A Wrangler isn't like any other overland rig when it comes to power. The roof comes off. The cargo area on a 2-door is barely there. Many JLs already have two batteries from the factory, and neither one is meant for your fridge. Plan around those quirks and a Wrangler can run a fridge, lights, and devices for days. Ignore them and you end up with panels you can't mount and wires you have to pull every time the top comes off.
Here's how to plan a Wrangler power setup that works with the Jeep, not against it.
This guide is written for the JL (2018 and newer), with notes for the JK (2007–2018) where it's different. The 4xe plug-in hybrid and eTorque models have extra hybrid electrical systems, so have anything under the hood checked by an installer who knows them.
Start With What You'll Run
Add up what you'll actually power before you buy anything. A fridge is the big draw for most people. Here's where most Wrangler builds land:
| Setup | Battery | Charging |
|---|---|---|
| Weekend trips: lights, phones, small fan | Portable power station | 12V socket while driving, plus a folding panel at camp |
| Fridge + lights + devices | 100Ah LiFePO4 | 30A DC-DC charger + 100–200W solar |
| Longer trips (4-door), bigger fridge | 200Ah LiFePO4 | 40A DC-DC charger + 200–400W solar |
Put your own gear into our Overland Power Calculator, then tap Wire It Up to turn the results into a wiring diagram.
Know Your Factory Batteries First
Pop the hood on a JL with Auto Start/Stop and you'll likely find a small second battery next to the main one. It's there to keep the electronics steady while the engine shuts off at red lights. It's small, it belongs to the start-stop system, and it is not a place to hook up a fridge or lights.
Your accessory battery, the "house" battery, is a separate battery you add. Keep it completely separate from the factory system and charge it with a DC-DC charger (more on that below).
Where the Second Battery Goes
This is where 2-doors and 4-doors split:
Under the Hood
✓ Keeps the tiny cargo area free (big deal on a 2-door)
✓ Short cable runs
✓ Dual battery kits exist for JL and JK
✗ Kits usually replace the stock tray and need matching lead-acid/AGM batteries
✗ Engine heat is hard on batteries, lithium especially
✗ Check fitment for your engine and year
Rear Cargo Area
✓ Room for a lithium battery (easy on a 4-door)
✓ Out of the engine heat
✓ Right next to your fridge
✗ Long cable run from the engine bay
✗ Takes space a 2-door doesn't have much of
✗ Needs a solid, strapped-down mount
4-door (JLU / JKU): put a LiFePO4 battery in the cargo area, behind the rear seat. It's out of the heat, close to the fridge, and lithium gives you the most usable power for its size. In the desert, keeping lithium out of the engine bay matters a lot.
2-door: space is the problem. Either a compact 100Ah lithium battery in a low box behind the seat, an under-hood dual battery kit, or a portable power station you can pull out at camp. A power station is often the simplest answer on a 2-door.
Wherever it goes, strap it down hard. Wranglers see rough trails, and in a crash a loose battery becomes a missile.
Charging While You Drive
Wrangler alternators have plenty of output for a second battery: the JK's 3.6L is usually 160 amps, and JLs came with roughly 180 to 240 amps depending on options. The right way to charge a house battery is a DC-DC charger (battery-to-battery charger). It's required for lithium, it handles long cable runs, and it plays nicely with modern charging systems.
- Size: a 30A charger suits a 100Ah lithium battery; 40A suits 200Ah. Charging a small battery too fast shortens its life, so bigger isn't automatically better.
- Ignition wire: on a JL, connect the charger's ignition (D+) wire so it knows when the engine is running. Newer vehicles manage the alternator voltage in ways that can confuse chargers without it.
- Cable: a run to the cargo area is long, so the cable has to be thick. For a 40A charger, figure 6 AWG up to about 16 ft and 4 AWG beyond that.
- Fuses: fuse at the starter battery and at the house battery end. Our dual battery guide explains why both ends matter.
Measure your real cable run, then plug it into our free Wiring Diagram Builder for every wire size, every fuse, and a parts list.
Solar on a Jeep (The Roof Comes Off)
This is the biggest Wrangler difference. Hardtops have removable panels over the front seats, and soft tops can't carry anything. So where does solar go?
- Frame or roll-cage mounted rack: the best option for permanent panels. These racks bolt to the body and roll cage instead of resting on the top, so you can still remove your hardtop panels. Check that the rack works with your top: some kits don't fit soft tops or the power Sky One-Touch top.
- Hardtop-mounted racks: simpler, but they only work with the factory hardtop, and the panels go wherever the top goes.
- Folding portable panel: the most Jeep-friendly answer. Nothing to mount, nothing to unwire when the top comes off, and you can park in the shade and put the panel in the sun. Great on a 2-door.
How much fits on a rack depends on the rack and the doors. A 100W rigid panel is roughly 42 × 20 inches, so measure your rack's flat area and leave room for recovery boards. A 4-door rack fits more than a 2-door. Use rigid panels on a rack. Flexible panels stuck to a hardtop trap heat and are hard to route wires from without drilling.
Put a weatherproof plug (like a DT connector) where the panel wires enter the Jeep. When the top or rack comes off, you unplug instead of cutting wires.
The easiest solar for a Jeep. Nothing to mount, nothing to remove with the top, and it chases the sun while the Jeep sits in the shade.
View on AmazonA rack-friendly size. Fits alongside recovery boards, and you can add a panel at a time as your needs grow.
View on AmazonFor 4-door racks with room to spare. Check its size against your rack before you order.
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Fixed panels need an MPPT charge controller near the house battery. Some DC-DC chargers have a solar input built in, which saves you a separate controller.
The JL's Factory AUX Switches
Many JLs have four AUX switches on the dash, ready for accessories. On factory-equipped Jeeps, AUX 1 and 2 are typically rated 40 amps and AUX 3 and 4 are 15 amps. They're perfect for lights, an air compressor, or a winch control. Check your owner's manual for your Jeep's exact ratings, because add-on switch kits can differ.
One catch: the AUX switches run off the starter battery. Use them for things you run while driving or for short periods. Your fridge and anything that runs overnight belongs on the house battery and its own fuse block. JKs don't have factory AUX switches, so JK owners usually add an aftermarket switch panel.
The Factory 115V Outlet
Some JLs have a 115V outlet on the back of the center console. It's small, around 150 watts, which is fine for a phone or a laptop and not much else. For a CPAP overnight, a blender, or camera batteries at camp, add a proper inverter on your house battery. The Wiring Diagram Builder sizes one for you.
The Bottom Line
4-door: a 100Ah LiFePO4 battery in the cargo area, a 30A DC-DC charger with the ignition wire connected, and 100–200W of solar on a cage-mounted rack or a folding panel. Going bigger? Step up to 200Ah and a 40A charger.
2-door: keep it compact. A portable power station or a compact lithium battery, a DC-DC charger, and a folding panel is the setup that fights the Jeep the least.
Leave the factory batteries alone, fuse every cable that touches a battery, and plan your solar around a top that comes off. Do that, and your Wrangler will keep the fridge cold on the trail.
Have a question about your Wrangler setup? Reach out. We're happy to help you plan it right the first time.