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Old 07-03-2013, 12:33 PM   #29
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The only way to disable and isolate the charging circuit in your inverter/charger is to throw the circuit breaker that provides it with 120VDC. It should be marked in your breaker box.
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Old 07-03-2013, 12:51 PM   #30
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The only way to disable and isolate the charging circuit in your inverter/charger is to throw the circuit breaker that provides it with 120VDC. It should be marked in your breaker box.
You saying the manual is wrong? And what "120VDC" are you talking about?
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Old 07-03-2013, 01:37 PM   #31
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I think Lew had a typo. I believe he meant 120 Volts A/C. I'm assuming that your air conditioner is a standard alternating current type, run off of a generator that produces DC to charge your batteries and AC to run your air conditioner.

On my last trailer, I was disappointed to discover that a 2400 watt generator was not large enough to run my 11,500 BTU air conditioner. The problem wasn't the running amps, but was the amount of extra current required to get the compressor running. While normally operating, I recall about 12-14 amps, but it shot up to 22-24 amps to start the compressor. This caused the generator to kick off on overload. It was this experience that made me think you may have an undercurrent condition in the 120V ac circuit.

I was able to measure voltage and current with a Kill-A-Watt unit. Not sure if yours is tied directly to the generator or not. If it has a plug, you can do the same.
If it is hard wired, an alternate quick test would be to connect a digital multimeter or plug in a Kill-A-Watt into one of your 110 plugs. Then watch the voltage when the air conditioner comes on. If it drops below 108, you most likely have a problem.

Caveat: I am not an electrician or a certified tech. I echo Lewster's advice to have it professionally checked.

Good luck.
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Old 07-03-2013, 02:17 PM   #32
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Got it figured out! After reading all your inputs (thank you everyone), I remembered reading something about charging options in the Tripp-Lite manual (yeah, when all else fails, RTFM ). There are 2 sets of dip switches on the inverter under the bench seat. The "Group B" dip switches B1 and B2 sets charging options. There are 4 options as follows: Most Limiting, Less Limiting, Least Limiting, and No Limiting. Mine was pre set by either the factory or the dealer to "No Limiting", which sends the gen power to charge the batteries at any load size (shuts down all AC appliances). I first reset it to Least Limiting, which ran the A/C, but shut down as soon as I started to recline the bench seat. So I now have it set to Less Limiting and it works like it should! The A/C stayed on with both TVs and the water pump running so this should be good. If not, I may try setting it to Most Limiting in the future. Let me know what your settings are at. Thanks!
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Old 07-03-2013, 02:57 PM   #33
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Got it figured out! After reading all your inputs (thank you everyone), I remembered reading something about charging options in the Tripp-Lite manual (yeah, when all else fails, RTFM ). There are 2 sets of dip switches on the inverter under the bench seat. The "Group B" dip switches B1 and B2 sets charging options. There are 4 options as follows: Most Limiting, Less Limiting, Least Limiting, and No Limiting. Mine was pre set by either the factory or the dealer to "No Limiting", which sends the gen power to charge the batteries at any load size (shuts down all AC appliances). I first reset it to Least Limiting, which ran the A/C, but shut down as soon as I started to recline the bench seat. So I now have it set to Less Limiting and it works like it should! The A/C stayed on with both TVs and the water pump running so this should be good. If not, I may try setting it to Most Limiting in the future. Let me know what your settings are at. Thanks!
David
Here are relevant pages of the manual (I hope I attached it correctly).
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Old 07-03-2013, 03:04 PM   #34
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Should have thought of the DIP switches Glad you got it figured out. BTW, the manual is available as PDF on the Tripp-Lite website.
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Old 07-03-2013, 03:09 PM   #35
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Should have thought of the DIP switches Glad you got it figured out. BTW, the manual is available as PDF on the Tripp-Lite website.
Yeah, I never thought that the dip switches would have been set that way as a default. I'm really curious if this was jquayle's problem.
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Old 07-03-2013, 04:42 PM   #36
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The only way to disable and isolate the charging circuit in your inverter/charger is to throw the circuit breaker that provides it with 120VDC. It should be marked in your breaker box.
NOPE! That's exactly what I meant. When inverter/chargers are properly installed, they have a dedicated circuit breaker on the input line from the breaker box. On larger coaches with auxiliary circuit breaker boxes dedicated to the 'inverter circuits', there is also a 30 amp output circuit breaker in the auxiliary box. If you want to isolate the inverter/charger from your circuits, you simply throw the inverter's input circuit breaker. No power to the unit, no draw from the charger circuit.

