Power Adapter

However, the ONAN feeds a total of 6.0 kW to the two conductors of the input cable. Yes, each "side" is breakered at 40 Amps, but I "suspect" that the adapter cable splits its input two directions, also. Therefore, I believe that there should be no problem with running the second A/C from the 15 Amp capable supply.

FWIW, I am NOT an electrician but a retired electronic (radio) technician.

D C "Mac" Macdonald
Amateur Radio - K2GKK
k2gkk @ hotmail dot com
USAF and FAA, Retired
Oklahoma City, OK
"The Money Pit"
1976 ex-Palm Beach
k2gkk + hotmail dot com
www.gmcmhphotos.com/okclb

________________________________
From: Gmclist on behalf of John R.Lebetski
Sent: Monday, October 30, 2017 09:23
To: gmclist
Subject: Re: [GMCnet] Power Adapter

Keep in mind the factory GMC wiring is 14-50 which is TWO 50A legs of 125V coming in to the coach so 100A available from the post compared to 30A on
the TT-30. Big difference. (Ok for the purists most GMCs were breakered at 40A at their load center so only 80A). Running 2 rooftops on 30A is
marginal at best with OEM units as they draw 14-18A running depending on size of unit and conditions. This will cause Voltage drop which is not good
for the units.
--
John Lebetski
Woodstock, IL
77 Eleganza II

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Because I dislike RV parks, "resorts" and the like.
I prefer to boondock or national park it, so the majority of my camping is done without hookups.
With solar and propane we can stay off grid for a good long time with no need for electric hookups. The generator runs the AC's if necessary.

My worst nightmare is parked in a line 3 feet apart hooked up to 50A power while everyone runs their ACs and sits inside watching television :d
We just wanted to be as self sufficient as possible, so even when I'm plugged in the only things running are the ACs.
--
Justin Brady
http://www.thegmcrv.com/
1976 Palm Beach 455
 
Justin Brady schrieb/wrote
> With solar and propane we can stay off grid for a good long time with no need for electric hookups. The generator runs the AC's if necessary.

For me, solar, a large battery pack, and I am set for boondocking :-)

--
Best regards

Peer Oliver Schmidt
PGP Key ID: 0x83E1C2EA

'76a Eleganza II 26', VA
'73 Sequoia 23', Germany, SH
 
Peer,
How much solar and battery do you have? How did you mount your panels?

On Mon, Oct 30, 2017 at 1:01 PM, Peer Oliver Schmidt GMC <

> Justin Brady schrieb/wrote
> > With solar and propane we can stay off grid for a good long time with no
> need for electric hookups. The generator runs the AC's if necessary.
>
> For me, solar, a large battery pack, and I am set for boondocking :-)
>
> --
> Best regards
>
> Peer Oliver Schmidt
> PGP Key ID: 0x83E1C2EA
>
> '76a Eleganza II 26', VA
> '73 Sequoia 23', Germany, SH
>
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>

--

*John Phillips*
 
John Phillips schrieb/wrote
> How much solar and battery do you have? How did you mount your panels?

None, but the current plan is for 200Ah plus 2 or 3 (flex) panels, ie.
160-240Wp

--
Best regards

Peer Oliver Schmidt
the internet company
PGP Key ID: 0x83E1C2EA
 
Peer, 2-300 watts of solar is not going to be enough to run an entire electric coach. What will you do for hot water? How do you plan to cook? The
fridge alone will almost max out your solar on a good day, and drain your battery on a cloudy one.

I'm a huge proponent of solar, don't get me wrong but it has it's limits, especially on our small coaches with very limited no shaded roof area.

> John Phillips schrieb/wrote
> > How much solar and battery do you have? How did you mount your panels?
>
> None, but the current plan is for 200Ah plus 2 or 3 (flex) panels, ie.
> 160-240Wp
>
> --
> Best regards
>
> Peer Oliver Schmidt
> the internet company
> PGP Key ID: 0x83E1C2EA
>
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org

--
Justin Brady
http://www.thegmcrv.com/
1976 Palm Beach 455
 
I do not want to highjack this thread but I think you may need more like
1500 WDC with a lot of battery or 2000 WDC with a little less battery. The
problem with flex panels is they do not put out very much power, at least
the ones I have seen.
My 9KWatt home array has 315, 325 and 345-watt panels. They are all the
same footprint just got better as time went on. I would like to put 7 345
watt panels up there if I can figure a way to do it safely and not look too
bad.

It would be nice to be able to run a roof AC off of it.

> Peer, 2-300 watts of solar is not going to be enough to run an entire
> electric coach. What will you do for hot water? How do you plan to cook? The
> fridge alone will almost max out your solar on a good day, and drain your
> battery on a cloudy one.
>
> I'm a huge proponent of solar, don't get me wrong but it has it's limits,
> especially on our small coaches with very limited no shaded roof area.
>

> > John Phillips schrieb/wrote
> > > How much solar and battery do you have? How did you mount your panels?
> >
> > None, but the current plan is for 200Ah plus 2 or 3 (flex) panels, ie.
> > 160-240Wp
> >
> > --
> > Best regards
> >
> > Peer Oliver Schmidt
> > the internet company
> > PGP Key ID: 0x83E1C2EA
> >
> >
> > _______________________________________________
> > GMCnet mailing list
> > Unsubscribe or Change List Options:
> > http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>
>
> --
> Justin Brady
> http://www.thegmcrv.com/
> 1976 Palm Beach 455
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>

--

*John Phillips*
 
Justin,

I think a lot depends on how you use the coach. For us, the coach's main
usage is to provide shelter and sleeping quarters, and to be able to
have coffee/tea in the morning plus a cereal for breakfast. We do not
cook in the coach, we rarely shower in the coach. Putting all that
together made my calculation come up with the need for 100Ah battery and
a bit of solar on the roof. I doubled the battery and I am pretty sure
it will meet our needs. If not, we will find another solution. And if
everything goes downhill, we still have the generator.

