All Questions
43
questions
0
votes
2
answers
38
views
Boost converter two different voltages (9v/12v) from 3.7v battery, attach both to battery, or daisy chain off 9v
I'm sure this has been answered plenty before but I cant seem to get the search terms. I'm wanting to use a 3.7v battery to power a small 9v device and a 12v device at the same time using a boost ...
0
votes
1
answer
93
views
What is the "best" way to make a diy 7v rechargeable battery?
I have a device (the wii "sensor" bar, basically an IR LED array) that the literature says takes 7v. I can't find any battery offerings that come in 7v, but many that are 3.7v, so I am stuck ...
- 141
0
votes
1
answer
46
views
Battery consideration and topology choice
I have a system with a battery. I do not know what will be the battery at the moment. And so I can select the voltage battery in function of my system. I need to regulate a voltage (15 V) thanks to a ...
- 2,434
0
votes
3
answers
93
views
Does DC-DC 24V-12V waste less power than AC-DC 220V-12V?
I am modifying an existing UPS to allow for a longer backup time. I plan on adding a cooling fan along with an external current controlled power supply to charge the larger batteries. There are some ...
2
votes
2
answers
686
views
How much charging ripple voltage is allowed while charging a LiFePO4 battery?
We are designing a buck controller to charge a LiFePO4 battery (4 series 9 parallel cells, each of 3.2 V).
Hence, we would like to charge the battery pack with 13.90 V but the buck output has got a ...
- 29
1
vote
3
answers
112
views
Unable to start and run 12 V DC pump, only jolts
I have a 12V 19 watt DC water pump (800LPH), A 12 V DC step down converter, and two Dewalt batteries.
One at 18 V 5 Ah, other 18-54 V 9 Ah.
I've connected pump to step down to battery correctly, but ...
- 23
0
votes
0
answers
58
views
Using 2 LiPo Batteries via 2 Buck Converters for External Notebook Power Supply - will it work?
I have an old ThinkPad X220T notebook of which the internal battery is broken (and removed).
To get my notebook working on the go again I want to build an external portable power supply with 2 LiPo ...
1
vote
2
answers
721
views
12 V, 18 Ah battery for a solar panel
I have a 100 W solar panel. I bought a 12 V, 18 Ah battery with a 30 A PWM solar controller. How can I get this to charge right? The current will be too much for the battery. How can I cut down the ...
2
votes
2
answers
6k
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
2
answers
641
views
Why does the voltage of a 18650 battery drop when connected to an LM2596 module?
I am trying to get a 5V output out of a 2S 18650 cells (getting a 7.5V from them.)
I am trying to use a LM2596 module, but as soon as the battery is connected to the LM2596, the input reading goes ...
- 1
-2
votes
1
answer
139
views
Does a voltage limit in a battery increase amperage over all? [closed]
I have an 18 V battery with a 4 Ah battery. If I limit the voltage output to 9 V with a buck converter or voltage regulator, how would limiting the voltage affect the amount of current output?
- 1
0
votes
1
answer
536
views
Choosing TVS diode
We have a a project where there a system powered by 13s Li battery - 54.6V max voltage of pack. The buck regulator we're choosing for this has an absolute max of 76V. For this we're considering two ...
- 597
-3
votes
1
answer
274
views
Paralleling of battery chargers [duplicate]
Can we parallel the bbattery chargers suppose buck controllers.Two buck controllers taking power supply from the same power bus. The output of each controller will charge the batteries connected at ...
2
votes
1
answer
604
views
Why is LM2596 buck converter output current low when used as a mobile charger? [closed]
I have a LM2596 buck converter which is capable of providing 3 A and my input source, which is a transformer, is capable of providing 5 A.
When I use the buck converter to charge my Android phone ...
- 131
0
votes
1
answer
45
views
High Current Buck Converter with wide input voltage [closed]
I'm currently building a powerbank with PD outputs that are capable of outputting 5 amps at 20 volts, but my battery pack is 33.6V (8S Li-ion). I've managed to find a possible buck converter IC (...
- 3