Charging 100amp/h agm battery

sounds like you need a pure sine wave geni, eg: yamaha, honda, kippor.

When we are not running the cars long enough for the dual battery system o put a sufficient charge into the batt, we charge our 200 amp/h battery's using honda EU20i and a 50 amp automatic charger. The charger automatically varies the rate of charge to the battery. we rotate between two batterys and each battery will be charged in under 3 hrs from dead flat.

the charger cost about $500
the geni 2k but the EU10i would do the job and save about $400 and 8kg

Pretty sure this would work well on your agm's but our batts are wet.

expensive setup but works well for us and the geni only puts out 53 dB.

hope this helps

scott

The 12V output on those generators isn't regulated. If your batteries are fairly flat it won't be a problem as it will take a few hours before they start to reach a full charge and the terminal voltage starts getting up around 14.2V. You can run it for a few hours and just keep an eye on the voltage, with your AGM's you really don't want to be sitting above 14V for a long time with a wet cell you can sit on 14.4V no problem. The other and better option is run a proper 12V charger off the 240V. I've run a switchmode 17A charger off one of those $98 gennies no problem.

Also have been researching chargers and the 25amp CTEK looks pretty good, but as asked already what chargers are the best value.

Why charge a AGM battery with a generator when you have your car's altinator's. I used to charge an AGM battery in a camper via jumper leads from the car. Hook up jumper leads, start car, disconnect positive battery termial on car's battery. An AGM battery will charge as fast as you can get current to it. Eg to about your altinater's rating. You could of course set up a much better and safer method with anderson plugs and isolators which I'm going to with our next van.
Dave

The best value 240volt-in switchmode 3-stage charger is this one for $99.
http://www.jaycar.com.au/productView.asp?ID=MB3612

It will charge up to 12 amps so it limits the initial current (Stage 1) to 1/4C for batteries larger than 50amphour.

You CAN boost-charge AGM batteries at high currents, but for long life you should limit current to 1/4C i.e less than 25 amps for a 100amphour battery.

Mike

Scott
every dealer I asked about a 3 stage charger gave me the same advice(buy a decent genny).

Brett
which brand of of 17amp charger did you run.

John
I have looked at the ctek also but they will not give me any warranty if used with my gmc generator.

Tassie dave,
I have heard of this before , but some say that a car alternator won't fully charge a deep cycle batt.
Mike
That charger Mb3612 is a dual stage, have you used it very often,what the xpurts say is that the switchmode chargers don't always fry straight but can suffer after repeated use, the voltage fluctuation keeps chipping away at the components until you get a failure.
Regards Geoff-2.

Geoff-2 ,, some how some one HAS REALLY told you a mega load of bull ,, even the cheapest brand of AGM will take at no real detriment up to 15 volts , you want to get best life and use ??? use your vehicle to recharge or if the noise is not appropiate go solar, SOME blo-dy fool has told u that an AGM is deep cycle ,NOT SO!!! ,an AGM is a totaly better battery than a deep cycle as it can be used as sutch without the bulls--t required to recharge a "wet cell " deep cycle ,,
I have 3x 80amp Fullriver AGM in my c/t and 2x same under bonnet of the cruiser ,, charged by solar./ altenator / and occaisionaly by the 2 stroke genny.