As we move towards sustainable Living, battery places a very important role in fulfilling the shortfall from the intermediate renewable energy sources like solar and wind.
You may be confused about which battery to go for the Solar Rooftop system installed on your rooftop. Type of battery required depends on the application and the affordability of the battery. The table shows the comparison between different types of battery used in Solar Rooftop and Wind systems.
| Flat plate (Flooded) | Tubular (Flooded) | SMF VRLA | Lithium ion | |
| Suitable for | Low power applications | Heavy duty applications, frequent power cuts | UPS applications, back-up time less than 1hr | Heavy duty, High power density, |
| Price | Low | Medium | High | Very High |
| Life expectancy | Around 3 years | 4 to 8 years | 3 to 5 years | 5 to 10 years |
| Tolerance to depth of discharge | Suitable for discharges up to 80% of battery capacity | Suitable for discharges up to 80% of battery capacity | Suitable for discharges up to 50% of battery capacity | Suitable for discharges up to 80% of battery capacity |
| Cyclic operation life (Charge cycles at 60% Depth-of-Discharge) | 500 – 800 cycles | 1000– 1200 cycles | 400 – 450 cycles | 2000 – 2500 Cycles |
| Charging time | Charges slowly compared to tubular batteries | Faster charging | Faster charging | Very fast charging |
| Temperature performance | Inferior operation compared to tubular batteries | Satisfactory operation at extreme temperatures (both high and low) | Capacity reduces significantly at higher temperatures | High temperature reduces the performance |
| Electrolyte top-up frequency | Frequent water top up required | Less frequent top up | No top up required | No top up requried |
| Space requirement | High | Medium | Low | Very Low |
| Battery placement | Fixed | Fixed | Can be placed in any orientation | Can be placed in any orientation |
| Battery Emissions | High, proper ventilation required | Lower emissions compared to flat plate, proper ventilation required | No battery emissions | No emissions |
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