Lithium Iron Phosphate Batteries

Since choosing the AGM (lead acid) batteries, I have learned that Lithium Iron Phosphate technology has significant advantages over lead acid and Lithium-Ion technologies for solar power energy storage. Lithium-Ion store a higher density of power than Lithium Iron Phosphate but Lithium iron Phosphate is stable and not prone to fire or explosion. The potential instability of Lithium-Ion technology is one of the factors that led me to choose the AGM batteries. For more information I recommend this comparison:

The advantages of Lithium Iron Phosphate are the increased discharge capability. You can fully discharge Lithium Iron Phosphate (LIP) without significantly reducing the life cycle. With the lead acid batteries I have 22 kWh of energy stored in the batteries but can only use a little more than half of that as it is recommended that you only discharge to 40% of the capacity of the battery. You can get much closer to the full energy stored with LIP technology. Another advantage of the LIP is weight per kWh of energy. The AGM batteries are heavier at 56 lb/kWh vs 21 lb/kWh for LIP. Another advantage of LIP technology is the much longer life cycle which according to Signature Solar (link below) will allow fully charging and discharging daily for over 15 years without issue:

Prices per kWh at the above website are comparable to AGM prices.

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