Victron Battery Monitor
- Thread starter irnbru
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Two on Tour
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This video will give you the info you need and if you want to go ahead with it, then I can point you in the direction of the bits you need and can make up a VE.direct cable for you if you want.
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irnbru
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Thanks, Im half way through the video, will watch the rest tonight but Yes I think its something I would do if ive got you to guide me. Only heard the words Raspberry PI before but never knew what it was or know anything about it yet.
pau1phi11ips
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I use the relay out to switch on a 20W battery heater when the temperature is less than 10 degrees C. It's LiFePO4 so can't be charged when it's below zero.
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irnbru
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Can someone tell me in simple terms how my batteries are doing so I can learn please. They are gel batteries. I’ve got about 25 percent left to use but that’s all I really know.
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How long since you were last hooked up?
Lenny HB
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Wrong way round they are 76% charged.
The percentage reading is not always accurate it takes a lot of playing with settings to get it right, best to go by current withdrawn.
You don't say what size batteries assuming you have 2 x 80ah which gives you 160ah.
Since the last full charge you have used 45ah which is 28% used so your batteries are at 72%, so your percentage reading is fairly accurate
The percentage reading is not always accurate it takes a lot of playing with settings to get it right, best to go by current withdrawn.
You don't say what size batteries assuming you have 2 x 80ah which gives you 160ah.
Since the last full charge you have used 45ah which is 28% used so your batteries are at 72%, so your percentage reading is fairly accurate
Which isn't too bad for a weekend in winter, in my opinion.
And gel batteries can cope with going down to 20% state of charge so you are doing fine.
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'Last discharge -45Ah' tells you how much you have used since the last charge.
'76%' means it thinks you have 76% of charge remaining, so you have used 24%.
So it thinks 45Ah is 24% of your battery capacity. so it calculates that 100% is 188Ah.
You can look at your battery labels to see if that is a good indication of your actual capacity, remembering that batteries lose a few percent capacity every year.
'76%' means it thinks you have 76% of charge remaining, so you have used 24%.
So it thinks 45Ah is 24% of your battery capacity. so it calculates that 100% is 188Ah.
You can look at your battery labels to see if that is a good indication of your actual capacity, remembering that batteries lose a few percent capacity every year.
autorouter- thank you, this is helping me understand my set-up or at least I thought so.
I have 2x 110Ah lithium batteries, Victron Smart-shunt, Victron IP22 mains charger, Victron B2B charger and Victron MPPT solar controller. The van is kept indoors so solar isn’t operative and the IP22 is connected to timer so comes on every 2 weeks or so for 90 mins.
So, today I went for the periodic check to see aa’s ok and I attach screen shots of the Shunt.
This shows the SOC at 88% and the last discharge of 43Ah. The Shunt therefore shows that 43Ah took 12% of the 220Ah batteries.
Have I understood your response to the poster correctly? It’s a steep learning curve for me! Many thanks.
I have 2x 110Ah lithium batteries, Victron Smart-shunt, Victron IP22 mains charger, Victron B2B charger and Victron MPPT solar controller. The van is kept indoors so solar isn’t operative and the IP22 is connected to timer so comes on every 2 weeks or so for 90 mins.
So, today I went for the periodic check to see aa’s ok and I attach screen shots of the Shunt.
This shows the SOC at 88% and the last discharge of 43Ah. The Shunt therefore shows that 43Ah took 12% of the 220Ah batteries.
Have I understood your response to the poster correctly? It’s a steep learning curve for me! Many thanks.
Lenny HB
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Could do with a bit of tweaking your batteries are actually at 80.5% assuming they are charged to 100%.
43ah is 19.5% of 220ah.
Edit:
That is wrong see post see post 77
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Thank you, I appreciate the point. Not clear on what the required tweaks are. I appreciate that, unlike the OP, I know what capacity my batteries are (220Ah) and so using @autoroute’s arithmetic gave me a figure in excess of the 220Ah. But was hoping that the readings would work back to give 220Ah.
What is the difference between the consumed Ah and last discharge?
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I don’t know. It‘s a question I have too. I’d have assumed that the last date of full charge formed the base line for seeing discharge but I suppose, thinking about it, it might not always be the case that the batteries are fully charged. So the consumed Ah might be from a less than full battery whereas last discharge is from last full charge.
Lenny HB
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I got my figures wrong as I took what Ingwe wrote.
