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Old 03-02-2014, 11:41 AM   #51
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Originally Posted by JaneM. View Post
... We use propane when dry camping, but if this were an option it would stretch the propane.
At the rate of propane usage stated in the owners manual for my 6.7 fridge, a 20 lb propane tank should last for between 3 and 4 weeks. That assumes continuous 24 hr per day fridge operation with no other drains on your propane ( ie hot water, stove, furnace, BBQ, etc). At the rates I paid for propane on my last tank, that is about $0.75 per day.
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Old 03-02-2014, 11:44 AM   #52
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That's great information - thanks! Since we don't yet have our trailer, I don't have an owners manual to check these things.
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Old 03-02-2014, 11:44 AM   #53
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The Dometic RM8551, 4.3 cubic ft. refrig in our 2013 19' Escape uses 11 amps in the 12V mode. The realistic maximum output of one 95W photovoltaic solar panel (in full sun) installed by ETI is 7 amps.
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Old 03-02-2014, 11:48 AM   #54
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The Dometic RM8551, 4.3 cubic ft. refrig in our 2013 19' Escape uses 11 amps in the 12V mode. The realistic maximum output of one 95W photovoltaic solar panel (in full sun) installed by ETI is 7 amps.
Wow, that's great information! Thanks!
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Old 03-03-2014, 10:31 AM   #55
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Doesn't leave much for charging if using a 90W array. Our fridge is only A/C and LP, no DC mode. Or last fridge was 3 mode and we never used the DC mode.

Yeah sounds fun, but not particularly practicle.
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Old 03-03-2014, 12:53 PM   #56
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The Dometic RM8551, 4.3 cubic ft. refrig in our 2013 19' Escape uses 11 amps in the 12V mode. The realistic maximum output of one 95W photovoltaic solar panel (in full sun) installed by ETI is 7 amps.
Could you explain more about the maximum output of the 95w being 7 amps? When I look at the go power site it states the rated current is 5.53 amps?
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Old 03-03-2014, 01:02 PM   #57
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Has anyone determined what their tow vehicle 12v output is? Between the solar and your tow vehicle you should have adequate supply and still have your battery providing the difference.
Remember the refer normally has a 50% run time so it is using perhaps 6 amps per hour, your solar is providing 5-7 per hour, your tow vehicle maybe another 2-3 per hour, I see no issue with the 12v set up while towing in daylight. Now night time, with the running lights on and no solar there maybe an issue.
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Old 03-03-2014, 01:13 PM   #58
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Could you explain more about the maximum output of the 95w being 7 amps? When I look at the go power site it states the rated current is 5.53 amps?
On GP site the 95W panel specs are 5.53A @ 17.2 volts. 5.53A x 17.2V = 95 W. The regulator/controller regulates the voltage and amperage charge to the batteries. When our two 6v batteries were depleted to 45% the digital read out on the regulator/controller showed 7A. The regulated amperage and voltage charge rate is dependent on the batteries state of charge. As the voltage rate goes down the amperage goes up. 95 watt panel @ 12V and 7.91A =95W
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Old 03-03-2014, 04:32 PM   #59
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Could you explain more about the maximum output of the 95w being 7 amps? When I look at the go power site it states the rated current is 5.53 amps?
To get 95 W from 5.53 A would be 17.18 V - I assume that the peak power conditions (IMP and VMP) are 5.53 A would be 17.18 V, and that might be called the "rated" conditions. One Go Power page for a 95 W panel lists 17.5 V at 5.53 A as the "rated" current and voltage (which is closet to 97 W). If there were no load on the panel (a short circuit), the current could be much higher (Isc - not listed on that Go Power page). At 12 volts, 95W would be 7.9 amps, but the panel can't do that (can't produce 95 W at that voltage), because it is not in its optimal peak power state.

7 amps sounds like an estimate of what the panel might put out into a battery which is discharged to a very low state, so the charging voltage is low (around 12V); without charging a battery, connected to a load with the right resistance to result in 12V, the current would be the same. In this example, the assumption is that at 12V (instead of the ideal 17.5 V) the panel can only produce about 84 W (12V * 7A). Even in full sun, the current would decrease as the battery charges and the voltage comes up.
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Old 03-03-2014, 04:36 PM   #60
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As always, "amps per hour" doesn't make sense, so here's what I think Jim is saying:

Remember the refer normally has a 50% run time so it is using perhaps 6 amps, your solar is providing 5-7 amps, your tow vehicle maybe another 2-3 amps, I see no issue with the 12v set up while towing in daylight.

or
Remember the refer normally has a 50% run time so it is using perhaps 6 amp-hours per hour, your solar is providing 5-7 amp-hours per hour, your tow vehicle maybe another 2-3 amp-hours per hour, I see no issue with the 12v set up while towing in daylight.
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