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Old 10-08-2014, 07:57 AM   #121
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Wow,
Those are some neat units and the technology being used is unbelievable, with 12v air conditioning and lithium batteries and fuel cells in lieu of gas generators, amazing. Now explain to me why Aussies and Canadians do not exchange this technology in order to bring it to the North american continent??
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Old 10-08-2014, 08:02 AM   #122
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Wow,
Those are some neat units and the technology being used is unbelievable, with 12v air conditioning and lithium batteries and fuel cells in lieu of gas generators, amazing. Now explain to me why Aussies and Canadians do not exchange this technology in order to bring it to the North american continent??
Hi: cpaharley2008... We don't have enough SUN!!! Alf
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Old 10-08-2014, 04:15 PM   #123
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... A 12 Volt deep cycle battery has six cells that each output approximately 2.12-2.15 Volts. Generally, the the larger/heavier the lead plates in the cells are, the longer they will last, and the more deep cycle discharges/recharges they will take. The 6 Volt batteries have 3 cells instead of 6, even though their outer dimensions are roughly the same. Most 6 volts batteries therefore can use larger plates, and will last longer in a deep discharge/recharge situation - like an RV.
There isn't one (or any fixed number) of plates per cell, so dividing the plates in the box by the number of cells in the box doesn't say anything about the plate thickness. The plate thickness is chosen to suit the severity of service (as mentioned above), and is the same in any voltage of battery in the same product line. Fewer cells in the same size box just means more plates in a cell.

I should have said "6V or 12V doesn't matter to total capacity within batteries of the same construction". In fact, I did earlier...
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... For the same total weight and bulk in the same range of batteries (same type and quality), it doesn't matter electrically whether they're split up in groups of three cells (6V) or of six cells (12V).

The usual problem is comparing apples (general-purpose batteries, most often 12V) with oranges (heavy-duty deep cycle batteries, very often 6V but availalble in 2V, 4V, 6V, 8V, and 12V). In practice, most 12V batteries sold for RVs are not the best heavy-duty designs, and the most readily available reasonably priced heavy-duty batteries are in 6V models.

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PS - it's also one of the reasons the 6 volt batteries are widely used in applications other than an RV where deep discharge and recharge occurs frequently - like a golf cart.
The standard equipment from most golf car manufacturers, according to online specs from them last year, an option is six 8-volt batteries, in series for a 48-volt system. For 1/3 more capacity, at the expense of 1/3 more weight of batteries, is eight 6-volt batteries for the same system voltage. Voltage doesn't matter - construction, total amount of lead, and being able to lift each box in the set are the determining factors. Since 6-volt batteries are common, and are usable in a 12-volt system (unlike 8-volt batteries), they are a good affordable choice for RVs.
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Old 10-08-2014, 04:23 PM   #124
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Originally Posted by cpaharley2008 View Post
Wow,
Those are some neat units and the technology being used is unbelievable, with 12v air conditioning and lithium batteries and fuel cells in lieu of gas generators, amazing. Now explain to me why Aussies and Canadians do not exchange this technology in order to bring it to the North american continent??
The EFOY fuel cells - which are methanol-fueled - are available in Canada and the United States. I've seen them at RV shows here, carried by a ordinary RV dealerships. They're expensive to buy, and expensive and inconvenient to fuel, but they are interesting... and maybe a good match for a compressor-type refrigerator (because they have constant low output to match the round-the-clock demand of the refrigerator).
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Old 10-08-2014, 06:08 PM   #125
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Used RM8551 available soon...

Used RM8551 available soon...

Well I pulled the trigger today and ordered a new 7.3 cuft Nova Kool RFU8520 DC compressor refrigerator for my 19' to go in where my RM8551 (4.3cuft) is currently installed. This new unit has a 5.7 cuft refrigerator and a 1.6 cuft freezer with two doors. It is wider and taller than the RM8551 unit and I will lose my microwave (no problem!) and will have to do a fair amount of fine woodworking to make the new cutout but I am good with this stuff. I will pick it up locally around the end of November and then start a new thread on the installation. When finished the old RM8551 will be available...:

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Old 10-08-2014, 06:19 PM   #126
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Used RM8551 available soon...

Well I pulled the trigger today and ordered a new 7.3 cuft Nova Kool RFU8520 DC compressor refrigerator for my 19' to go in where my RM8551 (4.3cuft) is currently installed. This new unit has a 5.7 cuft refrigerator and a 1.6 cuft freezer with two doors. It is wider and taller than the RM8551 unit and I will lose my microwave (no problem!) and will have to do a fair amount of fine woodworking to make the new cutout but I am good with this stuff. I will pick it up locally around the end of November and then start a new thread on the installation. When finished the old RM8551 will be available...:

Steve
Good to hear Steve. I'll be very interested in the fridge's actual duty cycle and power consumption, since we'll have the same solar and battery setup you have.
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Old 10-08-2014, 06:24 PM   #127
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Good to hear Steve. I'll be very interested in the fridge's actual duty cycle and power consumption, since we'll have the same solar and battery setup you have.
I carry jumper cables...just in case!!..
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Old 10-09-2014, 10:25 AM   #128
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7.3 cuft Nova Kool RFU8520
Is this model number correct ? I cannot find this model on their web site.

Nova Kool, refrigerators, freezers, Marine, RV, Truck
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Old 10-09-2014, 10:45 AM   #129
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7.3 cuft Nova Kool RFU8520
Is this model number correct ? I cannot find this model on their web site.

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Sorry, RFU8320 not 8520.
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Old 10-09-2014, 10:50 AM   #130
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Thank you for the correction. I admire your initiative !
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