Solar Backup for Power Outages in Kenya
A solar system with storage keeps selected circuits running when the grid goes down. This is what a backup system actually does, how to decide what to keep on, and how battery size sets the cost.
What backup means in practice
A hybrid solar system sits between the grid and your building. While KPLC power is present it runs the building and charges the battery from the sun. When the grid fails, the inverter disconnects from the grid and continues to supply your circuits from the battery and whatever the panels are producing at that moment. The changeover happens in a fraction of a second, so equipment that would trip on a generator start keeps running.
The distinction that matters is between whole-house backup and essential-circuits backup. Backing up the entire building, including heavy loads, needs a large inverter and a large battery and costs accordingly. Backing up the circuits that actually hurt when they go off — lighting, internet, a fridge or freezer, a few sockets, a water pump — costs a fraction of that and covers most of what an outage disrupts.
Deciding what to back up
The question at survey is not how big your roof is but which loads must survive a blackout. A useful way to think about it is to separate loads into three groups: things that must never go off, things you would like to keep on, and things that can wait. A clinic's vaccine fridge and a business's point-of-sale belong in the first group; evening lighting and Wi-Fi in the second; a water heater or an iron in the third.
| Lighting, Wi-Fi, phone charging, TV | Small backup load |
|---|---|
| Fridge / freezer | Moderate, runs intermittently |
| Water pump | Short high-draw bursts |
| Office equipment, POS, CCTV | Moderate, continuous |
| Water heater, iron, cooker, AC | Heavy — usually left off backup |
Keeping heavy heating and cooking loads off the backup is the single biggest lever on cost. They can still run normally while the grid is up; they simply are not carried through an outage.
How battery size sets the cost
The inverter decides how much you can run at once; the battery decides how long you can run it. Backup duration is set by battery capacity, so the honest driver of a backup system's price is how many hours of autonomy you want. A modest essential-loads system might carry a few hundred watts of continuous load through an evening on a single 5kWh battery; doubling the hours means doubling the storage, and storage is the expensive part.
A practical approach for most homes is to size storage for the typical outage you actually experience, not the worst case imaginable. Panels recharge the battery each day, so a system sized for a normal evening outage will refill before the next one in most conditions.
Solar backup versus a generator
A generator is cheaper to buy and has no limit on run time while it has fuel. Against that, it needs fuel that must be bought and stored, it is noisy, it emits fumes, it requires servicing, and it does nothing for your day-to-day bill. A solar backup system costs more upfront, is silent and maintenance-light, runs automatically with no one present, and the same panels that provide backup also cut your KPLC bill every day the grid is up. Many businesses keep a generator for rare extended outages and use solar for daily savings and instant backup, rather than choosing one over the other.
Questions
Will solar power my whole house during a blackout?
It can, but whole-house backup needs a large inverter and battery and is expensive. Most homes back up essential circuits — lighting, internet, a fridge, a few sockets and a pump — which covers what an outage actually disrupts at a fraction of the cost. We define the backup circuits with you at survey.
How long will the battery last in an outage?
It depends on the load you carry and the battery capacity. A system backing up only essential loads will run far longer on the same battery than one trying to carry heavy appliances. Panels also recharge the battery during daylight, so a well-sized system refills between outages.
Does the system switch over automatically?
Yes. A hybrid inverter detects the grid failure and continues supplying your backed-up circuits in a fraction of a second, with no one present and no manual switching. When the grid returns it reconnects automatically.
Is solar backup better than a generator?
They solve the problem differently. A generator is cheaper upfront and unlimited on fuel, but noisy, needs servicing and does nothing for your daily bill. Solar backup is silent, automatic and the same panels cut your bill every day. Many sites keep a generator for rare long outages and use solar for daily savings and instant backup.
Keep the power on
Tell us which loads you need to survive an outage and we will size a backup system and quote it.