In brief
- A grid-tie solar system has panels and an inverter that work alongside the Kenya Power supply, with no batteries. It cuts the daytime bill and switches off during an outage.
- A hybrid solar system adds battery storage. It keeps chosen loads running during an outage and uses solar power after dark.
- Grid-tie suits sites with a reliable supply and mostly daytime use. Hybrid suits sites where outages are costly or where much of the power is used in the evening.
- A site can start with grid-tie and add batteries later, if a hybrid-ready inverter is chosen at the start.
How does a grid-tie solar system work?
Solar panels produce direct current. An inverter converts it to the alternating current the building uses and synchronises it with the Kenya Power supply. The building draws on solar power first, and the grid makes up any shortfall. There are no batteries.
Kenya receives roughly 4 to 6 kWh of solar energy per square metre per day. As a rule of thumb, each kilowatt of panels produces about 4 to 5 units of electricity a day, so a 100 kW system yields about 400 units a day. Every one of those units is a unit not bought from the grid.
Why does a grid-tie system switch off during an outage?
When the grid fails, a grid-tie inverter disconnects within moments. This protects the people repairing the line, who must be able to trust that it is dead. The panels may be in full sun, but the building has no power until the grid returns or a generator starts. A grid-tie system is a way to cut bills. It is not a backup supply.
How does a hybrid solar system work?
A hybrid system adds a battery bank and a hybrid inverter. During the day, solar power runs the building and charges the batteries. In the evening, the batteries supply the building. During an outage, the inverter isolates the site from the grid and carries on supplying the loads that have been chosen for backup.
Lithium iron phosphate (LiFePO4) batteries are now the usual choice in Kenya. Manufacturers commonly rate them for around 6,000 cycles, or 10 to 15 years of service. A hybrid system can also work with a generator, which then runs for fewer hours and uses less fuel.
How do grid-tie and hybrid solar compare?
| Question | Grid-tie solar | Hybrid solar |
|---|---|---|
| Does it have batteries? | No | Yes |
| What happens during an outage? | It switches off | Backed-up loads keep running |
| When does it save money? | During daylight hours | Day and evening |
| What is it best for? | Cutting the bill at sites with daytime use | Backup power and evening use |
| How complex is it? | Fewer parts, less to maintain | More parts, and batteries to size correctly |
| Does it work with a generator? | Yes, with the right controls | Yes, and it reduces generator running hours |
Which system suits a business or an institution?
Choose grid-tie when most of the consumption happens in daylight and the grid supply is dependable. Offices, schools, factories on day shifts and cold rooms fit this pattern. The system is simpler and it puts all of the investment into producing power.
Choose hybrid when an outage stops work or puts people at risk. Hospitals and clinics, hotels, server rooms, telecom sites and security systems are typical cases. Hybrid also suits sites that run a diesel generator for many hours, because solar and batteries can take over part of that load.
Many larger sites combine the two. A grid-tie array covers the daytime load, and a smaller battery system protects the critical circuits.
Which system suits a home?
Most homes use more electricity in the evening than at midday, and most households want the lights, fridge, internet and security system to stay on during an outage. That makes hybrid the usual choice for homes. In Kenya, a 3 kW system suits a typical two to three-bedroom home. A 5 kW system, usually paired with a lithium battery of about 5 kWh, suits a medium to large home.
Grid-tie can still suit a home where someone is in all day, or where a borehole pump or water heater can be run in daylight.
What about selling surplus power to the grid?
In Kenya, a solar system may export surplus power only with approval and a net-metering agreement with Kenya Power. Each exported unit earns a credit of half a unit. Since September 2026, exports made without an agreement are treated as “dumping” and billed to the owner. Either type of system should therefore be sized around the site’s own consumption and fitted with export limiting. Read more in Why Should a Solar System Not Export Power Without Approval?
Can you start with grid-tie and add batteries later?
Yes, with planning. If a hybrid-ready inverter is installed from the start, batteries can be connected later without replacing it. If a standard grid-tie inverter is installed, adding storage usually means adding a second inverter. Tell the designer at the start that batteries are a possibility, so that the inverter, cabling and space are chosen with that in mind.
What will a site assessment look at?
- Twelve months of electricity bills, to see how much power is used and when.
- The outage pattern, and which loads must stay on.
- Roof or ground space, orientation, shading and structure.
- The existing electrical installation and any generator.
- Plans for growth, such as new buildings or equipment.
How does Vulfem International help you choose?
Vulfem International designs and installs both types of system for institutions, businesses and homes across Kenya. Read more about grid-tie solar systems and hybrid solar systems.
Get a personalised quote
Every system is sized and quoted for the site. Message Vulfem International on WhatsApp at +254 739 629 118 or email fmugo@vulfem.com. It helps to include recent electricity bills and the location of the site.
Last updated: 5 October 2026.
