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Discharging battery


Brizzy63

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Posted

Replaced my Fiat Ducato battery in August 2022 with a Bosch Car battery 12v 100Ah Type 019 S5013. After a good run battery gets to 12.8v but discharges to 11.8v after a week at rest. I have previously had issues with the radio but disconnected this. So far motorhome has started first time but I am concerned that battery is not performing as it should.

Posted
26 minutes ago, Brizzy63 said:

I just message the motorhome. We have the old van bitz strikeback set up. Assume the info it sends back is correct.

It may or not be the actual battery terminal voltage. On my MH the voltage at the 12v sockets is about 0.3v lower than at the battery terminals .

Posted
31 minutes ago, Brizzy63 said:

I just message the motorhome. We have the old van bitz strikeback set up. Assume the info it sends back is correct.

If we guess this is a x250/290, the vehicle battery discharges on them at the best of times, add in extra's like strikeback and you can expect it to be worse.

Posted

You really need to measure the voltage at the terminals to get a true reading.

As Colin says, there is always some kind of parasitic draw with modern vehicles.

It would pay you not to let the voltage drop too low - as it appears that this can be one of the common issues with the dreaded Airbag ECU failure.

Even if you have solar [and that is configured to charge the starter battery] it still pays to give a top up charge via EHU, especially at this time of year.

Posted

Brizzy63's motorhome is a 2009 Bessacarr model.

This 2012 forum thread discussed unusually high starter-battery discharge on Ducatos built around then

https://forums.outandaboutlive.co.uk/topic/25845-battery-drain-on-a-new-fiat-23-euro5-enginge/

It was a fairly common complaint, but I don't think a guaranteed solution was ever arrived at.

Given the age of the motorhome, it might be worth replacing its earth strap or adding a supplementary strap. This is one of those ploys that should do no harm and just might do some good. It's been suggested here many times when Ducato/Boxer electrical maladies have been asked about - sometimes it works magic; sometimes it does not.

https://www.aandncaravanservices.co.uk/earth-strap-problems.php

Posted

If there is a  rear camera fitted it may be worth checking that it is not using some power even when off , as it may be in a standby mode . 

Posted

Thanks for your replies. Tested battery at the terminals. Got a reading of 12.2V after a week, got to 13.2 after a 50 mile run out. Seems to be starting ok.

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