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Questions tagged [discharge]

The process of removing energy from a store, such as a capacitor or battery. Stores may be parasitic, resulting in rapid spontaneous accidental discharge, as in a static shock.

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36 views

battery fully discharging [duplicate]

My goal is to use my laptop, a pioneer dj controller and 2 krk rokit 5's (50W class-AB amplifier boxes) for a party all at the same time for about 6-8 hours in a place without access to grid power. ...
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2answers
60 views

Current in charged RC circuit

I've the following circuit: simulate this circuit – Schematic created using CircuitLab The capacitor is charged up to 10 V according to the following formula (when the switch is closed): $$\...
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11answers
4k views

How to safely discharge oneself

At work I have the problem that I seem to collect a lot of static charge as soon as I leave my desk and return. I am not quite sure why this happens. Strangely enough the effect is stronger the ...
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2answers
37 views

Removing a charged coil from circuit

I have a question: If I charge a capacitor through a resistor and remove it from the circuit, the capacitor will be charged for a certain amount of time (eventually the voltage across the capacitor ...
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0answers
81 views

Right cable for high-current (10 kA) discharge

I need to discharge a 80 nF capacitor, which potentially charged to 10 kV. I am using a HV resistor, 1 Ohm, wherefore the RC of the discharge circuit is 80 ns. What kind of cable (gauge?) should I ...
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2answers
88 views

How long does it take 1mA discharge current to discharge 24V 35Ah battery down to 8V

I am using a circuitry which has to be connected to 24V battery at all times. The circuit works 8-32VDC so it will be OK down to 8V. How long does it take 1mA discharge current to discharge 24V 35Ah ...
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2answers
54 views

Calculating charge given current and capacitance over time

I it possible to calculate the charge on a capacitor when only having the current, time and capacitance value? I tried using this formula to first calculate the voltage and from there the charge. ...
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2answers
65 views

Can I connect 10 AWG wire carrying up to 25 amps to 10 parallel 1 ohm 10 watt resistors?

I am trying to measure the charge capacity of some LTO battery cells. To do this I want to discharge each battery cell from 2.5 V to 1.7 V. I am going to measure and log the current over the discharge ...
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0answers
51 views

How to switch between charge and discharge?

I want to make my rpi 3 portable with adding a rechargeable battery pack to it. I have 6 Li-ION batteries that are packed together in 2 series rows of 3 batteries in parallel(each battery is a 3.7 ...
0
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1answer
18 views

CSB batteries Constant Current Discharge Characteristics

I'm comparing batteries for use in UPSes and during my tests I was consulting the datasheets of 2 manufacturers. The datasheet from SunLight is crystal clear but CSB's datasheet is using terminology ...
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1answer
67 views

Does wiring 18650 batteries in parallel and/or series increase the discharge rate of the whole pack?

I cannot seem to find a solid conclusive answer anywhere on this, but if I build a pack of 6 18650 batteries in parallel which are 3500 mAh each, that would make the pack 21 Ah in total. Then I take ...
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1answer
89 views

Will this capacitive discharge welder design work?

I'm an electronics newbie trying to learn about the subject through tinkering, and my current project is a capacitive discharge welder for welding on battery terminals. I thought I'd better have ...
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0answers
17 views

X2 capacitor discharge/bleeder

My application has a High voltage battery (close to 530v) which is then connected to a DC DC converter that has a input X2(30µF) capacitor. My question is about the bleeder resistor design. Would ...
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0answers
9 views

Battery Discharging and Effect on Lifespan

I have noticed that some times during the day when my solar system panel is shaded it starts using the battery bank power (a few ampers) for a few seconds and then recharges the battery after the ...
2
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1answer
111 views

Actual lifetime of 18650 cells

For a project, we are currently looking at how long we could use battery cells, such as the LG 18650MJ1 at maximum discharge and maximum charge in 25°C ambient temperatures. Basically, in this case, ...
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1answer
50 views

What is 'DOC' in terms for Depth of Discharge for SLA batteries?

