Original 100KWh Solar Photovoltaic Off-Grid Battery Management System

xinyuanliu

Original 100KWh Solar Photovoltaic Off-Grid Battery Management System [Copy link]

 

The 16 pairs of 5 X 14 battery holders I ordered two weeks ago were delivered today. The plastic isn't too hard, but I would handle them with care to avoid problems.

I had to place two separate orders because the quantity per order is limited to 8 pairs. Both packages arrived today at the same time

dcexpert

Is this Tesla's way of learning?

蓝雨夜

Detailed production

https://hackaday.io/MichelKuenemann

qwqwqw2088

The battery pack is quite powerful

The plastic is not too hard, the outer shell serves to fix the battery, and the fixing bracket is important for the battery cell .

qwqwqw2088

Whose batteries are they?

One battery pack has so many colors

xinyuanliu

qwqwqw2088 posted on 2020-10-18 21:15 Who are the battery cells from? Why are there so many different colors for one battery pack?

There are so many colors, and a lot of them are purple. I guess it’s because their cargo inspector is a beautiful girl.

This is purchased by sea from abroad, the purchased Japanese Panasonic 18650 battery cells,

The Japanese are really strong. The batteries they make are two levels better than those made in China!

xinyuanliu

qwqwqw2088 posted on 2020-10-18 21:09 The battery pack has a lot of power and the plastic is not too hard. The shell is used to fix the battery, and the battery cell is mainly fixed. The bracket is very important.

The bracket is made of nickel steel frame. The two are very thick and the hardness is definitely enough. The strength is mainly in the bracket.

xinyuanliu

qwqwqw2088 posted on 2020-10-18 21:15 Who are the battery cells from? Why are there so many different colors for one battery pack?

Japan Panasonic

xinyuanliu

dcexpert posted on 2020-10-18 17:57 Is this to learn from Tesla?

Once this is done, the power accumulation reaches 100KWh, which is a power station. It can be completely disconnected from the power grid and powered entirely by solar energy. A full charge can be used by my family for half a month. It's so cool. I can buy a BYD electric car and don't have to pay for road expenses at all, haha

qwqwqw2088

xinyuanliu posted on 2020-10-20 09:58 There are so many colors, and a lot of purple. I guess their inspector is a beautiful girl. This is purchased by sea from abroad. The purchased Japanese pine...

In the past few years, when there were few 18650 manufacturers, the color of the battery of some manufacturers represented the capacity.

dcexpert

xinyuanliu posted on 2020-10-20 10:03 Once this is done, the power accumulation reaches 100KWh, which is a power station. It can be completely disconnected from the grid and powered entirely by solar energy. A full charge...

If you want to fully charge your battery with solar energy, how powerful a solar panel will you need, how long will it take, and how much will it cost.

qwqwqw2088

xinyuanliu posted on 2020-10-20 10:01 Panasonic of Japan

In the past, the colors of Japanese Sanyo's lithium batteries
were white head, yellow head 1950mah,
blue head 2000mah,
red head 2200mah
, green head 2400mah,
light blue head 2600mah.

Now that Panasonic has acquired Sanyo, it seems that this is no longer the case.

xinyuanliu

qwqwqw2088 posted on 2020-10-20 10:05 In the past few years, when there were few 18650 manufacturers, the color of the batteries of some manufacturers represented the capacity

Yes, these colors look good together.

This 100KWh off-grid energy storage system is very powerful. Once it is built, it can be a power station. It is self-sufficient and powerful.

No more electricity bills, haha

xinyuanliu

dcexpert posted on 2020-10-20 10:08 If you want to fully charge your battery with solar energy, how much solar panel power do you need, how long does it take, and how much does it cost.

Buy more solar panels. I currently use two solar panels for 10KWh. When I reach 100KWh, I will need 20 solar panels. The initial cost is still a bit high, but it will pay for itself in 5 years.

qwqwqw2088

xinyuanliu posted on 2020-10-20 10:09 Yes, these colors look pretty good together. This 100KWh off-grid energy storage system is very powerful. After it is built, it will be a power station, self-sufficient...

Which BMS do you use?

Looks very strong, let me introduce it.

dcexpert

xinyuanliu published on 2020-10-20 10:13 Buy more solar panels. I currently use two solar panels for 10KWh. When the stack reaches 100KWh, it will reach 20 solar panels. The initial cost...

The efficiency and capacity of many solar panels and batteries will drop significantly within 5 years, and replacement is another cost.

xinyuanliu

dcexpert posted on 2020-10-20 10:08 If you want to fully charge your battery with solar energy, how much solar panel power do you need, how long does it take, and how much does it cost.

If this system runs without failure, it will be no problem to use it for 20 years. It is much better than the life and safety of the car BMS, because there are more batteries, the power is enough, there will be no deep discharge, and it runs very smoothly. The main thing is to add a balance board and calculate the soc.

xinyuanliu

qwqwqw2088 posted on 2020-10-20 10:15 Which BMS is used? The English looks very powerful. Please introduce it.

I wrote my own BMS. I am still testing it while using it. I am a BMS developer.

qwqwqw2088

xinyuanliu posted on 2020-10-20 10:18 I wrote my own BMS, which is still being tested while in use. I am engaged in BMS

Welcome to share the problems found in the test

xinyuanliu

qwqwqw2088 posted on 2020-10-20 10:15 Which BMS is used? The English looks very powerful. Please introduce it.

I also added a switch to this photovoltaic off-grid system, which allows you to choose between connecting to the grid and using only solar energy, to avoid using the grid when there is no electricity in winter. The conversion time with an AC switch is only 100ms, and the switching is basically unnoticeable, so it will not affect watching TV or using a desktop computer.