Help Please -No 12v

Alshymer

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Hi
Looking for a little help please.
I woke up this morning and the control panel is dead. No 12 v at all.
It was working fine yesterday and the Victron Battery Master showed around 80% Lithium capacity.
Not even the Victron is showing a reading now.
Where to I start? Is it a fuse? Has the battery decided to give up? It’s 2.5 years old.
Have been running the engine but still no joy.
Any help much appreciated as we are living in the van at present.
Kind regards
Alshymer
 
No power and no display on Victron monitor suggests to me no power at battery. If it were a fuse, you would probably still have a display on the monitor (assuming installed right) as you don't get get multiple fuses all blowing together.

It could be totally drained by something or ... Some lithium batteries have a switch on the battery box to turn themselves off or to reset after an over-current fault.
I would check for a switch first off on the battery. Also check the voltage at the battery terminal with your multimeter (and if you don't have one, you need to get one. Essential in a van , especially if you are full-timing).
 
Hi
Thanks so much for your quick reply.
I have now driven cor half an hour and the 12v has returned!!
The Victron reads 100% but at 12v and the engine is putting in 32ah, reducing now.
I am wondering whether maybe the Victron is giving me false readouts and needs replacing.
We have been living in the van for 5 months off grid with no problems until now.
Last night when turning the Oyster off I noticed the display said power supply failure. To get the dish down I turned off the 12v to reset.
After turning back on the Oyster went down and the control panel was fine.
This morning nothing!!
Kind regards
Alshymer
 
Something to be aware of with the Victron BMV Monitors ... The default setting on them is that if they loose the power to them, when they get power back, the SoC (State of Charge) resets back to 100%.
So when you turned off the 12V to reset the Oyster Dish, it is possible (if the BMV was installed in a non-standard way) for the BMV to have reset back to 100%. So that 80% you read before, and especially the 100% you are reading now, is likely to be false. It is not a fault with the Monitor, just the way they work.
If you were putting in 32A into the battery, it cannot be at 100% of course, as you already suspected.
The only way to get the Monitor back on the right reading is to fully recharge the battery e.g. Keep charging until it is not taking any (or only very minimal) current. And only then will it be back on 100%.

Assuming you can use the Victron Phone App - VE.Connect - to look at the Monitor, I would also suggest having a look at the settings in the Battery Section (press the Gear icon top right and then select Battery) and think about turning OFF the automatic sync to 100% on Monitor Reset (see screenshot below and highlighted area). Instead of seeing 100% on reset, you will get just "--", but it will mean just as much as a false "100%" display and at least you will know there has been some kind of glitch with the power and you are not relying inadvertantly on an incorrect SOC display and thinking you have more battery left then you really do.
All you would then do to get back an SOC percent display back is to click on the "Synchronize SOC to 100%" when appropriate
bmv-sync.png
 
Last edited:
Does this look ok to you for 1x100ah lithium Relion 100hp
 

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Seems fine off the top of my head.
It is always better to have the monitor setup so it is harder for it to get to 100% full rather than it jumping to 100% too early. That is easily done as well when Solar Harvesting is poor such as current time of year ... the current from the panels can be so small the Monitor can see that as all the battery is able to take and jumps to a conclusion. Your present settings should not let that happen (y)
 
Hi again.
Just so that I know what I am doing!!
I wait until the battery has been on hookup(which it now is) and there is no more current flowing into it.
Do I then do nothing more?
OR
Do I then manually synch to 100% leaving the auto synch in the left position permanently?
Then in a few weeks if I am on hook up again, do I re-synch manually again?
And so on?
Thanks again
Happy Christmas
Alshymer
 
I would keep it on "do not auto reset to 100%" permanently. it makes no difference to the calculations, just stops it resetting to 100% on a power loss.

Victron say it may be neccessary to do a resync of the SOC periodically as it can go out by a percent or two over time.
 
Hello again
Well everything seems fine now although the reading is 100% and 14.04v.
Should it read - - - instead of 100%?
Regards
Martin
 
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