Powerwall Vs. Lead Acid Batteries. Which is best for off grid?

Views: 754     Author: Site Editor     Publish Time: 2020-09-24      Origin: Site


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Is BSLBATT's Powerwall more efficient than lead-acid inverter batteries?

● Battery storage is becoming an increasingly popular addition to solar energy systems.

● Two of the most common types of chemical batteries are lithium-ion and lead-acid.

● As the name suggests, lithium-ion batteries are made from lithium metal, while lead-acid batteries are mainly made from lead and acid. As our wall-mounted powerwall is powered by lithium-ion, we’ll make a comparison between these two--powerwall vs lead-acid.



Offers a slightly different nominal voltage, which actually makes it more suitable to be a lead-acid battery replacement.


● The electricity comparison between these two types:

 Lead-acid battery:  12V*100Ah=1200WH    48V*100Ah=4800WH

● LiFePO4 battery:  12.8V*100Ah=1280KWH  51.2V*100Ah=5120WH

● Lithium iron phosphate batteries provide more usable capacity than a lead-acid equivalently rated product. You can expect up to twice as much run time.


2-Cycle life. 

● You might be already very familiar with the cycle life of the lead-acid battery.

● So here we’ll just tell you the cycle life of our wall mounted LiFePO4 battery.

● It can reach more than 2000cycles @100%DOD,  4000 cycles @80% DOD.


In the meantime, LiFePO4 batteries can be discharged up to 100% without risk of damage. 

Make sure you charge your battery immediately after discharge. We recommend discharging be limited to 80-90% depth of discharge (DOD) to avoid the BMS disconnecting the battery.


3- Powerwall Warranty Versus Lead-Acid

The BSLBATT Powerwall’s internal software carefully monitors its batteries’ rate of charge, discharge, voltage levels, temperature, percentage of the world conquered, and so forth, in order to maximize their lifespan which enables it to come with a 10-year warranty with an optional extension out to 20 years. Meanwhile, the makers of lead-acid batteries have no control over how you are going to use their products and so only offer warranties of one year or perhaps two if you are willing to pay for a more expensive brand. This is the Powerwall’s greatest advantage over the competition. Most people, and particularly business people, are simply unwilling to shell out a significant amount of money for a new investment unless they know they won’t be out of pocket if something goes wrong. If lead-acid batteries were my only choice, I know I would pay a huge premium for ones that came with a ten-year warranty.



● LiFePO4 Lithium Iron Phosphate can stand a wider range of temperature while discharging, so can be used in most tropical areas.

 Ambient Temperature for Lead Acid battery: –4°F to 122°F

● Ambient Temperature for LiFePO4 powerwall battery: –4°F to 140°F

In addition, with the ability to endure higher temperatures, it can stay safer than lead-acid battery since LiFePO4 batteries are equipped with BMS. This system can detect the detect abnormal temperature in time and protect the battery, automatically stop charging or discharging immediately, therefore there won’t be any heat generated.  

home battery1

5-Powerwall Storage Capacity Versus Lead-Acid


The capacities of the Powerwall and lead-acid batteries can’t be directly compared because life is confusing. For the $3,800 dollar cost of a 7-kilowatt-hour Powerwall, I could buy around 17 kilowatt-hours of decent quality long-life lead-acid batteries. However, because they can’t be discharged by more than 80% they really only have about 13.6 kilowatt-hours of effective storage. And if I want them to last 15 years then I’ll need to avoid discharging them by more than around 25% a night, so for the majority of the time they really only have about 4.25 kilowatt-hours of storage. So for day to day use the Powerwall is superior, but when required lead-acid batteries can be more deeply discharged to provide electricity during periods of bad weather and/or high electricity use. But if this is done too often it will destroy them.



The price of LiFePO4 battery will be higher than current lead-acid batteries, need to invest more at first. But you will find LiFePO4 battery has better performance.

We can share the comparing table for your reference if you send the specification and cost of your batteries in use. After checking the Unit price per day(USD) for 2 types of batteries.

You will find out that LiFePO4 batteries unit price/cycle will be cheaper than lead-acid batteries.


7-Influence on the environment.

We’re all concerned about protecting the environment, and we strive to do our part to reduce pollution and resource consumption. When it comes to choosing a battery technology, LiFePO4 batteries are an excellent choice for enabling renewable energy like wind and solar and for minimizing the consequences of resource extraction.

8-Powerwall Efficiency


A Powerwall’s energy storage efficiency is 92% which is significantly better than lead-acid batteries at around 85%. In practice, this is not a huge difference, but it does help. It will take about one half to two-thirds of a kilowatt-hour less solar electricity to fully charge a Powerwall with 7 kilowatt-hours than lead-acid batteries, which is roughly half the average daily output of one solar panel.


9-Space Invaders


The Powerwall is suitable for inside or outside installation, takes up very little space, and as the name suggests is made to be mounted on walls. When properly installed it should be extremely safe. There are lead-acid batteries that can be installed indoors with suitable precautions, but due to the very small but real chance that a lead-acid battery will decide to transform itself into a hot pile of fuming goo, I strongly recommend putting them outside. The amount of space taken up by enough lead-acid batteries to power an off-grid house is not as great as many people often assume but are still greater than what Powerwalls require. To take a two-person household off-grid might require a bank of lead-acid batteries around the width of a single bed, the thickness of a dinner plate, and about as high as a bar fridge. While a battery enclosure is not strictly necessary for all installations, precautions do need to be taken to prevent children from stress testing the system or vice-versa.



Sealed long-life lead-acid batteries require a small amount of maintenance every six months. The Powerwall requires none.


If you want a battery with over 4000 cycles based on 80%DOD;

If you want to charge the battery within 1-2 hours;

If you want half weight & space usage of the lead-acid battery...

Come and go along with the LiFePO4 powerwall option. We believe in going green, just like you.