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My fredom 25 inverter is not running the refrigerator in my motor coach when I turn the generator off or unplug from shore power.

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Is the inverter rated for more power than the refrigerator draws (watts). Does the coach 12 volt power drop (at the inverter) below 12 volts when the refrigerator comes on? If so, you may need to increase the wire size from the battery to the inverter. Make sure that the voltage doesn't drop at the battery. If so, it may need replacement or a larger capacity battery. When the battery is being charged, measure the voltage at the terminals (which are hopefully clean)--it should be 13.5 to 14.5 volts.

Posted on Sep 07, 2009

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Generator runs,no power at breakers or output plug,has been started and shutdown under load. 5.7 volts on wires coming from stator. All three wires.this is on a motor home.


have the unit checked by an authorized generator repair shop
if it was operating when shore power came back on there is every possibility that the generator or inverter has been damaged from the lack of synchronization of the sine wave

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Can't find the transfer switch, and could it go bad. Shore power and generator power works to the main panel box, but won't charge coach batteries


although it is possible to do separately most times the transfer switch is internal to the inverter , and the fact you mention that inverter is not charging batteries tells me your fault lay in the inverter all or part of it is not working , look at it carefully these have sometimes two reset breakers on there cases

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If the unit has a transfer switch that switched between generator and shore power you need to look at that since nothing is working with the unit plugged into shore power. There may also bee a few battery disconnect switches close to the batteries. In that system there should also be a few inline circuit breakers. If they have tripped they will need to be reset. To determine if they have tripped you will need to look at the circuit breaker and see if there is a small black lever hanging down. If there is, slide it back up and it will lock back into place and should restore power. Without actually seeing the coach and the power configuration it is difficult to determine exactly the problem. Hope this helps.

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Trace, no power from line one from either gen set or shore power. Have rebooted, and when I invert the coach works normal. Charge system to house and coach batts perfec


If a normal install, the shore power and generator will go through a transfer switch then to the inverter. If when inverting 120 VAC circuits are OK, then the problem must be before the inverter. I would suspect that it is the transfer switch.

Disconnect shore power, make sure generator in NOT running then take a look at the transfer switch these are in a boat or RV but either can lead to vibration problems which can lead to loosening wire connections which can lead to heating and burning. It may be something as simple as a wire coming loose. (Which could be dangerous!)
Whether or not the contacts in the relays are OK, check and/or tighten all electrical connections. It's a good idea to check and tighten all electrical connections regularly.

Some transfer switches can be repaired by replacing just the relays. Other units (like mine this year!) will need to be replaced entirely.

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I take it you metered for voltage at the shore power outlet, and at the cord end itself where it plugs into the RV, is there a buck/boost transformer..if so does it have a breaker, are there fuses at the inlet receptacle. Are all GFI outlet breakers in the RV checked for normal position?

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Heart freedom 20. As soon as shore power is applied the inverter makes a growl sound, like a stuttering switch.


STOP!!! Immediately have the shore power breakers checked by assuring both output legs have EQUAL output. If not they can either burn out the inverter solid states components or the main coach A/C, Generator transfer switch. You can usually check this with a multimeter but the shore power park managers usually have maintenance personnel to check and replace bad pedestal breakers. Does this help?

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Converting the power to genertor


You should not have to switch between battery and generator, unless you are trying to use an inverter as well. Batteries are 12vdc, typically run lighting, water pump, furnace, fridge controls. Generator powers ac, microwave, television, and anything else that plugs into a 120vac wall outlet. Inverter may also run select loads, and possibly dedicated wall outlets, but not AC, fridge, or microwave (usually).

Most RVs / Motorhomes now have automatic transfer switches that will switch between the generator, shorepower, and possibly an inverter. Your coach is made during an era of transition from manual transfer switch (in form of heavy duty electrical outlet near shore power cord) and the automatic transfer switch.

There is no specific place where a transfer switch or generator receptacle are mounted on an RV. There are no rules or regulations tha cover this as far as I know. Your RV may also have an EMS (Energy Management System) that will control the transfer switch as well. EMS panels are typically located above the refrigerator or above driver / passenger seats in overhead compartment.

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I have a motor home with a Trace inverter/charger. When the unit is connected to shore power the system will recarge the battery pack fine. When they are charged the remote meter will switch from bulk...


More than likely you may a a relay that is stuck or not energizing which should switch the charging mode over automatically. Trace back from the generator to the charging circuit for the batteries. I'm not sure where the relay (or solinoid) would be located but you can be assured it is something in the charger sensing/switching circuit.

Good Luck! Gary

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1 Answer

Non-operational in RV when Onan generator and Xantrex inverter are on


Are you still under warranty with your RV? If so, take your RV back to them and try to get this problem fixed through them. You know more about electronics than I do (LOL) however, I do believe the RV sales/repair should be taking care of this issue for you.

I on the other hand own the Majestic brand washer and dryer and I am very dissapointed with them. The washer is broken already and is only 15 months old. Ugh!

Good luck, I hope your issue is a simple fix.

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