If you don’t want to depend on the grid for your home’s electricity needs, a hybrid or off-grid solar system can be useful. With the right battery, it will make you energy independent. This raises the question of which battery should be used for a home solar system. Looking at the current market options, the competition is primarily between lithium-ion and lead-acid batteries. Today, we’ll explain how both types of batteries work and which one costs less and offers more benefits.
Lithium-ion batteries have lithium components such as lithium iron phosphate and nickel manganese cobalt at the cathode, while graphite is at the anode. They store energy using fast-moving lithium ions. When a solar panel generates electricity, the lithium ions move from the positive plate to the negative plate, and when the stored energy is used, the ions move back from the negative plate to the positive plate.
Considering lead-acid batteries, both the positive and negative sides are lead plates, which are placed between sulfuric acid, which acts as the electrolyte. When the battery is charged, a reaction occurs between the lead plates and the acid. When the battery is discharged, this reaction is reversed.
Lithium-ion batteries are more expensive in terms of price. Based on the kWh, lithium-ion batteries cost approximately ₹15,000-₹20,000 per kWh. In comparison, lead-acid batteries can be found for approximately ₹8,000-₹12,000 per kWh. The question arises: is a lead-acid battery the right choice because of its lower price? The answer is that if you’re only looking at the upfront cost, these batteries are suitable, but they do have several disadvantages.
While the initial cost of lithium-ion batteries is higher, their benefits cannot be ignored. Lithium-ion batteries charge faster than lead batteries and have a longer life. While lead batteries last 3-5 years, lithium batteries can last over 10 years. Similarly, lithium batteries are smaller and lighter than lead batteries. Lead batteries require frequent maintenance, while lithium batteries don’t. Lithium batteries can be monitored via Bluetooth. Thus, lithium-ion batteries are a better option for solar systems.