All Questions
40 questions
0
votes
0
answers
43
views
How to connect a switching power supply to a converter with 2 inputs and a BMS?
I am building a circuit for an EV with a capacitor and need help connecting the switching power supply with the BMS and converter (The highlighted part). The switching power supply needs to be ...
0
votes
1
answer
49
views
making a long lasting battery pack for 24V/0.5A
I brought a stereo equipment from Japan that uses a wall-wart set at 24V/0.5A.
I would like to replace the PS with a long-lasting battery pack, but all I can find are 12V/5A batteries, or 24V/5A. I do ...
2
votes
1
answer
636
views
NTC wire in a replacement LI-ion battery has a different color [closed]
I am replacing a battery pack in a speaker. It is a Li-ion 18650 2600 mAh 7.4 V. I got a replacement from a shop in China claiming to be local. The replacement has an NTC and three wires just as the ...
- 23
0
votes
1
answer
578
views
How to properly wire fuse block, DC-DC converter, and load
I have a battery, a fuse block, and three PCs (Raspberry Pi.)
Is it better to have three separate DC-DC converters in front of the fuse block with the battery directly connected to the fuse block or ...
2
votes
3
answers
9k
views
Powering 24 V and 12 V device simultaneously from two 12 V batteries
I have two devices which need to be battery-powered (remote area, no grid power available). One device requires 24 V, the other requires 12 V. Both are very low amperage (~50 mA).
Can I use my two 12 ...
- 121
0
votes
3
answers
921
views
Identifying risks working with motorcycle wiring
I recently bought some light accessories to add to my motorcycle in order to increase visibility and safety. I was planning to have a motorcycle shop install them, I usually am willing to DIY things ...
- 103
0
votes
1
answer
84
views
I Need Help Making a Weird Custom Flashlight
As said in the title, I am trying to make a homemade flashlight. I have no experience when it comes to electrical engineering and I have a very basic understanding of this stuff. What I am trying to ...
- 3
0
votes
1
answer
59
views
Best way to switchover between 2 power supplies?
So I was trying to think of a way to make a circuit reversible across a DC-DC charger
See diagram below, it will normally be on case 1, but in some circumstances, it will be need be on case 2
The ...
- 1
2
votes
2
answers
593
views
Debate on wiring risk of positive/negative wires along a path
I came across a design of a battery pack. As you see on the photo, the red wire is positive and black is negative.
The red wire lays across the top of the battery pack and comes to the connector.
One ...
- 91
0
votes
4
answers
171
views
How do you wire something that opens
I am trying to create a box that has a UVC light in it. I am going to have the light on the top of the box, this part will open up. The issue is the batteries and parts are at the bottom of the box ...
0
votes
0
answers
107
views
help verifying battery schematic
The diagram below is for wiring up a 6 cell laptop battery. Visually, there are four batteries in one row, and two batteries in a second row. The cells are the usual 3.7v 18650 cells. I am pretty sure ...
- 143
1
vote
1
answer
8k
views
How to power solenoid valve?
I'm pretty new to electrical work in general and was wondering how I would open and close a solenoid valve. It says on the specifications that it needs 12 VDC. Do I just take a 12 volt battery and put ...
- 325
0
votes
1
answer
1k
views
How would I wire this battery to the tablet?
I purchased a replacement batter for an old tablet -- and was prepared to follow the instructions to install it.
Unfortunately, the replacement-battery comes with wires coded differently -- whereas ...
- 101
2
votes
1
answer
160
views
Wiring problems on the TP4056 Module
I have been thinking of putting a 18650 Li-ion battery salvaged from an old laptop power battery to use so, I bought a few of those cheap TP4056 battery protection and charge circuit modules and I am ...
2
votes
3
answers
2k
views
Is it safe to bypass a battery?
I have an old camera which Im tinkering with and when I opened it up I found that the battery (liPo) is puffy. As I dont have a spare I can't replace it and Im beginning to doubt myself that its safe ...
user248702
0
votes
1
answer
61
views
Trying to understand schematics
I'm making a guitar pedal project, and I have a very basic understanding of electronics, so I'm having a hard time understanding some of the logic behind the schematic I have.
Why would I need to ...
0
votes
2
answers
815
views
Can I use a DC battery cable rated at 600 A to connect a 63 A main AC breaker to a 40 A RCCB in my distribution panel?
I've read that for low-voltage (less than 400 V) applications, the main difference between DC and AC wire is basically in the (temperature) rating of the cable sheath.
If this is true, then the ...
- 1
3
votes
1
answer
1k
views
2S 18650 Li-ion battery pack conundrum
I recently bought a remote control toy for my son which included 2 2S battery packs, with a single SM-3P plug, and a corresponding USB charger as shown here.
Initially, the car worked fine, though ...
- 159
0
votes
1
answer
187
views
Battery connector and wire ampacity
I’m considering using a JST ACH connector with my LiPo, but I don’t understand whether the current rating on the data sheet is for aggregate or for each wire individually (which is my guess since they ...
- 407
2
votes
3
answers
659
views
Please help me understand how to add AC power to my DC device
I have a device that runs off of three D batteries. I would like to be able to add a power cord so that I can plug it into the wall and run it off of that instead. I would also like to still be able ...
- 121
1
vote
0
answers
1k
views
help building 6S2P balanced Li-Ion battery pack
I'm trying to build a 6S2P balanced Li-Ion battery pack for a quadcopter using LG 18650 HG2 cells with pre-soldered nickel strips (1st image) so that I won't solder directly on the cell's terminals.
