Description
Quick answer: This is the genuine ResMed DC/DC adapter (car adapter) for the Astral 100 and Astral 150 ventilators (part 27925) — it lets you run the Astral from a 12V–24V DC source (such as a vehicle cigarette-lighter socket) when AC mains power isn’t available, and it charges the ventilator’s internal battery at the same time. It’s the way to power an Astral in a car, RV, or boat, or from a compatible DC supply. Important: this is a life-support ventilator power accessory with specific safety requirements (negative-ground systems only, oxygen handling, start the vehicle first) — read the user guide and follow your clinical team’s guidance. Astral series only.
Important — life-support power accessory (read the safety notes)
This adapter powers a life-support ventilator. Correct, uninterrupted power is critical, so ResMed’s warnings must be followed. Key points from the user guide:
- Astral series only — use this adapter only with Astral 100 / 150 ventilators.
- Negative-ground 12–24V systems only — it’s intended for negative-ground vehicles (negative battery terminal grounded). Using it on a positive-ground system may damage the Astral and the vehicle’s electrical system. If unsure, check the vehicle manual.
- Start the vehicle first — always start the car before plugging in the Astral.
- Low-voltage cutover — if the external DC source drops below 11V, the Astral switches to its internal battery.
- Supplemental oxygen — if using oxygen with the Astral, turn the oxygen off before connecting or disconnecting the adapter, and only use oxygen in a well-ventilated area.
- Do not touch the connections at the back of the Astral while using the adapter; do not connect the car battery to an AC charger while the adapter is connected; do not modify the adapter (no user-serviceable parts).
Always follow the Astral DC/DC Adapter user guide and the patient’s clinical care plan. This listing is informational and is not medical advice.
What’s included
- 1 × ResMed Astral DC/DC adapter (car adapter, part 27925)
Astral ventilator and DC source not included.
About this part
The Astral ventilators run on AC mains (via the AC power supply) or on battery — and this DC/DC adapter adds a third option: running the device from a 12V–24V DC source, most commonly a vehicle cigarette-lighter socket. It plugs directly into the DC socket and powers the Astral while charging the ventilator’s internal battery, so it’s the go-to for keeping an Astral running (and topped up) during travel, transfers, or anywhere without mains power — car, RV, boat, or a compatible DC supply.
Battery notes: when powered from the adapter, the Astral’s internal battery charges. The adapter does not charge the Astral External Battery directly through the device — though the external battery can itself be charged using this DC adapter as its power source (per the external-battery documentation). If in doubt about a specific battery setup, follow the Astral guides or contact us.
The vehicle’s electrical system must be in good condition; if unsure, have it checked by an auto electrician.
Key features
- Genuine ResMed Astral DC/DC adapter (27925) — the correct DC/car adapter for the Astral.
- Runs the Astral from 12–24V DC — vehicle socket or compatible DC source.
- Charges the internal battery while powering the device.
- For travel, transfers, and off-mains use — car, RV, boat.
- Astral 100 / 150 only — with important safety requirements (see above).
Specifications
| Specification | Detail |
|---|---|
| Product type | DC/DC power adapter (car adapter) |
| Compatible device | ResMed Astral 100 / 150 ventilators — only |
| Model | DC-90A01 |
| Input / output | 12V–24V DC (≈7.5A/3.75A) |
| Function | Powers the Astral from DC; charges the internal battery |
| System requirement | Negative-ground 12–24V systems only |
| Low-voltage behavior | Below 11V, Astral switches to internal battery |
| Oxygen | Turn oxygen off before connect/disconnect |
| Included | DC adapter only |
| Not included | Ventilator, DC source |
| Related | Astral AC adapter · external battery (27919) · power cord kit (27943/27967) |
| Prescription | Clinician-directed (life-support accessory) |
| ResMed reference / SKU | 27925 |
| Brand | ResMed |
Frequently asked questions
What does it do?
It powers the Astral 100/150 from a 12V–24V DC source (like a car cigarette-lighter socket) when AC mains isn’t available, and charges the ventilator’s internal battery.
Which devices does it work with?
Only the ResMed Astral 100 and Astral 150 ventilators.
Can I use it in any vehicle?
Only on negative-ground 12–24V systems. A positive-ground system can damage the Astral and the vehicle. Check the vehicle manual if unsure, and always start the vehicle before plugging in the Astral.
Does it charge the battery?
It charges the Astral’s internal battery while powering the device. (The external battery can also be charged using this DC adapter as its source.)
What happens if the vehicle voltage drops?
If the external DC source falls below 11V, the Astral switches to its internal battery.
I use supplemental oxygen — anything to know?
Turn the oxygen off before connecting or disconnecting the adapter, and use oxygen only in a well-ventilated area.
Do I need a prescription?
This is a life-support ventilator accessory used under clinical direction. Contact us to confirm requirements.
How is it delivered?
Given the clinical nature of ventilator accessories, please contact us to confirm availability and delivery options.
This is a power accessory for a life-support ventilator. Follow the Astral DC/DC Adapter user guide and the patient’s clinical care plan. Use only with Astral ventilators on negative-ground 12–24V systems. This listing is informational and is not medical advice.
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