Understanding PV Solar Circuit Breakers - DC vs. AC - why they are different

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What is the difference in behavior between DC and AC? Why are DC and AC breakers different, and are they interchangeable? These and other questions will be addressed in this 10 minute video about circuit breakers. As a DIY solar power enthusiast, it is helpful to understand basic principles of electricity and circuit breaker operation.
DC does not behave the same as AC, and therefore DC circuit breakers are different from their AC counterparts. In fact it is not recommended to use an AC breaker for DC. Technically, a DC breaker can handle AC, but I don't recommend swapping them at all.
Plotting AC and DC on paper helps understand why they are so different and have different circuit breaker requirements. I will explain why AC is easier to interrupt than DC, and why an AC breaker is not suitable for interrupting DC.
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13 июн 2024

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Комментарии : 10

@JR-xw5dk Месяц назад

I want to thank you for the videos you make. Heating and cooking direct from solar could be life savers for many, but not many watch your videos. The Oscilloscope that you had discount codes for I was able to get it for $45 and I would not have gotten it without your video. I am on a fixed income and the low price allowed me to get it. Again thank you for sharing your knowledge.

@solarpoweredge Месяц назад

@JR-xw5dk Hi, you are most welcome, thanks a lot for your kind feedback. I do wish more people could watch these videos. PS fantastic deal on the scope, I think it will serve well. Thanks for watching commenting and supporting the channel!

@57monoshock Месяц назад

Thank you, I relate this back to welders that have AC or DC to weld with. Your expiation make complete since to me.

@solarpoweredge Месяц назад

@57monoshock Welcome!!

@davesigz Месяц назад

Thanks. Beginner here. Always wondered about AC versus DC breakers

@solarpoweredge Месяц назад

@davesigz Welcome! thanks a lot for watching and commenting :)

@solaroweder3707 16 дней назад

Thank you for your thoughts. Although I think it is correct that the difference between AC and DC breakers is tge arc suppression, it does not seem correct to me to compare a DCs tendency to arc to a water hammer. The water hammer suddenly increases water pressure far beyond the static pressure by means of inertia. In case of electricity the moving mass and the electrons speed is too low to cause such an effect in everyday application. I think. DC does create arcs because the voltage that creates the arc in the first place, remains constant and keeps feeding the arc. In AC - as you stated - the voltage drops to zero 50 or 60 times a second thus interuptimg the arc. By the time the voltage builds up again the breaker should have physically opened up a gap that is to wide for another arc to form.

@solarpoweredge 16 дней назад

@solaroweder3707 It's not technically correct to compare electricity to water, but I do it anyway as it's helped me a lot with thinking through this stuff. Funny enough, I don't believe half the "electrical models" taught are even correct to begin with, but definitely better than nothing. A user of Conventional Current here :)