The short answer

Longer than you think - if your setup matches how you actually travel.

The longer answer is where most people get caught out.

Why "days off-grid" is the wrong question

Most owners ask:

“How many days can I stay off-grid?”

The better question is:

“How much power do I use per day - and how reliably can I replace it?”

Off-grid capability is a daily balance, not a countdown timer.

Typical daily power use (realistic)

For an off-road caravan used properly:

• Fridge: 40-70Ah/day
• Lights, water pump, fans: 10-20Ah/day
• Device charging & accessories: 10-30Ah/day
• Inverter use (coffee machine, microwave): highly variable

Most travellers sit between 70-120Ah per day.

Battery capacity vs usable capacity

A common trap is assuming battery size equals usable power.

• Lithium batteries offer ~80-90% usable capacity
• AGM batteries offer ~50% usable capacity

A "200Ah" battery bank does not mean 200Ah of freedom.

Solar helps - but it’s not guaranteed

Solar works brilliantly when:

• You’re stationary
• You have sun
• Panels are clean and unshaded

Solar struggles when:

• It’s overcast
• You’re driving through trees
• You’re relying on it to recover heavy inverter use

Solar is a top-up system, not a miracle.

What actually extends off-grid time

• Conservative inverter use
• Matching fridge size to battery capacity
• Understanding seasonal sun differences
• Charging while towing properly

The longest-lasting setups aren't the biggest - they’re the best balanced.

The takeaway

Off-grid success isn’t about bragging rights. It’s about understanding limits before they catch you out.