5 votes

Can you use a 12V lead acid battery to switch a contactor?

That resistance you quote is for the auxiliary contacts, not the coil. The coil takes a peak current of 3.8A (ie a 4 ohm load) and features a built in economizer which limits the current draw after ...
user avatar
  • 487
4 votes

How to get multiple voltages from a single battery?

The easiest way for a hobbyist to do this is to purchase one or more buck regulator modules that use a switchmode regulator chip to reduce the voltage without much loss. Then use the 12V for the motor ...
user avatar
2 votes

How to get multiple voltages from a single battery?

You can use relatively cheap components. So-called voltage regulators are quite ubiquitous. They come in two main types. Assuming that your microcontroller does not draw much current you can use a ...
user avatar
  • 6,406
1 vote

How to get multiple voltages from a single battery?

Getting a voltage lower than the battery is simpler than a voltage greater than the battery. A voltage divider will give you a lower voltage, but the voltage will be sensitive to the load. A voltage ...
user avatar
1 vote

Should I use a DC-DC converter or an LDO?

It looks like LiPo batteries stay above 3.3V in normal charge levels, and drop to 3.0V when they're below ~80% capacity. Image source: https://learn.adafruit.com/li-ion-and-lipoly-batteries/voltages ...
user avatar
  • 11
1 vote

Charge a 12V 90Ah led acid battery using 12V 20A SMPS

Your question: If I use the above SMPS will that SMPS reduce the current accordingly or give the total 20A current? Short Answer: Most probably it will not provide an adequate current, triggering ...
user avatar
  • 526
1 vote

Charge a 12V 90Ah led acid battery using 12V 20A SMPS

No, because a switch mode power supply is not a battery charger. Power supply can also be damaged when connected to another voltage source, the battery. You need a battery charger to charge batteries. ...
user avatar
  • 87.1k
1 vote

Circuit to charge three lead acid batteries in parallel and discharge them in series

I tried this, but finally I decided it's not worth the effort. This schematic was my draft for the test: There may be errors in the schematic, don't trust it! Danger to come! To your question: I used ...
user avatar
  • 236

Only top scored, non community-wiki answers of a minimum length are eligible