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Old 07-06-2016, 02:30 PM   #1
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Would this paired with a generator charge the battery more efficiently?

Just wondering if I plugged this into the generator and hooked it directly to the battery, would it charge faster? If you do this, do you have to disconnect it from the Rv? Or can it power the Rv and be charges this way at same time?
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Old 07-06-2016, 02:35 PM   #2
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Abso-100%-lute waste of money.

The 2 or 3 stage changer inside your RV is more than adequate for the process.

Just start the genny and plug in the RV. Easy. Job done.

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Old 07-06-2016, 02:39 PM   #3
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Appears to be like a trickle charger. I don't think its for fast charging for purpose of using it as it charges. Its like hooking up a battery that isn't going to be used and you want to keep it topped off.
Others may know more.
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Old 07-06-2016, 03:05 PM   #4
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your onboard charger is probably higher amp, mine is a 35amp on my small trailer, 8 Amps is not much compared to that
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Old 07-07-2016, 07:16 AM   #5
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8 AMP charger... your down 40 amps overnight.. (furnace water pump reading light) that would take 5+ hours to recharge your battery.. Just stick with the converter in the RV.. what your looking at is little more than a trickle charger.
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Old 07-07-2016, 09:16 AM   #6
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The general rule of thumb for charging batteries as fast as you can is to use 14.4VDC with the capacity of 17-20AMPS DC current for each battery in the battery bank. This will get you to a 90% charge state in aorund three hours time or to a full 100% charge state in about twelve hours.

This DC VOLTAGE of 14.4VDC is picked by the battery manufacturers to keep the boiling out of fluids from the batteries to a minimum during the known charge period. Different battery manufactures may have a slightly different boost mode charge charge voltage. The 14.4VDC is what is used for my battery setup...

What you are showing is a TOP OFF charger one might like to hookup to a battery bank that is sitting for a long period of time...

Just my thoughts here...
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Old 07-07-2016, 09:48 AM   #7
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I like my Xantrex charger because it stays in the higher 14.4 vdc range longer than the onboard converter will. And even that voltage is lower than recommended for bulk charging by Trojan. For the T-105 batteries, Trojan recommends a 14.8 VDC bulk charge voltage (and 13.5 float / 16.2 equalize). The onboard converter never even gets close to the recommended equalize voltage, which is hard on batteries.

It's required that flooded cell batteries bubble and outgas oxygen and hydrogen while charging, because that provides a means to desulfate the lead plates, plus it mixes up the electrolyte so that it doesn't stratify (concentrated electolyte at the bottom of the battery, and a weaker solution at the top).

When charging batteries are bubbling off gasses, that's a good thing - as long as the recommended charging voltage isn't exceeded, and water levels are topped off regularly. Because my onboard charging system never reaches the recommended charging voltage, I firmly believe my T-105 battery's lifespans have been compromised, and their performance has suffered over time. In other words, I believe the onboard charger is inadequate and damages the batteries.

Check out the specification sheet for Trojan T-105 batteries:
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Old 03-13-2017, 03:56 PM   #8
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on board converter/charger

My onboard WFCO is rated at 35 amps. Would there be any value in replacing my converter with something rated at higher amperage? Would this improve the converter's ability to charge the batteries?

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