Batrium circuit breaker and PIP behaviour

If i would add a BMS like Batrium to a Powerwall of 18650s and i use a circuit breaker ,controlled by batrium, for breaking in terms of cell over- or undervoltage, would a pip work when it disconnects the battery?

Most of them doesn't support batteryless operation. What happens then? No more power on the AC out? Or does it transfer AC in to AC out in this case?

Also without an automatic trip breaker i do not have protection for over- or undervoltage? Just balancing and Monitoring?

All off-grid versions will shut down since they have their primary source to power the inverter from the battery. You need a hybrid version or the PIP version that is semi hybrid and can run from grid. Note that the under and over voltage protection on the BMS is the LAST resort of protection. You should have built in over and under voltage in the charger/inverter that is triggered long before! Dont forget that the charger/inverter do pull some power in idle mode so you need to have a reserver in the battery bank

If you want to switch the load back to grid when it happens just install a proper ATS (Automatic transfer switch)

With that said you should only trip that breaker in a massive failure event. How often do you plan that to happen? Its the same as when you have normal fuses. You have no backup for those right?

Just in case one parallel would go up to fast in voltage we need a parachute i tought. For sure we don't want to get that happen but if it does i need to know whats going on By the way how much charging current is ok for normal use? If i have 100p pack for example is 50 Amps ok. Or can i go to 100 Amps. Just in case the good cells will take more current.

If you tested the cells at 1A then 1A is your max. If max test current on both charge and discharge was 0.5A then you should limit at that.
Doing that you know where the limit is.

I test everything at 1A. Don't the good cells take more charging current? Or do you think its ok because they are good?

Maniac_Powerwall said:

Don't the good cells take more charging current?

Click to expand...

No, just the same current, for a longer period of time.

The cells with lower IR will take more hit when you max it out yes.