Battery protect and lithium battery

I just finished the wiring diagram and i have a few questions:

  1. Is it necessary to fuse the GND from the BP65?
  2. I use the BP65 out to power a relais and that relais will power the inverter. Is this good practice?
  3. The Inverter will make a floating IT net for 230V. So i don’t need a earth switch right?

If anyone off you has other remarks, I would love to hear them.

  1. If you use a BP65 a fuse is recommended in the negative wire per the manual.
  2. If you want to control the inverter to shut down before the BMS then the system shown will work. A BP65 is higher duty than required but I do not know of anything else. Inverters normally have capacitors on the DC input, so the inrush current can be high when the relay closes. Some BMSs will detect an overcurrent and shut down. This may be a problem.on start up.
  3. No comment.
  4. Please do not use the resettable breakers you have shown unless you use a good make such as BlueSea. A lot of these devices are cheap copies or fakes and have a very bad record of failing to work or overheating. Better to use a fuse and a quality isolation switch.

Hello @Robby …I would not use the battery protect module at all. The internal BMS will protect the battery and the complexity of the battery protect device is unnecessary. It is meant for batteries that require an external BMS.

Simply fuse the feed to the inverter and forget about the 200amp relay.

Kind regards