Solar powered medical devices matter most where the grid is weak or absent. In health facilities without reliable electricity, lights go out during births, vaccines can spoil and oxygen concentrators stop. Solar panels with battery or ice storage keep this equipment running, and that is where the evidence is strongest: lighting, vaccine cold chains and oxygen in clinics in low-income regions. In the UK, the best-known example is a hospital solar farm built to cut running costs.
Some makers market solar ventilators or solar X-ray machines, but we found no verified, deployed product of either kind, so they are not covered here as established technology.
How it works
Solar direct drive (SDD) vaccine fridges are wired straight to a solar array with no external battery. Instead, as Gavi puts it, they use “a back-up battery made of ice” to keep vaccines cold overnight and in cloudy weather. The WHO’s equipment standards (PQS category E003) include solar direct drive fridges.
For small clinics, the Solar Suitcase is a well-documented example of a portable system. It combines a solar panel, a lithium iron phosphate battery and several output ports in a wall-mounted case. It powers LED task lights, headlamps and a fetal Doppler, so staff can work after dark.
Researchers have also looked at biocompatible power sources for medical devices, specifically implants. One line of work studies whether a solar cell under the skin could harvest enough light to run a pacemaker.
Real-world examples
Solar Suitcases in sub-Saharan Africa
We Care Solar is a nonprofit based in Berkeley, California. The organisation says field research in Nigerian hospitals in 2008 showed that reliable electricity was crucial for life-saving obstetric care, which led to the Solar Suitcase.
In October 2025 the organisation said it had delivered Solar Suitcases to over 10,000 health clinics in sub-Saharan Africa. The third-generation model, as described by pv magazine USA, includes a 100 W monocrystalline PV panel, a 12 V, 20 Ah lithium iron phosphate battery (at least 240 Wh), four LED task lights, DC and USB sockets, two rechargeable headlamps, a fetal Doppler and a battery charger.
The maker says four lights run for 12 hours on high or 60 hours on low, and that the system can provide light for 10+ years with servicing and one battery replacement. The charity reports a 5–30% increase in deliveries and antenatal care visits after installation. Under its “Light Every Birth” programme, it says it reached every health facility in need in Liberia (2019), Zimbabwe (2022), and Uganda and Sierra Leone (2024).
Solar vaccine fridges
Gavi, the Vaccine Alliance, runs the Cold Chain Equipment Optimisation Platform (CCEOP). In June 2023 Gavi said the platform had installed more than 66,000 fridges, around 60% of them solar powered, and estimated that they avert about 7,000 tonnes of CO2 a year. For the wider off-grid cold chain, see solar-powered ice makers.
Wales has a link to this field. Sure Chill of Tywyn uses water’s density at 4 °C to keep vaccines cold for “days or even weeks” without power. According to the Welsh Government in 2017, the Gates Foundation had awarded it $1.4m to develop a vaccine cooler and its fridges were operating in more than 30 countries. We could not confirm its current status.
Solar oxygen trials
In Uganda, two systems in which solar panels and batteries run an oxygen concentrator, instead of relying on delivered cylinders, were installed in Jinja and Kambuga in 2014. A randomised trial published online in JAMA Pediatrics on 14 May 2018, compared them with cylinders in 130 children under 13 with hypoxaemic illness (65 per group) at two hospitals.
Median hospital stay was 4.1 days with solar oxygen and 4.5 days with cylinders, within the trial’s non-inferiority margin of one day. In-hospital deaths were 11 (17%) in the solar group and 8 (12%) in the cylinder group; the difference was not statistically significant. The authors concluded that solar-powered oxygen delivery is non-inferior to cylinder delivery. It does not show that solar oxygen saves more lives. A larger trial across 20 Ugandan facilities was published as a protocol in 2019; we did not find its results.
UNDP Solar for Health
UNDP says it has supported solar electrification of more than 1,000 health centres and storage facilities in 15 countries, funded mainly by the Global Fund. Its largest programme, in Zimbabwe, began in 2016; in October 2024 a handover of 1,044 solar systems at health facilities, with a combined capacity of over 11 MW, was announced.
Solar sterilisation
Researchers in Naomi Halas’s lab at Rice University developed a solar steam steriliser that uses light-absorbing nanoparticles to turn water directly into steam. Published in PNAS in 2013, the team said up to 80% of sunlight energy is converted into heat; one report put overall system efficiency at 24%. Set-ups were shown for sterilising instruments and, with Gates Foundation funding, sanitising human waste. It remains a research prototype; we found no evidence of a commercial product.
Solar power for implants
A study from the University of Bern and Bern University Hospital and published in Annals of Biomedical Engineering in early 2017, measured how much light reaches under the skin. Thirty-two volunteers wore light-measuring devices under filters that simulate skin, for a week each in summer, autumn and winter. The researchers found a 3.6 cm² solar cell under the skin could produce enough power for a typical pacemaker (5–10 microwatts) in every season. This is a feasibility study, not an implanted-device trial, and further work is needed to show such a device can cope with darkness at night and in winter.
