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Old 01-14-2018, 08:24 AM   #1
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Trailer power calculator - who has done it?

There are a number of solar size charts and calculators on the Internet - this is one example.
Has anyone performed a baseline survey of their stock late model TT? While I am personally interested in a Flying Cloud FB27, almost any model will do.
Lights, furnace, fan, stereo, detectors, microwave, powered awnings, water pumps - anything and everything electrical in your unit before adding your own coffee maker, toaster, etc.
It would be nice to say the Basecamp has X total amp hours per day and the Classic 30 has Y total amp hours per day. Then we could add or subtract our own accessories to determine our personal use, then size batteries, solar panels and/or generators accordingly.
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Old 01-14-2018, 10:15 AM   #2
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Electrical Use Speadsheet

I have and still working on its refinement.

VERY surprising how each device yanks battery power that adds up. And why stock bats don’t last long boondocking.

Based on our 2005 25ft Intnl CCD SS model.
We have painstakingly (and accurately) measured every powered device individually
At the battery box and logged current drain.
AC converter disconnected.

Loose numbers from memory::

With 2 Stock Interatate 81Ah batteries ea fully charged voltage resting 3 days to 12.80v.

ie: Did you realize your Dometic fridge on gas and battery “only” draws @16.32 amps per day-.68ah. (Or 7.5a with factory door heat strip disconnected with easy switch mod.)

The “Use” Power with stock LED / switch draws 1.5 amp/day ? (Changed that led and resistor to now draw mere 1/115 of that). Stock so wasteful.

The Fantastic fans draw 1.25 - 1.57 - 1.75 amps pending speed setting ?

Range hood fan draws 1.25a

Water pump varies 1.5a to 5.5 A pending pressure when oscillating.

Furnace fan 7.5A.

YMMV Hope to complete it one day ...
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Old 01-14-2018, 11:04 AM   #3
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Here are a few more numbers for you, based on my 2017 International 27FB. These were measured by my shunt-based Victron BMV-712 battery monitor, which sees all power going into and out of the batteries.

furnace: 6.0 A

water heater: 0.6 A when running (presumably due to solenoid valve)

dinette sconce lights: 0.3 A apiece

bedroom reading lights: 0.3 A apiece

bedroom ceiling lights: 0.1 A (minimum) - 0.8 A (maximum)

kitchen/dinette ceiling lights: 0.1 A (minimum) - 1.7 A (maximum)

cabinet lights (per cabinet; 3 lights): 0.6 A

bathroom, shower exhaust fans: 1.2 A apiece

water pump: 1.5 A - 5.5 A

Clarion stereo: 0.7A - 1.0 A (but I’m not listening to loud music)

I recently installed Fan-Tastic 7350 upgrade kits, which (among other things) replace the old power-wasting resistor-based speed controller with a PWM type that offers a dozen speeds, including whisper-quiet extremely slow. On the slowest speed it draws less than a tenth of an amp, while on the highest speed it draws 2.1 amps.

A few numbers from items not installed by the factory:

MacBook Pro: 4.5 A (maximum, when charging from a low battery state)

Dickinson P12000 wall fireplace fan: 0.1 A

AirSense 10 CPAP: 0.3 A (without hose heat), 4.5 A (hose heat @ 75° F.)

Caframo 12 V portable fan: 0.2 A (low), 0.4 A (high)
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Old 01-14-2018, 11:10 AM   #4
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P.S. - I meant to include a link to the Fan-Tastic 7350 upgrade kit. Not cheap, but it gives you a rain sensor with automatic lid closure, wireless remote control, bidirectional fan, more than a dozen speeds including extremely slow/quiet, and very low power consumption at the slow speeds.
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Old 01-14-2018, 12:11 PM   #5
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Paprika ,

Great job ! That’s the awesome knowledge out here on forums we’re talking about !
Like the fan mod you mentioned.

“Off” saves power too ! Ha.
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Old 01-14-2018, 12:18 PM   #6
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Great info. Thanks to both the OP and Paprika. Would never have thought about the door heater in the fridge, and who would’ve thought the “use” switch would consume so much...
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Old 01-14-2018, 01:22 PM   #7
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Great data. I’m going to have to do some research and measuring on my draws.
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Old 01-16-2018, 08:22 AM   #8
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Consumption TT

Quote:
Originally Posted by Acheron2010 View Post
There are a number of solar size charts and calculators on the Internet - this is one example.
Has anyone performed a baseline survey of their stock late model TT? While I am personally interested in a Flying Cloud FB27, almost any model will do.
Lights, furnace, fan, stereo, detectors, microwave, powered awnings, water pumps - anything and everything electrical in your unit before adding your own coffee maker, toaster, etc.
It would be nice to say the Basecamp has X total amp hours per day and the Classic 30 has Y total amp hours per day. Then we could add or subtract our own accessories to determine our personal use, then size batteries, solar panels and/or generators accordingly.
I made a such survey few years ago in my 2011 Flying Cloud 23 FB for my solar panel and additional battery calculation. See Excel sheet attache. Hope this help.
If you need additional info or English translation, send me a private message.
Michel
Attached Files
File Type: xlsx AUTONOMIE.xlsx (22.3 KB, 22 views)
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