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I'm currently installing a 2nd battery in my '95 Defender and I've bought a 110aH AGM battery as it's the biggest size that will go in under the seat and I can still refit the steel cover lid. The plan is to try and keep it simple and hopefully fairly cheap by just using a 140amp VSR to connect the 2 batteries. Well, that's my current thinking plan anyways :)Quote:
Originally Posted by drivesafe
I have a 110AGM. Gr8 size for fridge and LED work lights combined. Cheers
Hi again Rob, are running an electric winch?
Yes, that is the plan.... Does that change things at all?Quote:
Originally Posted by drivesafe
For winch use, you do need to consider the type of auxiliary battery if you wish to link it to the cranking battery while winching.Quote:
Originally Posted by Robmacca
Ok folks, I am now carrying a number of different size Lead Crystal batttteries, but I will start a thread on them in the Verandah Section, over coming weekend.
Here is some very interesting info I Got from the owner of Lead Crystal Batteries today while I was picking up my first consignment of Lead Crystal Batteries.
Lead Crystal Batteries can be fully charged with alternator voltages from 13.6v to 14.8v.
Plus ( and this is the really interesting info supplied ) Lead Crystal Batteries can be SAFELY charged with up to 800% of the rated Ah.
Meaning, a 100Ah Lead Crystal Battery can be charged with an 800 amp input. This means they can take every bit of UNUSED alternator output.
That's pretty incredible!
Hell...Interesting tech.
Cheers
Hi,
Do they need/use a temperature probe/sensor at full Amps charging?
Cheers
Hi Austastar, if you were using a dedicated high current charger, then yes you would need to monitor the battery temperature.
In the typical RV setup, because you are never going to have such high charge currents available, then no.
As I have posted, I have been testing these batteries, and in one test, I was initially charging the a 70Ah Lead Crystal Battery with 53 amps at 14.0v and at no time during this charge cycle did the battery temperature rise above the ambient room temperature.
Note, most AGMs ( Optimas are one exception ) must not have a charge current greater than 20 to 35% of their rated Ah yet I achieved a charge rate starting at about 80% or 2.5 times what is safe for the best type of AGMs.
The plan was only to link them together via an H/D manual switch "if" the main battery ever goes flat & I need to start the car....Quote:
Originally Posted by drivesafe
What things do I need to consider in regards to Aux Battery Type? I'll be running an AGM Aux & I believe the AGM's don't like heavy current draws due to the possibility of damaging them - Is this correct or am I well off the mark??