A8 Parts Forum  

Go Back   A8 Parts Forum > A8 D2 > D2 - Interior Electrics

D2 - Interior Electrics Airbags, Sensors, climate modules, instrument clusters, switches etc

Reply
 
Thread Tools Display Modes
  #11  
Old 25th October 2019, 10:47 PM
ainarssems ainarssems is offline
Senior Member
 
Join Date: Aug 2010
Location: Rushden, Northants
Posts: 3,799
Default

13W solar charger

__________________
Currently 8less
2011 Q7 S Line 3.0TDI, 2016 Tesla Model S 90D

8 history:
2006 A8 Sport 4.2TDI quattro SOLD,
1997 S8, reached end of life with gearbox failure
Reply With Quote
  #12  
Old 25th October 2019, 10:50 PM
ainarssems ainarssems is offline
Senior Member
 
Join Date: Aug 2010
Location: Rushden, Northants
Posts: 3,799
Default

This is what happens with mains charger on drive if you have more than 1 user and that other user drives away without spotting a cable.



__________________
Currently 8less
2011 Q7 S Line 3.0TDI, 2016 Tesla Model S 90D

8 history:
2006 A8 Sport 4.2TDI quattro SOLD,
1997 S8, reached end of life with gearbox failure
Reply With Quote
  #13  
Old 26th October 2019, 12:36 AM
spannerrash spannerrash is offline
Senior Member
 
Join Date: Dec 2016
Posts: 399
Default

So folks, looks like it could be a Yuasa Silver battery problem maybe (thanks for the info).

I have had the car aprox 3 years and have had 3 brand new Yuasa Silver batteries on it in that time. I did have a current drain issue early on in my ownership which took me 18 months to get around to fixing. I just assumed this was why I was destroying batteries. My latest one has lasted about 8 months now and will still start and run the car OK but is needing more and more frequent external charges.

I know lead acid batteries don't like to be stood with a slow discharge so I just put it down to an inevitable consequence of how I use my car.

I'm gonna replace it with a Bosch S5 013. I know I will see a significant improvement initially as a new battery will perform well (usually) for the first couple of months. I'll let you know how it goes.

On my original point. Are there any issue with connecting 2 batteries to the same car in parallel? I am itching to give it a try before I get rid of the Yuasa but certainly don't want to bugger anything up.

My gut feeling is that if we can do this to jump a car with a flat battery then I should be OK. Does it not just make two 100ah batteries into one big 200ah battery?

Or....... Is this a case of a little knowledge being a dangerous thing?
Reply With Quote
  #14  
Old 26th October 2019, 08:29 AM
Nognar Nognar is offline
Senior Member
 
Join Date: Jul 2017
Posts: 244
Default

Yuasa Silver caused me a huge amount of problems and also thought there was a problem elsewhere in the car.

Could not leave it for a few weeks without it going flat, new battery now and all those problems have gone.
__________________
--
2001 Audi A2 1.4 SE - Jaipur Red Pearl
2002 Audi D2 4.2 S8 - Ming Blue Pearl
2002 Audi D2 2.8 A8 QS - Audi Silver
--
Reply With Quote
  #15  
Old 26th October 2019, 09:06 AM
ainarssems ainarssems is offline
Senior Member
 
Join Date: Aug 2010
Location: Rushden, Northants
Posts: 3,799
Default

Quote:
On my original point. Are there any issue with connecting 2 batteries to the same car in parallel?
No issues as long as both batteries are healthy and similar. You don't want a battery on it's last legs together with a new battery. It might be OK but I would not risk bad battery dragging the good one down. Also calcium, silver, AGM batteries seem to have a bit higher voltage so paired with plain lead battery they would charge/discharge at different rates.
__________________
Currently 8less
2011 Q7 S Line 3.0TDI, 2016 Tesla Model S 90D

8 history:
2006 A8 Sport 4.2TDI quattro SOLD,
1997 S8, reached end of life with gearbox failure
Reply With Quote
  #16  
Old 26th October 2019, 09:23 AM
spannerrash spannerrash is offline
Senior Member
 
Join Date: Dec 2016
Posts: 399
Default

I'm gonna shelve the idea of hooking up two batteries and just go for a new Bosch. I'll see how that goes.

After doing some research it is clearly OK to connect batteries together in parallel as we do regularly on HGVs, electric fork truck etc but some guidelines have to be followed.

1. The batteries should be of a similar age. This is to ensure a balanced discharge rate.

2. Batteries ideally should be of the same manufacturer. Same reason as above.

3. Batteries must be of the same capacity otherwise the lower capacity one will fully charge before the higher capacity one. This will then lead it to overcharge.

4. Ideally, as a safety precaution, the link cables between the batteries should be fused. This is incase one of the batteries developes an internal short. This will then potentially draw a massive current from the good battery. This may then damage the good battery also and even worse, if the link cables heat up, could become a fire risk.

5. (The real killer for me) Once the batteries have been connected together they will establish a state of "equalisation". It is recommended to charge the batteries (whilst still connected together) from a single charge source in order to help maintain this state.

Clearly point 5 renders my win win obsolete. No point in having a system that takes twice as long to discharge but then twice as long to recharge.

I feel like I have over thought this one a little bit. Maybe I need to find something else to worry about 🤔
Reply With Quote
  #17  
Old 26th October 2019, 09:29 AM
spannerrash spannerrash is offline
Senior Member
 
Join Date: Dec 2016
Posts: 399
Default

Thanks ainarssems, you called it just slightly before I did 👍

How's the car going by the way, any progress on the gearbox?
Reply With Quote
  #18  
Old 26th October 2019, 10:17 AM
ainarssems ainarssems is offline
Senior Member
 
Join Date: Aug 2010
Location: Rushden, Northants
Posts: 3,799
Default

Quote:
Originally Posted by spannerrash View Post

How's the car going by the way, any progress on the gearbox?
No progress as I have been busy with other things. I bought a set of 16" wheels from A4 to go on it so that I can keep 19" Carlsson wheels, cats are coming off as they have £340-350 scrap value, probably take out radio, good battery, floormats, maybe some other bits then rest goes to scrapyard.


Attached Thumbnails
Click image for larger version

Name:	Capture.JPG
Views:	413
Size:	38.2 KB
ID:	22290  
__________________
Currently 8less
2011 Q7 S Line 3.0TDI, 2016 Tesla Model S 90D

8 history:
2006 A8 Sport 4.2TDI quattro SOLD,
1997 S8, reached end of life with gearbox failure
Reply With Quote
  #19  
Old 26th October 2019, 10:47 AM
MikkiJayne MikkiJayne is offline
Senior Member
 
Join Date: Jan 2012
Posts: 5,017
Default

Quote:
Originally Posted by ainarssems View Post
rest goes to scrapyard.


Have you spoken to Prestige about it? At least if they take it an AHC engine can be saved.
Reply With Quote
  #20  
Old 27th October 2019, 09:08 AM
Delboy's Avatar
Delboy Delboy is offline
Senior Member
 
Join Date: Aug 2013
Location: Lowestoft, Suffolk
Posts: 2,492
Default

At 1000 dollars probably not what most would want to spend on a battery but i love the restart idea thats built in, genius if you ask me.

https://antigravitybatteries.com/pro...tive/ag-h8-rs/
__________________
Del

Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT. The time now is 05:58 PM.


Powered by vBulletin® Version 3.8.0
Copyright ©2000 - 2024, Jelsoft Enterprises Ltd.