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Old 11-18-2018, 11:08 PM   #1
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gambling on my 12 volt system

So we are on the road spending three nights at a (casino) campground. We notice that our battery indicator (the cheapo on the generator panel) showed 2 dots of 4 last night. We only watched a little tv (12 volt), run the frig on shore power (assuming it still draws 12 volts anyway), and have the lp sensor pulling it normal 12 volts. We have only been using oil heat (120 volt), and120 volts lights..

So this am during coffee we had only one red dot , the 12 volt tv would not stay on, and the few remaining non led lights were very dim.. Figured the converter cashed out, but I can deal with that. So we continue with our plans today and got back to the coach 11 hours later but now we are at 3 red dots and the lights are bright.

I will pull the one year old batteries tomarrow when I get home (close by) to see if they are electrically damaged. Never had this problem before, so place your bets; batts, converter, the brown fuse confusion box, or what is behind the little door on the steps?

I guess I am ready to go AGM batts, ditch the waco 9855 converter, and move into a 4 stage charging system... anyone have a road map for this? Is the 9855 the sole charging entity? Does the brown fuse box play a role in charging states? And what is a charge wizard, and do I need one?

Who knows this posting may offer me some luck after leaving the casino..
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Old 11-18-2018, 11:44 PM   #2
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My converter will occasionally trip the circuit breaker that feeds it. Since all the other 120 volt devices work, and all the 12 volt devices work (off the battery), this tripped converter breaker can be hard to notice (on our Solera, only the converter and one 120 volt outlet, which we rarely use, are on that breaker).
Solar or the engine alternator will charge the house batteries with the breaker tripped; shore and generator power will not.
FYI
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Old 11-19-2018, 09:38 AM   #3
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I'm going to bet it's the switch by the door. Inverter works as it charged the batteries back up. Did you turn the main cutoff switch off and back on when you noticed the batteries where not charging?
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Old 11-19-2018, 11:38 AM   #4
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I'm going to bet it's the switch by the door. Inverter works as it charged the batteries back up. Did you turn the main cutoff switch off and back on when you noticed the batteries where not charging?



How can the Inverter charge the batteries when it takes the 12vdc from the batteries and inverts it to 120vac? Your Converter will have to take that 120vac and convert it back to 12vdc to charge the batteries. Since there are power loss in both the inversion to 120vac and conversion to 12vdc, charging the batteries will only lose power, never gain. If you have a combination Converter/Inverter it still would not work as the 12vdc is inverted to 120vac, then back to 12vdc.

When I was in high school electronics class I had to write a paper with the supporting numbers why it would or would not work to use a 12vdc motor to turn a 12vdc generator. 1971-72 is too far back to remember all the specifics but I could not prove it would work, only that it doesn't.
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Old 11-19-2018, 11:44 AM   #5
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How can the Inverter charge the batteries when it takes the 12vdc from the batteries and inverts it to 120vac? If you have a combination Converter/Inverter it still would not work as the 12vdc is inverted to 120vac, then back to 12vdc. Since there are power loss in both the inversion to 120vac and conversion to 12vdc, charging the batteries will only lose power, never gain.
Pretty sure they meant converter, not inverter. Glad we donít have to deal with a TRU (transformer rectifier unit). That would really add to the confusion.
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Old 11-19-2018, 12:41 PM   #6
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nope

Shedder, I did not do that. But when I relicate the problem at home I will. So what is the pending theory?

For the wire heads out there will replacing the 9855 converter with a four stage complete the change, or are there components else where needed to complete the upgrade?
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Old 11-19-2018, 12:48 PM   #7
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How can the Inverter charge the batteries when it takes the 12vdc from the batteries and inverts it to 120vac? Your Converter will have to take that 120vac and convert it back to 12vdc to charge the batteries. Since there are power loss in both the inversion to 120vac and conversion to 12vdc, charging the batteries will only lose power, never gain. If you have a combination Converter/Inverter it still would not work as the 12vdc is inverted to 120vac, then back to 12vdc.

When I was in high school electronics class I had to write a paper with the supporting numbers why it would or would not work to use a 12vdc motor to turn a 12vdc generator. 1971-72 is too far back to remember all the specifics but I could not prove it would work, only that it doesn't.
There are MANY inverters that also charge batteries.
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Old 11-19-2018, 01:33 PM   #8
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There are MANY inverters that also charge batteries.

I know, they have a built-in converter and will not charge the batteries unless the RV is on shore/generator power. I was just trying to point out that members need to use the correct names so they don't confuse those new to the RV world.


emm-dee is not as confused as he wants others to think.
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Old 11-19-2018, 02:06 PM   #9
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My bad wrong word shoot me sorry to all who i may have messed up.

maybe i should have said the doohickey that runs from the big black wire you plug in to the wooden post in the ground or should i say earth to be correct. it takes the electrical waves and makes the radio voltage to charge the d cell batteries under your step.

Please tune to the right radio station and it should charge the lead and water squares.
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Old 11-19-2018, 02:36 PM   #10
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Pretty soon you wonít need all these wires, weíll just hook into the campground Tesla.🙈😎
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