mrdanielmh
Member
So there is no physical difference just the firmware?
So there is no physical difference just the firmware?
How did you buy the lithium version if its not for sale anywhere? Direct contact?Correct..
And the firmware is just the
Low,charge,ok, voltage data metric points....
So same as all other BM2 in regards to monitoring function and history logging.
Ie.... they all work exactly the same.
Yes, as above. (direct import from china)How did you buy the lithium version if its not for sale anywhere? Direct contact?
@catfood12 Thank you, and I'm glad they have been a help to you.
Dont pay too much attention to the warnings & "low power" messages....
What's more important is the voltage measurement and the logging history.
For example an AGM battery may be 100% charged @ 12.6v but that's out the car on a test bench. As you soon as you connect the battery to a car the voltage will be a bit different.
The voltage will also drop when the car/van is powered up by say unlocking or opening a door...... all sorts of modules and pumps start running which will cause a drop in the voltage....
So you need to look at voltage the average and put it into context for that particular car/van.
So for your Car, is 12.0 low, does it still turn over and start?
When you charged it fully with your ctek did the BM2 readout over the next 24hrs show a gradual drop in voltage?
Does the voltage drop massively when you turn on the head lights?.
Let's see some 24hr screen shots and see what's going on.
Just received and fitted mine. To be honest, I am quite dissapointed. All I wanted was a percentage scale of charge but all I get on my Lithium setup is the voltage of the battery....and charging??. Perhaps need something that is actually set up for Lithium and will give me a percentage reading.They are not selling the lithium FW version openly.
It's just the one BM2 everywhere.
Not even sure if the will.
It's the same thing anyway...
Lithium batteries hold there voltage for 90% of the capacity, so you need a current-shunt style monitor.Just received and fitted mine. To be honest, I am quite dissapointed. All I wanted was a percentage scale of charge but all I get on my Lithium setup is the voltage of the battery....and charging??. Perhaps need something that is actually set up for Lithium and will give me a percentage reading.
Many thanks @Dellmassive still confused lol. I have the TN Power 100 and just need ( sorry, but cheap ) monitor that tells me when i need to consider recharging which I thought this may have done but not good. I get that you could look at the voltage but as you state in previous comments, it doesnt work efficiently with lithium, thanks again though pal.Lithium batteries hold there voltage for 90% of the capacity, so you need a current-shunt style monitor.
so for these batteries you need one with a built in monitoring or a shunt monitor.
I've detailed some over here :
Battery Monitoring -- How I Done It --
Battery Monitoring -- How I Done It -- Part #1 Battery monitoring is a very important part of your 12v system . . . . whether its just the vans starter battery or your leisure setup keeping an eye on the power in your battery bank will keep you from breaking down and make sure your weekends...www.t6forum.com
the best option would be the new Victron Smart Shunt, shown over here :
Battery Monitoring -- How I Done It --
Battery Monitoring -- How I Done It -- Part #1 Battery monitoring is a very important part of your 12v system . . . . whether its just the vans starter battery or your leisure setup keeping an eye on the power in your battery bank will keep you from breaking down and make sure your weekends...www.t6forum.com
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The BM2 will only give you a voltage reading, which is still helpful.
but for Lithium capacity you need a different style of monitor.
@Garny999 which Lithium have you got?
I’ve noticed the same thing on my CTEK. If I connect an external charger to the starter battery, the DC-DC kicks in and it’s charges leisure battery at the same time. I scratched my head over this for a while and came to the conclusion that the IGN feed to the CTEK is to override a low voltage from the starter battery when the engine is running rather than to turn on the DC-DC.Battery Monitoring related info:
just checked on the Renogy DC-DC (has an ignition feed)
same thing is happening here.
The starter is on EHU Victron 12v/15A charger, which is charging the starter battery.
The Renogy DC-DC is seeing the raised starter voltage and indicating the ALTERNATOR is running (even with IGN OFF)
The Renogy has started charging the Leisure battery.
Seems this is a feature of most modern DC-DC chargers . . . that even when they have the IGN/BCM RUN feed connected and switch off. They will startup when the starter battery voltage is high enough.
So with either EHU charger OR a solar charger connected to the tarter battery, both can be charged via the DC-DC
NO EHU, battery Low.
.
And ALT shown as OFF.
Then EHU connected to starter . . .
DC-DC now shows ALT power . . .
..
Victron shows 8A going to starter.
starter shows voltage increase. . . .
BMV shows 3.2A going to AUX battery via DC-DC . . .
and AUX battery shows a voltage increase.
Happy dayz . . . .
No, agreed. I think the same.I’ve noticed the same thing on my CTEK. If I connect an external charger to the starter battery, the DC-DC kicks in and it’s charges leisure battery at the same time. I scratched my head over this for a while and came to the conclusion that the IGN feed to the CTEK is to override a low voltage from the starter battery when the engine is running rather than to turn on the DC-DC.
I think the way it works is the DC-DC will charge based on the voltage it detects on the starter. Because a smart alternator vehicle will allow the voltage to drop lower than a standard alternator there are likely to be situations when the DC-DC would not charge if purely based on the voltage detected. So, it has an override which forces a charge when the ignition is on. This in turn makes the voltage drop on the starter battery which won’t be a problem if the engine is running as the alternator will then kick in.
When connecting an external charger to the starter battery, the DC-DC detects the higher voltage and kicks in....
I don’t know for sure this is how it works but this is how my brain worked it through. Happy to be corrected.
Bm3...... but paid for???
Not sure bout that.
View attachment 68307View attachment 68308View attachment 68309
....
@mmi link from above in thread. (Free)
BM3 APK for Android Download
BM3 2.0 APK download for Android. can manage multiple 12V, 24V,48V batteries ,as well as solar battery.m.apkpure.com
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