Battery master not working - Motorhome Forums, Motorhome Discussion, Motorhome Chat

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post #1 of 10 (permalink) Old 16-03-2019, 13:46 Thread Starter
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Battery master not working

Hi all,
i had a battery master fitted last september as we were leaving the van unplugged in portugal over winter. I flew out last weekend to check things and both the engine and hab batteries x2 were completely dead. I couldnt even get the step out to get in and the lift for hubby wasn,t moving at all. The control panel was blank etc etc.......... you get the picture
After 48hrs plugged in the hab batteries are up to 11 but the engine battery still won't turn over at all.
Any thoughts on what we've done wrong??
Cheers
Ruth
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post #2 of 10 (permalink) Old 16-03-2019, 13:53
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A battery master usually charges the vehicle battery from any surplus solar charge going to the leisure batteries, if you're leisure batteries were also dead then it sounds like there was something wrong with your solar controller? Leisure batteries can be damaged if completely drained so you might need new ones

Before you criticise someone walk a mile in their shoes, that way you are a mile away and have their shoes too
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post #3 of 10 (permalink) Old 16-03-2019, 15:22 Thread Starter
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thanks. the leisure batteries were brand new at the same time as the battery master. so if its the solar controller how will i know? the solar panel was reading 13.4 as it was very sunny when i was there.
is there a simple way to test it? i'm not technical and will be driving it back through spain which is not my first language
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post #4 of 10 (permalink) Old 16-03-2019, 15:50
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hi

just a thought whereabouts are you in portugal

im in the algarve


barry
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post #5 of 10 (permalink) Old 16-03-2019, 16:15 Thread Starter
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Hi powerplus,
i'm back in the uk now but trying to plan what to do before we both fly out in may.

Cheers
Ruth
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post #6 of 10 (permalink) Old 16-03-2019, 17:07
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If the LB is dead too then there is a fault.

The BM only feeds SURPLUS power and should protect the LB, but it was pointed out on here some while ago, that if the VB drops it's voltage the LB may well effectively HAVE surplus and so feed it over.

The VB drains if the alarm is switched on and the solar panels should be able to cover that drain, of course there are other drains on the VB such as the clock and the radio. We found that WITHOUT solar input the Vb could only power the vehicle for around 2 weeks "off charge".

Sorry, the answer is not quite so clear - obviously solar input depends on where the vehicle was parked and the weather as well as how big solar panel system you have.

Is there a fuse between the solar input and the LB ? If that has blown then in spite of any solar input at the charger it may not have got through. You may find it useful to check the voltage at the battery - it should indicate if the solar system is actually supplying power to the batteries.

Sadly, once a battery has gone flat it may well never recover as the plates in the cells may have been damaged - that could mean new batteries all round....

If needed buy those in the UK for de.ivery to a campsite or wherever you are staying - that is a MUCH cheaper option than buying in France, Spain or Portugal IMO.

We use Tanya Batteries whose delivery service has proved excellent and their prices the same.

Mr Google will find Tayna very easily - their batteries are suplied filled and ready to go, whereas batteries in France need filling with acid - adding to the expense and hassle. We got delivery within 48 hours....

Obviously a few MORE things to think about.....
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Remember Jo Cox and what she stood for.

Any comments above are only MY OPINION and should be read as that.

http://www.leslezards.co.uk

Last edited by Penquin; 16-03-2019 at 17:16.
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post #7 of 10 (permalink) Old 16-03-2019, 18:29 Thread Starter
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Thank you Mr Penguin for that comprehensive reply. I think i understand most of it. Clearly there is a problem with the system and i will get f-in-law to check all of the suggestions.
many thanks again to you all
Ruth
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post #8 of 10 (permalink) Old 16-03-2019, 19:00
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Happy to help in any way I can, good luck and of course, feel free to come back for any other help needed, or f-I-l if he needs it.

Remember Jo Cox and what she stood for.

Any comments above are only MY OPINION and should be read as that.

http://www.leslezards.co.uk
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post #9 of 10 (permalink) Old 17-03-2019, 11:13 Thread Starter
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apologies if i dont reply...away from main computer for a while and ipad site wont let me log in......i've asked several times for a reset
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post #10 of 10 (permalink) Old 17-03-2019, 11:15
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No probs, you have got in this time thankfully 😁

Remember Jo Cox and what she stood for.

Any comments above are only MY OPINION and should be read as that.

http://www.leslezards.co.uk
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