11 secrets of About Lithium battery storage PowerWall

11 things you need to know about LFP battery powerwall

The LFP Powerwall is a scalable energy storage wall mounted battery system. It is a good solution for any on grid or off grid residential and commercial utility solution. Much popular and welcome by homeowners. With LiFePo4 cell built in, provide clean, efficiency and enduring energy to house owners.

There are a lot’s furniture or other small things in our house. Keep the battery system hang on the wall will makes our home clean and tidy. Say bye to mess.Most of the time, we can’t 100% make sure our floor is dry. Wall mounted keeps the battery storage system far away from the risk of watering on floor. In additional, more friendly to user read battery information and operation.

Different from Tesla Powerwall’s NCM, LiFePo4/LFP is another kind of rechargeable lithium-ion battery. People also call it lithium iron phosphate battery. There are different types, but most popular one is prismatic LFP cell and cylindrical LFP battery cell. Our OEM LFP Powerwall apply with large size capacity prismatic cells.
The advantages are mainly from battery cycle life. A qualified LFP is rated 5000+ cycles for life span. And this makes sure it can service over 10-15 more years on battery storage system utility.

Secondly advantage is the safety. During the charging and discharge, LFP battery will never vent and battery is not getting fired or explores if the damage hit the limited. As we said. Safety is always priority. That’s the key point to use the most efficiency and safety LiFePo4 battery for power wall energy storage system.

LFP Powerwall
powerwall 10kwh
2500wh

Energy and capacity of Powerwall

Normally An OEM Powerwall with 2500wh, 5000wh, 7000wh, 10 Kwh. 5 kwh and 10Kwh are the most popular one. The only reason is the consideration of the system weight. A 5000wh battery wall is normally 48kg. And a 10kwh battery wall is about 98kg. As we can see, if we build a 20kwh powerwall, then most probably you will not strong enough to carry it or install it to the wall. The most popular home battery storage system is based on 48v. So, we normally offer 48v 50Ah, 48v 100Ah and 48v 200Ah powerwall.

Tips: Based on LiFePo4 battery, you will normally have 2 different version based on voltage. There are 48-volt nominal voltage. The inside cell connection by 15 in series. (15*3.2v=48 volt). At the same time, there is 51.2 volt (16S*3.2v=51.2v). You need contact with your battery supplier which voltage is offered exactly. Basically, both voltages are ok. But we will recommend 51.2v 16S as nominal voltage. if the price is not a major concern by user.

How many pcs of powerwall can I parallel?

Based on our currently BMS. It supports 16pcs connection in parallel. For example, if you order 48v 100Ah module, you will able use 16pcs battery wall for one system. The system will be 48v 1600Ah. System 81.9Kwh.

Inverter consideration

To build a perfect battery storage system, a qualified inverter is very important. Before you choose the inverter, you will confirm what system you are trying to build.
Off grid or on grid. Off grid is a system for local use only. while a on grid system will sell the electric to grid if the battery system is fully charged.
Then, for normal user, you will select 48v hybrid inverter. Remember it should support Lithium-ion type batteries. Charging voltage is possible set to 54 volt or 58 volts.
The last thing is the communication protocol. RS485 or CAN. Make sure it communicates with battery BMS system. Confirm with Battery supplier if the BMS can support your inverter in terms of communication.

Solar Panels for the Powerwall

There is no fix way to calculation how many solar panels you will need for the system. Different region will be different sun power. Basically, we can have an average 5 hours sunshine each day. Based on 5 hours. A 300W solar panels can generate 1500Wh power. You will need 3.3pcs 300w solar panels to fully charge a 5000wh powerwall. Of case, we can’t install 3.3pcs panels. So, we can install 4pcs panels at least. Remember, all these powers generated will goes to the powerwall. If this power also goes to your load during the day. It will not fully charge a 5000wh batter wall by one day. And you need a fully consideration on your load as well. Same way for 10kwh and more.

solar panels installation
solar PV

Do I need a MPPT to charge the Powerwall?

Yes. You will need a MPPT. Now, most of the popular inverter included the MPPT together. That’s why we suggest to use a hybrid inverter.

MPPT Solar controller

Does the Powerwall waterproof. Can you install it outdoor?

The Powerwall is rated IP65. It with basic waterproof function. but you can’t expose it out door for rain. If you must install it out door, make sure you will build a protection for the battery power wall system. Customer can try to install a NEMA 3R enclosure as a protection.

NEMA 3R

Reality DIY Powerwall.

As Powerwall is popular, many electricity fans trying to build Powerwall by themself. We normally say DIY. DIY is really a kind of hobby for most of people. And we have really fun when we make something really works and on our own hand. However, we are only encouraging technical person to handle these kind of DIY jobs. And make sure you really understand how does a lithium-ion battery works. Or otherwise, DIY is not entertaining you, could be a disaster most of the time.

You might say, I really understand how does a lithium battery works, and knows everything about LiFePo4 battery and battery packs, also BMS. Does that mean it is really worth DIY? The answer may surprise you by following reasons:

Why say No to DIY

  • 1. How do you make sure you get really qualified cells? Battery cell manufactures only sell cells to certain customers we can name it. Most of the time, people buying cells in the market is B or other unqualified cells. when you build a power wall by these cells, and use it at home. it a high risk for your property and family life.
  • 2. A qualified battery pack factory get tens of thousands test on the cells and BMS. they have the ability to understand and control the risk.
  • 3. The factory use tens of thousands of cells from the original Cell factory. They can get high quality cells and better price.

As a matter of fact, DIY can’t help us to save money. But it does bring us fun. That’s might be sad, but ok, come to us, with your DIY cost, get a finished high qualified Powerwall for your house energy storage system.

Tell us what you think on Lithium ion battery Powerwall products.

CMX Powerwall is Lithium iron phosphate battery module which designed for residential energy storage application. This battery module integrated with intelligent BMS inside, has big advantages on safety, cycle life, energy density, fast charging, temperature range and environmental protection. And also, it has a beautiful fashionable modeling design. Coremax is committed to providing safe and stable power supply for residential energy storage system.

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