Cobra 4908 alarm, current drain and battery state.

[Jake Royd]

Could I ask if anybody knows how much current the above alarm uses in it's active state, ie. when the vehicle is locked. ?
Google and the manual don't seem to include this info.

I have just started up my motorhome (2.3ltr 2008 Ducato) after nearly 2 months of standing.
Batteries were fully charged when parked up.
The cab battery, at rest , before starting showed 11.7v which equates to about a 30% SOC remaining. Which batteries do not like.
The battery is of 'indeterminate' age.
I would not normally leave it this long.


It did , a little reluctantly , start the engine (jump leads etc. were at the ready but not needed.

The cab battery has a 20w solar maintainer linked to it but I suppose it's charge has been almost nil over the last 2 months.

Just trying to see if all is pretty much Ok or I should start thinking of a new cab battery, since the battery is still functional but not in the first flush of youth.

I replaced the hab battery last year with a 'quality' battery, this was at 12.7 which is very good but with no drain on it at all.

 

[TheBig1]

I am sure you will know, but that CAR alarm is not suited to a motorhome. They draw anything up to 300mA in set state, and the radio will draw some current too. All the little bits add up

 

[hilldweller]

Over the years its reported in here cab batteries last little more then 3 weeks with the load of modern electronics. You did amazingly well.

 

[Jake Royd]

I am sure you will know, but that CAR alarm is not suited to a motorhome. They draw anything up to 300mA in set state, and the radio will draw some current too. All the little bits add up

That's a worry , if you are right.
The Cobra is a 4908 Cat 2-1 Canbus version, which I know is fitted to lot's of motorhomes.
Thank you for your info.

 

[TheBig1]

That's a worry , if you are right.
The Cobra is a 4908 Cat 2-1 Canbus version, which I know is fitted to lot's of motorhomes.
Thank you for your info.

the fact it is canbus and switches with the central locking makes it next to useless, sorry

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[hilldweller]

Any help ? The install manual might have it.

<Broken link removed>

 

[Jake Royd]

Any help ? The install manual might have it.

<Broken link removed>

Thank you , I have looked there but with no luck so far.

 

[ramsthom]

This may help. The Corbra 4600 series motorhome alarm has a 12 milli amp drain when armed.

 

[ramsthom]

If its the same as the 4908 that equates to 17 to 18 amp drain over 2 months plus any other drain in the Fiat side. I've attached the installation guide where the info is on page 19. Could not find a one for the 4908

 

[Jake Royd]

Thank you , 12mA ( or about 1/8th of an Amp) seems plausible , say 20AH over 2 months would leave my 90AH battery at about 80% SOC or approx 12.4v IF it was brand new and there were no more parasitic losses.

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