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Old 11-27-2014, 12:37 PM   #1
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Default battery charge SCR2700

Gents, I have printed the manual from a more recent SCR2700, which states that when charging the battery I should have the switch
on either battery 1 or battery 2 but not on both. Does anybody know why, I have seen that when on battery 1 it charges a small current,
when on battery 2 nothing, when switched on both I draw 80% of the current the source can do.
Is there any reason why not charge both batteries in paralel.
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Old 11-27-2014, 12:54 PM   #2
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Not sure how yours is wired but for most boats the charger is a dual bank with a bank wired directly to each battery and not through the switch. If the switch is in the both position these two banks will be tied together and damage the charger.

Trace he wires from thecharger and see how it is wired.
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Old 11-27-2014, 03:01 PM   #3
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In general, you want to charge batteries under isolated banks. When paralleled, if one battery goes bad, it will prevent the other battery from charging. Conversely, if one battery is fully charged, it will hide the load draw of the other battery, again preventing the other battery from charging.

There is nothing "wrong" with doing it, but its not a good idea.

On my boat, each switch is specific to a battery, not each battery to a position on the switch. So, for normal operation, both switches have to be on 1. Putting one switch on 2 or both will do nothing unless the other switch is on 2 or both.
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Old 11-27-2014, 03:24 PM   #4
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I turn mine off when plugged in with the battery charger on.
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Old 11-27-2014, 04:05 PM   #5
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Quote:
Originally Posted by Kevlar7r View Post
In general, you want to charge batteries under isolated banks. When paralleled, if one battery goes bad, it will prevent the other battery from charging. Conversely, if one battery is fully charged, it will hide the load draw of the other battery, again preventing the other battery from charging.

There is nothing "wrong" with doing it, but its not a good idea.

On my boat, each switch is specific to a battery, not each battery to a position on the switch. So, for normal operation, both switches have to be on 1. Putting one switch on 2 or both will do nothing unless the other switch is on 2 or both.
Kev your wiring is different as have 2 engines and the OP has a single. You are also correct in your description of how 2 batteries will respond to charge when connected on parallel, however the issue is in the OPs set up he is connecting the 2 banks of the charger together which can damage it.
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Old 11-27-2014, 04:07 PM   #6
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Quote:
Originally Posted by Phillbo View Post
I turn mine off when plugged in with the battery charger on.
IMO this is a good proceedure so that the batteries are the only load the charger sees other than the bilge pump which is typically not running. Since you are on shore power the boats load can be ran on that.
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Old 11-28-2014, 04:01 AM   #7
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Keep I mind that even when plugged into shore power, shore power doesn't run any 12V. That comes through the batteries. 12v draws from battery and charger replaces amp draw back into batteries again. So this means, lights, pressure water pump, electric flush and vacu-flush toilets, etc.
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Old 11-28-2014, 08:03 AM   #8
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On my 2400 SCR, when it is hooked up to shore power and battery charger is on, and the battery switch is in off position, it charges both batteries.
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Old 11-28-2014, 12:30 PM   #9
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I keep my refrigerator on, so turning off the batteries wouldn't really work for me.
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Old 11-28-2014, 01:25 PM   #10
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Quote:
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I keep my refrigerator on, so turning off the batteries wouldn't really work for me.
Isn't your frig a dual volt? Most are and switch to shore power when plugged in.
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