Essential loads mcb rating
Hi Guys, I wonder if you can answer my nagging question.
Did you see Keith's video regarding pass through (the essential loads) https://youtu.be/AUoAB2Cbulg
His talking about folks burning out a relay as they are trying to pull too much energy; anyhow take a gander at the info at the right hand side. It states "The inverter has a maximum pass through current of no more than 50% of the inverter rating.", well this had me thinking.
Pass through, does this mean mains supply through the essential loads, or battery power in a blackout, or both?
Am I missing something?
I'm getting a 5.5kw inverter (ordered), so 50% of 5500w is 2700w÷230v=11.7x1.25(safety margin)=14.6 so a 15amp mcb is required, but the manual states a 32amp. I have no doubt your absolutely correct but for my peace of mind, I'd like to know why.
Also, I don't think I'll get anywhere close to using 15amps, so wouldn't it be prudent to fit a smaller mcb than a 35amp?
Thanks :)
I believe the rating is 50% _more_ than the rated inverter output, so MCB should be sized at 1.5x current, so 32A sounds about right from a 5.5K inverter.