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Affinity 550 Battery Reading


mfdaustrey
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Just back from 2 weeks away without EHU. Difficult to check energy usage but it appears that the gas used was about 0. 5kg per day.

 

We have two solar panels and thought the battery was kept well charged. It generally went from 13. 8 to about 11. 8 on the built in meter. I wasn't too concerned until I checked on this forum and found 11. 8 seems to be only 1/3 charged. Can anybody confirm this. I was thinking I needed to keep it above about 8 but this implies I should be keeping it above about 12.

What do others think?

 

Too much information and no knowledge can be a bad combination.

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Voltage %charged

 

12. 6 . ... 100

12. 5 . ... 90

12. 42 . ... 80

12. 32 . ... 70

12. 2 . ... 60

12. 06 . ... 50

11. 9 . ... 40

11. 75 . ... 30

11. 58 . ... 20

11. 31 . ... 10

10. 5 . ... 0

Graham

Unless otherwise stated all posts are my personal opinion 

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All depends on the circumstances when you measured those voltages; the 13. 8 simply indicates the battery is or had recently been in charge and is what we like to see.

 

However the 11. 8 could mean the battery is under 50% full but equally could mean a load is on it or had recently been on it and the battery actually has more capacity than you think.

Then where the meter is connected if not directly at the battery can easily mislead you due to voltage drops when the battery is in use.

Only get concerned at battery levels a couple of hours after it has been on charge or on load, and whilst it is not loaded.

 

Unfortunately, these battery tables, voltage to state of charge, are only generic, different alloying in the lead can make for different values.

Edited by JTQ
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You can a nice digital voltage display from eBay for little money. Some people then wire them in next to the analogue meter to give a good idea of the state of your battery. I fitted one in my shed where my spare battery lights up LED's from a sensor.

 

Sad but real!

Graham

Unless otherwise stated all posts are my personal opinion 

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I have the one fitted, as standard, on the Elddis Affinity 550 but have not seen any explanation of the output. I now realise it's obviously a non linear scale. 0. 8 for the last 10℅ and 0. 1 for the first 10℅. It would be nice to be given some information, I'm lucky I didn't run out of power when I thought there was plenty left!

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  • 1 month later...

We have now been a week near the New Forest off EHU.

The battery runs down from about 12. 8v every day, reaching about 9:30pm to around 12v with no TV (or 11. 8v with 4 hours of TV).

It drops to 12. 1v without any usage around 6pm.

My problem is still interpreting the built in display in the caravan. At one point, in the dark, it went up from 12 to 12. 1 after watching an hour of TV. Is there any point in using the meter? Everything is working fine and I feel I should just ignore the Meyer.

 

Can't seem to attach a file but following are my readings (date, time, reading) for the week.

 

 

10/09/2014

13:46 14. 2

19:42 12. 8

21:00 12. 2

22:00 12. 1

 

11/09/2014

07:30 12

09:00 12. 1

09:52 12. 5

10:21 12. 5

10:50 12. 8

16:30 12. 8

17:41 12. 3

18:20 12. 3

19:10 12. 2

19:40 12. 1

21:00 11. 8

22:50. 12

 

12/09/2014

07:30 12

09:25 12. 8

10:30 13

10:48 12. 7

10:48 12. 6

17:20 13

19:15 12. 5

19:45 12. 4

20:35 12. 2

20:45 12

 

13/09/2014

09:50 12. 7

10:05 12. 6

11:20 12. 8

12:15 12. 7

16:05 13. 3

18:35 12. 6

20:40 12. 1

 

14/09/2014

06:30 12

07:15 12. 5

08:35 12

08:50 12

09:10 12. 7

09:55 12. 8

19:30 12. 6

20:30 12. 2

22:50 11. 9

 

15/09/2014

07:30 11. 9

09:00 12. 1

09:30 12. 8

17:25 12. 8

19:50 12. 1

 

16/09/2014

09:15 12

10:00 12. 5

10:45 12. 8

11:25 12. 7

17:15 13. 1

18:45 12. 7

20:35 12. 1

22:35 11. 8

 

17/09/2014

06:20 11. 8

09:15 12. 5

09:40 12. 5

10:20 12. 6

14:45 13. 1

17:00 13. 1

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As said earlier, with the info available it is only the readings when the solar panel has gone to sleep, and you are not loading the system, that can mean anything to us out here.

So those values that you are reporting that seem to be at and around 12 volts, indicate the battery's capacity is at least 50% depleted. That is not a healthy condition to remain at and will be accelerating its demise.

 

This all assumes you have the kit capable of reading these voltages quite accurately.

 

Edit: read the voltage early morning before the solar panel wakes up, or you switch any power users on; that will be more "reliable" as a condition indicator.

Edited by JTQ
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