If you don't have one of these, then what is protecting the circuit feeding 120VAC into the inverter/charger?
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Old 07-03-2013, 05:05 PM   #37
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It definitely could be as that is what we changed on mine last summer and it seems to have fixed the problem.

FWIW my compressor start current is ~ 32 amps.
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Old 07-03-2013, 05:18 PM   #38
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It definitely could be as that is what we changed on mine last summer and it seems to have fixed the problem.

FWIW my compressor start current is ~ 32 amps.
Do you remember which charging option you changed it to?
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Old 07-03-2013, 11:17 PM   #39
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Thanks Wayne. I'll try testing it with the inverter switch in the off position, but that 3 position switch is under the rear seat (not on the remote panel). I leave the rear seat in the bed position with a mattress topper, so it would be a real PITA to switch the inverter off every time I needed to use the a/c. I'm pretty sure the switch position is not the problem because I tested the a/c while plugged in to 20 amp shore power last night for a couple hours and it worked as it should. The system drew 17 amps when in this configuration. I can't imagine the charge controller acting differently when running on generator vs shore power, or would it?
mine is in that same config 90% if the time! The memory foam mattress makes it fun trying to crawl under there and access the panel.

Just wanted to say I have the same experience. AC runs fine off shore power. (20 amp, not on a 30 amp circuit)
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Old 07-04-2013, 01:01 AM   #40
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Originally Posted by jquayle View Post

mine is in that same config 90% if the time! The memory foam mattress makes it fun trying to crawl under there and access the panel.

Just wanted to say I have the same experience. AC runs fine off shore power. (20 amp, not on a 30 amp circuit)
Check your dip switch settings and let me know if it fixes your problem. It worked for me
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Old 07-04-2013, 11:43 AM   #41
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Check your dip switch settings and let me know if it fixes your problem. It worked for me
Can you post a picture of your final dip switch settings?
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Old 07-04-2013, 01:01 PM   #42
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Originally Posted by lewster
The only way to disable and isolate the charging circuit in your inverter/charger is to throw the circuit breaker that provides it with 120VDC. It should be marked in your breaker box.

NOPE! That's exactly what I meant. When inverter/chargers are properly installed, they have a dedicated circuit breaker on the input line from the breaker box. On larger coaches with auxiliary circuit breaker boxes dedicated to the 'inverter circuits', there is also a 30 amp output circuit breaker in the auxiliary box. If you want to isolate the inverter/charger from your circuits, you simply throw the inverter's input circuit breaker. No power to the unit, no draw from the charger circuit.

If you don't have one of these, then what is protecting the circuit feeding 120VAC into the inverter/charger?[/QUOTE]

lewster,

I don't want to start an unproductive argument here but I rely on this forum to further my understanding of the Interstate and its systems. I'm a little confused by your post(s), maybe you can straighten me out.

The post you quoted (and then verified as being "exactly what you meant" says:
"The only way to disable and isolate the charging circuit in your inverter/charger is to throw the circuit breaker that provides it with 120VDC."

Help me understand a couple of things here:
First, "The only way to disable and isolate the charging circuit in your inverter/charger is to throw the circuit breaker........"




The Tripp-Lite manual seems to clearly state, in multiple places, that the charging circuits are inactive with the Mode Switch (on the unit itself, not the remote panel) in the DC OFF position. Here's what the manual says:
  • Page 3; "The "DC OFF" setting de-energizes the unit and connects AC OUT to AC IN. See Operation section for setting instructions."



  • Page 4; "DC OFF: Switch to this mode to prevent the inverter from drawing power from the batteries."
Again, are you saying the Tripp-Lite manual is wrong??

Second, the last part of your sentence says; "......that provides it with 120VDC."

I'm pretty sure that 120V DC exists nowhere in the Interstate.

Thanks for any enlightenment you can offer.

Wayne
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