Due to various safety requirements,

The 220v AC power cord should not be hung outside the wall.

Even for low voltage lines,

Hanging at the top,

The cross-sectional area of wire of network cable and ordinary telephone line is too small and the strength is poor.

This thread itself can't bear such weight and tension.

Hanging from the top floor to charge the electric bicycle on the first floor or basement,

It can only be an extended low-voltage conductor,

And the charging current is usually a circuit strength of 2 amps,

For the extended total resistance of the conductor,

There are some restrictions,

Especially for lead-acid battery charging,

The output voltage of the charger is different for different charging currents.

When the total resistance of the extension conductor is too high,

Because the initial charging current of the charger is too small,

When the battery is considered to be fully charged,

Starting with the green light,

Charging with low voltage and low current,

As a result, the lead-acid battery was continuously charged for several days,

Charging is not enough.

Even if it is charged with a red light, high voltage and high current at first, the red light will only turn green soon.

Lithium batteries are still allowed to be charged with slender wires, but the charging time is long.

Your environment,

Medium voltage power supply should be used between your high-rise residence and the first floor.

That is, using a lead-acid battery charger with a rated voltage of 48V,

Conductors transmit electricity between your high-rise residence and the first floor.

On the first floor,

There is a switching power supply, which can convert the input voltage from 20V to 60V into DC power supply.

This switching power supply has two charging states: red light and green light, which are usually needed for lead-acid batteries.

Rated output voltage value and rated output current range.

I made it perfect,

For four lead-acid battery cells,

A switching power supply with completely independent output and rated output voltage of 12V,

For each battery cell to be charged independently,

The maximum output voltage of this charger is 14.8V at red light, and the charging current is limited below 2.0A: ：

When the light is green, the output voltage is stable at 13.5V, and the charging current is limited below 2.0A.

There are four such switching power supplies, all of which accept an input power supply voltage of 20V to 60V.

In fact, these switching power supplies ensure that the allowable range of input power supply under output power is 22V to 150V,

The resistance of each switching power supply and the startup chip is automatically completely disconnected after startup.

The power consumption of this disconnection operation is less than 10mW, which is the micro-power consumption level in the real international aerospace field.

More than 20 years ago,

I just realized long-distance bidirectional transmission in this 2-wire system.

With the above engineering technical support,

You can use an ordinary network cable, or

Use ordinary telephone lines for long-distance charging.

Nowadays, telephone lines, network cables and copper cores are generally 0.4 mm in diameter, and there are many network cables, including 4 copper cores and 4 iron cores.

Especially good network cable and telephone line, the copper core diameter is 0.6 mm.

Generally speaking, the extended low-voltage output line of lead-acid batteries,

The total voltage drop of the line should be within 2V (the rated battery voltage is 48V, and if the rated battery voltage is lower than 48V, the total voltage drop of the line will be reduced).

The specific longest line resistance and voltage drop are measured and calculated by yourself.

How to charge the electric bicycle, there is no need to pull the charging cable from the high-rise residential building to the first floor, and there is no AC power supply from the grid on the first floor;

During the day, the solar cell outside the small house is used to charge the intermediate transition battery inside the small house.

At night, use the intermediate transition battery in the small house to charge the battery on the electric bicycle.

Hee hee,

World-class creativity! ! ! !

What are the rewards?

Your question is:

The small storage room on the first floor of the house you personally control can put electric bicycles at night.

However, this small storage room cannot be used from your high-rise residence.

Pull the wires to this small storage room to charge your electric bike.

Because there is no elevator in this house,

You don't want to remove the heavy battery from the electric bicycle.

I worked hard to move upstairs to charge.

A more advanced method is to use a high power density electric energy storage device,

It is transported by elevator from high-rise residential buildings,

The electric bicycle on the first floor,

Charging the battery of the electric bicycle,

This requires a high-performance switching power supply.

Accurately introduce,

For each independent battery cell with a rated power supply voltage of 12V,

Charging,

In this way,

There are only a few completely independent chargers,

Absolute equilibrium! ! !

The most advanced charging method,

If the same is true for lithium batteries,

3.7V or 4.2V, independent charger.

Is the education system in our country backward?

Every country has its own environment and cultural traditions, and it cannot be generalized. MIT's teaching materials and courseware are published online for free, and Chinese people all over the world also volunteer to translate them. Anyone can learn, and there are many people who can be admitted. How many countries can be like him?

I once went deep into students' dormitories to guide students to learn analog circuits for free. I also bought components, materials, LCD panels and computers at my own expense to do experiments for them, help them build mathematical models and guide them to write patent documents for inventions.

General experimental problems, on the spot to guide them to solve. Even for students with good families, they provide non-repayable cash assistance.

If students are really interested in this industry, what do you want to know, what doubts you have and what problems you can't solve, just ask me. As long as I know, have personal experience, know everything and say everything, I will answer immediately without reservation.

I have always wanted to open a free video website to guide students all over the country for free. The school forbids me to use computers, oscilloscopes and servers, and there is no working space at all.

