Hi everyone.
Strange issue I'm having, I have a 1200AH 24v LiFePo4 battery bank connected to four Victron Miltiplus 24/3000/70 charger/inverters. I'm using a REC BMS and a TE Kilovac 500a contactor.
After charging the bank at around 250a for 3.5hrs I discovered the contactor would not close after opening the circuit. I could hear the actuator inside but no current passed across the terminals. I called my vendor and they RMAed me another. This time, after a couple hours the opposite happened, the contactor was now stuck closed even without power.
I discovered on both contactors that if I 'worked' them on the bench rapidly with +24vdc they would free up and work again. It looks like both got stuck from what I can only assume was overheating.
I am CERTAIN I did not exceed 250A-280A and these are rated for 500A.
Any idea what's going on here? Are there any phenomenons where multiple chargers being combined can create an electrical situation that results in heat generation or some sort of harmonics? These terms may not be applied correctly, I'm just at a loss as to why this has happened twice in a row. Doesn't seem possible to be two faulty units, it must be me, but what?
Strange issue I'm having, I have a 1200AH 24v LiFePo4 battery bank connected to four Victron Miltiplus 24/3000/70 charger/inverters. I'm using a REC BMS and a TE Kilovac 500a contactor.
After charging the bank at around 250a for 3.5hrs I discovered the contactor would not close after opening the circuit. I could hear the actuator inside but no current passed across the terminals. I called my vendor and they RMAed me another. This time, after a couple hours the opposite happened, the contactor was now stuck closed even without power.
I discovered on both contactors that if I 'worked' them on the bench rapidly with +24vdc they would free up and work again. It looks like both got stuck from what I can only assume was overheating.
I am CERTAIN I did not exceed 250A-280A and these are rated for 500A.
Any idea what's going on here? Are there any phenomenons where multiple chargers being combined can create an electrical situation that results in heat generation or some sort of harmonics? These terms may not be applied correctly, I'm just at a loss as to why this has happened twice in a row. Doesn't seem possible to be two faulty units, it must be me, but what?