Unanswered Questions
595 questions with no upvoted or accepted answers
4
votes
1
answer
97
views
Solar panel for 6 V, 1100 Wh battery
I have a sensor in a remote area that draws 15 mA @ 6 V for 16 hours each day, powered by a 6 V, 1100 Wh low discharge battery. I'm trying to achieve around 2 years of autonomy.
Daily consumption is 1....
- 53
3
votes
0
answers
434
views
Is a single Schottky diode adequate to support power-path in a basic USB -> LiPo charging circuit?
I'm working on a hobby project based on the ATmega32U4. I'd like to be able to power the device by USB or LiPo battery. I was looking at the schematic for the LilyPad ProtoSnap Plus and saw a diode ...
- 626
3
votes
0
answers
422
views
Adding an adjustable constant current option to a LM5175 circuit
Disclaimer: I'm no electronics engineer and I have no experience in this kind of circuit! I do occasionally design simple analog circuits and PCBs, barely messing with opamps.
Context:
I'm about to ...
- 131
3
votes
2
answers
171
views
Wind-powered fairy lights + battery charger: preliminary help
I'm new here and asking for help designing a yard-art project. I would like to use a small DC motor as a wind-powered generator to charge a battery (with overcharge prevention) and run some battery ...
CommunityBot
- 1
3
votes
0
answers
1k
views
TP4056 and ST32F103C8T6 shorting after few uses
Complete schematic:
Top part:
Lower part:
This is the circuit schematic, top part is sensor, bluetooth, microcontroller, oled and pins related all working from 3.3v coming from regulation of a ...
3
votes
0
answers
388
views
Sense resistors in system-side Li-Ion charger/gauge circuit
I'm working on designing a charger and fuel gauge circuit for a premade 3S3P Li-Ion battery pack. The battery pack has basic protection circuits onborad (over/undervoltage and a PTC) and only the pack ...
- 1
3
votes
0
answers
60
views
bq24171 battery charger does not charge
I want to make a 2S LiPo battery charger. I used the bq24171 chip from TI and followed the datasheet. All the conditions to enable charging seem to be ok but there is no actual charging (no output ...
- 31
3
votes
0
answers
106
views
Ultra low power battery
I am currently in the middle of a project and I am quite unsure of what type of battery and battery charger I should be using. To be honest I have never worked with battery or battery charger yet.
In ...
- 17.9k
3
votes
4
answers
149
views
Advice for a Solar Charger and Battery Project
I am a high school robotics teacher (no formal engineering training) and I am taking a group of students to Kenya this summer to work with high school students there. The organization we are ...
CommunityBot
- 1
2
votes
0
answers
49
views
LI-ion charging: Should I turn off the charging circuit to measure battery voltage?
I'm working on a 120VAC smart sensor product that contains a single internal soldered-on LI-ion cell to provide backup power for up to 24 hours after power failure with reduced functionality. I know ...
- 153
2
votes
1
answer
134
views
Battery thermal protection circuit
I'm trying to design a circuit to be used with some 12V LiFePO4 battery packs which don't have an integrated heater, so I can add thermal protection.
The circuit would sit between a 65W solar charge ...
- 151k
2
votes
1
answer
84
views
2S li-ion charging
Would it be possible to charge 2S li-ion battery with MacBook m2 charger which can output 20V 1,5A or 15V 2A or 9V 3A or 5V 3A. I am planning to use this Li-ion Lithium Battery 18650 Charging and ...
- 22.8k
2
votes
0
answers
106
views
Detect battery type (NiMH, 14500, alkaline) and only charge the rechargable types
I'm building a flashlight that uses AA size batteries. I want to automatically detect the battery type and charge it with the appropiate method, and also detect alkaline cells so it won't try to ...
- 9,270
2
votes
0
answers
87
views
Why is is OK to use a relay to parallel lead-acid battery banks for charging?
I am currently faced with a British-built, Lloyd's offshore certified sailing yacht from 1998. Everything seems to be well-thought out and of the highest build quality. I am thus assuming that their ...
- 72.5k
2
votes
0
answers
896
views
Is the JEITA battery charging temperature standard accepted by EN62368-1?
EN62368-1 Annex M.4.2.1 mandates that the battery charging circuit shall 'stop charging' when the temperature of the battery exceeds the highest specified charging temperature (typically 45°C). ...
- 9,270