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Open Roads Forum  >  General RVing Issues

 > Shore power and inverter on together?

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georgelesley

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Posted: 05/16/18 06:49pm Link  |  Quote  |  Print  |  Notify Moderator

We just had a few quick in succession brief power outages where we are parked. It caused the tv and sat to go out and have to reset each time. It got me to wondering if putting on the inverter with shore power plugged in would act as a backup power since the TV and sat both run on inverter powered outlets?

It seems to me that when the shore power goes out the transfer switch would allow the inverter to keep the power flowing from the inverter. Right or wrong?


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Lwiddis

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Posted: 05/16/18 06:53pm Link  |  Quote  |  Print  |  Notify Moderator

If you are experiencing shore power issues DISCONNECT!

You received a warning with apparently no damage. Don’t push it.


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DrewE

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Posted: 05/16/18 07:05pm Link  |  Quote  |  Print  |  Notify Moderator

Maybe, maybe not, depending on how quick the transfer switch is and how sensitive the equipment is to blips.

One reasonable solution is to have a smallish inverter to run the TV and satellite receiver on and only use that. When you have shore power, the converter (or charger part of the inverter) will have no trouble keeping up with the DC load of the small inverter and then some. A 150W - 300W inverter should be plenty for these devices unless you have some pretty unusual TV (such as an old CRT projection unit or plasma screen).





MrWizard

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Posted: 05/16/18 08:05pm Link  |  Quote  |  Print  |  Notify Moderator

is this a whole RV inverter, or just a few circuits ?

is it a stand alone inverter ?

or inverter charger combo with built in pass thru power transfer switch ?

i ran a dedicated circuit for TV/PC etc.. from a stand alone inverter for many years

and it worked great, because there was NO transfer switch and NO drop out

generator or shore keep the batteries charged, with more power than what the TV needed

many people leave leave their combo inverter-chargers with the invert switch set 'ON', so that if shore power drops out, the inverter keeps things powered

but power up and lag time depend on the inverter, some are seamless, some are not

IF you have whole house 'large' inverter, then you must switch fridge propane full time, and the turn off electric for the water heater

if power drops out, for some hours, and the inverter is running the high draw items, you will end up with dead batteries


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2oldman

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Posted: 05/16/18 08:13pm Link  |  Quote  |  Print  |  Notify Moderator

DrewE wrote:

Maybe, maybe not, depending on how quick the transfer switch is and how sensitive the equipment is to blips.One reasonable solution is to have a smallish inverter to run the TV and satellite receiver on and only use that
x2. That's what I did.

pianotuna

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Posted: 05/16/18 10:39pm Link  |  Quote  |  Print  |  Notify Moderator

A small inverter for the RV will do what you wish. So would a hybrid inverter/charger, but at a much higher cost.


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Posted: 05/17/18 06:20am Link  |  Quote  |  Print  |  Notify Moderator

pianotuna wrote:

A small inverter for the RV will do what you wish. So would a hybrid inverter/charger, but at a much higher cost.


So would a properly sized UPS (uninterruptible power supply/filter).
I do that at home even.


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georgelesley

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Posted: 05/17/18 07:55am Link  |  Quote  |  Print  |  Notify Moderator

We use a surge protector at the power pole so I was not greatly concerned about power off surges. It is a wired by factory inverter that powers some outlets, nothing high draw.

wa8yxm

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Posted: 05/17/18 08:43am Link  |  Quote  |  Print  |  Notify Moderator

There are two types of inverters for this post.
In-line INverter/chargers adn
Stand alone
Stand alone for TV you can leave them on if you wish, The Converter will keep the batteries up.

In line inverter/chargers will switch to "Standby" when shore power is present so leave 'em on

You may have heard of a device called a UPS (it is not by the way) for Computers.. This is an INLINE type Inverter/converter with a battery inside.

(A true ups consists of 3 modules. A converter. a battery and an INVERTER in series. teh ones you buy at MicroWorld do break power (intrupt) for like 1/60th second or so as whey switch over they are IPS units not UPS but that's technical and you don't need to know that)

FOr many years my TV did not even blink when shore power vanished thanks to my Prosine switching in fast enough .


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travelnutz

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Posted: 05/17/18 08:48am Link  |  Quote  |  Print  |  Notify Moderator

Never allow 110 AC to back feed an inverter thru the inverter 110 AC outlets as all I've seen will smoke for a second if it even takes that long and then you'll get to but a new inverter. Only happened to me once before I learned the hard way.

After that bad experience back in the very early 1990's. When we got back home I went to an electrical supply place locally and bought 3 little enclosed in clear plastic 10 amp DPDT (Double Pole Double Throw) relays having 6 little connections lugs that are roughly 1" wide, 1-1/2" long, and about 3/4" thick in size. They can vary in enclosed plastic case size and/or amp capacity as needed or wanted but all do the same task. It's just an auto switching relay and not expensive. Mine cost $10.50 each and have purchased 4 more recently also for other things/uses. The joys of being a retired engineer!

Also a blue shallow electrical box, a standard duplex outlet receptacle, and a plastic 2 outlet receptacle cover to enclose the outlet box, also very cheap at around $3 total. Mount the new box and covered outlet in a hidden location like inside a cabinet or behind a removable access cover or as I do, right next to or near an OEM outlet clearly labeled "110 AC shorepower/inverter ____ amp only"

I use a simple off the shelf 10 amp mini fuse wired on the shore power hot side incoming black wire as the OEM circuit is 15 amp min. After the fuse the wire goes to the relay's solenoid activation lug so the shore power is only going thru to the duplex outlet when the shore power has current because the solenoid had moved the contacts to the shorepower contacts side inside the relay only. When there's no shore power, the contacts instantly move back to the inverter AC powered pass thru relay contacts.

Thus, both power sources cannot be connected at the same time and both can be safely connected to the relay at the same time. You won't even nor can you tell the relay is even there as it auto and instantly switches from shore power to inverter should the shore power fail and back when the shore power comes back on.

I also did this for the RV microwave for shore power/inverter auto switch over AC outlets. Another in the bedroom, in the bathroom vanity also and one in the kitchen slideout for laptop etc use and charging while using. Only limited by your imagination. We always have 110 AC powered outlets inside the RV anytime anywhere as needed without starting the generator and it's so quiet for making coffee and toast etc in the morning even if right next to another RV with people sleeping inside.

It's not a difficult thing to do and works great and is very reliable and so many uses.

Another way is using 3 way switches for an AC outlet. Center is off, down connects power from one source, and up connects power for a different source. Only requires a flip of the switch. isolates both inverter and shore power AC power connected until you flip the switch up or down as desired. Can all be in one square electrical standard box outlet or in separate single box outlets or just adding to an existing duplex outlet area. Must select the power source as it's not auto switching for maybe the real lazy.


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