Views: 40 Author: Site Editor Publish Time: 2021-10-20 Origin: Site
If you need to install a home energy storage system, then the inevitable problem is how to choose the home energy storage battery. You must ask: isn't it the battery? What could be different? It's just a different brand!
Nope, what a difference! At present, home energy storage batteries are basically divided into two types, lead-acid batteries and lithium iron phosphate batteries (LFP) . What's the difference between the two batteries? Which one is better as a home storage battery?
First we need to know what is a lead-acid battery and what is a lithium iron phosphate battery. Come on class now, back to the seat please.
Lead acid battery is a kind of accumulator, the electrode is mainly made of lead, the electrolyte is sulfuric acid solution. The lead-acid battery is a very old type of battery. It was invented in 1859. And there are two kinds of lead acid batteries, one is flooded lead-acid (FLA), One is sealed lead acid (SLA). FLA batteries require regular maintenance, while SLA batteries do not. So generally SLA battery will be slightly more expensive than FLA battery.
Lithium iron phosphate battery, or LFP battery for short, is a kind of lithium ion battery. The electrode is made of lithium iron phosphate (LiFePO4) as the cathode material, carbon as the cathode material, and non-water electrolyte as the electrolyte.
The properties of the two batteries can be very different depending on the materials used to make them.
First of all, we are most concerned about the cost, there is no doubt, in the early investment, lead-acid battery is fully occupied the advantage. lead acid batteries are relatively inexpensive because they are relatively simple to make and use cheap materials. If you only talk about bare batteries, FLA batteries will cost between $50 and $100, and SLA batteries will be a little more expensive. But LFP batteries are expensive. Even though the materials are cheap and common, the manufacturing process is complicated and expensive, costing more than $100 per battery, which is usually more than twice as expensive as lead acid batteries. So you have to wonder, why would I even consider an LFP battery if the price difference is so far? The cost of LFP battery is lower than FLA and SLA batteries when considering the life cycle, for example if you intend to use it for many years. Therefore, lead acid batteries are more suitable if they are only used for a short period of time or for very few times. Conversely, LFP batteries are better.
In addition, there are other factors mentioned below that will answer your question.
The question of energy density is also very important. LFP batteries are more powerful than lead acid batteries in the same space, which means that if you need 20 lead acid batteries in a system, you might need only four or five LFP batteries. So if you have a narrow usage scenario, or if you don't want to see a bunch of annoying batteries at all, then LFP batteries are a great way to save space.
lead acid batteries and LFP batteries also have different effects. For now, the LFP's cells are more efficient. This means more solar/wind energy can be stored and used. In general, lead acid batteries are only 80-85% efficient, depending on the model and conditions of use. LFP batteries have an efficiency of over 95%, which varies from model to model. For example, if you get 1,000 watts of solar energy, a lead-acid battery will only have 800 to 850 watts available after charging and discharging. The LFP battery will have more than 950 watts of power available. Higher efficiency also means your battery can charge faster.
In addition, the DoD of these two batteries is also different. DoD is the depth of discharge , which is the ratio of power consumption to total power. For example, if you use 40 percent of the battery, the depth of discharge is 40 percent. Most batteries don't run out while you're using them. Most will have a recommended discharge depth, which is how much can be used before recharging. Most lead acid batteries can only run up to 50% of the discharge depth, beyond which damage can occur. LFP batteries can achieve a deep discharge of 80% or more. This means that the LFP battery has a higher capacity.
Of course, battery life is different. Lead-acid battery life is generally in 2~4 years, cycle life is generally in the hundreds of times or so; The life of LFP battery can reach 5-15 years, and the cycle life is basically more than 2000 times. For use as a home storage battery, lead acid batteries may have a much lower life, requiring replacement in 1-2 years.
Overall, LFP batteries are much better than lead acid batteries in terms of utility.
There will also be safety differences between the two batteries. Lead is known to be toxic and contains vitriol electrolytes, which can be dangerous if they leak. LFP batteries are made of cleaner materials. From a material point of view, LFP batteries are safer than lead acid batteries. From a usability standpoint, lead acid batteries are safer than LFP batteries if they are hit or squeezed. However, if overcharge is a problem, lead acid batteries are more dangerous than LFP batteries. lead acid batteries have much weaker overcharge protection than LFP batteries, and once overcharge occurs, lead acid batteries will react much more violently than LFP batteries. There have been many accidents to prove this point. So overall, LFP batteries are safer than lead acid batteries.
The range of applications varies, but it is important to note that LFP batteries are not suitable for low temperatures (-20°C is the limit). In addition, lead-acid and LFP batteries can be used in most scenarios. In the off-grid cabin/vacation house/battery backup scenario, household energy storage is not often used, and lead acid battery is more recommended. If the budget is sufficient, SLA battery is recommended, which does not need maintenance. FLA battery can be used if the budget is insufficient, and regular maintenance is required. However, in the case of full-time off-grid residential /Remote Industrial Use and frequent Use of household energy storage, LFP batteries are recommended. Many areas currently have self-generating incentive programs, which allow LFP batteries to store energy in the long term and send excess power to the local grid to earn extra money, partly covering the cost of initial installation. In fact, there are no advantages and disadvantages, mainly according to the use of the scenario to choose which battery to use.
All in all, lead-acid batteries and LFP batteries have their own advantages. However, at present, lead-acid battery can be said to have come to the end of its development, while LFP battery is in a state of rapid development. Many enterprises are doing related research and development, and the production cost is also constantly reducing. In the near future, the price of LFP will definitely have an exciting drop. Therefore, in the future, LFP will definitely occupy the dominant position of household energy storage battery. So the reason to choose LFP is very strong, this is the new age.
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