Oversize a BMS ?

[West Coast Canuck]

I will have a 16s 48 volt 280amp battery pack, this means I think I need a 300amp BMS, can I use a 600amp bms or must it be closer to the battery pack size. If it is OK to use any amp over min what other than cost are the cons

 

[MisterSandals]

The BMS amp rating is for the expected charge and/or load currents passing thru it. It is not related to the capacity (amp hours) of the battery(s).

 

[West Coast Canuck]

Thank you, so what do I need to know to calculate the size of my bms and inverter, I would like to have a battery back up with future solar panels.

 

[MisterSandals]

Perform an energy audit to determine your power needs. This will give more of a daily power use figure. You need to determine how much power you will need to handle at any time: running microwave, hair dryer, ... at the same time. It adds up quickly.

Energy Audit and System Sizing Spreadsheet

EDIT: The Audit & Sizing spreadsheet can now be found in the "Resource" section of the fourm: https://diysolarforum.com/resources/system-energy-audit-and-sizing-spread-sheet.12/ In order to avoid any confusion, I will change the links in this thread to point to the resource rather than the...

diysolarforum.com

Then for charging side, estimate how many amps you intend to charge the batteries.

 

[West Coast Canuck]

Thank you so much mister Sandals, now I have a direction and will do the audit and continue from there

 

[MisterSandals]

will do the audit and continue from there

Great! We will see you if/when you have more questions or have a killer system to show off!