| Re: [GMCnet] Gmclist Digest, Vol 136, Issue 20 [message #349962] |
Fri, 08 November 2019 11:40  |
Dean Hanson
Messages: 114
Registered: May 2018
Karma: 2
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Senior Member |
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I believe you all are forgetting or ignoring the biggest electrical load of
all: The fan for the furnace. Especially in Grand Tetons National Park in a
snow storm. Runs- uses battery so runs slower. Continues to run more slowly
so runs more slowly. Etc Etc. I mostly dry camp and will not run generator
when sleeping. My solution: More blankets, no heat, until I am up then I
still have enuf battery to start up generator.
JWID
Dean the Resourceful Norse Hanson. 75 Avion
------------------------------
Message: 3
Date: Fri, 08 Nov 2019 07:15:03 -0700
From: Bruce Hislop
To: gmclist@list.gmcnet.org
Subject: Re: [GMCnet] Here we go again
Message-ID:
Content-Type: text/plain; charset="utf-8"
Just to clarify, in his last paragraph where Todd referred to the 90 Amp TV,
he meant 90 Watts. So a TV consuming 90 Watts through an Inverter with
an efficiency of 80% would consume approximately 112 watts (90/0.8) from the
battery. In round figures, that's about 10Amps at 12V Over 3 hours that
would be 336 watt-hrs or about 1/3 of the 100 Amp/hr battery's capacity.
But don't forget you shouldn't discharge a lead-acid battery beyond 50% or
its cycle life will drop drastically. So in real terms that's about all you
could discharge from a lead-acid battery considering you likely also had an
LED light on, used the water pump a few times and even a roof fan going.
Actually if you had watched TV and had the roof fan going all night you
would likely have deep discharged the 100 Amp-hr battery by morning.
My 150W panel flat on top of my storage pod through a PWM controller will
give me about 6.5 amps @ 13.8V = 90 watts in bright sunshine. My panel is
rated at 8.3 Amps @ 18V, so with a MPPT controller I might be able to get
8.3A x 13.8V = 115W. I would need to track the sun to get close to the rated
150 watts from the panel.
Unless you have lots of solar panel power and lots of battery capacity
(LiFePO4 batteries... Read $$$), you are better to start the generator to
run
high current appliances like coffee makers, microwaves and toasters.
Just my 2 cents.
--
Bruce Hislop
ON Canada
77PB, 455 Dick P. rebuilt, DynamicEFI EBL EFI & ESC.1 ton front end
http://www.gmcmhphotos.com/photos/showphoto.php?photo=29001
My Staff says I never listen to them, or something like that
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| Re: [GMCnet] Gmclist Digest, Vol 136, Issue 20 [message #349965 is a reply to message #349962] |
Fri, 08 November 2019 13:06  |
mghamms
Messages: 466
Registered: March 2016
Location: Ware, Massachusetts
Karma: 2
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Senior Member |
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I bought an electric blanket that has a ac dc converter that will run off my modified wave inverter. Not the most efficient use of battery power but works.
1977 Kingsley 455 as stock as it gets except lots of Ragusa parts
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