Lithium blowing fuses/circuits

[Beast]

Hi can you help pls l have a Hymer B578 2014 which has a reoccurring problem of blowing circuits ie habitation +drivers step + fridge since lithium batteries were installed, l have a anti surge unit plus all safety features but when l have this year for the 1st time plugged in the lithium charger whilst on hook up its seems to have blow either fuses or circuits AGAIN and the zig unit no longer turns on. My EBL unit is brand new and upgraded to handle lithium so am at a lose pls help
07721372239
Kind regards
Andy

 

[berni109]

Your problem only occurs when you switch the lithium charger on?
How is this mains voltage charger connected to the lithium battery?

 

[Beast]

Directly , taking a live feed from somewhere in the van
thanks

 

[Pausim]

What model EBL do you have?

 

[Lenny HB]

Your post is a bit confusing, I thought Zig units died with the ark.
What do you mean by upgraded EBL?
Your need to post some photos of your systems components & explane exactly what fuse is blowing under what conditions.

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[Beast]

I don’t know what the name is ,, zig,, it’s the internal control board for electric /water tank levels etc.
l don’t know what fuse is blowing as they all look ok.
The ebl was new upgraded to handle lithiums

regards

 

[Beast]

What model EBL do you have?

Ebl 29

 

[Pausim]

Pictures of the “Zig” part of the system and the new charger might help but without knowing how they have been wired it is a bit difficult to make suggestions. Perhaps you should contact whoever installed them.

I had an EBL29 and lithium battery on my last motorhome and they worked fine.

 

[autorouter]

Which fuses blow? Are they the ones on the EBL, or those external to the EBL, near the batteries for example? I think what is being called the Zig Unit is the control panel.

 

[Beast]

I’m not saying that fuses blow but that something isn’t working.
thxs

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[autorouter]

Do you have a multimeter? A few voltage readings at strategic points would be useful. Also an indication of exactly which circuits don't work.

There are two big latching relays inside the EBL that control the habitation circuits. One of the relays doesn't control very much, but it controls the step and step light, for example. It should be on more or less all the time, and doesn't switch off when you press the main switch on the control panel.

The other latching relay switches off when you press the main switch on the control panel. It controls all the other circuits: TV, pump, lights etc. That's why it's useful to know which circuits are working and which are not. Also what is the battery voltage, while things are working, and when they are not.

There is a big 50A fuse next to the leisure battery, and just near it is a small 2A fuse for the battery voltage sensing. If that 2A fuse blows, those two latching relays will not switch on, and the control panel will be off.

 

[Beast]

A multimeter ,,, your having a laugh if l we're an auto electrician l wouldn't be asking !!

 

[Spriddler]

A multimeter ,,, your having a laugh if l we're an auto electrician l wouldn't be asking !!

The two most essential tools for every m/h owner are a multimeter and a corkscrew.

 

[autorouter]

A multimeter ,,, your having a laugh if l we're an auto electrician l wouldn't be asking !!

You can't see electricity flowing, or feel electrical pressure, in 12V circuits anyway, so a multimeter is the only way to see what is going on. The alternative is swapping possibly faulty items for known good items, with a good chance of damaging the new items when you fit them. You can pick up a cheap multimeter for a tenner or so from any DIY store, which will be fine for basic fault-finding.

For example, one of the many possibilities is that the charger is faulty, and is outputting too high a voltage. That might trigger the control panel to shut down and/or the battery management system (BMS) to cut out. A single voltage measurement would check that. Another possibility is that (if you have solar panels) the solar controller has gone into 24V mode instead of 12V mode. It happens sometimes. Again, a single voltage measurement (when the sun is shining) would check that.