Traxide SC 80 cut out

**landoman** · 5th December 2016, 02:16 PM

I have a traxide SC80 DB system installed with standard Denpfender OEM battery and optima yellow top as second battery

On the weekend trip I was checking my battery voltages after running my fridge for a night and a day and a night and the voltage on my main battery had dropped to 11.89 v

The SC 80 green light was on but not flashing so looks like it never cut out at 12 volts ..........is there a fault here in that my SC 80 is not cutting out and how do I check if it's working properly ...should it be flashing when cut out ?

My car had no problems starting at the 11.89 volts but I'm a bit concerned that if it's not isolated it might drop even lower to a point I can't start my car

Thanks

**alien** · 5th December 2016, 02:24 PM

If the light was still on the batteries are still conected.
11?89 vs 12?00 for the cut out could be in the gauge used.
If in doubt ring Tim, I rang him recently on another issuee and as always he was happy to help.

**landoman** · 5th December 2016, 03:30 PM

Originally Posted by alien

If the light was still on the batteries are still conected.
11?89 vs 12?00 for the cut out could be in the gauge used.
If in doubt ring Tim, I rang him recently on another issuee and as always he was happy to help.

So the light goes out when the bartteries are disconnected ......not flashing ?

**alien** · 5th December 2016, 03:58 PM

Originally Posted by landoman

So the light goes out when the bartteries are disconnected ......not flashing ?

When the light is on the batteries are conected.
Flashing indicates they are isolated from each other.

I normily get 2 days with the fridge on with cool ambiant temperatures before the isolator cuts out(I use the USI160 unit).
I'd try running the 2nd battery down a little more to a slightly lower voltage to confirm yours is cutting out.
As I've said talk direct to Tim as his after sales service is excellent.
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**landoman** · 5th December 2016, 04:06 PM

Thanks mate .....much obliged .....I'll turn on my fridge and run my optima right down and see what happens .....I should get a flashing SC 80 when it cuts out
......will that flashing keep up until I boost my cranking battery above 12 v

Didn't want to call Tim until I was sure of what I'm talking about so appreciate the help in clarifying my understanding ......

Also I have been told that to run your battery down to 12 v or lower is very bad for its life expectancy .........any thoughts on this ?

**austastar** · 5th December 2016, 04:34 PM

Hi,
Your fridge should have some smarts to prevent it over discharging the battery.
Cheers

Sent from my GT-N5110 using AULRO mobile app

**drivesafe** · 5th December 2016, 05:09 PM

Hi Landoman, your SC80 should have cut-out at 12.0v and I have them calibrated to somewhere between 12.0v and 12.07v.

With your cranking battery down to 11.89v at the battery, did you measure the auxiliary battery voltage at the battery?

Also, when it is convenient for you to do some tests, day or evening, give me a call and I will talk you though the tests and we can find out what is going on.

**drivesafe** · 5th December 2016, 05:15 PM

Originally Posted by landoman

Also I have been told that to run your battery down to 12 v or lower is very bad for its life expectancy .........any thoughts on this ?

One more point, unless you are cycling a cranking type battery down to 11.9v every day, or unless you regularly cycle one below 11.75v, you will not effect the life span of a cranking battery.

Before the availability of Deep Cycle batteries, cranking battery were used as auxiliary batteries, and not abused, they gave pretty good usage as an auxiliary battery.

A lot more to it but this is the basics for getting good use from a cranking battery as an auxiliary power supply.

**landoman** · 5th December 2016, 07:53 PM

Originally Posted by drivesafe

One more point, unless you are cycling a cranking type battery down to 11.9v every day, or unless you regularly cycle one below 11.75v, you will not effect the life span of a cranking battery.

Before the availability of Deep Cycle batteries, cranking battery were used as auxiliary batteries, and not abused, they gave pretty good usage as an auxiliary battery.

A lot more to it but this is the basics for getting good use from a cranking battery as an auxiliary power supply.

Thanks Tim

If I remember rightly both cranking and second battery were at 11.89 v and the green light on the SC 80 was light up
and not flashing ........

I have now plugged in my fridge ( its the only thing I run off the second battery )

I will run it to see if the SC 80 cuts out and at what voltage .....

The only other thing drawing on my DBS is my UHF radio ..This is hard wired to my Cranking battery so that I can always have use of it even if my second battery is run down .

Will give you a call after I check the voltages in the next few days

**landoman** · 7th December 2016, 06:12 PM

Originally Posted by landoman

Thanks Tim

If I remember rightly both cranking and second battery were at 11.89 v and the green light on the SC 80 was light up
and not flashing ........

I have now plugged in my fridge ( its the only thing I run off the second battery )

I will run it to see if the SC 80 cuts out and at what voltage .....

The only other thing drawing on my DBS is my UHF radio ..This is hard wired to my Cranking battery so that I can always have use of it even if my second battery is run down .

Will give you a call after I check the voltages in the next few days

Hi Tim

Well checked all the wiring was intact on the system then I ran my fridge and ran the batteries down......the SC 80 cut out ( flashing green light ) At 12.1 v ....good

I then turned on the engine and put some charge in the system to 12.34 v
and I ran the fridge again until the voltage dropped and again the SC 80 cut out at 12.1v with green flashing light ....good .....all working as it should

So I cannot explain why it failed to cut out on the weekend and let my cranking battery fall to 11.89v

1) It was an extremely hot day .......could this have affected it ?
2) I used the same volt meter to measure on both days so it's not the voltmeter
3) By moving it around to check the wiring did I inadvertently fix a loose wire ?
4) could I have a fault in it that caused it to not cut out .....and if so how would I check other than above

My SC 80 is about 12 months old and used on a defender and this is the first time this ever happened and I have driven it across Australia and over very harsh terrain

I also used another SC 80 for 4 years on a discovery with out problem so I have great confidence in the system ....just would like to understand what might have happened in this instance .

Many thanks

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