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Old 06-29-2020, 10:14 PM   #1
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Converter troubles

I own a 2009 Flagstaff Shamrock 23RS. I need an “experts” opinion for my situation. I use one size 27 deep cycle battery. While camping last week at a full service campground I had my 30A cord plugged into the electrical post. It was cool so no need to use our air conditioning but we did use an electric space heater overnight each night (5 night stay) and a hair dryer each day with no issues. The third day the lights were getting dimmer (a sign that the converter is failing) so I plugged my Schumacher charger into the 15 amp receptacle at the power post and began to recharge the battery (which was now at 8%). So supposedly I was charging the battery with both my charger and the converter with its 30A supply (which my knowledgeable son said later is a bad idea). It seemed the converter was just not charging the battery but I still had power for the space heater and the hair dryer plus other plugs to charge iPads and phones. I discovered I had blown a 40A fuse - which my manual says should be 30A. I replaced the fuse with one which is 30A. I didn’t charge the battery with my charger again unless I used the battery disconnect. Next time I tested the battery it was down to 20% so I concluded the 12V circuits were running off battery power. When I tried the air conditioner it would not come on but all my 110V plugs were working. So my questions are: 1. Does this mean my converter needs replacing? 2. Could my 30A power cord be faulty? 3. Is it possible that I was not getting 30A from the power supply? This was at a very good campground so #3 is unlikely. 4. Any other “expert” opinion. Thanks for your help.
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Old 06-30-2020, 05:22 AM   #2
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Its not your 30 amp electric at all. If the microwave works, the 120 volt system works. A 30 amp system is as simple as that.
Your space heater and hairdryer are 120 volts only and don't need the converter.
Your AC is 120 volts but needs 12 volts to operate the thermostat. Same with the fridge, if gas/electric.

On to your converter/charger.

Its ok to have 2 and 3 chargers on one battery. Folks with solar, engine charging, and the generator running do it all of the time. All charging is regulated by voltage to not overcharge your battery.

First, some converters are plugged in and may be plugged into a GFCI circuit. Check for thr plug out and then all of the outlets for a test reset button. Do this while plugged into shore power. They don't reset without power to them.

Second, many converters have 2 fuses in them. They are called reverse polarity fuses. They blow if you connected the battery backwards, even for a second.

Sounds like a $10 volt meter for testing is in order. You probe the battery cable connections to see if you have 13.4 volts at the battery when on shore power. 12.6 when not.
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