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3 votes

Why not always connect cells in series to increase voltage in solar component setups?

Talking about a 2, 3, or even 6 kW system, I see a big problem with 12V DC systems is the enormous cable thickness Well yes. The advantage of 12V is safety versus electrocution and it also works well ...
bobflux's user avatar
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0 votes

Why not always connect cells in series to increase voltage in solar component setups?

You can follow the instructions of my project, see photo:
Franc's user avatar
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1 vote

Is it okay to raise the output voltage of a 5v charger to charge a laptop battery whose charger supplied 15v (with a step up module)

You are forgetting to calculate power. 15 V × 4 A = 60 W 5 V × 2 A = 10 W You would be way short of power before you consider the losses of your voltage step-up converter. Remember that when you ...
Transistor's user avatar
  • 176k
2 votes

Is it okay to raise the output voltage of a 5v charger to charge a laptop battery whose charger supplied 15v (with a step up module)

No, it is not OK. You are forgetting that the 15V power supply is just a power supply. You cannot connect 15V directly to a battery. The battery charger is in the laptop, between the 15V supply and 10....
Justme's user avatar
  • 149k
0 votes
Accepted

What sort of connector is this (Gtech robotic lawnmower)?

What type is the white connector? The white connector is a TE Value-Lok The female housing's part number is TE 1586105. https://www.digikey.com/en/products/detail/te-connectivity-amp-connectors/...
Davide Andrea's user avatar
0 votes

Can I make my Battery Pack Much Efficient in my DIY Power Bank?

This is not a great idea. The additional circuitry will make the power bank more complicated and less efficient (as it also needs to be powered somehow). Add to this the inevitable energy losses in ...
Jonathan S.'s user avatar
  • 18.9k
0 votes

When a battery is your power source, what is ground?

The answers that say “ground” is arbitrary are correct. One thing to keep in mind is that all the stuff surrounding your circuit is connected to earth (the planet). So, say you have your circuit in a ...
user69795's user avatar
  • 1,610
0 votes

Do batteries have capacitance?

Unlike the above answers, I see the battery not as a capacitor, but as a constant voltage source in series with an internal resistance. The battery voltage does not change during one cycle of AC. ...
richard1941's user avatar
0 votes

What type of 18650 terminal is this?

These 'one-sided' concentric-terminal batteries do exist. I have a couple of devices that use them, all by different manufacturers. Sadly, I don't know how to order these specific 18650 batteries ...
dnl's user avatar
  • 1
0 votes

Do batteries have capacitance?

Both batteries and large electrolytics can be modeled fairly well as network of interconnected capacitors and resistors. An under-appreciated feature of axial capacitors is that they tend to behave ...
supercat's user avatar
  • 46.8k
3 votes

Do batteries have capacitance?

No, batteries do not really have capacitance, they can store and release charge with chemical reactions. But to an outside observer, there is not much difference between a battery and a very large ...
Justme's user avatar
  • 149k
1 vote

Do batteries have capacitance?

Even small batteries have huge capacitance. Remember that one amp-hour is 3600 amp-seconds. One coulomb is one amp-second. So very roughly for 1 volt drop 1 amp-hour is 3600F. Thus, your car battery ...
Autistic's user avatar
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23 votes
Accepted

Do batteries have capacitance?

The situation, particularly with lead acid batteries, is a little complicated. As the battery is charging the chemical reactions take time to penetrate through the depths of the plates. This results ...
RoyC's user avatar
  • 10k
8 votes

Do batteries have capacitance?

Just to answer the title: You normally can't model a battery as a single capacitor but you can think of the battery as a very large capacitance (from energy storage) because the voltage across both ...
Rohat Kılıç's user avatar
7 votes

Do batteries have capacitance?

I would have expected a ripple between the battery voltage and the charger output peak voltage. Say for example a 120Hz ripple between 13.5V and 14.5V. But I'm seeing a very flat DC voltage instead. ...
Andy aka's user avatar
  • 458k
0 votes

How to monitor voltage and charge status in USB battery pack

I use a 9v rechargeable battery through a circuit that delivers 5v wired to a usb plug. I have a voltage divider connected to the battery and tap off a voltage that is safe for my arduino to measure ...
Gordon's user avatar
  • 1
1 vote

Charge batteries in parallel, discharge in series

Yes, it's possible, but fraught with a few problems: Balancing is trickier While in series, one of the two batteries will be the first to be emptied; when its BMS shuts it down, the load will be ...
Davide Andrea's user avatar
0 votes

Vax Blade 4 BMS board issue (5 x 21700 cells Li-ion 18v battery)

a defective / blown component on the board which has oozed out its stuff Gosh no. There is no "stuff" inside those electronic components to ooze out. That's just flux from the soldering ...
Davide Andrea's user avatar
3 votes

If i know a battery's internal resistance, how accurately can I predict its maximum current?

Yes, that's more-or-less correct. It's the greatest current that could flow with just the battery and a resistor. Of course you could connect batteries in parallel (series won't increase the current ...
Spehro Pefhany's user avatar
1 vote

Will this Ebike powerbank circuit work?

It looks OK. Generally, there's not need for that ideal diode because generally the charger doesn't discharge the battery while off. The SoC meter based on bus voltage won't really tell you much ...
Davide Andrea's user avatar
2 votes
Accepted

How much current can I pull out of a battery

Ability to supply current from a battery is limited by internal impedance of the battery. The impedance value is dependent on manufacturing technology and physical battery size. The first-order ...
Ale..chenski's user avatar
  • 40.7k
0 votes

Measuring Discharge Rate of Li-ion cell

First, the Li-ion cell doesn't have a "discharge rate", so there is nothing to measure there. The load sets the current (at a given voltage), not the Li-ion cell. Second, while it's true ...
Davide Andrea's user avatar
0 votes

Can a 4.2V cell BMS function with 3.6V cell?

They're of different chemistry and their safe operating region are different. 4.2V batteries can either be NMC, LCO or LMO, while 3.6V one is LFP. More info on this you can find here - https://...
EarthLord's user avatar
  • 565
4 votes

Protection circuit for a 12 V Li-ion battery pack

No, there isn't. There is no way to protect a Li-ion battery with 2 or more cells in series without access to the inner connections between cells. That is because you cannot infer anything about the ...
Davide Andrea's user avatar

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