@Craig and others.
I am just working on the documentation related to the Delay Board for Chargery BMS' and it's application / configuration.
As part of that, I have ordered a few components in order to accommodate a pre-charge circuit using the "small relay" port on the delay board.
The "Small Relay" only has to be an automotive 4 pin ISO mini relay that is N.O. (Normally Open) to trigger the pre-charge.
Items required: Fuse, Fuse Holder, Resistor (200 Ohm) per delay board (note, I am running with 24VDC)
- For the Resistors I kept with 200 OHM as KISS is to be applied.
- Quick Resistor info:
--- 12V 200 Ohm = 1 Watt / 60ma
--- 24V 200 Ohm = 5Watt / 120ma
--- 48V 200 Ohm = 15Watt / 240ma
Parts from Digi-key (They ship worldwide) (this is what I ordered for my application)
--
TE Connectivity Passive Product 200 Ohms ±5% 10W Wirewound Chassis Mount Resistor
--
Little Fuse 0977010.MXP (10A 500V AC 450V DC Fuse Cartridge, Ceramic Holder 5mm x 20mm)
--
Schurter Inc. FUSE BLOCK CART 600V 10A CHASSIS Fuse Block 10A 600V 1 Circuit Cartridge Chassis Mount
IF you need to figure out resistor info & other valuable info:
Resistor Power Rating Calculator
www.amplifiedparts.com
Hope it helps,
Steve
PS: Quick reference on the "Small Relays" for those who need a helping hand with them.
Read our guide to relays found in vehicle electrical systems. How they work, why they're used and some example applications
www.12voltplanet.co.uk