Lead-acid vs lithium batteries for solar in Uganda: which should you buy?
A practical comparison of flooded, AGM, gel and LiFePO4 batteries for Ugandan solar installations — covering cost, lifespan, maintenance and total cost of ownership.
The battery choice that defines your system
The battery bank is usually the most expensive single component in a solar installation and the one that fails first if chosen incorrectly. Uganda's climate — hot days, occasional dust, sometimes humid nights — places specific demands on battery chemistry.
Lead-acid batteries
Flooded lead-acid (FLA)
The cheapest option per kilowatt-hour of capacity. Brands like Ritar, Trojan and local Ugandan assemblers sell these widely. Pros: low upfront cost, easy to find replacements, can be replenished with distilled water. Cons: must be vented (dangerous hydrogen gas), require monthly maintenance (water top-up, terminal greasing), only 50% Depth of Discharge (DoD) usable, lifespan 2–4 years under regular cycling.
AGM (Absorbed Glass Mat)
Sealed, maintenance-free, no gas venting required. Safer indoors. DoD still limited to 50–60%. Lifespan slightly better than FLA at 3–5 years. Cost roughly 1.5× FLA. Common brands: Vision, Ritar, CSB.
Gel batteries
Better heat tolerance than AGM — important for rooftop battery rooms in Uganda where temperatures regularly exceed 30°C. Slightly higher cost than AGM. Sensitive to fast charging; must use a gel-compatible charger setting.
Lithium iron phosphate (LiFePO4)
LiFePO4 has become the default choice for new residential installations and is now readily available in Kampala. Key advantages:
- 80% DoD usable vs 50% for lead-acid — so a 100 Ah lithium does the work of a 160 Ah lead-acid
- 3,000–5,000 cycles vs 500–1,200 for lead-acid
- No maintenance — sealed, no watering, no equalization charges
- Built-in BMS protects against overcharge, over-discharge and short circuit
- Lighter — important for roof or wall mounting
Disadvantages: higher upfront cost (roughly 2.5–3× AGM per kWh), requires a lithium-compatible charger/inverter, and counterfeit cells are common (buy from a verified supplier).
Total cost of ownership comparison (typical Ugandan installation)
| Battery type | Upfront cost (100 Ah / 12 V) | Expected cycles | Cost per kWh delivered |
|---|---|---|---|
| Flooded LA | UGX 280,000 | 600 | UGX 560 |
| AGM | UGX 420,000 | 900 | UGX 560 |
| LiFePO4 | UGX 950,000 | 3,500 | UGX 325 |
Lithium costs more upfront but less per kWh over its life — particularly valuable if your system runs daily, as most Ugandan off-grid homes do.
When to choose lead-acid
- You have a small seasonal installation (e.g., a rural school that runs lights only)
- Upfront budget is the binding constraint
- You can do the monthly maintenance
- Lithium-compatible inverters are not available in your area
When to choose lithium
- Daily cycling (home, business, telecom)
- Hot battery location (roof room, outdoor cabinet)
- You want 10+ years without replacing cells
- Weight is a concern (top-floor apartment, mobile installation)
What to watch out for in the market
Kampala's electronics market contains many batteries with inflated capacity ratings. A genuine 100 Ah AGM should deliver 50 Ah usable under a 5-hour discharge (C5 rate). Ask for a datasheet, check the QR code if present, and buy from a dealer who will guarantee replacement within 12 months if capacity falls below 80%.
Our recommendation
For a new build or a replacement cycle, we recommend LiFePO4 from brands like Pylontech, BYD or Ritar Xtreme for residential systems. For budget-constrained rural installations, quality AGM remains a solid choice — just budget for replacement at year 4.