AGM battery charge from vehicle

Talk to the people at ARRID they make a thing called the "Twin Charge" and I think they have a model that suits AGM batteries.

I have one in my van and it manages the charge to the Sealed Lead Acid.

If you get one make sure you actually talk to the makers because there are slight differences in the charge rates and voltages depending on your battery type apparently.

I'd be looking further for the cause of failure Waldo

You won't cook battery that way, unless something else wrong, or you have let it go flat lots of times.

The battery will charge by direct parallel connection to car , but this charge is
lot less than can be done with right set up.

Robin Miller

Try This


Redarc Battery isolator

Peter

Hey Waddo,
Last time I checked you could purchase an Appollo Yuasa 96 amp hour battery from Appollo Batteries at Seven Hills NSW for $165.00 , I have had one for the last three years and has performed faultlessly. Don't be ripped off by battery shops!

Hi Andrew,

I would also like to know why it failed.

9 volts is not unheard of for an AGM to come back to life. They are designed for this. 300 cycles at that sort of voltage.

Sounds like a crook battery.

Read PostID: 32370

I do a 'Van Kit' to charge batteries in the van.

Regards Derek.

Waddo.
Where abouts in Vic are you? I would like to see the battery and test it. Eric

"Have to admit I have discharged it fully a few times (ignorance!)"

It depends on on what you mean by "discharging it fully"

Discharging 100% of batteries capacity (0% remaining ) means stopping discharge when the voltage drops to 10.8 volts WHILE IT IS DRAWING 5 AMPS. The voltage will recover to a higher level once you stop discharging.
AGMs which have been 100% discharged should still survive a 100 cycles.

It sounds like what you've been doing is over-discharging it and possibly causing voltage reversal on some cells.

A better Isolator or charger won't help - what you need is a low-voltage cutout.

Andrew

"Also , is it possible (or safe) to charge an AGM from the car battery when running (understand the need for Anderson plugs, contact breakers, correct wiring etc). How can I stop cooking the AGM battery in the van when using output from car alternator"

The only problem you will have cooking an AGM is if it's mounted in the Engine Compartment. They are more prone to this than wetcell or Gel.

If mounted in a Trailer, undercharging will be the only problem, but easily fixed by using wire of adequate thickness (which depends on what other loads will be running). AGM's are much easier to charge at low voltage compared with Wetcell Deepcycles. You can fully charge an AGM from 13.8 volts in 4 hours.

If you get a Cat battery you will get a 5 year warranty on it for a 4WD. The purchase price for my LC Troopy was $175 from a cat dealer. It is replaceable for failure for the first 2 years and then the warranty covers 80%, 60% and 40% for the next 3 years. I purchased it fom a Cat dealer 2 months ago. They are designed with built in strengthening in th eplates that is designed to put up with massive vibration. A must for anyone doing a lot of off road and corrugated roads.

*Please note that this is not a deep cycle battery.

Is there such a device that would do a 3 stage charge to the house battery if it was connect after the dual battery solonoid. The crank battery would get everything it needed from the alternator then once the redarc (example) connect both batteries then the house battery would start a 3 stage charge. Would this work ?

Lorne.........