I have an issue where it appears that the inrush current of a Orion 24/12-70 high power DC-DC converter is tripping my BatteryProtect.
I have a 24V system with a BatteryProtect on the DC load bus. Between the battery and the DC loads is the 1) the main Class T fuse, followed by 2) a Blue Sea 80A 285 series DC breaker for DC loads, then 3) the BatteryProtect, 4) a Blue Sea 24V breaker panel, then 5) the Orion DC-DC converter for 12V loads. It feeds lights, fan, water pump, tank heaters, and other 12V DC loads. The remote switch on the BatteryProtect is controlled by my BMS.
The problem is that when powering up–whether via the remote power switch or via turning on the 80A DC breaker–the 12V lights briefly flash and then the BatteryProtect trips and interrupts the DC power. It will then repeat this every few seconds. If I first turn off the breaker in the 24V panel that feeds the DC-DC converter, power up the BatteryProtect, and then turn on the panel breaker, everything powers up OK. This is a crude workaround and is OK for powering up the system, but this is not acceptable for BMS control. If the battery SOC gets low, the BMS will turn off the BP via the remote switch. Once the battery is charged sufficiently, the BMS Allow To Discharge will turn on the BP remote switch and the system should power up. However, it stays in this cycle of inrush current tripping the BatteryProtect.
I had this issue with my first BP 100, it developed after some time. I replaced it with another new BP 100 and that has been working without these nuisance trips. But I thought it would be a good idea to go with the bigger BatteryProtect 220. So I swapped out the existing BP-100 (the second one, which had been working fine) for a BP 200. Lo and behold, it trips on the inrush current. I swapped it back out for the second BP-100 and that still works (for now).
Is this expected behavior for a BP with an Orion high power DC-DC converter as a load? If so, then it is not useful to me. If not, then what can I do to mitigate this without having to manually sequence breakers? That defeats the purpose of a BMS remote switch.