Therefore, we have offended General Hu,

Perseverance after being forced to work.

How to do wholesale business in electric car charger?

Ensure that the circuit diagram is provided free of charge, and have the obligation to fully disclose the design drawings, thoroughly introduce the purchase place of all spare parts, and sincerely explain the test method of maintenance failure in detail! You will monopolize the national market!

Copper wire diameter 1.2mm, conductor section 1mm2, conductor resistance 1.5 ohm, total resistance of 50m 1.5 ohm.

Copper wire diameter 1.6 mm, conductor section 2 mm, conductor resistance 100 m, and total resistance of double-stranded wire 0.8 ohm.

8-core network cable, copper core is thick and thin, and some have 4 copper-plated iron core wires. Even if the diameter of each copper core is 0.3mm, the cross-sectional area of the conductor is 0.07548m2, and the resistance of 100m is 23 ohms, four conductors are connected in parallel to form a strand, and the total resistance of 50m is 5.8 ohms. Connection10m, total resistance 1. 16 ohm.

It depends on what kind of charger it is, whether it is fixed output voltage or three-stage intelligence.

For the charger with fixed voltage output, the DC resistance at the output side can be larger, that is, within 1 ohm, up to 5 ohms.

For the three-stage type, the DC resistance of the conductor is small.

If the lead is long, the battery is not fully charged after charging for more than 10 hours.

For the specially designed charger, you can use the medium-voltage power supply to charge the electric vehicle 100 meters away, the conductor resistance can be 10 ohm, and the small-section conductor can also charge each 12V battery separately. After charging, the charging voltage will automatically decrease, and the charging state of each battery can be telemetered.

This is kung fu.

Kneel for the circuit diagram of 24V30A charger

There are many such products on sale now.

Customize your own high-power transformer. Generally speaking, the output AC voltage is 24 volts to 33 volts, and the power is 1 kw (it should be volt-ampere). Pay attention to draw more heads between the secondary 24 volts and 33 volts.

The simple method is full-wave rectification of the secondary output and direct output to the battery. The ammeter should be connected in series and the voltmeter should be connected in parallel. The output voltage and output current should be manually adjusted by the switch of industrial appliances (rich in Zhejiang Province), and manually adjusted according to the charging process. As for the charger with automatic voltage stabilization and automatic current stabilization, the control mode information of SCR has been published and printed 35 years ago. The simple emergency method is to use a running lamp transformer (36V safe voltage output), an isolation transformer and an electric welding machine transformer with sufficient power to make several turns on the secondary stage and connect them in series in the forward or reverse direction, so as to adjust the output voltage and charging current to a suitable range.

The electric bicycle just got a new battery. It was charged all night last night, and the charger light was still red. Is it a battery problem or a charger problem?

I just got a new battery yesterday. I charged it all night last night, and the charger light was still red. Is it a battery problem or a charger problem?

My old battery used to be red no matter how long it was charged, and it was very hot, so I changed it, but now the charger still doesn't turn green.

The original battery was 10A, but now it is 12A battery. The charger is1.8a. Can you charge the 12A battery?

Supplement to the question:

Originally, my battery was severely deformed before it was replaced, and it was charged 12 hours every day.

There are two aspects to discuss;

First, use a voltmeter to measure the output voltage of the charger under no-load condition.

Measure charging voltage and charging current after charging for more than ten hours,

You'd better buy an ordinary pointer three-purpose meter yourself, measure the voltage on both sides of the charger output terminal at ordinary times, and always pay attention to its voltage change. I bought a universal and special pointer voltmeter, connected in parallel with the charger, and continuously observed the change process of charging voltage. As for the normal range of charging voltage, there are many pages full of articles on the Internet. Please look for it yourself.

The above work is to judge whether the output voltage of the charger is out of control.

Because the Jianghu book Zhuo Jun forced me to be laid off, the following contents are briefly introduced;

Even chargers that meet the factory standards in China, even those three-stage smart chargers and even computer-controlled chargers are all charged in series. After several charge and discharge cycles, the voltage and capacity of each battery will become more and more different, and the usual fault phenomenon is partial expansion. If the old and new batteries are used together, the probability of this failure is higher and more frequent.

Therefore, if possible, we should prepare a separate charger for each battery. This is a comprehensive consideration of charging the battery of electric bicycle from the downstairs of high-rise residential building!

In particular, that char process of each battery is independently remotely control and telemetered.

I have long experience here. For example, there is a universal charger upstairs, and there is an ultra-low voltage drop charging controller built with discrete components on the electric bicycle.

You should find those top candidates in the college entrance examination, graduate students in integrated circuit design and doctoral supervisors to solve your actual needs. Their monthly salary is more than 10 thousand, and I am the place to receive social relief.

This design for high-rise building downstairs battery charging and remote charging,

Medium voltage and low voltage transmission are adopted, and the ultra-low voltage drop circuit, remote control and telemetry circuit are constructed by completely separated components.

