The Honest Answer
Introduction
A generator is one of those polarizing items that campers can be quite passionate about. Some people hate them, while others appreciate the convenience when their battery levels start getting low.
Like anything, their use can be annoying to others, so a bit of common sense is definitely required.
Whether you need a generator comes down to a few simple questions:
- How much power do you use in a normal day?
- How much battery capacity do you have?
- How much charging capacity do you have?
- How reliable is that charging in different conditions?
There is no one-size-fits-all answer. Some travelers can go for long periods without a generator because their system easily keeps up with their daily use.
Others will need another way to recharge, especially if they spend extended time off-grid or run into poor weather where solar simply can’t keep up.
The Reality on the Road
The problem with power planning is that the weather does not always cooperate, and neither does your campsite.
We recently did a stretch of off-grid camping where it was overcast for four days straight. That is the kind of situation that quickly shows whether your solar system is enough on its own.
Trees are another big factor. You can be parked in a great spot, but even partial shade can reduce your solar output dramatically. In some cases, it is not much better than a cloudy day.
In our case, we use around 140Ah over a typical 24-hour period. That is not from doing anything unusual, it is simply the reality of living in the van full time. Our daily use includes a compressor fridge, Starlink, laptops and charging gear, lights, fans, the water pump, TV, and some inverter use.
Portable solar panels definitely help. On a good sunny day we can generate around 35+ amps, but that only really happens for a few hours in the middle of the day, maybe four to five hours when conditions are right.
Below is a typical morning reading after a normal night of use, including TV, charging devices, laptop use, and Starlink.
Batteries buy you time, solar keeps you going.
If your solar can easily keep up with what you use, you are fine. If it cannot, then sooner or later you will need another way to recharge, whether that is shore power, driving, or a generator.
Our Example
We have 400Ah of lithium battery capacity. The caravan has 600W of solar on the roof, plus a 200W portable panel. It is a modest setup, but not the most powerful system around.
On paper, 600W of solar can look like around 50 amps. In reality, once you allow for charging voltage, heat, panel angle, and normal losses, seeing something in the mid 30 amp range is more typical.
Portable panels can often perform better than roof panels because they can be angled towards the sun and moved out of shade.
In poor weather, we might only see around 15 amps of charge. At that rate, there simply are not enough daylight hours to replace what we use.
In good conditions, we can see around 35+ amps, which makes a big difference. Even then, it depends on how many hours of useful charging we actually get.
That is why solar figures on paper and solar performance in the real world can be very different.
Why The Maths Matter
A simple way to look at it:
- Use: 140Ah per day
- Solar input (overcast, trees): 100Ah to 130Ah
That leaves a shortfall of around 10Ah to 40Ah per day.
On the battery monitor, that might look something like this:
- End of day one: ~92%
- Start of day two (morning): ~72%
- End of day two: ~86%
- Start of day three (morning): ~66%
- End of day three: ~80%
- Start of day four (morning): ~60%
Each day you recover a bit during sunlight hours, but not enough to get back to where you started. Then overnight use pulls you down further again.
It does not sound like much at first, but over several days it adds up quickly.
You can also get into a situation where, even if the weather improves, there are simply not enough daylight hours left in the day to fully recover, you will need several good days to get fully charged up.
This is where a generator starts to make sense, not because you are using excessive power, but because conditions can leave you running at a steady deficit.
And once the battery gets too low, the problem is no longer theoretical. In our case, with a compressor fridge, running out of power is not just inconvenient, it means losing all the food in the fridge as well.
Batteries Size Helps, But It Doesn’t Fix The Problem
Larger batteries are useful because they give you more buffer.
If your system is slowly falling behind, that extra capacity will buy you extra days, how many days depends on how big the shortfall is. But unless you are putting enough charge back in, a bigger battery is only delaying the inevitable.
A power system needs to be looked at as a whole:
- Battery capacity
- Solar input
- Charger size
- Daily usage
- Weather and conditions
Charging Limits Matter Too
Even when you do have access to charging, it still takes time, especially with a large battery capacity.
We have a 40A AC charger on shore power and a 40A DC/DC charger while towing and for solar. Neither is instant. If the batteries are very low, it can take many hours to recover.
Solar is no different. Output depends on:
- Sun strength
- Panel angle
- Shade and trees
- Cloud cover
- Charger capacity
Winter makes this harder again. The sun is lower, weaker, and the usable charging window is shorter.
Trees are another big factor. Even a good system can struggle badly if you are camped in shade for most of the day.
This is where portable panels can help. Being able to move and angle them towards the sun can make a noticeable difference compared to fixed roof panels.
So Do You Need A Generator?
Maybe –
The simplest way to work it out is to test your own setup, how much power you use, and how easily your system can replace it.
This can be done anywhere, even in a caravan park. Just unplug from shore power and see how your system performs over a day or two. Try it in less-than-ideal conditions as well, overcast weather or when parked under trees.
It will not take long to get a feel for how your system behaves.
If things go downhill quickly, you can always plug back in and recharge.
So To Sum Up –
You are more likely to need one if:
- You free camp or stay off-grid for extended periods
- Your solar does not have much spare capacity
- You often camp in shaded areas
- You rely on constant loads like a fridge, Starlink, or devices
- You want a backup rather than being forced into a caravan park
You may not need one if:
- Your daily power use is low
- Your solar comfortably replaces what you use
- You mostly stay in powered caravan park sites
- You move often enough for charging to keep up
- You are happy to reduce usage when conditions are poor
Final Thoughts
A generator is not essential for every traveler, but for some setups it makes life much easier, it gives you that peace of mind knowing you have another option at hand.
For us, our generator has saved us a couple of times each year on the road, mostly due to bad weather.
We work from the caravan, so things like the inverter, Starlink, and laptops need to be running consistently. When the solar can’t keep up, having that backup makes a big difference.
The real question is not whether generators are good or bad, it is whether your system can reliably keep up with how you travel.
If your power use is modest and your solar easily keeps up, you may never need one.
If your setup regularly falls behind during cloudy weather or long off-grid stays, then a generator becomes a practical backup.
In the end, it comes back to knowing your own numbers. Once you understand how much you use and how much you can realistically replace, the answer becomes much clearer.
Thanks for reading Do I Need A Generator for Caravan Travel?. Shadow, the van, and the two of us will catch you at the next campsite.
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