If you've started shopping for a solar system in Kenya, you've almost certainly encountered two battery technologies: lithium iron phosphate (LiFePO4) and lead acid (flooded or AGM). Both store energy, but they behave very differently — and the right choice depends on your budget, load, and how long you want the battery to last.
LiFePO4 — the modern standard
LiFePO4 is a type of lithium-ion battery chemistry that prioritises safety and longevity over raw energy density. It's the technology inside almost every quality solar storage product on the market today, including Solarlux-recommended brands like Felicity Solar and Hinen.
- Cycle life: 3,000–6,000 full charge cycles (8–15 years typical)
- Depth of discharge: 80–90% usable capacity
- Efficiency: 95–98% round-trip
- Maintenance: Zero — fully sealed, no water top-up
- Temperature tolerance: Better performance in Kenyan heat
- Cost: Higher upfront, significantly lower cost-per-cycle
Lead acid — the established option
Flooded lead acid (FLA) and absorbent glass mat (AGM) batteries have been used in solar systems for decades. They're cheaper upfront, widely available, and well understood. For very small systems or constrained budgets, they remain a viable choice.
- Cycle life: 300–700 full cycles (2–5 years typical at 50% DoD)
- Depth of discharge: 50% usable capacity
- Efficiency: 70–85% round-trip
- Maintenance: FLA requires regular water top-up; AGM is sealed
- Temperature: Performance drops significantly above 35°C
- Cost: Lower upfront, much higher cost-per-cycle over time
True cost comparison: A 200Ah LiFePO4 battery at KES 60,000 lasting 10 years costs roughly KES 16/day. A 200Ah AGM at KES 25,000 lasting 3 years costs KES 23/day — 44% more expensive per day of use.
Which should you choose?
For any new installation in 2025 and beyond, we recommend LiFePO4 for almost all residential and commercial projects. The upfront cost difference has narrowed significantly, and the total cost of ownership advantage is now compelling.
The only scenario where lead acid still makes sense is a very small, low-budget system (under 1 kWp) where the client expects to upgrade within 2–3 years. Even then, an entry-level LiFePO4 is worth stretching to.
