator will go to the discharged battery due to the lower internal resistance. You can get very high currents flowing by connecting a discharged battery to a charged battery, you are effectively jump starting a dead battery, think about the size of jump leads! An ACR monitors the state of both batteries & only connects them together when the voltage of both is matched.
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Old 10 March 2016, 03:57   #18
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Sort of, the discharged battery will pull down the charged battery & most of the charging current from the alternator will go to the discharged battery due to the lower internal resistance. You can get very high currents flowing by connecting a discharged battery to a charged battery, you are effectively jump starting a dead battery, think about the size of jump leads! An ACR monitors the state of both batteries & only connects them together when the voltage of both is matched.


I only have battery switch 1-2 or both so I now charge one on road out and the other on the road back unless I know they are similar then I'll do both


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Old 10 March 2016, 04:19   #19
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I put the add a battery system onto mine with the acr relay. It works great, basically like said, there is no battery 1 or 2, you just have the house/accessory & start battery charging simultaneously without the need to switch from 1 to the other, simple on off switch for turning the batteries off with a position that will combine batteries to start if the starting battery fails. I have a 150 hp mercury and the add a battery mini system works perfectly for this alternator. I have the battery 1 battery 2 switch on my sailboat, and find the add a battery system is much simpler and a lot better.
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Old 10 March 2016, 05:30   #20
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I put the add a battery system onto mine with the acr relay. It works great, basically like said, there is no battery 1 or 2, you just have the house/accessory & start battery charging simultaneously without the need to switch from 1 to the other, simple on off switch for turning the batteries off with a position that will combine batteries to start if the starting battery fails. I have a 150 hp mercury and the add a battery mini system works perfectly for this alternator. I have the battery 1 battery 2 switch on my sailboat, and find the add a battery system is much simpler and a lot better.

That's exactly what I have, works a treat & is idiot proof. Also no danger of blowing the rectifier.
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