Lead Acid V. Lithium Battery: Which is Better? A Look at Depth of Discharge & Usable Capacity Video
Real Goods explains the differences between lead acid and SimpliPhi lithium iron phosphate batteries & why they ended up choosing SimpliPhi. “These lead acid batteries had 144 kWh of storage in them. Our new batteries have about 81 kWh worth of storage in them, total rated capacity. But with lead acid you only want to use about 35%, the top 35% of the power on a daily basis, otherwise you start to decrease the longevity. So, if we were to use 35% of the capacity on a daily basis, these would be 50 kWh worth of storage - the 2 banks we have here. These guys on the other hand, because we can use 80% of their power on a daily basis, we wind up with about 65 kWh of storage. So the old ones: 50 kWh of storage, and the new ones: 65 kWh worth of storage. So, even though we've actually decreased the overall rated capacity of our battery bank, we actually have more usable on a daily basis.”
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