Will I blow up my system?

Pete in Puerto Rico said:

Thank you for looking at my uestion, When adding a new battery bank to my busbar, do I need to shut down the EG4 6000xp unit before adding it? I understand I will need to adjust the new total amp hours. I am using Chins 12.8v LIFePO4 batteries to make a 48v battery in a series.. Thank you

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Daddy Tanuki said:

First quesiton... is your system 48 volts? then honest answer:

No you will not, just make sure they are close to the same charge level. if the new battery is fully charged or close to it, make sure you old batteries are as close to full charge as possible. you do not want the new bank suddenly jump starting your old bank... its a good way to fry BMS's.

if its not 48 volts then this could be fun to watch. (remember tthe rest of us have no clue what you have if you do not tell us, as badly as I wish it, none of us are all seeing gods.... (could you imagine that ability as a teenager? Your HS crush's ta ta's open to your view 24-7! yes.... Thank you Sweet Baby Jesus!

that being said... eventually we all blow something up... just get over the fear of it and pretend like its Bingo.

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DIYrich said:

You don't "need" to shut down for the Inverter's sake. However, you might want to shut down for your sake. A lot of amps are at the bus bar if you haven't turned everything off.

My inverter can pass through PV and Grid, and leave the battery alone. So, I can turn off the Battery Breaker and keep power flowing to the house. Don't know if that is possible with the 6000xp.

My process is:
1) Charge up current (old) battery to full.
2) Turn off battery breaker of the Inverter
3) Turn off battery.
4) Attach new battery to busbar
5) Turn on battery breaker
6) Turn on new battery (it has a pre-charge circuit, but usually doesn't need it).
7) Charge new battery to full (added benefit that if you have done anything wrong, it won't charge, and you haven't turned on the old battery yet).
8) Turn on old battery
9) draw down on battery a little
10) charge both batteries to full

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