Electronic Parts Store : 2 Capacitors, 2 Resistors & more

Saturday, I finally went to an electronics dealer in the southern close suburb of Paris and found some resistors and capacitors of different values to test in my search of a decent Economizer for my Tyco Kilovac EV200A1ANA Contactor

As I was there I also got some wide Heat Shrink, and a Solder sucker

82 and 68 Ohms 10W resistors

3300uF and 2200uF 35V capacitors

And back home, I tried every combination of resistor and capacitor and finally found out that the 82Ohms resistor along with the 4700uF capacitor was OK, especially at - low - 25V starting voltage - when the pack is empty -

and comsumption is quite low, around 0,3A at 25V, which should be around 8W

So these are the components I will mount on the ESS Control Board along with / next to the EV200A1ANA contactor, as soon as I find time for this  

Economizer test under 24V for Tyco Kilovac EV200A1ANA

Last night I continued my resistor value testing this time with 2 12V AGM batteries wired in series to get a voltage similar to what I have on my ESS battery pack: more or less 26V (open circuit)



Trying different lengths of resistive wire, I test oif the contactor closes and stay closed, if it does not, I simply put less resistive length, meaning less resistance
Here I got a good result and the current going through the circuit is only 0.3A => power used = 0.3 x 26 = 7.8W

I then measure with an ohm meter the resistance value and will try find one approching this figure, here 86 Ohm
Of course, as the resistor uses current, the voltage drops, and the relay / contactor will eventually open, so I have to lower this value; Finally I decided to get a resistor of 75 Ohm after several tests