Before you rent a camper in South Africa, understand the power setup. Real numbers on solar, battery Ah, and fridge draw -- no guesswork needed.
You are three days into a seven-day trip in the Kalahari. The campsite has no power points. You reach into the fridge for a cold drink. Nothing cold. The fridge is off. The battery indicator is sitting at zero.
Almost every time this happens, the problem started before the trip, usually in the five minutes spent looking at a listing without knowing what to check.
Of the 381 campers and trailers currently listed on Kampi, 154 specifically mention a fridge and 97 carry some form of solar power. These are trailers with real electrical setups. But a 100Ah AGM battery with a 100W solar panel is a very different proposition to 200Ah lithium with 200W of panels, even if both listings describe it as "battery and solar included."
This guide explains the difference in plain language. Not to turn you into an electrician, but so you know what to ask before booking and how to run things correctly once you are on site.
A 12V compressor fridge is not a passive device. It runs a small compressor motor that switches on and off throughout the day and night to hold temperature. How often it runs (its duty cycle) is driven almost entirely by how hot it is outside.
National Luna, South Africa's home-grown fridge manufacturer for 30 years, publishes tested consumption figures for a 60-litre fridge set to +4°C:
This is the variable most renters miss. The same fridge that draws 16 Ah/day on a spring trip to the Garden Route will draw 35 Ah/day on a midsummer run through Mokala. The battery that coped perfectly in September will be flat by breakfast in December.
Most renters walk up to the fridge controller and push it to the coldest setting. A fridge set to -6°C uses more than three times the power of the same fridge set to +4°C. At -16°C, the draw nearly doubles again versus -6°C. The gap between "cold enough for food and drinks" and "as cold as it goes" can cost you a full battery cycle overnight.
"Set your fridge to the job it needs to do, not to the coldest setting it offers," says JP Voogt, who founded Kampi in 2021. "For drinks and fresh food, +4°C is fine. Freeze your meat at home and carry it in a sealed cooler bag. That one decision can add two days to your power budget."
Stocking also matters. Loading warm drinks and food into the fridge at camp forces the compressor to work overtime for the first few hours. Pre-cool everything the night before you depart. It makes a real difference on day one.
Every listing will tell you the battery capacity: 100Ah, 105Ah, 200Ah. What listings rarely spell out is how much of that capacity you can actually use. That depends on the battery chemistry.
AGM (Absorbed Glass Mat) lead-acid batteries are the most common in South African trailers. They are reliable, handle rough roads and vibration well, and cost much less than lithium upfront.
The catch is depth of discharge. You cannot safely discharge an AGM battery below 50% of its rated capacity without shortening its life a lot. A 105Ah AGM gives you roughly 52 usable amp-hours. Push it harder and you will not get the expected 300-500 charge cycles. You will get far fewer.
In practice: a trailer advertised as having a "105Ah deep cycle battery" has about 52 Ah of usable overnight capacity. A single 60-litre fridge drawing 25 Ah/day at 32°C will consume that by morning. Before solar has recharged anything, the battery is already at its safety threshold.
Lithium iron phosphate batteries are now the standard for serious SA overlanding. The usable capacity is 80-90% of the rated figure. A 100Ah lithium battery gives you 80-90 usable amp-hours, compared to 50Ah from a 100Ah AGM. It also weighs about half as much, which matters when a trailer has a payload limit.
A 100Ah lithium battery can run a 60-litre fridge drawing 25 Ah/day for three to three-and-a-half nights without any solar input. A 100Ah AGM manages barely one night to the same safety threshold. That is the real difference between the two.
Lithium has one limitation worth knowing for cold-destination trips: LiFePO4 batteries will not accept a charge when their cell temperature drops below 0°C. For winter camping in the high Drakensberg or the Cederberg, an AGM setup charges from solar or the alternator regardless of overnight temperatures. Many SA owners who camp in cold conditions stick with AGM for this reason.
South Africa gets more solar irradiance than almost anywhere in the world. The Northern Cape receives more peak sun hours per day than most of Europe manages in summer. That is good news for camping power setups, but it does not mean any panel in any configuration will keep any battery full.
Peak sun hours (PSH) is the standard measure of solar energy at a location. It is not total daylight hours. It is the equivalent hours of full 1,000 W/m2 irradiance per day. Based on data from the Global Solar Atlas:
"The Northern Cape gives you the best solar in Africa," says JP. "In the Kalahari in winter at 6 hours of peak sun per day, 200W of panels can fill a depleted battery in a single afternoon. The KZN coast in cloud is a completely different equation. Plan your setup for where you are actually going."
A 100W panel does not produce 100W all day. It produces 100W at peak output, in ideal conditions, at the correct angle. In real SA camping conditions (panels flat on a roof, some dust, some morning shade from trees), expect 32-38 Ah per day in good weather around Gauteng, and 38-44 Ah per day in the Northern Cape. In overcast KZN conditions, that can drop to 22-28 Ah per day.
