Bruce Bernhart RV Topics


Bruce Bernhart RV Topics
Original articles plus the "best of the web" on RV care and maintenance by RV writer and enthusiast Bruce Bernhart

Updated June 30, 2013

Power Inversion/Conversion

In Minnesota, Bruce Bernhart has been an RV enthusiast since the 1980's

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Camping Bear

Look for other Bruce Bernhart RV care and maintenance topics on Articlesbase and Ezinearticles and the Bruce Bernhart Blogs

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RV Power Conversion (Not to be confused with power INversion)-

RV Converters, actually have a very simple task (supplying 12 volt power to lights, pumps and fans), but because their basic function is shrouded with fuses, and circuit breakers, converters appear to be more formidable than they actually are. Most RV converters are composed of the following parts:

  • Battery substitution power supply, and relay.
  • D.C. Fuses
  • AC circuit breakers

1. Battery substitution power supply. Chew on this description for awhile "Battery Substitution?" "Power Supply?" Yep! That's all that it is, a humming transformer that reduces 120 volts AC down to 12 Volts, and a couple of Diodes, to convert the 12 volts AC to 12 volts DC. When the converter is connected to shore power, is makes it own 12 volts DC to a limit of about 30 amps of power, and your rig's coach battery is switched out of the circuit by a relay. But, what about the fuses?

2. The converter box is a handy place to hang all of the 12 volt DC fuses.

3. And it's also a handy place to hang all of the AC circuit breakers (one of which is used to switch the converter AC inlet power on and off).

The relay only operates when you plug your rig into shore power. The relay closes off your house battery and allows the battery substitution unit to power everything in the coach. When the rig is disconnected from shore power the relay clicks back to a different set of contact points, and your rig will then be operating off of your house battery once again. Shore power is transformer power, house power is battery power, as far as your lights, heater, and pumps are concerned.

Battery charging occurs because the converter manufacturer, installed a "Bleeder Resistor", which acts like a trickle-down reducer valve, between the converter-to-house power connection (the one that feeds all of the DC fuses in the face of your converter box), and the battery connector, located right before the relay. When the converter is humming away on shore power, the bleed resistor allows a small fraction of the converter's 30 amp potential to be siphoned off to "keep the house battery charged". Most converters only allow three to five amperes to "bleed" through to feed the house battery. This is a primary reason that attempts to recharge a flat house battery using an on board generator, fail miserably. Flat batteries require a minimum of thirty to forty amperes of power to recharge quickly. A three amp charge rate would take forever (and it usually does - most people give up after three or four futile hours of running a thirsty generator to recharge a flat battery). 

Thank you for visiting the Bruce Bernhart RV Websites!

Bruce Bernhart RV Websites

Check out the other Bruce Bernhart RV Websites and Blogs:

Solar power for your RV

The care and feeding of your RV battery

The sport of "geocaching" and RV refrigeration basics

The basics of RV power inversion

RV travel tips and tire care

Advanced discussion on power inversion

Tips on buying a house battery and cold weather maintenance

RV insurance basics

Buying the right generator for your RV and portable power

RV television reception options

Care and maintenance of the RV air conditioner

Top RV destinations

RV long-term supplies and weight considerations

RV insurance- Road protection and bodily injury coverage

RV battery types and winter charging considerations

Deep cycle battery basics

Bruce Bernhart RV Websites

Also, be sure to check out the Bruce Bernhart Mandolin Websites:

Bruce Bernhart mandolin rock tabs

Bruce Bernhart mandolin lessons- common scales

Bruce Bernhart on buying and setting up your new mandolin

Bruce Bernhart mandolin lessons- tuning

Bruce Bernhart mandolin lessons- chord patterns

Bruce Bernhart on mandolin history and basic chord structures

Bruce Bernhart on string and saddle adjustment

Bruce Bernhart more tuning tips and whole/half steps

Bruce Bernhart on more chord patterns

Bruce Bernhart on the mandolin family

Bruce Bernhart on mandolin bluegrass chords and patterns

Bruce Bernhart on temperature considerations

Bruce Bernhart lessson on mandolin flats and sharps

Bruce Bernhart lesson on scales, circle of 5ths and meter

Bruce Bernhart on triads, gears

Bruce Bernhart mandolin chord diagrams

Bruce Bernhart on modern emergence of the mandolin

Bruce Bernhart on simple chords

Bruce Bernhart on whole and half-note steps on the mandolin

Bruce Bernhart mandolin practice excercises

Bruce Bernhart on playing waltzes

Bruce Bernhart on majors, minors and sevenths

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