How long will an EcoFlow DELTA Pro Ultra run incandescent Christmas tree lights (500 bulbs)?
About 20 hours — 19 h 30 min typically, from 18 h 21 min in the worst case to 20 h 39 min at best. That assumes incandescent Christmas tree lights (500 bulbs) pulling 204 W continuously, plus the station's 25 W AC mains socket overhead — 229 W in total out of 4,465 usable watt-hours.
The old bulbs draw about six times what LEDs do for the same tree, and run hot.
The numbers
| Setup | Average draw | Cautious | Typical | Best case |
|---|---|---|---|---|
| 1 × incandescent Christmas tree lights (500 bulbs), UK 230 V | 229 W | 18 h 21 min | 19 h 30 min | 20 h 39 min |
| 2 × incandescent Christmas tree lights (500 bulbs), UK 230 V | 433 W | 9 h 43 min | 10 h 19 min | 10 h 55 min |
| 1 × incandescent Christmas tree lights (500 bulbs), US 120 V | 229 W | 18 h 21 min | 19 h 30 min | 20 h 39 min |
- 2.4 nights of eight hours, or 0.81 days of continuous running.
- Usable energy: 4,465 Wh of the 6,144 Wh on the box, after chemistry, inverter losses and the reserve.
- To keep it going for a full 24 hours you would need about 7,562 Wh of rated capacity — 1.2× this station.
- Start-up: the incandescent Christmas tree lights (500 bulbs) asks for 204 W at switch-on against this station's 11,200 W (230 V) / 14,400 W (120 V) peak — comfortable.
Buy the EcoFlow DELTA Pro Ultra
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What changes the answer
| If instead… | Typical runtime | Change |
|---|---|---|
| The pack is two years old | 17 h 56 min | -8% |
| The pack is five years old | 15 h 36 min | -20% |
| It is −10 °C outside | 16 h 34 min | -15% |
| You run it flat, no reserve | 21 h 40 min | +11% |
| You keep 20% back | 17 h 20 min | -11% |
If you need it to run longer
Nothing in this catalogue runs incandescent Christmas tree lights (500 bulbs) for twice as long as the EcoFlow DELTA Pro Ultra. Either it is already near the top of the range, or this appliance is beyond what portable batteries do well — see the incandescent Christmas tree lights (500 bulbs) page for the full ranking.
Smaller options that still work
| Station | Wh | Typical | Weight | Indicative price |
|---|---|---|---|---|
| Jackery Explorer 5000 Plus | 5,040 | 16 h 30 min | 61 kg | — / $3,499 |
| Zendure SuperBase V4600 | 4,608 | 14 h 57 min | 53 kg | £2,999 / $4,999 |
| EcoFlow DELTA Pro 3 | 4,096 | 13 h 17 min | 51.5 kg | £2,799 / $3,199 |
| Goal Zero Yeti PRO 4000 | 3,993 | 13 h 4 min | 52.5 kg | — / $4,000 |
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