Inverter converter RV

Mes batteries étant à plat, je pose la question sur camping québec de la recharge et du fonctionnement en général du convertisseur / onduleur.

Un forum américain aborde la question ici. Extrait:

 Let’s start with one basic: The « inverter » in your coach is actually TWO devices in one, the first is the inverter and the second is known as a converter. The inverter takes 12 volt power from the house batteries and changes it into 120 volts AC which you can use to power your microwave, your TV, etc. The second part is a « converter », which is a fancy name for a battery CHARGER. This device takes 120 volt AC and changes it into 12 volt DC to charge the batteries back up. When you manually shut down the inverter, the charger is still on, unless you turn off the charger.

Now, consider this, leaving your motorhome unplugged for 18 hours will generally cause your batteries to run down if you have your inverter turned on. This is to be expected and is not unusual. If you are going to leave the coach unplugged for that long, you should shut your inverter off and also any other appliances or devices that might discharge the batteries. That would include your refrigerator, your water heater, your lights etc. Basically anything that uses electricity can cause your batteries to discharge in that period of time. A motorhome is not like an automobile which can be left for days or weeks without discharging the battery.

However, if you have the coach plugged in, or are driving it, you can leave the inverter on all the time. This proceedure makes living in your motorhome more convenient since you can now watch TV or use the microwave. I leave mine on just so I don’t have to reset the clock on the microwave. If you are letting the coach set for more than a day without plugging it in, then shut down all your electrical devices to avoid discharging the batteries.

Don’t concern yourself with comments about an air conditioner. Your inverter is wired in a way that it doesn’t power the A/C anyway. 

I would go a step further to explain something that I beleive confuses people. Your coach lights, water pump, gas water heater and the gas side of your refrigerator all run on 12 volts supplied by your four coach batteries. This makes your coach liveable when you don’t have shore power or the generator running. Some people believe that when you’re plugged in or running the generator that your converter is converting 120 volts to 12 volts. In a sense it is, but it is doing it by charging the batteries as you discharge them by running lights and other things. The batteries act as a large safety buffer for all your 12 volt needs.

Your coach should have a Magnum Inverter. When you leave it on while the coach is unplugged and nothing is being used, it goes into sleep mode, but still uses energy. The microwave clock is is 120 volts A/C and requires the inverter to draw power to operate it. Other things such as night lights, clocks or anything else you have plugged into an outlet will draw power.

My personal opinion……I only turn on my inverter when I need it. Others use it as uninterrupted power. I want to know when my power is interrupted so I can find out why. Not a huge issue, just a personal preference. I also rarely use the inverter to power my microwave. I think it shortens the life of the microwave, especially the Sharp Convection models. Listen to the microwave start up some time when it’s on the inverter.

Big inverters can draw as much as 4A in « idle » mode (no other 110V appliances turned on), and it goes way up from there. If you don’t need it, don’t use it. 

When on generator or shorepower or while driving the rig, leave the inverter on. It will provide backup 120V power to save your clock and recording settings when the shore power or generator power is disconnected.


Quant à ma question particulière à savoir pourquoi les batteries ont-elles été drainées quand je me suis sur le 115VAC avec le convertisseur à OFF. Un élément de réponse. Extrait:

I do not own a prosine2500, but looking up the spec’s on it, it appears to be an inverter/charger. If this is the only means of charging the house batteries then I think it would be unwise to turn off the unit, as this would mean that the house batteries would lose their charge while hooked up to shore power.

Le contraire ici: I always turn my inverter off when on shore power. If you are away from the coach and there is a power failure, and you have the system set to invert, then you may have some severly drained batteries when you return. That « built in transfer switch » that Brett mentioned will engage when shore power is lost.


Au sujet de mon convertisseur en particulier, un Heart Interface Freedom 20D (manuel: Freedom series 1), lu ici:

If I’m not mistaken, the 20d has an automatic transfer switch that shuts off the inverter when on shore power. Maybe staying on causing a feed back loop??


Je m’aperçois par la suite qu’il n’y avait pas de courant 115VAC maison ! (le breaker de la remise était fermé). Donc le motorisé sans courant depuis plusieurs jours, cela peut peut-être expliquer la décharge. Ceci dit, grenou me fait comprendre qu’il existe des disconnect switches (en ai-je?) et qu’il est bien de déconnecter les batteries quand pas utilisées pour une longue période. Voir cette discussion sur un forum qui traite de la bonne procédure pour déconnecter ses batteries (négatif d’abord, positif puis commencer le rebranchement avec positif et finir par négatif).

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