I made a tool for modelling marine electronics
Posted by mrmattsson@reddit | sailing | View on Reddit | 11 comments
I hope it’s okay to share this here since it’s completely free to use.
I built a tool for myself, and anyone else who might find it useful, for modelling electrical systems in boats and vans.
It can help with things like cable sizing, fuse recommendations, and simulating different scenarios to see how batteries behave under different loads and charging conditions.
It’s still very new, so there are probably bugs and things I’ve missed. Please use your own judgement before relying on it too heavily.
I’d love feedback, ideas, or bug reports if anyone decides to try it out!

ohthetrees@reddit
I played with it for 5 minutes and I think it is very neat. I might have used it when I was designing the electrical system on my boat. Has some rough edges, but also serious potential.
mrmattsson@reddit (OP)
Thanks! If you don’t mind I’d really appreciate it if you gave feedback if you find something specific that is wrong or feels odd!
ohthetrees@reddit
I'm probably not going to use it much because my boat is sorted, but it seemed like when multiple devices were in parallel (I have 4 mppts) the wires get crossed up with eachother in ways that are hard to control. But I like where you are going with it.
mrmattsson@reddit (OP)
Thanks. Yeah I’ve done like 20 iterations on the wire routing. It’s improving but I haven’t quite nailed it yet. It gets really complex, especially with many components.
Did you try to use busbars/fuse boxes/jumpers? It usually helps a lot to make things tidy
Thanks for the feedback
Successful_Cod_8904@reddit
Ok, thanks need to start the Mac for it. Will try tomorrow morning. Just doing a rewire/ build for small boat.
mrmattsson@reddit (OP)
Let me know how it goes!
Slow_Attitude_5119@reddit
This is really cool, I would love for it to acommodate for different voltage levels! E.g. a 48v battery and epropulsion system, 48v windlass, then stepping down to 12v for house loads (All this is currently possible but the system thinks its all 12v)
mrmattsson@reddit (OP)
Cool! Never thought about that scenario but I’ll read up on how that works. Thanks for sharing
JustEricDerby@reddit
This is really neat! Thank you for sharing
Slight-Conference680@reddit
Does it work for 24 or 48 vdc?. As well as the AC side of the system?
mrmattsson@reddit (OP)
Primarily 12V, but it will understand if you put e.g. solars in series the voltage will increase. It also has inverters but the DC side of the system is what I really support.
Don’t have any AC myself so I don’t know much about how that works or what to think about. With that said, please let me know if it’s something specific that you lack and I’ll see if I can implement it!