Should you choose lead-acid or lithium batteries for solar storage?

Whether you opt for lead-acid or lithium technology, our goal is to help you harness solar power effectively and take control of your energy future. As the energy landscape continues to evolve, the choice between lead-acid and lithium batteries for solar storage will likely become even more nuanced.

What is the difference between lithium ion and lead-acid batteries?

The gravimetric energy density of lead-acid batteries range from around 30 to 50 Wh/kg while that of lithium-ion batteries is about 150-250 Wh/kg. That is to say, the energy density of lithium-ion batteries is approximately 5 times greater than that of the lead-acid, supplying much more energy per unit mass.

Are gel lead-acid batteries a good choice?

Gel lead-acid batteries, a variant of VRLA technology, have become a good choice for solar energy systems and other off-grid applications. Unlike traditional flooded lead-acid batteries, these batteries are less likely to encounter liquid leakage and require less maintenance.

What is a lead-acid battery?

Lead-acid batteries have been a staple in energy storage since the mid-19th century. These batteries utilize a chemical reaction between lead plates and sulfuric acid to store and release energy. There are two primary categories of lead-acid batteries:

What is a lithium ion battery?

Lithium-ion batteries represent a more recent advancement in energy storage technology. These batteries utilize lithium ions as charge carriers between cathodes and anodes within their cells. For solar applications, Lithium Iron Phosphate (LiFePO4 or LFP) is the most commonly utilized type due to its stability and safety profile.

How much does a lead-acid battery cost?

Lead-acid batteries typically cost about $75 to $100 per kWh, while lithium-ion ones cost from $150 to $300 per kWh. Some will be thinking that lead-acid batteries pop up as an ideal choice for projects with tight budgets. But always, the cost should not be simply counted.