It's also important to note that a lithium battery can undergo a nearly complete discharge as rated without significant adverse effects.
Considering lithium batteries do not absorption charge, the charge time from completely discharged to completely full can be as little as two hours. The absorption charge stage of lead-acid batteries is particularly inefficient, resulting in efficiencies of 50% or even less.
This alone is a significant improvement for systems starved of solar power during winter, the fuel savings from generator charging can be tremendous. The round-trip energy efficiency of a Lithium Iron Phosphate battery is upwards of 95-98%. The round-trip efficiency (from full to dead and back to full) of the average lead acid battery is about 80%. In fact, it's possible to slightly improve overall life expectancy with a slight partial charge instead of a full charge.Įfficiency is a very important factor when designing solar electric systems. LiFePO4 batteries do not need to be fully charged regularly. This is a very big problem with lead-acid batteries and can promote significant plate degradation if repeatedly cycled in this manner.
Essentially, this is when the batteries cannot be fully charged before being discharged again the next day. This can make It difficult to tell how much capacity has been used without battery monitoring equipment.Ī significant advantage of lithium over lead-acid batteries is that they do not suffer from deficit cycling. It's not uncommon for a lithium battery to only drop a few tenths of a volt from a full charge to 75% discharged. During discharge, lithium batteries will maintain a much higher voltage than lead-acid batteries typically would under load.
The discharge characteristics of LiFePO4 batteries is also unique. Typically, when the battery reaches the max charge voltage it no longer needs to be charged.
What's unique to a lithium battery is that they do not need an absorption charge or to be held in a constant voltage state for significant periods of time. A four cell LiFePO4 Battery (12.8V), will typically have a max charge voltage between 14.4-14.6V (depending on manufacturers recommendations). Lithium batteries are often used to directly replace the lead-acid batteries because they have very similar charging voltages. These voltages work very well with your typical 12V, 24V, and 48V inverters.
Eight cells connected in a series make a 24V battery with a nominal voltage of 25.6V and sixteen cells connected in a series make a 48V battery with a nominal voltage of 51.2V. This will make the nominal voltage of a LiFePO4 12.8V. Therefore, to achieve a 12V battery you'll typically have four cells connected in a series. Lead acid batteries have a nominal voltage of 2V/cell, whereas lithium battery cells have a nominal voltage of 3.2V. Lithium batteries are an assembly composed of many cells, like lead-acid batteries and many other battery types. In most cases, these batteries can be stored in confined areas without the risk of explosion and a properly designed system should not require active cooling or venting. There's also no danger of exposure to caustic electrolytes such as sulfuric acid or potassium hydroxide. Unlike flooded lead acid and other battery chemistries, Lithium batteries do not vent dangerous gases such as hydrogen and oxygen. LiFePO4 batteries are not prone to overheating, nor are they disposed to 'thermal runaway' and therefore do not over-heat or ignite when subjected to rigorous mishandling or harsh environmental conditions. This is what gives these batteries their great thermal stability, long cycle life, and tolerance to abuse. Compared to other lithium chemistries iron phosphate promotes a strong molecular bond, which withstands extreme charging conditions, prolongs cycle life, and maintains chemical integrity over many cycles. The battery is assembled with a naturally safe cathode material (iron phosphate). Lithium Iron Phosphate (LiFePO4) is an extremely stable lithium chemistry when compared to almost all other lithium chemistries. This chemistry has excellent safety, with great thermal stability, high current ratings, long cycle life, and tolerance to abuse. For renewable energy applications, the predominant chemistry is Lithium Iron Phosphate (LiFePO4). There are about six common chemistries of lithium batteries, all with their own unique advantages and disadvantages. However, "lithium battery" is an ambiguous term. Lithium batteries stand apart from other battery chemistries due to their high energy density and low cost per cycle.