Solar vs. generator: which one actually saves you money?
The generator wins on day one — it's cheaper to buy. But backup power isn't a one-day purchase. Run the numbers over five years and the picture flips completely.
The trap of the low sticker price
A household generator might cost $400–$1,200 to buy — far less than a solar system. That's where the generator's advantage ends, because from the moment you start it, it begins charging you rent:
- Fuel — during heavy load shedding, a family generator can easily consume $100–$300 of petrol or diesel per month.
- Servicing — oil changes, filters, spark plugs, repairs. Small amounts that never stop.
- Replacement — cheap generators worked hard rarely survive past a few years. Then you buy again.
- The costs nobody invoices — noise complaints, fumes, queuing for fuel, and the security risk of storing it.
A simple five-year comparison
Take a family that experiences regular outages and runs backup power most evenings. Illustrative numbers:
| Cost over 5 years | Generator | Solar system |
|---|---|---|
| Upfront purchase | $800 | $3,500 |
| Fuel (avg. $120/month) | $7,200 | $0 |
| Servicing & repairs | $600+ | Minimal |
| Replacement unit | $800 (likely) | $0 |
| Five-year total | $9,400+ | ~$3,500 |
Illustrative figures — your fuel usage and system price will differ. The pattern, however, holds across almost every real case we assess.
And at the end of those five years? The generator owner has receipts. The solar owner has a system with 15+ years of life still ahead of it.
Where a generator still makes sense
We're engineers, not salespeople, so here's the honest version: generators still have a place. If you need backup power a few times a year, or you run heavy machinery in short bursts, a generator can be the rational choice. Some businesses run a hybrid setup — solar for daily power, a generator held in reserve for rare extreme events. We design those too.
Rule of thumb: if you're using backup power more than a few hours a week, solar almost certainly costs you less over time. The more load shedding you experience, the faster solar pays for itself.
The part money can't measure
Ask anyone who has switched: the biggest change isn't financial. It's silence. No engine roaring at dinner. No fuel runs at night. No wondering if the freezer made it. The power cut happens somewhere out there on the grid — and inside your home, nothing changes at all.
Want the numbers for your situation?
Bring us your current fuel spend and we'll show you, honestly, what solar would cost and when it breaks even for you specifically. If a generator genuinely suits you better, we'll say so.