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Hello

compulsive problem ! I have build a circuit and now I want to try it. I removed some parts, I added resistor after the supply so that it can't claim for shortcircuit , removed all node in case has a problem. Made ton of modification to make it totally fool proof, still same problem. After one day working on it, I try the forum !

I found the problem with this software is it doen't gaves feedback for the errors it finds. Here I just had something like V(un15) N/A and now deliver totally no output at all.

what did mean "V(un15) N/A" ??? a mystery for me. I haven't found a guide to explain the error codes

I even don't know circuitLab rules. Apparently it's difficult to have the circuit accepted by simulation tool. But the problem We don't know the rules, what makes the stuff to abort..

I've read a few thing about earthing...

What to do ? remove all components and try to put them back on by one ?

if wires left unconnected will bother CircuitLab or not ?

Thanks for everyone's help !

Removed all components and put some earth so unconnected elements will have gnd potential.

Still refused !!

Put again I few components, still the same

I like your methodical step-by-step approach to finding problems. In this case I think you can take a slightly bigger step and look at a fragment of the main circuit. The (standalone) fragment I suggest is in this circuit:

https://www.circuitlab.com/circuit/7yf6n9757554/fragment01/

I have included some hints for further investigation...

Hope this helps for successful bug chasing - bonne chance!

Postscript. If you are on the way to making a DC to DC boost converter, you might be interested in this circuit from the CL archive:- "Conversor Boost" https://www.circuitlab.com/editor/#?id=82y69g

Thank you very much EF82 ! I currently find more problems using CircuitLab..

https://www.circuitlab.com/circuit/ejcfk8r55pb9/test2/

I can reverse supply V7, amps will still flow using dc simulate. ! it's impossible.... and in the other hand, apparently I just found DC sweep looks to behave normally ?

no it's not a converter, it's only a battery manager. I could do it so much easier simply using relays...