Re-use second-hand laptop batteries to make home batteries with performance superior to Tesla's powerwall

In order to save the electricity generated by the solar panel, to save the electricity fee by the peak shift and to use it as an emergency power supply in the event of a disaster, Tesla's "Powerwall"Household storage batteries such as are commercially available. However, aside from "Powerwall and others are too expensive", it seems that people using the lithium-ion battery for notebook PCs, making their own Powerwall, are increasing mainly in the United States.

People Are Using Old Laptop Batteries to Build Their Own Versions of Tesla's Powerwall
https://futurism.com/people-are-using-old-laptop-batteries-to-build-their-own-versions-of-teslas-powerwall/

People who make household storage batteries with DIY basically use the "18650" lithium ion battery. 18650 is a battery with a diameter of 18 mm and a length of 65 mm used for laptop batteries, etc. The most versatile lithium ion battery. The versatility is high, it can be said that it is the cheapest lithium ion battery.


Many lithium-ion batteries used in notebook PCs etc. are recyclable, but many are not recycled in the process of disposal. In the domestic storage battery, the used second-hand 18650 is often used, and it is not only to make home batteries much more cheaper than ready-made products such as Powerwall, but also to recycle lithium-ion batteries It seems there is also a merit that it is useful.

Initially it starts with a capacity of 7 kWhSecond generation modelFor the Powerwall whose capacity has expanded to 14 kWh, the user who makes the 28 kWh DIY residential battery corresponding to twice that capacityDIY home bulletin board bulletin boardIt is commonly seen that up to the villain who self-made household electricity storage system with 40 kWh storage capacity with 40 solar panels on the roof, people saying "I made it because it is unsatisfactory with the performance of ready-made goods" It seems to be inside.

The 40 kWh system by Mr. Peter Matthews of Australia is published in the following movie.

18650 DIY Powerwall Built from used laptop batteries ⚡ - YouTube


Matthews made home batteries by recycling second hand battery for notebook PC.


The system is stored in a metal locker.


For safety, the locker is locked with a padlock.


When opening the locker door the system appears.


There is also a monitor that shows the storage status of the battery.


Battery of 18650 lined up rowing.


Tesla's Powerwall uses 1120, while Matthews's system uses 4,480 1,8650 batteries, which is four times that.


Sensors for monitoring temperature and voltage are attached to the bundled recycled 18650 battery.


In order to hang a lot of batteries on the wall, Matthews made his own battery holder.


Battery holder that it is manufactured with high work precision.


18650 I made my own plastic holder to bundle the battery.


We also installed a guard for fall prevention to prevent accidents in the unlikely event.


40 solar panels are installed on the roof.


For 3 kW of electricity generated, "PCM 60X"For 1.5 kW,"PIP 4048It is said that it is managed with the solar photovoltaic controller called "


The generated electricity is supplied to the system with a cable of 35 square millimeters.


Attach a fuse to the junction box to prevent overcurrent.


A circuit breaker is also installed.


We also installed a water cooling system, it is said that the heat of the system creates domestic hot water.


On the back of the display for monitoring the state of the battery ......


Equipped with a missing PC for running the system. All of them have been converted to Wi-Fi.


Various additional boards that receive sensor information. Battery status and data monitored by the controller are sent to the smartphone and it seems that the system is built so that the situation can always be grasped remotely.


Mr. Matthews seems to cover all home electricity with our solar photovoltaic & storage system.


Matthews believes that DIY residential batteries that are attractive enough to make massive systems that are not commercially available at a much lower price than market prices have the advantage of being able to gain knowledge about power generation and storage during the manufacturing process. However, there are also people who generate fire accident due to lack of knowledge and experience, and it seems that there is a certain hurdle that self-made solar power generation & storage system is able to correctly perform safety control, and it is easy to manage it I can not recommend it.