New dual battery and CTEK D250S

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azzad
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New dual battery and CTEK D250S

Unread post by azzad » September 23rd, 2013, 8:51 am

Hi All,

I am setting up my 2nd battery in my new ute (2013 Dmax) and am going to use the Ctek D250s as the charger and isolator. I have read a few things about possibly needing to include and additional relay for variable output alternators.

Can anyone explain what this is for and if it is required?

Thanks
Dazza

dod28
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Re: New dual battery and CTEK D250S

Unread post by dod28 » September 23rd, 2013, 4:20 pm

Just buy the one with inbuilt relay for variable alternator, will cost you about $14 over the standard one.

azzad
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Re: New dual battery and CTEK D250S

Unread post by azzad » September 23rd, 2013, 6:27 pm

How do you tell one from the other?

mnpalmer
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Re: New dual battery and CTEK D250S

Unread post by mnpalmer » September 26th, 2013, 10:19 am

I'm looking at doing the same but according to their website, you can use the solar input instead of the normal +12v input. The solar input will accept a lower voltage. The relay is if you want to run a solar panel as well. If I understand it correctly.. :)

mnpalmer
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Re: New dual battery and CTEK D250S

Unread post by mnpalmer » September 26th, 2013, 12:34 pm

Actually... ignore that. You still need the relay because you need it to switch via the ignition, otherwise it will charge non stop! :)

azzad
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Re: New dual battery and CTEK D250S

Unread post by azzad » September 27th, 2013, 12:43 pm

From what I have seen, the relay is only if you intend to input power on the solar input terminal, the relay is used to not allow charging on the solar input terminal unless the ignition is off.

The schematics I have seen dont show anything different on the normal alternator input terminal.

So long story short, as far as I can tell, you dont need anything additional unless you are going to use the solar input terminal???

Dazza

dod28
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Re: New dual battery and CTEK D250S

Unread post by dod28 » September 27th, 2013, 1:09 pm

With variable voltage alternator WITH additional relay:
Alternator output above 12.7V = Charge sent to alternator input
Alternator output below 12.7V = Charge sent to solar input
Ignition off/Solar panel output = Charge sent to solar input

With variable voltage alternator WITHOUT additional relay:
Alternator output above 12.7V = Charge sent to alternator input
Alternator output below 12.7V = Not enough voltage to activate charger
Ignition off/Solar panel output = Charge sent to solar input

azzad
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Re: New dual battery and CTEK D250S

Unread post by azzad » September 27th, 2013, 5:37 pm

dod28
It may just be the way its written but that doesn't make any sense to me.

Do you mean:

With variable voltage alternator WITH additional relay:
Alternator output above 12.7V = alternator input of D250s used to charge aux battery
Alternator output below 12.7V = solar input of D250s used to charge aux battery
Ignition off/Solar panel output = solar input of D250s used to charge aux battery

With variable voltage alternator WITHOUT additional relay:
Alternator output above 12.7V = alternator input of D250s used to charge aux battery
Alternator output below 12.7V = Not enough voltage to activate D250s charger
Ignition off/Solar panel output = solar input of D250s used to charge aux battery

Dazza

dod28
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Re: New dual battery and CTEK D250S

Unread post by dod28 » September 27th, 2013, 5:53 pm

I can see now how what I read could possibly be interpreted a couple of ways. I was just trying to keep it short and simple.
But yes you have got it right.
The schematics you were most likely looking at are missing the connection to the alternator input of the D250s, which could make it hard to understand.

mnpalmer
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Re: New dual battery and CTEK D250S

Unread post by mnpalmer » September 27th, 2013, 8:52 pm

why do you need the alternator input? You don't.. I've been chatting to c-tek about this. It makes sense as the diagram on their site states when using the relay, Ignition off, charge via solar, ignition on, charge via alternator BUT STILL from the solar input. The solar input will accept a lower voltage. In this situation, the regular input will not be connected.

Ordered one yesterday so will see if what I said above is correct but it makes sense to me.

dod28
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Re: New dual battery and CTEK D250S

Unread post by dod28 » September 27th, 2013, 9:09 pm

Whoops my mistake, I didn't look at the diagram properly.

azzad
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Re: New dual battery and CTEK D250S

Unread post by azzad » September 28th, 2013, 7:05 am

mnpalmer

Can you post a link to the diagrams from their website you are talking about?

I have already ordered 1 as well.

Dazza

mnpalmer
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Re: New dual battery and CTEK D250S

Unread post by mnpalmer » September 28th, 2013, 7:54 am

http://www.ctek-chargers.com.au/ctek-d250s-dual.html

The text to the right is confusing, but the diagram makes sense. :)

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