By premises
Solar for a clinic or hospital
Partly, and the design question is different from every other premises: some loads here must not stop. Vaccine refrigeration, oxygen concentrators and lighting in a treatment room are not comfort loads, so the system is designed around guaranteed continuity rather than around payback.
Last reviewed
Design from the critical list first
Before sizing anything, write down what genuinely cannot lose power: the cold chain, any concentrator or monitor in use, treatment-room lighting, and the systems holding patient records. That list, not the building's total consumption, determines the battery. Everything else is an ordinary economic decision.
The cold chain is the unforgiving load
Vaccine and medicine refrigeration has to hold temperature continuously, and a lapse is a loss of stock and of trust. It is a modest continuous load, which makes it well suited to battery backup, but it needs the backup to be genuinely reliable rather than nearly reliable. Size for the worst outage, not the average one.
Solar alongside existing backup, not instead of it
Most clinics already have a UPS or a generator. Hybrid solar sits alongside them: it carries the critical circuit silently through routine load-shedding and reduces generator run hours sharply, while the generator remains for the rare long outage or heavy load. Removing existing backup entirely is rarely the right advice for a clinic.
A daytime load that suits the array
Consulting hours are daylight hours, so lighting, fans, cooling and diagnostic equipment are consumed live. That makes the on-grid part of the economics good in its own right, quite apart from the continuity case that justified the battery.
Can solar power a clinic through load-shedding?
Can I rely on solar for medical refrigeration?
With a properly sized battery and a system that has been tested under a real outage, yes — and it is one of the better applications for storage because the load is modest and continuous. What it must not be is untested. Insist that the changeover is proven by pulling the mains at handover, not assumed.
Should I keep the generator?
For most clinics, yes. Solar with storage handles routine load-shedding silently and cuts generator hours dramatically, but a long outage or a heavy load is still a generator's job. The right outcome is a generator that rarely runs, not one that has been sold off before the first difficult week.
How much backup time should I design for?
Longer than your typical outage, because the worst case is what the critical list exists to survive. Take your area's actual outage pattern in the season it is worst, not the annual average, and size the critical circuit against that. This is the same discipline as sizing any bank, applied to a load where failure costs more.
Rather have it done?
On-grid is cheapest and dies with the grid. Off-grid runs independently but needs a battery bank sized for the worst week of the year. Hybrid does both and is what most Islamabad households actually want. Choosing between them changes the price more than any other decision on a solar quote.
On-grid, off-grid and hybrid solar systems in Islamabad — prices and scope