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Topic: Charging batteries with the alternator (Read 217 times) previous topic - next topic
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Charging batteries with the alternator
In my '95 I was under the assumption that the generator charges the house batteries faster than the engine's alternator.

I was surprised to learn that with new Lazy Daze models the alternator is faster at charging them.

Does anyone know what year that changed?
2021 Mid Bath
Re: Charging batteries with the alternator
Reply #1 –
I suspect because the newer alternators are higher output models.
Greg & Victoria
2017 Mid-Bath  “Nocona” towing a manual 2015 Forester
Previously a 1985 TK
SKP #61264
Re: Charging batteries with the alternator
Reply #2 –
The 2022 E-450 Cutaway chassis comes standard with a 210-Amp Alternator. Optionally, you can have a 240-Amp Alternator or a Dual Alternator setup with a 240-Amp and a 157-Amp Alternator. I'd want the Dual Alternator Option. I think the alternator in our 2007 is a 135-Amp.

E450 Cutaway DRW Specs

Charles
Harvest Hosts + Boondockers Welcome #23975
Escapees SKP #138195
2007 23.5' Twin King
Re: Charging batteries with the alternator
Reply #4 –
The generator does not charge the batteries. The battery charger circuit in the converter charges the batteries when the generator is running - or connected to shorepower. Until recent models, the oem converters were weak at charging the batteries, but they are easily upgraded with any vintage of LD.

Steve
2004 FL
2013 Honda Fit
Re: Charging batteries with the alternator
Reply #5 –
It has never changed. 
What has changed is the newer 3 stage converters have higer charging currents, say 30 to 60 amps that contribute to improved generator charging efficiency, less the generator 12 volt operating and excitation current.

In my 1988 MB the chassis engine 100 amp alternator is capable of charging the house batteries faster through the 40amp house circuit than using the generator and 3 to 6 amp Magnatek 4536 converter charging circuit.  My add on 300 watt solar can charge the batteries faster than the converter.
A 100 amp alternator delivers 1200 watts.  My chassis to house circuit will allow maximum of 500 watts to the house battery.
My converter produces 540 watts(36 Amps), but only allows 75 watts to charge the battery, run the TV, and run the 3 way Refrigerator.
Rodney
1988 Mid Bath
Re: Charging batteries with the alternator
Reply #6 –
Quote from: Steve  - 
The generator does not charge the batteries. The battery charger circuit in the converter charges the batteries when the generator is running - or connected to shorepower. Until recent models, the oem converters were weak at charging the batteries, but they are easily upgraded with any vintage of LD.

Steve

I changed out the Converter years ago in my former 1995TK.
I never really paid attention to what charged quicker but the 3 stage charging allowed me to leave it plugged while stored.

4600 Series Upgrade or Replacement Power Converters
2021 Mid Bath