...
- 11
0
votes
1
answer
613
views
5V Step Up Converter Drops Voltage to 2.3 Volts when Connected to Device
Recently I combined two 18650 batteries in Parallel, and attached the output of the Paralleled 18650 batteries to a 5V Step UP Converter.
Device draws 5V 4a.
Here is a picture to the step up:
...
- 412
0
votes
1
answer
310
views
What is the best battery configuration for a solar powered electric fence setup?
I have two solar panels: SunWize SW-85P; 85W max power, 5.1A, 16.7V.
I have a charge controller: SOLAR BOOST 2000E.
I have four 12V batteries: two Interstate SRM-24 (couple years old), two CarQuest ...
1
vote
2
answers
794
views
Battery Pack Design: Charging Parallel 18650s Through a Step Up Converter and BMS
I taken the necessary precautions in creating my own custom battery pack: I bought two 18650s from the same shipment and will attach a diode from each positive end of the 18650s before attaching the ...
- 412
4
votes
2
answers
8k
views
CMOS/RTC battery standard connector type?
Most CMOS/RTC batteries have a standard connector type, however after exhausting tons of time searching I cannot seem to find the type of connector these use.
It's a 2 pin connector with 1.25mm ...
- 61
1
vote
1
answer
1k
views
Multiple 2kW inverters connected to same 12V battery bank
It seems that putting 4kW over a 12V DC circuit is unwise, given that this would exceed the maximum of 302A for which 0000-gauge wiring is rated for power transmission. However, is it safe to connect ...
- 241
1
vote
0
answers
27
views
Suggestion about Peltier Efficiency With Current Power Setup [duplicate]
I am currently using the very arbitrary TES1-4902 to cool water (small amounts) using a 5V 2.4A USB Battery Pack (2 Peltiers TES1-4902, 2 5V 2.4 A USB Battery Packs = 5V 4.8A)
Recently, it has come ...
- 412
4
votes
3
answers
3k
views
What gauge wire do I need to connect a 3.7V 750 mAh LiPo battery?
I originally thought that I could use any type of thin wire, but after some research, it seems that different voltages and milliamps require different size wire. Am I correct with this?
My question ...
- 93
0
votes
0
answers
231
views
Correct Series/Parallel 12v SLA Wiring?
Is this an optimum wiring scheme for draining and charging seven 12v SLA batteries of different amp hour ratings wired in series/parallel for 72v 28ah output?
(powering a scooters speed controlled 1....
- 101
1
vote
1
answer
753
views
LiPo battery protection circuits
I have a Pi Zero which i need powered by a large lithium ion/polymer battery. I would like to avoid paralleling 2 or more cells because if balancing issues causes a fire, certain chestnuts will most ...
- 117
0
votes
1
answer
386
views
How to create a simple circuit with a torchlight, 2 AA batteries and a voltmeter?
NOTE: I AM A TOTAL NEWBIE ON HOW ELECTRICITY AND CIRCUITS WORK, SO STEP BY STEP WITHOUT TOO MUCH COMPLICATED LANGUAGE WOULS BE GREAT
Hi, I'm currently a middle school student and wanted to perform a ...
- 109
0
votes
2
answers
236
views
Cautery Pen.. plug in?
I'm interested in turning my cautery pen (one of those with the replaceable batteries) into something that's DC powered through an AC adapter.
I've figured out the internal wiring for the pen, and ...
- 1
1
vote
3
answers
1k
views
What wire would I need for 24000 watts (48v @ 500amps max) of DC power?
I have four batteries in series, 48v and a 500amp controller.
Right now, I am using standard amplifier battery cables, I believe they are 0 gauge.
Operational performance is not as good as suspected ...
- 155
0
votes
1
answer
837
views
AAA battery to power a usb device?
My mouse died recently. Specifically the cord. What ive wanted to do for a while now and have an excuse to do is to try to get the mouse to run via bluetooth. Im a first year engineering student at la ...
- 101
2
votes
1
answer
294
views
Sanity check my DC Solar system diagram
I'm building out a camper van with a solar powered electrical system.
My electrical knowledge is limited to a collage physics and an embedded systems class, so I would really appreciate it if I could ...
- 139
0
votes
3
answers
75
views
Wiring question [closed]
I would like to take a 96 LED Infrared light (12v 2 amp) and cut the cord and add a battery wiring harness. Can I just add two 9v battery wiring harnesses to it? I'm pretty confident that I could add ...
0
votes
1
answer
536
views
Wire size for battery interconnects
I'm putting together a bank of 3 batteries, connected in parallel for use in a solar PV system. The primary load will come from a 1000W inverter (2000w surge). The inverter manual recommends using a ...
- 3
2
votes
3
answers
2k
views
Battery Wiring - 3 Independent systems with common ground
Background: Building a radio control wheel bot. Using a motor controller that recommends independent power supply for 1.) power to the controller and 2.) power to the motors. Also want a 3rd power ...
- 21
0
votes
4
answers
10k
views
Wiring Emergency Stop button to disconnect two independent circuits
I am trying to use one emergency stop switch to disable two batteries that function in independent circuits. My circuit diagram is attached below. A motor controller connects to each of the exposed ...
- 79
-1
votes
1
answer
2k
views
Multiple Power Sources and a Single Power Switch
I have a team and we're building an RC robot of sorts for a college competition. We require wireless video power source, Motor power source and Arduino power source.
The Arduino will run off of a 9v ...
- 99