How big of a circuit breaker should a solar container battery cabinet use

How to choose the right circuit breaker for a solar PV system?

Choosing the right circuit breaker for a solar PV system is critical. A circuit breaker protects the system from overloads and short circuits, preventing fires and damage to panels, inverters, and wiring. Using a breaker that is too small can cause it to trip constantly; one that is too large won’t trip when needed, risking danger.

What size breaker for a 100W solar panel?

You didn't share that but let's assume it is this 100W Rich Solar panel. Then you want to size your breakers off of Isc = short circuit current = 5.93A. Again, if 2 of them are in parallel, that would be 2*5.93A = 11.86A, then 1.2x gives 14.2A. So actually a 15A breaker would be more appropriate.

How do I choose a fuses or circuit breaker for a solar panel?

When selecting fuses or circuit breakers, you need to check the rated short circuit current (Isc) value for the panel you are using. The Isc is the maximum current that the solar panel can produce under any circumstances, and it determines the size of a fuse or circuit breaker for a solar panel as described in the formula below:

Do solar panels need a breaker?

Solar panels are grouped into strings, and each string needs a breaker to protect the wiring between the panels and the inverter. The inverter, which converts DC power from the panels to AC power for home use, requires breakers on both its input (DC) and output (AC) sides.