Lead Acid Batteries: Are They An Excellent Solar Battery?
公開日:2022/04/27 / 最終更新日:2022/04/27
Lead Acid Batteries: Are They An excellent Solar Battery?Is lead-acid a great solar battery?
Lead-acid battery execs and cons
When should you choose lead acid batteries?
Lead acid battery FAQs
Lead Acid Batteries: Are They A great Solar Battery?
Invented in 1859, lead acid batteries are the oldest rechargeable battery. First used to energy practice carriage lights, lead-acid is right this moment the dominant battery used in the automotive trade.
Does this imply you need to use a car battery as a photo voltaic battery? You’ll be able to however car batteries aren’t designed for frequent charging and discharging. You will wear that battery out in a couple of months.
Lead acid photo voltaic batteries are both Flooded Lead Acid (FLA) or Sealed Lead Acid (SLA). This publish is a broad introduction to guide-acid. If you want to get into specifics of every sort try this information to flooded lead acid batteries, this one on sealed lead acid batteries, and this comparison of flooded vs sealed lead acid batteries.
Is lead-acid a great solar battery?
The primary benefit lead-acid has over other varieties of solar batteries is the worth. Lead-acid is the cheapest. Lead-acid batteries are as much as 2-three instances cheaper than lithium.
Lead-acid has some drawbacks. Lead-acid batteries have a shorter cycle rely, take longer to cost and ship less power.
If you’re buying round for solar batteries and you’re looking at lead-acid here are some key characteristics, it is advisable to know.
Battery capacity
Capability is the entire energy a battery holds. Batteries also have a depth of discharge. Depth of discharge is how a lot energy (as a proportion of the batteries complete capability) you need to use.
Lead-acid has a depth of discharge of 50%. Meaning when you have a 100Ah battery you should utilize 50Ah without the chance of permanently lowering the batteries capability. This occurs while you exceed the depth of discharge.
Depth of discharge is vital to know because:
1. Sticking to the depth of discharge provides the battery an extended lifespan.
2. Depth of discharge can determine the sizing and design of a photo voltaic energy system.
The capacity of lead-acid batteries isn’t fastened. It varies with how quickly it’s discharged. The extra appliances you’ve got, the quicker the discharge. The quicker the discharge, the lower the capacity.
Effectivity
Battery efficiency is how a lot energy saved you need to use. When you’ve got a hundred watts coming into a lead-acid battery, you should use eighty five watts. That’s as a result of lead-acid has an effectivity of 85%.
As a result of they have decrease effectivity, lead acid batteries charge slower. This is especially critical for an off-grid solar system in winter or on cloudy days.
Energy density
The density of a battery is how much energy per weight it holds. Lead-acid has the lowest vitality density in comparison with different battery types.
A lower vitality density makes lead acid batteries up to 50% greater and three times heavier than lithium. Being larger and heavier can be a problem by way of set up you probably have limited house.
Here’s an in depth comparability of lithium vs lead acid batteries if you wish to know which is the better photo voltaic battery and why.
Cycle life
Batteries have a cycle life. A charge and discharge (by use) make one cycle. Lead-acid batteries have an average of 2000 cycles. You’ll be able to charge + discharge them about 2000 occasions.
To work this out in days divide 2000 by 365. This offers lead-acid a lifespan of roughly 5 years. This relies on a one cycle per day basis while sticking to the depth of discharge.
Other traits
It is advisable know the capability, efficiency, density and cycle life of a solar battery. There are a couple of other efficiency specifications that aren’t as vital however are still necessary. These are flexibility, battery upkeep, self-discharge and recycling.
Flexibility
With lead-acid, you can’t mix batteries of different ages. All the batteries, if wired collectively, must be bought collectively. The drawback of this is you can’t buy one battery this year then purchase extra as your energy needs grow or as cash turns into accessible.
With lithium, you’ll be able to combine batteries of various ages.
Maintenance
Flooded lead-acid batteries need maintenance. If you don’t desire a battery that requires you to be fingers on then you definitely don’t want an FLA battery. Discover out what sort of maintenance is required for flooded lead-acid batteries here.
Self-discharge
Batteries lose some energy even when they’re not related to a load. Lead-acid has a better price of self-discharge (2-5%) per month than other batteries.
Recycling
Because they comprise lead, lead-acid batteries are more durable to recycle. The lead presents an environmental hazard if not properly disposed of.
As it’s extremely toxic, this makes lead-acid battery recycling one of many world’s deadliest industrial processes.
Lead-acid battery professionals and cons
To summarize all the things, let’s weigh up the professionals and cons of lead acid.
Professionals of lead-acid
1. It’s the most cost effective solar battery. It will probably cost as much as 2-three occasions less than lithium batteries.
Cons
1. Less depth of discharge gives you much less usable power.
2. Slower charging. That is essential in winter and on cloudy days when there’s much less sun to cost the batteries.
3. An even bigger and heavier battery restricts set up options when you’ve got restricted space.
4. Shorter lifespan.
5. Some lead-acid batteries like FLA want upkeep.
6. Restricted flexibility by way of increasing your battery financial institution measurement.
When should you select lead acid batteries?
Lead-acid has a number of disadvantages. This doesn’t imply you must break the financial institution to go along with lithium batteries. There are particular eventualities where lead-acid will work just positive.
Off-Grid home or full-time use
For off-grid or full-time use, you may go with Flooded Lead Acid (FLA) as long as you don’t mind the maintenance.
For a 2nd dwelling or residence, you don’t use as much, Sealed Lead Acid (SLA) is ideal. They don’t need upkeep and won’t die if left idle for lengthy periods.
Battery backup
If you’re just worried about blackouts or load shedding and you want backup energy you want Sealed Lead-Acid (SLA). Lithium is perhaps costly if you’re barely going to make use of them and FLA requires too much upkeep.
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