How do lithium-ion batteries compare against lead-acid batteries in PV systems?

Do the increased efficiency and service life of lithium-ion batteries justify their extra cost?

  • The main disadvantage of lithium-ion batteries is their high upfront cost, which may be 5 times the cost of a lead-acid battery bank of the same rated capacity. However, there are considerable advantages to the technology:

    -Service life is 4 times longer... for example a lead-acid battery which is rated for 500 cycles may be replaced by a lithium-ion battery rated at 2000 cycles.

    -Lithium-ion batteries have a higher usable capacity: Lead-acid batteries can normally only take 50% depth of discharge, while lithium-ion can work with 80%.

    -Lead-acid batteries must be fully charged before being re-used, not the case with lithium-ion cells.

    -Lithium-ion cells are much more compact and less heavy, for a given battery bank capacity.

    -Lithium-ion batteries are less sensitive to temperature, and can provide their rated amp-hours regardless of rate of discharge... lead-acid cells provide less capacity if the load is high.

    -Lead-acid batteries may lose up to 15% of the energy during the charge/discharge cycle (85% efficiency). Lithium-ion cells have an efficiency close to 100%.

  • In reply to Leonardo David:

    What about the Li-Ion Vs Opzs batteries?
  • Registered Users Member

    In reply to Leonardo David:

    Leonardo, in India, the more preferred power bank is Low Maint Lead Acid accumulators which get deep charge and discharge. These are now available in Tower-Type canisters and have a life and performance little better than sealed Gel batteries or Li-Ion. with good amount of charge and discharge on regular bases, the performance of lead-acid batteries from some OEMs is found to be more than 12 yrs. They are recommended with wind Turbines and Off-grid Solar.
    My understanding over the past decade was that the lead acid system was almost on its way out. Is this a change in recommendation from the past couple of years? I was going in for Gel batteries, but now, I am maikng a b-line for a manufacturer in my town who's lead-acid Batt are expensive, but users from past 12-13 yrs are still good with them.
Related Posts