/diy/ - Do It Yourself

>>2499262
you got it

>>1526943
It's a fucking conjugate you idiot.

>>1516083
You learn this table upside front and arse side backwards.

>>1516089
You need to know your devices current consumption under maximum load and how long you would like it to run between charges. You then plug that into C = xT, where C is amp hours, x is device draw, and T is time in hours.

C = 400mA x 12 = 4.8Ah required to run for 12 hours.

There's also shit like discharge depth ( most batteries don't like going below 20% capacity) and discharge rate (most batteries don't like having massive load all the time) to consider, see https://www.powerstream.com/battery-capacity-calculations.htm, come visit us in /ohm/ if you need help.

>>1507053
They are, thank thank you anon.

>>1507059
Best to use a resistor to drop the voltage. Use R=V/I to determine the value required, then use P=IxV to determine what wattage resistor you need so it doesn't smoke.

I am an electrician, ask me anything

>>1205371

/ohm/ - electronics thread