DC-DC alternator charger
If you drive that day, charging is largely solved.
A DC-DC charger charges the power station from the car's alternator while you drive — far faster and more safely than a cigarette-lighter cable.
CampOFF
Why it is part of the system
On a road trip every hour driven is also a chance to charge. From a cigarette-lighter socket that barely works, and the car's starter battery is not protected either.
A DC-DC charger does not replace solar. It reduces what would otherwise have to come back from a panel or a socket after the driving days.
This is the one category we do not fit ourselves: we leave the automotive wiring to a professional. Practical testing of our own alternator charging is next.
What is it for?
Charging on the move. MPPT versions also take a solar input, so alternator and panel arrive in one box.
Who is it for?
It suits you if you move a lot: off-road, van life, longer trips with a dog or children. For a stationary weekend it is not enough on its own — that is what solar answers.
How to choose
- Charge current (A) and power (W): this decides how much an hour of driving puts back.
- MPPT: whether you also want a solar input in the same device.
- Dual input: alternator and solar at once, with priority handling.
- Battery type: LiFePO4, AGM, GEL or lead-acid — has to match the DIP switch setting.
- Installation: this is the one category that needs automotive electrical wiring.
Key technical criteria
- Charge current
- 15 A – 40 A
- DC charging power
- 350 W – 580 W
- MPPT solar input
- yes
- Dual input
- yes
- Battery types
- LiFePO4, AGM, GEL, lead-acid
Recommended models
C30AMPPT
DC–DC charger with MPPT – 350 W / 30 A
Charges from the alternator and from solar, with two inputs. The entry level for charging on the move.
Currently unavailable
Details on CampOFF →C40A
DC–DC charger – 520 W / 40 A
Alternator input only, but faster: one or two hours of driving a day already means a real top-up.
€105.99EU reference price
Last price check: 23 August 2026
C40AMPPT
DC–DC charger with MPPT – 520 W / 40 A
The complete package: alternator plus solar in one box, at 40 A charging current. The default for nomads travelling by car.
€113.99EU reference price
Last price check: 23 August 2026
FAC580
FAC580 DC–DC car charger
Recommended on specifications – not tested by us in person
Fast charging while you drive. The power you can actually use depends on the station's own input limit.
€199.00EU reference price
Last price check: 29 August 2026
Price observed in the EU shop of the partner selling this product. Local prices may differ — always check the current price in the shop. Where there is no official local price, we convert the EU reference price at the Hungarian National Bank's official rate for the day, rounded up. This is an estimate, not the shop's price — the partner shop bills in its own currency. Purchase links go live once each partner programme is approved, brand by brand. Until then this page is information only.
Which one should I pick?
30 A / 350 W: for 1–3 hours of driving a day and a smaller system. 40 A / 520 W: when you need 600–1000 Wh back per day. An MPPT version pays off if you also use solar.
Commonly used together
A DC-DC charger connects the two ends of the system:
Matching bundles
Roadtrip
Power station + solar + DC-DC charger + fridge — the classic road-trip set.
- Estimated daily consumption
- 620 Wh
- Autonomy
- Energy balance expected
4 items· €887.69
Digital Nomad
Power station + solar + DC-DC + fridge — sized for work.
- Estimated daily consumption
- 900 Wh
- Autonomy
- Energy balance expected
4 items· €1,052.78
Off-grid Pro
Large capacity, solar, charging on the move and outdoor gear.
- Estimated daily consumption
- 1400 Wh
- Autonomy
- 15.8 days
4 items· €1,479.69
Roadtrip – with a stronger inverter
The same road-trip need with more capacity and an inverter that also starts a kettle, from a single shop.
- Estimated daily consumption
- 620 Wh
- Autonomy
- Energy balance expected
3 items· €877.00
Digital Nomad – with more capacity
The same working day from the car, with twice the storage — enough for two overcast days.
- Estimated daily consumption
- 900 Wh
- Autonomy
- Energy balance expected
3 items· €1,317.00
Off-grid Pro – expandable version
The same long stretch off the grid, in a system that grows from 3840 Wh to 11.5 kWh.
- Estimated daily consumption
- 1400 Wh
- Autonomy
- Energy balance expected
3 items
This set is not fully available right now. For the same need we recommend this complete alternative system: Off-grid Pro
Built for
Off-road
Where the road ends, your own power supply begins.
Details →Digital nomad by car
Make the car an office too — with stable power and internet.
Details →Travelling with a dog
For them, cooling is not a comfort question.
Details →With children, as a family
More people, more devices, more energy — but it need not be complicated.
Details →Not sure how big a system you need?
Tell us what you are taking and how many days you spend off-grid. We will tell you how much storage and how much solar is enough — and when a smaller system already covers it.
⚡ Work out what system I needQuick facts and common questions
Charging on the move. MPPT versions also take a solar input, so alternator and panel arrive in one box. 30 A / 350 W: for 1–3 hours of driving a day and a smaller system. 40 A / 520 W: when you need 600–1000 Wh back per day. An MPPT version pays off if you also use solar.
- Recommended models: 4
- Charge current
- Continuous AC output
Frequently asked questions
What is it for?
Charging on the move. MPPT versions also take a solar input, so alternator and panel arrive in one box.
Who is it for?
It suits you if you move a lot: off-road, van life, longer trips with a dog or children. For a stationary weekend it is not enough on its own — that is what solar answers.
Which one should I pick?
30 A / 350 W: for 1–3 hours of driving a day and a smaller system. 40 A / 520 W: when you need 600–1000 Wh back per day. An MPPT version pays off if you also use solar.