Cool-J 48V Off-Grid Inverter Rooftop Air Conditioner
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The Owner's Insights on the Cool-J 48V Off-Grid Inverter Rooftop Air Conditioner
The 48V part is the whole point. This runs straight off a 48V DC system, so you're not burning power through an inverter to make 240V and then turning it back into DC inside the unit. On an off-grid van that difference shows up in how long your batteries last.
It's an inverter unit, which means it doesn't just switch on and off at full noise. It ramps between 5,100 and 13,800 BTU to hold the temperature you set. That's why it sits at 46 dB on low instead of thumping away all night.
Before you get excited, check two things on your van. It needs a 400x400mm roof hatch opening (362x362mm is an option), and it's 42kg going on your roof. If both of those work, this is one of the better off-grid air conditioners going.
Why You'll Love the Cool-J 48V Off-Grid Inverter Rooftop Air Conditioner
- 48V DC, no inverter needed. Runs straight off your battery bank instead of through 240V.
- 5,100 to 13,800 BTU cooling. It ramps to hold your temperature, not just on and off.
- 5,100 to 13,000 BTU heating. The same unit takes the edge off your cold mornings.
- 46 dB on low. Quiet enough that you can actually sleep under it.
- 253mm tall. Low profile on your roof, so less drag and less height.
- WiFi and remote control. Cool the van from your phone before you get back to it.
- Dual-fan design. Less vibration coming through your ceiling.
- HIGHLY compressor, metal base. The parts that matter aren't where they saved money.
Why You Should Consider a Cool-J Rooftop Air Conditioner
Cool-J build 12V and 48V rooftop air conditioners for the Australian off-grid market, and this is their quiet 48V inverter model. See the rest of the air conditioner range.
Cool-J 48V Off-Grid Inverter Rooftop Air Conditioner Specifications
| Power supply | 48V DC |
| Rated cooling capacity | 11,900 BTU/h (5,100 to 13,800) |
| Rated heating capacity | 11,600 BTU/h (5,100 to 13,000) |
| Current (cooling / heating) | 12-32.8A / 10.5-27.8A |
| Power consumption (cooling / heating) | 583-1,752W / 510-1,333W |
| EER / COP | 2.7 / 3.0 |
| Noise level indoor (low/med/high) | 46 / 49 / 52 dB(A) |
| Dimensions | 1,056 x 738 x 253mm (L x W x H) |
| Weight | 42kg |
| Ceiling opening | 400 x 400mm, or 362 x 362mm optional |
| Compressor | HIGHLY |
| Base chassis | High-strength metal |
| Inner frame | EPP |
| Control | WiFi and remote, both included |
| Ceiling lamp | Multicolour LED strip included |
| Model | RTN2-ACRG16 |
Why 48V DC beats a 240V unit off-grid
A standard 240V rooftop unit on an off-grid van has to run through an inverter. You lose power in the conversion, then the air conditioner's own electronics convert it back down again. This one skips both steps and takes 48V DC straight from your battery bank. It draws between 583W and 1,752W depending on how hard it's working, so you can size your battery and solar against real numbers rather than guessing at inverter losses.
What an inverter compressor changes at night
A conventional air conditioner has one speed: full. It runs hard, overshoots, shuts off, and starts again twenty minutes later, and each of those starts wakes you up. This one varies its output between 5,100 and 13,800 BTU to hold the temperature you set, so it settles into a low, steady 46 dB and stays there. If you've camped next to someone with a cheap rooftop unit, you already know why that matters.
Check your roof before you order
Two numbers decide whether this fits your van. The ceiling opening needs to be 400 x 400mm, though a 362 x 362mm option is available, so measure your existing hatch rather than assuming. Then there's weight: 42kg going onto your roof, which is fine on most caravans but worth checking against your payload and your roof structure if you're fitting it to something lighter. Ring the store on 03 7056 6732 if you're not sure.
Heating as well as cooling
It's a reverse-cycle unit, so the same box that cools you in February takes the chill off a morning in July, at 5,100 to 13,000 BTU with a COP of 3.0. For most people that means you're not carrying a separate heater, which saves space and weight. It won't replace a diesel heater in genuine alpine cold, but for the mornings most Australian travellers actually see, it's plenty.
Getting it installed
This is a roof-cut job on a 48V system, so it's not a DIY afternoon unless you've done it before. The install manual is on this page, and it covers the opening dimensions and the mounting. Get an auto electrician or a caravan fitter who works with 48V systems to do the wiring, because the current draw runs up to 32.8 amps and the cable sizing has to match. Call the store on 03 7056 6732 and we'll talk you through what's involved.
What's Included
- Cool-J 48V DC inverter rooftop air conditioner
- Remote control
- WiFi control
- Multicolour LED ceiling light strip
- Installation manual
What's Not Included
- Professional installation and roof cutting
- 48V cabling and fusing
- A 48V battery bank to run it
The remote and the WiFi control both come with it, so there's nothing extra to buy on the control side. What you do need is a 48V system sized to handle up to 1,752W of draw, and someone who knows what they're doing to fit it.
Not Sure Which Rooftop Air Conditioner Suits You?
The Cool-J 48V suits you if you run a 48V off-grid setup and you want quiet, efficient cooling without the inverter losses. It's the wrong pick if your van is a standard 12V system or you're always on powered sites, where a 240V rooftop unit costs less and does the same job. Not sure if it fits your roof or your battery bank? Call the store on 03 7056 6732, or send an SMS to 0476 330 590 and we'll check it with you before you order.
Cool-J 48V Rooftop Air Conditioner Installation Manual
Download the Cool-J 48V Off-Grid Inverter Rooftop Air Conditioner user manual for full technical details and setup instructions.
