Victron bluetooth voltage accuracy? (1 Viewer)

Feb 2, 2019
1,083
2,562
Norfolk
Funster No
58,334
MH
Pilote G740C
Exp
2018
I have 2 x 90a Exide gel batteries being charged by 2 x 120w solar. They go through a Victron Mppt 100/30 & I also have a Victron smart battery sense attached.

However, there is a difference of .25w between them.

It might not seem a lot but when you're paranoid about whether your solars are working properly (just installed another 120w solar panel) and not and not wanting to ruin the batteries, .25w is a lot?
 
OP
OP
Paulypaul
Feb 2, 2019
1,083
2,562
Norfolk
Funster No
58,334
MH
Pilote G740C
Exp
2018
Thanks Lenny, I'm monitoring as you advised but haven't had consistent sun to get a good estimate. I've had 2.1a today but that still doesn't seem great. I'm going to get upbthrough the skylight tomorrow to check as you suggested. (y)
 
Dec 24, 2014
9,318
48,099
Hurstpierpoint. Mid Sussex.
Funster No
34,553
MH
Compass Navigator
Exp
Ever since lighting was by Calor gas.
It might not seem a lot but when you're paranoid about whether your solars are working properly .....
From the many regular posts from the worried well about solar and battery charging I've come to the conclusion that it's due to owners having too much information.

Never mind solar panels, Vitrons, B2B's etc. it seems to me that the simplest solution to worries about batteries and charging is Prozac.
 
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Paulypaul
Feb 2, 2019
1,083
2,562
Norfolk
Funster No
58,334
MH
Pilote G740C
Exp
2018
Could it be that the MPPT is temperature compensating based on info from the Smart Sense?

Geoff
I don't know, perhaps that's the reason? Having too much info does make me paranoid, whereas before if things stopped working I'd think "oh shit"....human nature makes me acceptbthe higher reading but you may be right about realn ime temperature fluctuation.
 
Dec 2, 2019
3,655
7,890
Amersham
Funster No
67,145
MH
van conversion
Exp
Since 2019
I have 2 x 90a Exide gel batteries being charged by 2 x 120w solar. They go through a Victron Mppt 100/30 & I also have a Victron smart battery sense attached.

However, there is a difference of .25w between them.

It might not seem a lot but when you're paranoid about whether your solars are working properly (just installed another 120w solar panel) and not and not wanting to ruin the batteries, .25w is a lot?
The .25w is either a typo , or a mistake. Batt sense reads only temp and volts, not wats. If voltage at batt sense is higher by .25v compared to the controller, that’s your voltage drop from battery post to regulator, that means cable and connections are taxing you 0,25v.
 
Oct 9, 2019
5,003
17,534
Todmorden
Funster No
65,104
MH
Van conversion
Exp
FUNSTER in a PVC
Why are you worrying about your Solar working? its winter in the UK and the sun is low, so unless you have them angled and tracking the sun, you may as well forget them until spring. Driving to the shops for an hour will put more into your batteries (assuming you have a b2b fitted) than Solar all day.
 
Dec 31, 2010
2,651
5,861
Sunny South Shields
Funster No
14,797
MH
Frankia Platin i7900
Exp
Since 2010
Not sure if you can setup a ve smart network with the smart battery sense or not but with the shunt you can and it uses the shunt voltage across the network to compensate for any voltage drop

Screenshot_2022-12-22-07-16-52-154_com.victronenergy.victronconnect.jpg

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Paulypaul
Feb 2, 2019
1,083
2,562
Norfolk
Funster No
58,334
MH
Pilote G740C
Exp
2018
It was volts I was talking about and I'm trying yo harvest as much all day sun as I can in a warmer location. Dave, I'm afraid you lost me, that's how technical I'm not :rolleyes:
 
Dec 31, 2010
2,651
5,861
Sunny South Shields
Funster No
14,797
MH
Frankia Platin i7900
Exp
Since 2010
It was volts I was talking about and I'm trying yo harvest as much all day sun as I can in a warmer location. Dave, I'm afraid you lost me, that's how technical I'm not :rolleyes:
Login into your smart sense with victron connect hit the little gear cog in the top right hand of the screen you should then see ve smart networking at the bottom of the list if it is available. Open this up and then create your own network then do the same in your mppt and join that to the network you created for the smart sense if I am right your smart sense will broadcast the voltage and temp across the network (that's how it works for a smart shunt)
 
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Paulypaul
Feb 2, 2019
1,083
2,562
Norfolk
Funster No
58,334
MH
Pilote G740C
Exp
2018
Login into your smart sense with victron connect hit the little gear cog in the top right hand of the screen you should then see ve smart networking at the bottom of the list if it is available. Open this up and then create your own network then do the same in your mppt and join that to the network you created for the smart sense if I am right your smart sense will broadcast the voltage and temp across the network (that's how it works for a smart shunt)
Thanks Dave 👍

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Apr 3, 2018
3,759
10,473
Funster No
53,151
MH
PVC
Exp
1995-2004 & 2017》
I agree with Spriddler on this... too much information is indeed counter productive and can lead to sleepness nights with worry..👍👍
 
Feb 16, 2013
19,850
52,526
uttoxeter
Funster No
24,713
MH
ambulance conversion
Exp
50 years
I'm not into all this fancy stuff but have solar and batteries similar to yours with a Chinese controller and a Chinese inverter, and they both have a digital thingy on them, and very rarely read the same, but the batteries are nearly always around 13 v even through this last cold snap have been the same for around three years now.
 
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OP
Paulypaul
Feb 2, 2019
1,083
2,562
Norfolk
Funster No
58,334
MH
Pilote G740C
Exp
2018
One last question then I'm done with this sun and energy malarky....

Do these charging settings look about right for 2 x Exide ES9000 gel batteries?
 
OP
OP
Paulypaul
Feb 2, 2019
1,083
2,562
Norfolk
Funster No
58,334
MH
Pilote G740C
Exp
2018
Doh....sorry, please

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