Home & DIY
Is it cheaper to buy or rent a portable generator?
Break-even days to buy vs rent a portable generator — from daily hire rate, purchase price and how long you need it.
Quick answer
For a portable generator, break-even days ≈ purchase ÷ daily rent. At about €750 new and €45/day hire that is 16.7 days. A 3-day job costs ~€135 in hire — buy only if you will reuse, keep, or resell it.
Advanced settings
Recommendation
Rent — fewer days than break-even
Break-even (simple)
16.7 days
Rent for your project
35.00
Net buy cost (after resale)
$375.66
Cheaper option saves
$240.66
Daily rent is what the yard quotes before deposit and extras. Break-even ignores resale until you open advanced settings — use those if you plan to sell the tool after one job.
How it works
Adding up the watts on the labels is the easy half, and being roughly right there is fine. The number that strands you is the starting surge: anything with a motor — a compressor, a pump, a fridge, a big saw — pulls two to three times its running figure for the first second, so a generator sized on running watts trips the moment the load kicks in. Size it on the biggest single startup, not on the total. And whatever the maths says: it runs outside, never in a garage or a cellar, because the exhaust is what kills people, not the noise. Under 16.7 planned days the hire still wins; past that, a mid-range portable inverter generator starts paying for itself.
Hiring by the label is how a site ends up with power it cannot use. The machine usually arrives without distribution — no site board, no residual current protection, no cables of the right length and section — and those are exactly the parts that make the supply legal and safe to work from. Ask what is included before the day. One more point specific to hire: a large diesel run for weeks on a light load never reaches temperature and wet-stacks, which fouls it and can come back to you as a charge, so size close to the actual load rather than taking the biggest machine on the yard.
Frequently asked questions
When does buying a portable generator pay off vs renting?+
Break-even ≈ purchase ÷ daily rent: €750 ÷ €45/day ≈ **16.7 days**. Fewer → rent; more → buy if you will reuse or resell (tweak resale % in advanced settings).
How much does a portable generator hold its value?+
Good, and it spikes after every storm or blackout. Inverter models hold value best because they run sensitive electronics. Enter what you expect to recover in the advanced settings — it moves the break-even more than people think.
What is not included in the daily rate for a portable generator?+
Fuel, and you pay for what is missing from the tank on return. Size it honestly: a generator too small for the starting surge of a compressor or a pump is a wasted hire, not a cheaper one. Deposit and late-return penalties apply on top, as everywhere.
Is buying a portable generator online the same as hiring one?+
Online shops suit ownership. Hire includes deposit, delivery windows and return condition checks that a carton does not. If you need the machine for a few days only, price the all-in hire — not just the daily number — against a mid-range [[portable inverter generator|portable inverter generator]].
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