Determining fuse size and inverter considerations

I have been reviewing Will's setup here:


In the section on fuses, he mentions that in order to determine the fuse size coming from the battery to the inverter, you simply multiply the maximum current the inverter is rated for by 1.25. Why 1.25? I ask because if the fuse is too big, could it result in the inverter getting damaged?

I have a Renogy 2000W inverter. By his calculations, I divide 2000 by 12 to get the amperage, which comes to 167. I would then multiply 167 x 1.25 which comes to 208.75. So should I get a fuse slightly larger, let's say one rated for 225? I realize the amperage information also informs me regarding the gauge size for the wires, but my concern here is protecting the inverter. On the Renogy website, it does state that they have overvoltage protection, but I'm still not clear on the 1.25 factor comes in.

Thanks!

Fuses/breakers exist to protect wires not equipment.

1.25X results from the national electric code and because running fuses and breakers AT their rated current for extended periods will eventually cause them to blow/trip.

2000W/12V/85% effiency = 196A
Thus you need to use wires rated for 196A and a 250A fuse/breaker.

If you can't get the exact size fuse/breaker you need, get the next higher one available.

Inverter overvoltage protection means the inverter will shutdown if the voltage exceeds the protection value. This is typically around 16V.

Fuses/breakers exist to protect wires not equipment.

1.25X results from the national electric code and because running fuses and breakers AT their rated current for extended periods will eventually cause them to blow/trip.

2000W/12V/85% effiency = 196A
Thus you need to use wires rated for 196A and a 250A fuse/breaker.

If you can't get the exact size fuse/breaker you need, get the next higher one available.

Inverter overvoltage protection means the inverter will shutdown if the voltage exceeds the protection value. This is typically around 16V.

Click to expand...

Wow, this is super helpful...thank you! This definitely puts this in perspective and answers a lot of questions.