I'm trying to understand the spec of a SLA battery. There's a chart which is titled "Cycle Life in Relation to Depth of Discharge": Can I ask what 'DOC' stands for and the chart is read? How come ...
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2answers
70 views

Discharging a capacitor with an analog switch

I'm designing an op amp integrator with a 100nF capacitor, and need to include a logic level reset/discharge option. I would like to use the DG467 analog switch due to its low cost and small package, ...
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1answer
72 views

Calculate battery discharge time to a certain voltage value [duplicate]

Let's say I have a 14.8V battery with capacity of 5200mAh. My load constantly draws 20 amps from it. I want to estimate the time it takes until the cell reaches let's say 10V. This is just an example, ...
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2answers
86 views

How 18650 cells capacity is measured (what are the amperage and cut off voltage params)?

I have lots of used Li-Ion 18650s. I want to test their capacity. There are however 2 important parameters that I cannot find anywhere which is amperage and cut off voltage. Some people use 500mA ...
11
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3answers
331 views

How much do lithium polymer batteries expand in volume?

I'm designing a device with a small lithium polymer battery (4x12x30 mm, 120 mA-h). Looks like this: I've heard that there is a rule of thumb that the space left for the battery in a case should be ...
0
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1answer
41 views

Battery Management System (BMS)

Suppose that a lithium-ion cell having total charge capacity Q=10Ah is discharged at a rate of 1A for 30min. What is the net change in the cell's state of charge (in percent)? Round to the nearest ...
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1answer
51 views

Battery charger/discharger using N mosfet only

I want to make a battery charger discharger with an arduino, to be able to plot graphs. And afaik N mosfets are better in terms of Ron and cheaper and easier to ...
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4answers
204 views

What happens to the energy stored in a short-circuited capacitor?

Suppose we have an ideal capacitor with a certain voltage between its plates. We connect the two plates using an ideal (lossless) wire, so the capacitor discharges. Where has the energy having been ...
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1answer
75 views

LTSpice - Capacitor Charging/Discharging Circuit not working right

I am trying to do a charging and a discharging Circuit. R8 is the load that Capacitor C1 needs to discharge into when P12V_IN is low. My question is Why is Vsolenoid low in the interval shown on the ...
0
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1answer
38 views

LTC 4150 coulomb counter property

I want to monitor the capacity of a 7.4V, 2200mAH Li-ion battery. I have found a that LTC4150 coulomb counter can able to measure the battery capacity. So, suppose I have connected a fully charged ...
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3answers
1k views

Discharge time of 12 V 8.4 Ah at 5 mA

I have a motorcycle battery rated as 8.4 Ah (20 HR). It also says 8 Ah (10 HR) and I am not sure what the difference is. Anyway, I have a GPS tracker fitted with a rated ...
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3answers
67 views

Corona discharge insulation

If a wire is insulated from arcing up to 10 kilovolts, is it insulated up to twice that much from corona discharge? Because I’m imaging that for corona discharge to occur, the electricity has to flow ...
0
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3answers
73 views

Can I put Li-ion batteries in series and discharge them at different voltages?

I need to run a pump (drawing 95mA at peak flowrate) at +14V and the rest of my circuit runs on +3.3V. To save on battery costs, I was thinking of purchasing four 18650s at 3.6V 3500mAh per cell and ...
6
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3answers
275 views

In the recent Con-Ed transformer “fire”, what exactly produced the color of the huge blue glow over New York City?

Blue is often linked with technology (e.g. "big blue", glowing pools of water with Cherenkov radiation, aliens in general, Nobel prizes for blue LEDs) as well as traditional things like sparks. In a ...
2
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3answers
307 views

Why does a capacitor not discharge in the same cycle it is charging in a clamper circuit?

As far as I understand, in an AC circuit, a capacitor is supposed to charge as the voltage is increasing, and as soon as the voltage starts decreasing, the capacitor starts to discharge (Since it will ...
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2answers
968 views

Shorting a high voltage electrolytic - damaging?

I have a high voltage (400V) electrolytic capacitor, and I sometimes discharge it by shorting the terminals with a screwdriver. I get a fat spark and a bang. However, apart from minor damage to the ...
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1answer
33 views

Depletion Mosfet as current source to power load

I came acros the following application note for a Depletion Mosfet (https://www.infineon.com/dgdl/Infineon-Application_Note_Applications_for_Depletion_MOSFETs-AN-v01_00-EN.pdf) and i got intrigued. ...
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1answer
161 views

Does voltage drop with discharge?