Victron don't tell you but I think Last discharge is the current taken from the batter since the last full charge.
Consumed ah is the current taken from the battery since last discharge minus and charge into the battery.
So 31.5ah and 88% is about right, 86% would be spot on but I don't think you will get it much more accurate.
The older shunts didn't have the Last Discharge feature.
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Consumed ah is the amount at that exact time you look at it. The last discharge will reset after charged back to 100%, and last discharge value charge, with the new discharge cycle. You will always have the ability to see the last discharge cycle, and all cycles will add up to cumulative ah draw.
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It means the shunt has met all parameters set, to re sync 3 times in its total life. Hence 3 synchronisation to 100% fully charged. I know this will grow you off looking at the number of total charge cycles, (0). These are calculated different from empty to full. Since you partially cycled (not the hole capacity), these partial cycles will add up to a full cycle or more later.
Another think that influences the synchronisation number, is the conservative settings that triggers the re sync. If you keep clocking synchronisations, and cycle numbers don’t increase, it means it had synchronised prematurely, without actually achieving full charge. The cycle count looks at the ah in and ah out to determine a cycle. The synchronisation is triggered by various settings user input values.
Another think that influences the synchronisation number, is the conservative settings that triggers the re sync. If you keep clocking synchronisations, and cycle numbers don’t increase, it means it had synchronised prematurely, without actually achieving full charge. The cycle count looks at the ah in and ah out to determine a cycle. The synchronisation is triggered by various settings user input values.
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irnbru
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How can this be? I was showing 100% state of charge and consumed AH 0.00 last night at 6pm. I plugged in EHU and the battery went up to something like 14.55 I think it was. This morning its still on EHU but I've dropped a percent and used 1.8 AH. Where did these go?
Its as if its not using the EHU anymore.
I thought you may be interested in the helpful reply that I received from my lithium supplier:
"Have a quick look at this voltage chart I have attached below and if you look at your voltage of 13.3 @88% that looks about right, as 13.3 volts on our equivalent chart is 90% so looks pretty good to me but hopefully this chart will make sense, which is why we made it as it can be confusing.
Also that shows your last total discharge but does not show anything you put in by solar or engine etc.
And if Im right your percentage does not come down evenly as it is a voltage based calculation if that makes sense I don't think it divides down into exact equal parts, your voltages max and min look healthy too."
PS: I hope I'm not poaching this thread!
"Have a quick look at this voltage chart I have attached below and if you look at your voltage of 13.3 @88% that looks about right, as 13.3 volts on our equivalent chart is 90% so looks pretty good to me but hopefully this chart will make sense, which is why we made it as it can be confusing.
Also that shows your last total discharge but does not show anything you put in by solar or engine etc.
And if Im right your percentage does not come down evenly as it is a voltage based calculation if that makes sense I don't think it divides down into exact equal parts, your voltages max and min look healthy too."
PS: I hope I'm not poaching this thread!
Lenny HB
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It's you.
Look at my post #68.
If it is 160ah 1.8ah represents1.1% as I showed you in post #68 your percentage reading was about 4% out at 72% SOC.
So with 1.8ah used and showing 99% it's spot on.
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Lenny HB
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She has a Gel battery Lithium voltages are totally different for SOC charg,e also voltage is only a rough approximation of SOC, far better to go by amp hours used.
Yes, I am sorry, the OP’s last post crossed with mine. I posted my response after @Raul’s post. I’ll start a new thread if necessary to avoid confusion. Sorry OP!
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OP
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irnbru
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Thanks but why I have I lost a percent when it’s on eHu ?It's you.
Look at my post #68.
You still haven't told us what size battery you have so I'm still assuming 80ah is this correct?
If it is 80ah 1.8ah represents 2.2% as I showed you in post #68 your percentage reading was about 4% out at 72% SOC.
So with 1.8ah used and showing 99% it's only 1% out, not much wrong with that.
Lenny HB
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I've edited post #83 so it's correct now.
Lenny HB
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It shows you have used 1.8 amps so the percentage is correct.
Your charger is in float mode so only supplying about 1 amp and the amount of power you have used is not enough to trigger the charger into charging mode.
Also your float charge voltage of 13.24v is to low for Gels it should be 13.6 to 13.8v, you might want to check your charger settings.
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irnbru
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Thanks for all the help, Is this the Victron settings as the solar controller is only a slider button and it’s at gel.
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