--
Best regards

Peer Oliver Schmidt
the internet company
PGP Key ID: 0x83E1C2EA
 
John et al,

Re solar power and fender flares / hijacking this thread; It doesn't matter, I already figgered out that a PO changed the OEM 50 AMP
shore power cable to a 30 amp cable because they didn't want to deal with the monster thick/heavy 50 amp cable!

I like the convenience of being able to run both A/C's time to cool down the coach quickly as well as anything else at the same time
so I'll replace the 30 amp cable with a 50 amp cable.

And that's that! :-)

Regards,
Rob M.
The Pedantic Mechanic
Sydney, Australia
AUS '75 Avion - The Blue Streak TZE365V100428
USA '75 Avion - Double Trouble TZE365V100426
USA '77 Kingsley - TZE 267V100808
 
Peer,
No worries man to each their own, but I can tell you (as someone who has 215AH of battery and 200W of solar) that you're going to struggle with lack
of power if you're camping for more than a day or 2 without hookups. To some that doesn't matter, but if you plan to stay for more than a day or so
off grid with an electric fridge, coffee maker, vent fans, lights, stereo, tv etc you will not have enough power.

200 watts seems like plenty, but you will only see 200 watts at noon in the summer time( and even then it's really only 170 or so for an hour in my
experience). Realistic output mounted on the GMC is more like 75 watts average over the daylight hours. When you consider that an electric fridge is
going to pull at least 75 watts, you've only broken even and not charged your batteries. Once you factor in the draw from your inverter for your
coffee maker, your cell phone chargers, your vent fans, your water pump and your lights you have actually drained battery even though it's been
"charging" all day. So on a good day you hit dark with a 75% charge. When you wake up in the morning you're now down to 50% or less thanks to the
fridge running all night. Since you're not really charging during the day you now need to run the generator to boost the batteries so you'll make it
to night 2.

If you really want it to work you need more panels and more battery if you want to be all electric.
That's why we went away from electric. The only electric we are pulling is the vent fan, the water pump, and the LED lights. (and an inverter now and
then for TV and cell phone chargers). The fridge runs on propane so no draw there, we do cook but it's all propane so no microwave or cooktop to draw
power. Even with this arrangement if it's cloudy for a couple of days in a row we need the generator to top up.

With solar anything that is a constant draw is a problem, especially overnight.

Not trying to be dismaying, just trying to help in your planning!
--
Justin Brady
http://www.thegmcrv.com/
1976 Palm Beach 455
 
Steve and Justin,

thanks for your words and links. The Victron inverter/charger is right
now sitting in the 23' waiting to be installed.

We will see how far our planned setup is going to take us. We try to
minimize the use of 220V equipment, and for example things like the cell
phone charger are all setup to go 12-5V and not 12->220->5V - that
should help quite a bit. But Justin, as you pointed out, only time will
tell on how good my planning is. And if I do need additional power
generation on top, so be it.

Thanks again guys, your thoughts are greatly appreciated.

--
Best regards

Peer Oliver Schmidt
PGP Key ID: 0x83E1C2EA

'76a Eleganza II 26', VA
'73 Sequoia 23', Germany, SH
 
Peer,
No worries man to each their own, but I can tell you (as someone who has 215AH of battery and 200W of solar) that you're going to struggle with lack
of power if you're camping for more than a day or 2 without hookups. To some that doesn't matter, but if you plan to stay for more than a day or so
off grid with an electric fridge, coffee maker, vent fans, lights, stereo, tv etc you will not have enough power.

200 watts seems like plenty, but you will only see 200 watts at noon in the summer time( and even then it's really only 170 or so for an hour in my
experience). Realistic output mounted on the GMC is more like 75 watts average over the daylight hours. When you consider that an electric fridge is
going to pull at least 75 watts, you've only broken even and not charged your batteries. Once you factor in the draw from your inverter for your
coffee maker, your cell phone chargers, your vent fans, your water pump and your lights you have actually drained battery even though it's been
"charging" all day. So on a good day you hit dark with a 75% charge. When you wake up in the morning you're now down to 50% or less thanks to the
fridge running all night. Since you're not really charging during the day you now need to run the generator to boost the batteries so you'll make it
to night 2.

If you really want it to work you need more panels and more battery if you want to be all electric.
That's why we went away from electric. The only electric we are pulling is the vent fan, the water pump, and the LED lights. (and an inverter now and
then for TV and cell phone chargers). The fridge runs on propane so no draw there, we do cook but it's all propane so no microwave or cooktop to draw
power. Even with this arrangement if it's cloudy for a couple of days in a row we need the generator to top up.

With solar anything that is a constant draw is a problem, especially overnight.

Not trying to be dismaying, just trying to help in your planning!
--
Justin Brady
http://www.thegmcrv.com/
1976 Palm Beach 455
===============
 
Tom,

And that's THAT!

Regards,
Rob M.
The Pedantic Mechanic
Sydney, Australia
AUS '75 Avion - The Blue Streak TZE365V100428
USA '75 Avion - Double Trouble TZE365V100426
USA '77 Kingsley - TZE 267V100808


-----Original Message-----
From: Gmclist [mailto:gmclist-bounces] On Behalf Of Thomas Phipps
Sent: Saturday, November 4, 2017 11:38 AM
To: gmclist
Subject: Re: [GMCnet] Power Adapter

Good discussion on this type of device.
http://rvtravel.com/can-campground-cheater-box-really-provide-50-amps/

Tom, MS II
 
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GMCMI Fall 2026 Rally

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