Solar-Powered Oxygen Delivery (SPO2)
Dr. Michael Hawkes
Solar-powered oxygen delivery system.
The solar-powered oxygen delivery (SPO2) system consists of a commercially-available oxygen concentrator, charge controller, battery bank, and solar panels to provide medical-grade oxygen from ambient air without the need for reliable grid access. The systems are custom designed by Dr. Michael Hawkes at the University of Alberta and his team for each location and can switch between grid connectivity to battery power as necessary during power outages.
This product was selected for inclusion in WHO’s 2021 Compendium of Innovative Health Technologies for Low‐Resource Settings.
Solar oxygen currently partners with local suppliers, contractors, and development agencies to build and implement the systems.
Goal 3: Good health and well-being
Trained medical professionals with the need for medical grade oxygen delivery in locations without reliable access to electricity or oxygen supply chains.
System components are commercially available with custom system design and implementation provided by Solar Oxygen.
Available through direct sales by contacting Solar Oxygen.
As of October 2020, fewer than 100 units have been distributed.
List or none.
Continuous, Recharging only, None, Other
The solar-powered oxygen delivery system converts ambient air into medical-grade oxygen using commercially available oxygen concentrators, charge controllers, battery banks, and solar panels. This system, customized for each location of implementation, collects solar energy during the day through solar panels and stores excess power in batteries (72 hours of power at full charge). Through this system, oxygen is produced, drawing power from the grid when possible and switching to solar/battery during outages.
Locally trained technicians
Filters and sieve beds are available separately.
The manufacturer specified performance targets include reliability, affordability, flexibility, ease of use, and maintenance.
An initial pilot and randomized control trial at two sites in Uganda provided a proof-of-concept and met the criteria for noninferiority to traditional cylinder oxygen supplied. Initial results from scaling up the solar oxygen system to 20 health centers have shown a 58% reduction in mortality with a cost of 29 USD per disability-adjusted life year (DALY).
Filters should be replaced every 1-2 months, and sieve beds should be replaced every 6 months for the oxygen concentrator. The battery bank should be installed such that it cannot be tampered with and will be protected from potential damage.
Filters and sieve beds
Duke T., et al. 2010, Oxygen is an essential medicine: a call for international action. Int J Tuberc Lung Dis, Vol. 14(11), pp. 1362-1368.
Duke T., Wandi F., Jonathan M., et al., 2008, Improved oxygen systems for childhood pneumonia: a multihospital effectiveness study in Papua New Guinea. Lancet, Vol. 372(9646), pp. 1328-1333. doi:10.1016/S0140-6736(08)61164-2
Turnbull H., et al., 2016, Solar-powered oxygen delivery: proof of concept. Int J Tuberc Lung Dis, Vol. 20(5), pp. 696-703. doi:10.5588/ijtld.15.0796
Hawkes M.T., et al., 2018, Solar-Powered Oxygen Delivery in Low-Resource Settings: A Randomized Clinical Noninferiority Trial. JAMA Pediatr, Vol. 172(7), pp. 694-696. doi:10.1001/jamapediatrics.2018.0228
Conradi N., et al., 2019, Solar-powered oxygen delivery for the treatment of children with hypoxemia: protocol for a cluster-randomized stepped-wedge controlled trial in Uganda. Trials, Vol. 20(1), pp. 679. doi:10.1186/s13063-019-3752-2
The system components (solar panels, charge controllers, batteries, concentrators) are commercially available and compliant with existing regulatory standards.
The system has been evaluated for cost and performance relative to traditional oxygen cylinders.
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