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Thread: Bad Converter (me thinks)

  1. #11
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    Have you called GDRV yet. It seems this is a simple fix for you with your knowledge. I would imagine they would ship one to you ASAP.

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    Quote Originally Posted by freebird View Post
    The current is typically around 2 amps.
    Interesting. When I monitor my amp meter, the converter is typically supplying 25-30 amps from overnight battery usage. If it was only getting 2 amps, it would take more than four days to recharge your typical quad six volt battery bank that was depleted by 50%. Hint: They charge much faster than that.

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    I would have to agree with @TucsonJim on this. Depleted batteries will absorb the maximum that the charger (converter) will put out. This is governed by the voltage difference between the batteries and the charger, but the response by the charger to a large voltage difference is a high amperage output. The cables between charger and batteries should be capable of the rated output of the charger.

    If you have a battery monitor (like the Victron) you can watch this happen. On my boat, I have a high output 12V alternator on my generator. When I start up the generator with a depleted house bank of batteries, the output of this alternator to the three battery bank is about 90 amps. This current steadily decreases as the battery voltage increases.

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    A basic charger is producing somewhat even wattage. As battery voltage increases amperage output decreases. A more upper end charger , and possibly an RV convertor, may have more complex circuitry that charges on a curve. It will hit the battery with a harder charge then drop to a lower amperage to bring battery to full charge.
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    Site Sponsor Jerryr's Avatar
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    Quote Originally Posted by TucsonJim View Post
    Interesting. When I monitor my amp meter, the converter is typically supplying 25-30 amps from overnight battery usage. If it was only getting 2 amps, it would take more than four days to recharge your typical quad six volt battery bank that was depleted by 50%. Hint: They charge much faster than that.

    Jim
    Jim,

    I think the 2 amps that he was seeing was on the 120 vac line INPUT to the converter. My converter normally pulls 2-3 amps (AC input) when charging the battery as displayed on my EMS.
    2.5 amps @ 120 volts is 300 watts. 25 amps @ 12 volts is also 300 watts. (P=E*I)
    Last edited by Jerryr; 04-22-2019 at 08:44 PM.
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  6. #16
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    Pulled the converter and bench tested it with an old car radio for load. Nothing! Pulled the fuses which checked out Ok and tested for voltage where the fuses plug in. Nothing! problem must be in primary circuit. No sign of burn out or bluing anywhere and no electrical smell. Would have to call this one still born. Waiting for reply from G/D
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  7. #17
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    Going back to a discussion https://www.mygrandrv.com/fo...WFCO-Converter I took the pre-emptive strike and replaced the WFCO with a Progressive. I also am almost done replacing the flimsy wall in the forward thru-storage area and added a door for easy access.Click image for larger version. 

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  8. #18
    Site Sponsor TucsonJim's Avatar
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    Quote Originally Posted by Cate&Rob View Post
    I would have to agree with @TucsonJim on this. Depleted batteries will absorb the maximum that the charger (converter) will put out. This is governed by the voltage difference between the batteries and the charger, but the response by the charger to a large voltage difference is a high amperage output. The cables between charger and batteries should be capable of the rated output of the charger.

    If you have a battery monitor (like the Victron) you can watch this happen. On my boat, I have a high output 12V alternator on my generator. When I start up the generator with a depleted house bank of batteries, the output of this alternator to the three battery bank is about 90 amps. This current steadily decreases as the battery voltage increases.

    Rob
    Rob - And Progressive Dynamics carries this warning in their FAQ page.



    Jim
    Jim and Ginnie - Tucson Arizona
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  9. #19
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    Clicked on wrong button and filled in a service request form. Didn't get a reply yet so I went back to the site and found the phone number, of course at the bottom of the page. Just hung up with them and NP, new converter is on the way. Hopefully I can get the swap done this weekend.
    09 Ram 2500 Hemi
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  10. #20
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    I wanted to wait until I got home so I could get the exact verbiage from the manual on page 82 under "Auxiliary Battery";

    "Your RV has many 12-volt DC loads. When combined, their total is more than the converter can produce. High demands for 12-volt power can be met by an auxiliary battery for limited amounts of time.The 12-volt DC electrical system is designed for usage with a Group 24 or Group 27 deep cycle battery."


    Group 27 deep cycle batteries are rated to provide 85 - 105 amps for 1 hour.

    If you count up the 12v fuses in the panel and add it up (my case 7 X 15 amps = 105 amps).

    That doesn't include the 12v breaker for the slide or charging current back to the battery. So the potential worst case load on the 12v system is over 100 amps. This is acknowledged in my manual above where it states that heavy 12v usage will exceed the 55 amp converter and the additional current will be pulled from the battery. Of course in this scenario there would be no charge current running back to the battery.

    So say I've got an 80 amp load on the system with lots of devices plugged in and all appliances running. If I'm on shore power 55 amps would come from the converter and 25 amps would come from the battery until it becomes depleted. If I'm boondocking all 80 amps is coming from the battery which of course wouldn't last much longer than 1 hour unless I have an upgraded battery setup.

    The point is the 12v system is designed to deliver more power than the converter or the battery can provide without melting wires or going on fire.

    As far as charging the battery goes it shares the available current from the converter with all other 12v appliances (including zombie loads) but will not pull more than the converter can provide and will not pull any more than the battery wants even during bulk charge.

    So you see the 55 amp converter is actually undersized and a 75 amp converter would just come closer to meeting the heavy demand that is allowed for and expected in the book.

    As far as the "Do not sue me because you don't know what you're doing" disclaimer goes.. it's just CYA.
    09 Ram 2500 Hemi
    2019 Imagine 2800BH
    My other toy is an 89 Jeep XJ with tyres ;-)

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