National Luna recommends a minimum of 120-150W for a single-fridge setup. A 100W panel is marginal. In clear Northern Cape sun it keeps up. In cloud cover or at a shaded campsite, it does not.
A 200W panel in Gauteng summer conditions realistically produces around 68 Ah per day. In the Northern Cape, up to 80-85 Ah. Even on a cloudy KZN day, 55-65 Ah. That is comfortably more than a 40-60L fridge needs in most conditions, leaving room for lights, phone charging, and topping up the battery after a night of fridge use.
200W is roughly the point where you stop rationing and start just camping. Below 200W, you need to be deliberate about what else draws from the battery.
A solar charge controller sits between the panel and the battery. There are two types: PWM (Pulse Width Modulation) and MPPT (Maximum Power Point Tracking).
PWM controllers are simple and cheap. They also waste 20-30% of available solar energy. Worse, if panels are wired in series and one falls into partial shade, the entire array's output can collapse to near zero. MPPT controllers continuously calculate the optimal operating point of the panel and convert excess voltage into usable current. In real SA conditions, an MPPT extracts 15-30% more energy from the same panel.
The SA4x4 DIY solar test put this on paper: two 85W panels in series on a PWM controller produced "almost zero" output when one was partially shaded. The same panels in parallel on a Victron SmartSolar MPPT produced 171W at 12 amps in the same morning conditions. The 4x4community.co.za forum consensus is straightforward: any permanent rooftop panel above 100W should be on an MPPT controller. Victron SmartSolar is the brand SA overlanders default to.
When you look at a Kampi listing, the description usually has what you need. Here is how to read it:
The battery type matters as much as the Ah number. "100Ah AGM" and "100Ah lithium" give you roughly 50 Ah and 80-90 Ah of usable capacity respectively. The number without the chemistry is only half the picture.
Solar wattage tells you the recharge rate. 80-100W is marginal for a fridge-only setup. 150W is adequate in good sun. 200W gives you headroom, including for overcast days. A listing that also mentions a Victron SmartSolar or MPPT controller has been set up by someone who uses the trailer regularly. A listing that just says "solar" with no further detail is worth a question before committing to a week off-grid.
Watch for dual-zone fridges. A fridge running a separate freezer and fridge compartment simultaneously draws a lot more than a single-compartment unit. A 90L twin-zone at -15°C freezer and +1°C fridge can draw 55 Ah or more per day in summer conditions. The same battery that runs a 60L fridge for three nights may only last one night with the twin-zone.
"Owners who run their own trailers know these numbers," says JP. "If someone cannot tell you the battery's Ah rating and the solar wattage, that tells you something about how often the trailer actually gets used."
Minimum adequate: 100Ah AGM or lithium plus 120W solar. The daily drive recharges via the alternator or DC-DC charger. Solar covers what overnight fridge use took. Most mid-range Kampi listings with solar mentioned will handle this without issue.
You need 100Ah lithium (or 200Ah AGM) plus 200W solar and an MPPT controller. With 200W in SA sun, you generate more Ah per day than the fridge consumes, so the battery tops up daily even without driving.
Minimum: 200Ah lithium plus 200W solar and MPPT. At 40°C+ ambient, a 60L fridge can draw 35 Ah or more per day. You need the solar surplus and the battery buffer for overcast days. If the listing does not mention lithium and 200W of solar, ask the owner before committing to a week off-grid in the Kalahari.
Search Kampi for off-road trailers and compare the listing descriptions. The information you need is usually there. You just have to know what you are looking for.
Once you have a well-spec'd trailer, a few habits on arrival will protect the power budget for the full trip:
EcoFlow, Jackery, Rentech and similar portable power stations are increasingly appearing in Kampi listings, either as the main power source or alongside a traditional battery setup. They are simple to use, safe indoors, and can charge from a campsite plug, a solar panel, or a car's 12V socket.
For weekend campers at semi-developed sites, they work well. For longer off-grid trips: most portable stations offer 500-2,000 charge cycles compared to 3,000-5,000 for quality LiFePO4 batteries, and charging efficiently from a vehicle alternator while driving needs extra hardware. For a couple of nights at a farmstay, fine. For a week in the Northern Cape without power points, a proper battery-solar-DC-charger setup is still the right tool.
A 60L fridge draws 20-30 Ah per day in typical SA summer conditions, and up to 35 Ah on very hot days. A 100Ah AGM gives you roughly 50 usable Ah overnight. A 200W solar panel in good SA sun replaces that and more in a single day. An MPPT controller makes the most of whatever sun you have.
Before you book, ask the owner four questions: battery Ah and type, solar wattage, controller type (PWM or MPPT), and whether there is a split-charge system for driving. The dead battery at breakfast is almost always a failure of pre-trip questions, not bad luck.
For everything else to prepare before departure, read the full 4x4 camper trip checklist. If you are still weighing whether to rent or own, the renting vs buying guide covers the honest numbers. And if this is your first rental, renting before you buy explains what a single trip teaches you that no amount of YouTube research does. Over 5,800 trips have gone through Kampi so far. Most of the lessons are already in the listings, if you know where to look.