LiFePO4 vs Lead-Acid for Home Energy Storage
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Lead-acid batteries were the standard for decades. Today lithium iron phosphate (LiFePO4) is the default choice for home storage for good reasons.
Lifetime
LiFePO4 batteries typically deliver several thousand cycles, while lead-acid is usually rated for a few hundred at deep discharge. Over the life of the system, the cost per delivered kilowatt-hour is lower.
Usable capacity
Lead-acid should not be discharged much below half to keep its life. LiFePO4 can be used at a much deeper depth of discharge, so a smaller nameplate capacity delivers the same usable energy.
Safety
LiFePO4 is among the most thermally stable lithium chemistries, and a built-in BMS protects against over-charge, over-discharge, over-current and short circuits.
Maintenance and size
No watering, no equalisation, and about a third of the weight for the same usable energy.
Where lead-acid still fits
Very low upfront budgets and rarely-used backup systems. For daily cycling, LiFePO4 wins.