Solar Generator for CPAP: Best Options with UPS Mode 2026

Short answer: Yes — and solar generators are ideal for CPAP backup. A CPAP uses 30-60W with no surge requirement. Even a 500Wh generator runs a CPAP for 8-16 nights. The critical requirement is UPS mode — the generator must switch to battery in under 30ms so the CPAP doesn’t detect a power interruption and reset. The EcoFlow DELTA 3 Classic ($449) is the best budget option.

Why UPS Mode Is Essential for CPAP

Most CPAP machines reset when they detect a power interruption longer than 30ms. Without UPS mode, the brief gap when a generator switches to battery will cause the CPAP to stop mid-night, potentially triggering an alarm. With UPS mode, the switchover is imperceptible — under 30ms — and the CPAP never detects the interruption.

Nights Per Charge by Generator

Generator	Usable Wh	CPAP nights (typical)	CPAP nights (best)	UPS?	Price
EcoFlow DELTA 3 Classic	900 Wh	24 nights	27 nights	✓	$449
VTOMAN FlashSpeed 1500	1,548 Wh	41 nights	47 nights	✓ <20ms	$629
EcoFlow DELTA 3 Max	1,800 Wh	48 nights	55 nights	✓	$749
EcoFlow DELTA Pro	3,200 Wh	85 nights	98 nights	✓	$2,499

Assumes 8-hour sleep, 40W CPAP average without heated humidifier. With heated humidifier: reduce nights by ~50%.

BiPAP and Oxygen Concentrators

BiPAP machines use 100-200W — approximately 3-5× more than CPAP. A 1,800Wh generator (DELTA 3 Max) runs a BiPAP for 10-20 nights. Oxygen concentrators use 150-300W and have no surge requirement — the EcoFlow DELTA 3 Max runs a 3L concentrator for approximately 5-7 nights per charge.