Anyway, just wondering about how to mount the fridge. I checked out the MSA 4x4 fridge slide but the DS60 (drop slide 60) is Fridge Tray: 870mm x 530mm which would have it at 5mm short (width) for the 80LD not to mention the fact it comes with a hefty price tag $749 for the drop slide. The non drop slide (SL60) is smaller again -Fridge Tray: 852mm x 525mm.
I think you might have mistaken the external dimensions and fridge footprint sizes. The external dimensions take into account the fridge handles, lid hinges, etc. but as these all sit higher up on the fridge, they don't affect the fridge fitting onto a fridge slide. The footprint dimensions are the measurements at the base of the fridge, which is what you want to use when you're looking for a fridge slide, as only the bottom of the fridge sits in the slide.
Giant Power 80L Dual Door
External: 865mm L x 535mm W x 560mm H (includes handles etc.)
Fridge Footprint: 825mm L x 495mm W (fridge base)
MSA DS60: 870mm L x 530mm W
MSA SL60: 852mm L x 525mm W
You should have a bit of wiggle room with either slide option.
What mount points does the fridge itself have?
Typically the fridges will be held in place by straps to the handle, as the handles have a reinforcing plate behind them.
Question about the dual door 80L vs single door 80L. Apart from footprint are there any other advantages of one over the other?
There are some minor advantages to the dual door. Two lids have the potential to increase efficiency, particularly if you are in and out of your fridge a lot. Every time you open the lid you'll lose a bit of temperature to the outside, so if you're only opening up half of the fridge you'll save a bit. The single door has two plastic internal lids to help mitigate this, but it's not as good as two individual doors with seals. The wider style also makes it easier to get your items out as they aren't buried quite as deep.
Also, I have a dual battery monitor and just wondering how this would perform if the second battery was actually two batteries linked? Would I actually need a 3rd sensor / monitor or would it just trat them as if they were one battery? Would it still be possible to use this
hall effect device to measure current amps being drawn?
I'm not familiar with the hall effect sensor, but when two batteries are linked with appropriate sized cable they will act as a single large battery. In theory you could get away with a single sensor, but ideally you would have one for each battery.