thefutureisbright
New Member
I have a question and then the real question....
I bought a JBD - JK-B2A25S-60P BMS for my battery bank (300 A-H, 48v 16s1p) and I have struggled to select the right relay for it. I've come down to these general guidelines for selecting a relay contact for operating the system. I would like feedback if I'm missing anything on the list:
So overall the list of things you want in a relay is:
So question #2. On the JK-B2A25S-60P BMS it has 3 spots for relays listed in the manual (see diagram).
What is the voltage of the relay switch circuits O2, O1, DC+, DC-, C+ and C- and what is the maximum amps they can supply (some relays need up to 4 amps on a 12v supply but I don't know if my BMS can supply that)? JBD documentation is kinda sparse. So I'm reaching out to y'all.
So
I bought a JBD - JK-B2A25S-60P BMS for my battery bank (300 A-H, 48v 16s1p) and I have struggled to select the right relay for it. I've come down to these general guidelines for selecting a relay contact for operating the system. I would like feedback if I'm missing anything on the list:
So overall the list of things you want in a relay is:
- Adequate continuous amperage rating for your continuous use purpose
- Adequate surge amperage allowance
- Adequate amperage for the max current of your wire/fuse
- Dual coil ( or low maintenance wattage <5 watts)
- Adequate voltage rating for your battery… 60v rating for 48v battery
- Low enough trigger in rush current that your battery management system can handle it some are 4 amps for a 12v BMS) Note: May need to have a separate relay to switch on trigger…a relay to a relay.
- EMF protection for trigger release voltage spikes to protect your BMS components (called coil suppression)
- The relay needs to be rated for both polarities to handle by directional current (some only handle one direction)
So question #2. On the JK-B2A25S-60P BMS it has 3 spots for relays listed in the manual (see diagram).
What is the voltage of the relay switch circuits O2, O1, DC+, DC-, C+ and C- and what is the maximum amps they can supply (some relays need up to 4 amps on a 12v supply but I don't know if my BMS can supply that)? JBD documentation is kinda sparse. So I'm reaching out to y'all.
So
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