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  1. #51
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    I'm about to install Tesla batteries in mine. No other battery even comes close to them.

    Sent from my SM-G955U using Tapatalk

  2. #52
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    On a 2019 303rls, if I want to use an external charger on occasion to charger quicker or fuller, what is best practice for
    1. When 5th wheel is on shore power and using an external charger from either shore power or maybe my generator?
    2. When 5th wheel is not on shore power but using a generator and external charger.

    Thinking in terms of whether or not to disconnect one or both cables from battery to 5th wheel.

    Thanks in advance for suggestions or help.

  3. #53
    Site Sponsor
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    Quote Originally Posted by jimmyf View Post
    On a 2019 303rls, if I want to use an external charger on occasion to charger quicker or fuller, what is best practice for
    1. When 5th wheel is on shore power and using an external charger from either shore power or maybe my generator?
    2. When 5th wheel is not on shore power but using a generator and external charger.

    Thinking in terms of whether or not to disconnect one or both cables from battery to 5th wheel.

    Thanks in advance for suggestions or help.
    There’s no such thing as a “fuller” charge. When the lead sulfate is converted back to lead, hydronium and sulfate ions, the battery is charged, and nothing a charger does will do anything good beyond that point assuming the battery doesn’t need equalizing. The cheapest charger or converter there is will fully charge a battery, though cheaper ones in general require more operator awareness and intervention than the higher end chargers.

    You are going to spend a chunk of change getting a charger that can charge faster than your converter and still be safe to connect to your rig’s electrical system. Automotive style chargers often have excessively high charging voltages and make no effort at being electrically “quiet”. That means unless you know the charger is safe, it might be best to disconnect.

    Charging amps are only really useful during the earlier portion of charge time when the battery is deeply discharged. Once the battery gets some charge on it, the charger current begins to drop. The only way to force a battery to charge faster is to raise the charging voltage. WFCO chargers are set at 14.4V, which is a safe voltage for all batteries used in RVs. If you get a charger that has a mode for conventional flooded cells, you might see that voltage go up to 14.6V, which would give you a marginal charge time improvement, but I wouldn’t think it would be worthwhile.

    People tend to over complicate the idea of how battery chargers work. It’s just a DC power supply. Some have the ability to change voltage based on how much current the battery is drawing. Your converter already does that.
    John & Kathy
    2014 F250 Lariat FX4 6.2L SBCC
    2014 Reflection 303RLS
    SW Indiana

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