Try not to use single chip microcomputer, reflect high-quality design ability, realize time sequence control, and automatically adjust charging voltage and charging current.

48V 1.8A charger for electric vehicles, can I use 48V2.5A or 48V3A charger after the output terminal is extended by 30 meters?

Because I live on the fifth floor and the electric car is on the first floor, it is very inconvenient to charge.

If you use the original charger, the battery will often not be fully charged after extending the output terminal of the charger (it is not very safe to extend the 220V terminal)!

This is a specially designed charger.

One of my ways is to increase the output voltage of the existing charger, and there is another coordination circuit on the bicycle. Because there is actually a requirement for voltage reduction at the end of charging, the perfect circuit should be specially designed, and the specific design details and complete drawings and test data may not be released until 5 to 10 years later.

Now more than 100 drawings have been accumulated, all of which can be used, each with its own advantages and disadvantages. Its formal design should have a profound and accurate understanding of the circuit.

My actual test reached the distance of120m, and the medium voltage transmission in safe voltage was adjusted to the end.

At present, remote charging voltage and charging current lines are also used, which is a perfect way to charge each battery separately.

There are no related products on the market.

I have been charging electric bicycles downstairs in high-rise buildings for a long time and have rich experience.

In order to ensure the battery life and transmission safety, we should use ultra-low voltage drop charger. I use the ultra-low voltage drop linear stability guarantee circuit assembled by fully discrete components, imported ultra-low voltage drop linear integrated circuits and switch modulation integrated circuits.

The problem you expressed is due to the low design level of the general electric bicycle charger and the pressure of cost limitation. For high-energy batteries, continuous detection of battery temperature rise is emphasized; For lead-acid batteries, its tolerance is much stronger. If the temperature rise of lead-acid battery is too high when charging, it means that it has been overcharged, which is very serious.

It is common that the charger can't jump the lights automatically. The simplest method is * * * *, manual monitoring, and * * * * floating charging voltage in time according to the actual situation; The obstacle is that the charger manufacturer keeps the line secret now, and it will take several days to carefully read the assembly and distribution of the line, then redraw the circuit diagram through reverse engineering, and then make modification measures.

The greater difficulty is that the method of charging several batteries with rated voltage of 12 volts in series has serious defects. After dozens of charge and discharge cycles, the capacity and voltage of each battery are more and more different. Even if manual intervention is used to charge, it is still a drop in the bucket.

Helpless, anxious, unable to help.

The complete solution is that each battery is equipped with a charger, and each battery has * * * * * * continuous monitoring. This charger is not the current three-stage charger, nor is it the "computer intelligence" charger advertised by enterprises.

I have always wanted to make the relevant design and a large number of test data completely free. You want Ye 87 Qin, Hu 87 Jun, Jiang 87 Shu 78878 Zhuo to open a free teaching network and the publishing houses they are in charge of.

What brand of electric car charger is of good quality? I want to be an agent in this field.

To tell the truth, none of the famous brands can reach the highest function, performance and index in the following countries.

And those big brands are profiteering products! The selling price of their products, according to the normal profit rate, can achieve the following effects. It has been suggested to a university science and technology service company that they cannot realize their technological innovation and market potential, especially to create new market space.

Now it is not produced, sold or frozen.

If necessary, you can contact through the network management, and perhaps you can authorize production. There is no direct and inevitable connection with economic interests, and there is no prerequisite. Legally speaking, you can consider free.

The following is not a positive answer, but a summary of several other answers. Understand it slowly.

If there are products with similar functions at home and abroad, you can attack again.

If you can't find it, attack the big brand charger.

In particular, those manufacturers and users who do not give circuit diagrams, assembly drawings, patch installation, maintenance, accessories, test conditions and test results, fault characteristics and treatment and maintenance methods cannot be adjusted and modified.

What is the intermittent oscillation of the charger power supply for electric vehicles?

Usually the output is short-circuited! It is equivalent to the effect of burping and is a safety protection measure designed by foreigners.

It depends on whether the voltage level does not match, whether the output current is small, whether the battery capacity is too large (this possibility is very small, because the normal charger limits the maximum output current), and whether it is overloaded.

I did it. I use them for my own use and never sell them.

If you want to know the truth, I will answer you directly. Now 20 yuan to buy a new charger, garbage.

Big brands sell for 100 yuan each, which is very profitable, and these mass-produced patch technology electronic products,

It also works in high-voltage frequency converter, which is easy to be scrapped and cannot be maintained.

The traditional transformer, 100 yuan, is very reliable and not accepted by the market.

Switching circuit inverter, the low price from 70 yuan to 50 yuan, can not be lower, consumers can not understand,

Moreover, the battery is durable and saves investment. To take this road, we have to design and produce special integrated circuits, and there are no analog circuits and switch circuits in China.

In a word, China is a society where a large number of manufacturers have been bargaining and oligarchs are selling at high prices. These products are all electronic waste, and the charging effect is poor. No one can make powerful and reliable products.