What the numbers say
A report released on 14 January 2023 by the WHO, World Bank, IRENA and SEforALL found that close to 1 billion people in low- and lower-middle-income countries are served by health facilities with no electricity or unreliable electricity. The data come from surveys in 27 countries (2015–2022).
According to the WHO, 15% of facilities in sub-Saharan Africa have no electricity at all, as do at least 12% in South Asia and 8% in Latin America and the Caribbean. Only 40% of facilities in sub-Saharan Africa have reliable electricity, and only half of hospitals there. In Latin America and the Caribbean, 72% of facilities have reliable electricity on average.
The World Bank estimates that US$4.9 billion is urgently needed to bring health facilities in 63 low- and middle-income countries to a minimal or intermediate level of electrification. The WHO calls decentralised solar PV with batteries cost-effective, clean and quick to deploy, and notes that generators in facilities are often not working.
For solar oxygen, an economic evaluation by Huang, Mian and colleagues (data from January 2020 to February 2021) estimated about US$20 per disability-adjusted life year (DALY) averted compared with no oxygen, $26 per patient treated and $542 per life saved. It was cost-saving compared with diesel-generator-powered concentrators and cost $140 per DALY compared with grid-powered ones. These are model estimates with wide uncertainty ranges.
Limitations / honest assessment
Solar is not maintenance-free. We Care Solar’s “10+ years” figure assumes servicing and one battery replacement. In a remote clinic, that depends on spare parts being available.
The WHO also stresses maintenance: solar plus storage still needs trained technicians and spare parts. The burden shifts from fuel supply to technical upkeep.
Evidence on specific devices is uneven. Engineering for Change reports a “58% reduction in mortality” from scaling up solar oxygen, but we could not trace this to a peer-reviewed result, so it should not be relied on. The 2018 trial showed non-inferiority, not superiority.
Solar output is variable, so storage or backup is essential for critical equipment, and batteries add cost and another component that can fail. Many reach and outcome figures come from the organisations running the programmes, not independent evaluations.
The UK angle
In the UK, hospital solar is mainly about running costs and carbon. For how panels work in British conditions, see our guide to solar energy.
Castle Hill Hospital in Cottingham, run by Hull University Teaching Hospitals NHS Trust, has a solar farm of about 5 MW (it began as a 4 MW scheme), built between September 2021 and February 2022 for about £4.2 million. In May 2022 it produced about 26 MWh a day, with summer output expected to be roughly double, which the trust says covers the site’s daytime electricity needs. Output is lower in winter, as with all solar; see capacity factor. The trust estimated savings of about £250,000–£300,000 a month at 2022 energy prices; actual savings depend on prices and tariffs at the time.
Our live GB electricity mix shows solar’s share at any moment. Anyone considering solar for a smaller clinic or a home should note that costs and savings depend on the building and tariff, and should check current scheme rules on GOV.UK or with an MCS-certified installer.
Frequently asked questions
How many health facilities lack reliable electricity worldwide?
Close to 1 billion people in low- and lower-middle-income countries are served by health facilities with no electricity or unreliable electricity, according to a January 2023 report by the WHO, World Bank, IRENA and SEforALL.
What is a solar suitcase and what does it power?
A Solar Suitcase is a compact solar system made by the nonprofit We Care Solar: a 100 W panel, a lithium iron phosphate battery and a wall-mounted case. It powers LED task lights, headlamps, a fetal Doppler and phone or battery charging. The charity says it has reached over 10,000 clinics in sub-Saharan Africa (October 2025).
How do solar vaccine fridges work without batteries?
Solar direct drive (SDD) fridges are wired straight to a solar array with no external battery. They store cold as ice, which Gavi calls “a back-up battery made of ice”, to keep vaccines cold overnight and in cloudy weather.
Is solar-powered oxygen as safe as oxygen cylinders?
A 2018 randomised trial in Uganda found solar-powered oxygen non-inferior to cylinders on length of hospital stay. Deaths were 11 (17%) in the solar group and 8 (12%) in the cylinder group, a difference that was not statistically significant. The trial does not show solar oxygen saves more lives; its advantages are reliability and estimated cost.
Do any UK hospitals run on solar power?
Castle Hill Hospital in Cottingham has a solar farm of about 5 MW, built between 2021 and 2022 for about £4.2 million. The trust says it covers the site’s daytime electricity needs, and estimated savings of £250,000–£300,000 a month at 2022 prices.
Can solar cells power medical implants such as pacemakers?
Research from the University of Bern (2017) suggests a 3.6 cm² solar cell under the skin could produce enough power for a typical pacemaker in every season. It was a feasibility study, not an implant trial, and coping with darkness still needs to be shown.