Guru
Joined: 02/02/2017
Location: AustraliaPosts: 1461
| Posted: 05:48am 18 Feb 2024 |
hi Naseerak
in the builds of inverters I do (two for my home)
I see no need for short circuit protection since I have
contact breakers on the output AND DC contact breakers on the DC input.
The HY4008 and others of that family have prodigious capacity for
current conduction without failure if it's PWM.
If it's DC then they are weak as you could ever imagine.
This is by design.
So, no need for short (defined as 0.01 second) very high currents since the FETs
will shrug it off and ask for more.
Long period shorts will be taken care of by functioning DC breakers and or AC output
breakers.
But here in Australia we tend to load our home built inverters with sensible
loads and take care NOT TO SHORT THE OUTPUTS.
The highest loads I've seen in my home is when the dishwasher is pulling 10 Amps
and then we put a 10 amp kettle on too. This means about 20 Amps of 240W or about 5kW
This is not a short.
But then a fridge decides it's time to switch on...
Things still do not blow up.
Why?
make sure the choke can handle these large currents and still be a choke and not
a short piece of copper wire.
put a 65 or 100 Amp breaker on the DC supply
put a 150 Amp fuse before that.
this is all assuming it's a 50V battery.
with these sorts of loads you would be insane to choose 12V battery.
really, really insane.