Hi!
Long story short, my BMS did not have precharge functionality as my seller told me, so i have to design my own.
I have a fairly large Victron Quattro 48 V 10000 VA and therefore absolutely need a precharge. Yes manual precharge would be possible, but in the event that the BMS shut down the contactors and restart automatically or somebody forget to turn on the precharge i do not want to destroy my contactors
I am designing a pretty simple delay circuit for the contactor to allow the precharge to charge the input capacitor though a power resistor before engaging the main contactor.
However it is much simpler for me to just have the precharge switch not turn off when the main contactor go active. Then i can just wire the precharge switch directly to the contactor output of the BMS and the contactor though a delay circuit. Having the precharge turn off when the main contactor go on, adds complexity to the design.
I do not see any immediate reason why the precharge cannot be active while the main contactor is active. I mean, it would just be like 100 Ohm in parallel to the contactor when it is on. It will turn off at the same time as the contactor.
Any opinions ? Are there any reason for the precharge having to be turned off when the main contactor is on ?
Long story short, my BMS did not have precharge functionality as my seller told me, so i have to design my own.
I have a fairly large Victron Quattro 48 V 10000 VA and therefore absolutely need a precharge. Yes manual precharge would be possible, but in the event that the BMS shut down the contactors and restart automatically or somebody forget to turn on the precharge i do not want to destroy my contactors
I am designing a pretty simple delay circuit for the contactor to allow the precharge to charge the input capacitor though a power resistor before engaging the main contactor.
However it is much simpler for me to just have the precharge switch not turn off when the main contactor go active. Then i can just wire the precharge switch directly to the contactor output of the BMS and the contactor though a delay circuit. Having the precharge turn off when the main contactor go on, adds complexity to the design.
I do not see any immediate reason why the precharge cannot be active while the main contactor is active. I mean, it would just be like 100 Ohm in parallel to the contactor when it is on. It will turn off at the same time as the contactor.
Any opinions ? Are there any reason for the precharge having to be turned off when the main contactor is on ?