I got fed up furtling around and resolved to use the following solution:
(nb: I am configured for Common Port - charge/discharge on the same DC Line.)
Bought 8
TE Connectivity Kilovac EV200AAANA Contactor 500A 12~24VDC contactors for all my packs (wiped out the vendors stock)
SPECS DOC LINK: https://www.te.com/commerce/Documen...200_Ser_Contactors&DocType=CS&DocLang=English
Bought a batch of Keyes 2R1B 2-Channel Relay Modules for Arduino & Raspberry Pi - 12V (Opto Coupler)
(there are many brands of identical boards)
Product link: https://www.buyapi.ca/product/2-channel-relay-module-for-arduino-raspberry-pi-12v-keyes/
Will use the board to drive ONE relay for Charge/Discharge. These boards can handle 12VDC. If looking for such, ensure that it is the 12V version for 12V relays, by default these are offered as 5V so beware of the differences. (This solution came from a member in the SSR-Testing thread)
View attachment 13060
AN ALTERNATIVE to the TE Contactors:
I wanted to get some of these to test, I bought two incorrect ones (uni-directional / polarized) and waiting to get info there was also some miscommunication & delays which made me seek the alternative above. I would still go ahead and try these but I am out of experimenting time. ATTACHED is the DHV200 Energy Saver data sheet from Dongya -
these are roughly $30 USD each plus S&H +Duties/Taxes.
Their Website:
https://en.cndongya.com/high-voltage-dc-contactor/
Contact by EMail to get quote / PayPal invoice.
The DHV200AAANH is non-polarized, bi-directional, energy saver type:
V stands for non-polarized
200 stands for rated current 200A
The first A: main contact normally open (stud type)
The second A: coil voltage 9V-36V
The third A stands for coil wire length is 390mm
N stands for not with coil terminal connector
H stands for install method is Horizontal