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Old 02-18-2018, 07:22 PM   #1
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2019 27' International
1964 17' Bambi II
Ogden , Utah
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3 vs. 4 stage converter

We have a 25' FC which we added a 4 stage converter. We will be purchasing a 2018 25' International which we are told has a 3 stage converter. Are they similar enough or would you suggest I swap them out? Thank you.
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Old 03-24-2018, 08:02 PM   #2
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Garner, , North Carolina
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I believe in reading info on boondocker and powermax converters/chargers the difference between 3 and 4 stage is the 4th stage will after a certain time frame and no load, greater than like 2 amps, the charger will increase volts from the float 13.2 to 14.6 with no or very low amps to cause the liquid to flow. This is something short of a battery boil.

If you store your RV for long periods with charger plugged in it might be better for the batteries. Not sure what a long time is, one month or 9 months. best advise.. USE it, the rv that is.

during winter i keep my diesel truck with 2 large batteries hooked up to a small battery tender i got at harbor freight. It puts out like 14.7 volts adn drops to 13.4 it seem to increase voltage every so often as well.. I will unplug it after a month or so and let it sit for a week and then plug back in.


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Originally Posted by mcaslaon4449 View Post
We have a 25' FC which we added a 4 stage converter. We will be purchasing a 2018 25' International which we are told has a 3 stage converter. Are they similar enough or would you suggest I swap them out? Thank you.
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