Does voltage drop with discharge? Since voltage is the potentiality between two charges to re-balance (from my understanding). I mean, once all charges are equally shared between both capacitor ...
0
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1answer
45 views

Selecting the Power rating of resistor

In a circuit I design, there is a moment, when a capacitor should be discharged through a resistor. The power dissipated in the resistor has the format of the screenshot in the LTspice. Should I ...
0
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1answer
46 views

Question about a high voltage setup/scenario

I was wondering what would occur in the following setup. Say you have an circuit basically like this: V1 is a source of high voltage (high enough for corona discharge to occur), and no current can ...
4
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2answers
518 views

Is Non-Passive Cooling bad for Lithium Ion Cells?

I'm in the process of designing a device capable of charging, discharging and testing internal resistance of 18650 cells. My device will be capable of testing 100x 18650 at the same time, each will ...
0
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2answers
102 views

What if the current draw is greater than the rated discharge of a battery?

I have a 48 volt, 20 kW motor that I need to supply with power. I am looking at a configuration of 16 LiFePo4 cells each in series, each 200 Ah rated at 1 C. At that rated capacity, it would seem ...
0
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1answer
75 views

12 volt 8000 watt battery discharge protection

We built a home in a country where electricity is a rare ressource. In order to have energy available all day we bought a bunch of solar panels and several 12 volt batteries. We then used a 8000 watt ...
2
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1answer
207 views

Why Peukert's law is always ignored in battery(lead Acid) guides available on Internet?

I am doing battery calculations for off-grid solar panel. I don't get that why battery guides on Internet always ignore Peukert's Law for batteries of solar panel. I want to have good approximations ...
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1answer
68 views

Determine the voltage drops across the capacitor

I am having troubles with one type of tasks when preparing for an exam. I think I get the way to solve it when t = 0, but I don't really know what my approach should be when t>0. Task: That is how ...
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2answers
507 views

Maximum discharge rate of coin cell batteries

I am trying to figure out the maximum current I can pull from different battery types. Cursory research suggests this isn't a commonly reported values, maybe it is close enough to the capacity such ...
0
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1answer
48 views

How does this circuit works for detection of Logic low, Logic High and Hi-Impedance state?

I was working on a design of Li-ion battery charger using LTC4001. Here a pin is called CHRG, which indicates the different state of charging like charging cycle begins, threshold reach(i.e 4.2V or C/...
0
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1answer
55 views

Trying to solve a RL circuit by hand but simulator calculates a value I do not understand

I have this circuit. V3 is just a trigger to close the switch, just ignore it. The switch is open for a long time. So, the left part of the circuit is working for a long time and the inductor is ...
0
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3answers
242 views

Low power switch input with MCU wake-from-sleep interrupt?

Im trying to read the falling edge of digital logic input to wake up a microcontroller. Below is the circuit I have used. There is an RC filter to provide a ~5ms debounce time, and a 100K pullup so ...
0
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2answers
88 views

LEDs + Constant Current Driver - Discharging the Circuit

I have a project where I made a series of high power Osram OSLON blue leds using custom boards on aluminium PCB. I just put 16 LEDs in series and joined them to an appropriate constant current supply. ...
0
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4answers
263 views

Power green LED from microbial fuel cell (MFC)

I am looking for a way to power green LED (like GNL-3012GD) from MFC which provides 0.2mA @ 0.6V for about 1hr (there should be some drop off period then; 2..3hrs to restore). I understand that the ...
0
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1answer
152 views

18650 cells - Unable to measure capacity

I got many 18650 batteries from notebook batteries and I want to test their capacity by my Turnigy Accucell 8. My problem is, that when I start discharge program (0.5A what is from battery datasheet) ...
0
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2answers
141 views

18650 discharge protection

I've converted an existing 18v DC battery pack (for a power tool) to use replaceable 18650 cells. My plan is to charge the cells in a "smart charger" and discard the OEM charger. I'm only getting ...
0
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1answer
194 views

Max Discharge Rate of typical Alkaline Button Cell Batteries

I have simple circuit that has some led diodes, 3 LR41 batteries and no resistor. By looking at this website, it seems their capacity is about 30mAh. But I couldn't find anywhere the max discharge ...
0
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0answers
86 views

Designing a Lipo Charger for 1 or 2A charge, 5A discharge

I'm looking for/designing a Lipo charger which can handle a discharging current of 5A at 5V. Obviously, the lipo's charge is 3.7V (max 4.2V, min 3.2V), so most charging circuits inside a power bank, ...