AGM PARRELL with acid crank ?

isolator not sure ,will have to check
fuses yes
ive got 6mm at the moment ,in the process of upgrading to 10mm

Hi Tony,

To can't crank through fuses or 6mm wire. Best to use good jumer cables.

The 10mm wire is great for the charge set up. 6mm is a bit light for the long run to the trailer.

Regards Derek.

Hi Tony & Dereck. Don't want to steal your thread but I am doing something similar with my 80 series. I have a Wet Lead acid cranking battery & a Full River AGM deep cycle battery. I have had to move the auxillary power switchboard - using Clipsal DC circuit breakers & an isolation switch - in order to fit an ARB compressor under the bonnet for future diff locks. Anyway, I use 25 square mm tie cables between the batteries so cranking off the auxillary is not a problem. What I am trying to work out are the pros & cons of standard solonoid isolators against smart ones.
Using the Redarc SB112 as an example, I gather that it will isolate the auxillary battery until the cranking battery reaches 13.6 volts and then remain energized (as long as the ignition is on) unless the cranking battery voltage goes below 12.7 volts?
Surely with an alternator output close to 14 volts, the cranking terminal voltage will very quickly reach the nominated 13.7 volts & then energize to enable charging to the auxillary battery? The only circumstance that I can envisage when this may not happen is when the cranking battery is just about stuffed. Am I correct in this thinking?

Am I better off with a non smart (dumb?) solonoid such as the Redarc SL-100 to use for dual battery starting? Or, should I be looking at something with a higher continious current rating? (SL 12-100 & SB112 both being rated at 100 amps continious & 400 amps peak)

PS, as far as I can tell, the 80 series 1HZ diesel motor is pretty basic without serious computer control, thus surge suppression maynot be such an issue? Dereck, the battery article is a good read!
Cheers Tony - VK3CAT http://www.qsl.net/vk3cat

Hi Vk,

No you are wrong. The Redarc , Sidewinder and ABR units cycle on and off as needed.

My own system in my 100 series will not charge the auxillary when the lights are on and the a/c is on.

These 'Smart' systems are better.

When using a 'Basic' on / off system you will run the auxillary down when driving in the rain, a/c on, high beam on and wipers on.

Regards Derek.

Tony

As Derek's example shows, a Voltage-sensing Solenoid does have two advantages when the demand exceeds the Alternators charging ability - when this happens the Alternator can no longer maintain its rated output - 14.0 to 14.4 volts and the lower voltage will make the solenoid open.

This means that the Auxiliary will not be discharged (even if it is only slowly) but also protects the Alternator from high loading by removing the Auxilairy Battery as load.

Mike

"the battery article is a good read! "

- I agree, this is now a very good introduction to auxiliary power. It is understandeable by anyone without needing technical kowledge.

Mike

Sandman
sometimes the best ideas are the simplest ,until next time thanks to everyone for their input .
Tony