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Old 05-14-2009, 12:25 AM   #21
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Re: refrigerator


This site makes reference to start up power requirements, but doesn't give numbers. However it is a useful table and aimed at solar users:

http://www.kgelectric.co.za/appliance%20power.htm

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Old 05-14-2009, 12:32 AM   #22
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Re: refrigerator

Just to put things in perspective, I acquired a 25 watt, one cup coffee maker from Starbucks on sale some time ago. I plugged it into my 100 watt inverter in the company car and melted the cigarette lighter plug.

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Old 05-14-2009, 02:16 PM   #23
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Re: refrigerator

Thanks Abaglo

Great info on the two links. If reece is correct (he is going to check on it) at 1 amp X 120 volts = 120 watts X 1.15(Inverter loss) = 138 watts per hour so a 300 watt inverter (138 watts divided by 120 volts = 1.15 amps per hr) so there for a 120 ah 12 volt battery should run the frige for 10.4 hrs i think.
( take 120ah divided by 10=12ah@120 volts so 12 ah divided by 1.15 =10.4 hrs) . whew now i have a headache and need a beer (thats not a bad thing) its 90 here and a beer sounds right. This might just work and not have to run the propane while running. THANKS ALL

Walt & Linda
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Old 05-14-2009, 09:29 PM   #24
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Re: refrigerator

Hi: wpski...Walt Take two aspirins and call me in the morning Did you allow for a 50-60% depletion of the capacity of the battery before charging, or did you use 100%
Math was never my strong suit.
I'm not sure what kind of life a battery would have under complete depletion& recharging. That maybe the reason the larger fridges are only two way not three!!!
It's not 90* here but the beer sounds good anyhoo. Alf
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Old 05-21-2009, 04:51 PM   #25
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Re: refrigerator

I assume your wife is taking Forteo, as it's the only daily injectable med for Osteoporosis that I know of. You are correct that it does need to be keep stored between 36 and 46 degrees F. It should never be frozen, so be careful in the RV. Sometimes mine will freeze things after a few days of being on high. It's OK to run your fridge on propane while going down the road. You should shut it off when entering a filling station to refuel, however. Just leave it on and if/when you plug up to shore power the fridge will switch to AC.

Good luck in your travels.

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Old 05-21-2009, 06:20 PM   #26
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Re: refrigerator

Quote:
Originally Posted by wpski
Thanks Abaglo

Great info on the two links. If reece is correct (he is going to check on it) at 1 amp X 120 volts = 120 watts X 1.15(Inverter loss) = 138 watts per hour so a 300 watt inverter (138 watts divided by 120 volts = 1.15 amps per hr) so there for a 120 ah 12 volt battery should run the frige for 10.4 hrs i think.
( take 120ah divided by 10=12ah@120 volts so 12 ah divided by 1.15 =10.4 hrs) . whew now i have a headache and need a beer (thats not a bad thing) its 90 here and a beer sounds right. This might just work and not have to run the propane while running. THANKS ALL

Walt & Linda
Sorry to have missed this.

1 A x 120 V x 1.15 (inverter loss) = 138 W. - And a 300 W inverter will do. I would imagine that going over 300 W at start-up will be okay, since it is only a fraction of a second.

138 W / 12 V = 11.5 A DC on the 12 V side.

120 Ah / 11.5 A = 10.4 hours

So, while I quibble with Walts's use of watts per hour and amps per hour, I do agree with his conclusion. But Escape Artist is right: we must keep in mind that those amp-hour ratings are based on a set of technical assumptions, and won't necessarily jive with your results.
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Old 05-27-2009, 04:12 AM   #27
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Re: refrigerator

I am now a little confused. If a person has a 3 way fridge should one just shut it down when driving so the battery will charge? Should one run it on propane while driving so the battery will charge? Should one run it on 12 volt because the battery will charge anyway? How does operating the fridge cut into a battery recharging?
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Old 05-27-2009, 06:47 AM   #28
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Re: refrigerator

Hi: Greig... We had a Boler B4 our 5.0. I had a battery installed on the tongue of the trailer and a charge wire thru the tug to the plug, so we could run 12V. while driving. The charging system in the tug would charge both batteries fine...but if stopped for any length of time like sight seeing or lunch is when the fridge "cut into a battery recharging". The fridge could drain both batteries, trailer and tug pretty fast.
With the 5.0 we make sure the fridge is thoroughly chilled B4 leaving home and that it gets hooked to shore power on arrival and we have yet to run it on propane either while driving or camping. Alf
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Old 05-27-2009, 01:39 PM   #29
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Re: refrigerator

If you have the 12V choice though, would you drive with your fridge on? I had the feeling last year that my battery was not charging well and was wondering if the fridge was slowing down the charging.
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Old 05-27-2009, 01:49 PM   #30
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Re: refrigerator

There is a good chance that having the fridge on 12V while driving will draw a fair bit of the current from the tow vehicle, leaving less for charging the battery. And like Alf said, if you stop a bunch set up like this without the engine running and charging, you will draw down the batteries quite a bit.

Somewhere I read that if you plan to run the fridge on 12V while driving, it is a good idea to upgrade the charging wires to at least #10 wire to give less resistance in the wiring, and allow more current through to better charge the battery. The fridge will not draw on the extra capacity, but the battery charger will do better for it.

If going less then a couple hours, I don't worry about having the fridge on, but if longer then that I do use the propane, unless not allowed.
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