Pls help me with system design

moonlitsouls

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Test continuity not voltage.
Find the little speaker symbol in the ohm range.
The leads should make a tone when you short them
I did hear the sound when I touched the leads together but no sound when entering into the plugs of n and g on either the inverter or the extension cord
 

John Frum

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Regarding the inverter, I watched a video today where this guy on YouTube walked through several different scenarios on how to wire an inverter, and the different types of inverters and how they integrate into the RV. At 8:24 you can see him describe “a basic inverter” I believe that fits exactly what my system is. When you say you don’t want to integrate the inverter into the AC panel, I thought we weren’t doing that anyway because I just have a basic inverter that can’t be hardwired?

Cools sounds like its not a problem then.
We will just skip integrating the inverter into the ac domain.
 

moonlitsouls

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Cools sounds like its not a problem then.
We will just skip integrating the inverter into the ac domain.
Ya I’ll just keep running it off the battery directly and just use the extension cord , thanks again for your time
 

moonlitsouls

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Here is a textual representation of your system.
Don't worry if you don't understand it.
I will draw something using draw.io tomorrow night.
Code:
dc {
    * 12 volt system floating
    core {
        pos { * littlefuse fhz 7 with fuses over the busbar
            004|150|<->150A_breaker<->battery.pos
            004|150|<-scc.output.pos
            004|150|<-dc2dc_charger.output.pos
            004|150|->inverter.pos
            004|075|->dc_distribution.bat.pos
            016|001|->shunt.pos
        }
        neg { * 4 position busbar
            004|UUU|<->shunt.neg.aux
            004|UUU|->scc.output.neg
            004|UUU|->dc2dc_charger.output.neg
            004|UUU|<-inverter.neg
            004|UUU|<-dc_distribution.bat.neg
        }
    }
    shunt {
        pos
        neg {
            aux
            bat<->bms<->battery.neg
        }
    }
    dc_distribution {
        * ac/dc distro 10 feet round trip to core
        * 75 amp fuse because the dc distribution center backplane is part of the circuit.
        bat {
            pos
            neg
        }
        converter { * we leave the converter dc connected to the distribution panel
            pos<-pos
            neg->neg
        }
     
    }
    dc2dc_charger {
        * 60 amp dc2dc charger
        * should be using 2 awg but that big honkin alternator can compensate for the voltage drop
        output {
            pos
            neg
        }
        input {
            pos<-alternator.pos
            neg->starter_battery.neg
        }
    }
    inverter { * 1200w watt inverter
        pos
        neg
        eg
    }
    scc { * scc 100/50A
        output {
            pos
            neg
        }
        input {
            pos<-dp_breaker<-panels
            neg->dp_breaker->panels
        }
    }
}
* make sure the inverter bonds N and G
* make sure there is 120V between H and N
* make sure there is 120V between H and G
* make sure there is 0V between N and G

* the shore power goes is going to disabled
* the converter and its fuse are in parralel with the generator
* there is probably a time delay for the generator relay
ac { * 14 awg wire to inverter and the converter
                                 |->15A_fuse->converter
                              /<-|<-generator
    |<-30A_master_breaker<-ats/<-inverter
    |->[branch_breakers]->[branch_circuits]
}
Thanks a lot man, deff curious to see this in English 😅
 

Zwy

Photon Sorcerer
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Jan 3, 2021
Messages
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Location
Timbuktu
hi joey , yes im very confused about this and ive watched a lot of videos. the thing is everyone is adding a multiplus and rerouted the ac/dc loads through the multi plus , im keeping my stock ac / dc panel so i need a little help on this last piece. in other words - i dotn know what do wo with the panel ,

all im trying to do is increase solar capacity , add the dc-dc charger , fuse the system properly , and clean up the install a bit , it was thrown together by the rv dealer who sold the rv to the first owner
This is how I did mine, I removed all the 12v circuits from the ac to dc converter and installed a separate fuse panel. There were only 4 fuses in the converter and this split the loads more. Behind the fuse panel is a 24v to 12v buck converter as my battery bank is 24v. I did see your photo of your current dc distribution panel in the converter, you could remove and tape off the current positive cable that supplies power from the ac to dc converter and install a cable to your solar system.

The switch above the fuse panel is to power off the ac to dc converter. I use the ac to dc converter to power the power jacks only, that is all it is used for.

In your diagram, I don't see a transfer switch. You will need one, even if you don't think you will ever hookup to shore power, just to be safe and prevent a loop.
 

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moonlitsouls

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Messages
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Here is rev-001 of your drawing
Morning Joey thank you again for the help I really appreciate it. The only thing , it’s going to be a bitch to order that 7 terminal bus bar , i can buy everything else I’m missing on Amazon but we need to get the connection points on each busbar to 4 so I can utilize the 250a busbars I have

I imagine I can move the 1amp line for the battery monitor to the batteries positive terminal ?

Can we move something else? Sorry I didn’t realize it would be hard to find the bigger busbar on Amazon, I don’t like ordering from anyone else it takes a week to arrive and im trying to install Monday or Tuesday
 

John Frum

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Messages
14,037
Morning Joey thank you again for the help I really appreciate it. The only thing , it’s going to be a bitch to order that 7 terminal bus bar , i can buy everything else I’m missing on Amazon but we need to get the connection points on each busbar to 4 so I can utilize the 250a busbars I have

I imagine I can move the 1amp line for the battery monitor to the batteries positive terminal ?

Can we move something else? Sorry I didn’t realize it would be hard to find the bigger busbar on Amazon, I don’t like ordering from anyone else it takes a week to arrive and im trying to install Monday or Tuesday
I doubt you will find anything even roughly equivalent on amazon.
Waytek is a reputable outfit.
 

John Frum

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What about combining one other wire with another to share a post

I already have a 4 post busbar
If you must...
Put the inverter and the battery on the same lug.
Battery on the bottom and inverter on the top.
Both wires must be fused independently.
 

John Frum

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Messages
14,037
Since you are going with un-fused busbars put an anl fuse as close to the positive battery terminal as possible and take the shunt feed off the system side of that fuse.

The inverter and all the other main circuits are fused as close to the busbar as possible.
The dc2dc charger circuit should be fused as close as possible to the starter battery.
 
Last edited:

moonlitsouls

Solar Enthusiast
Joined
Jan 4, 2021
Messages
424
Since you are going with un-fused busbars put an anl fuse as close to the positive battery terminal as possible and take the shunt feed off the system side of that fuse.
this part confused me a bit , the rest of what you said made sense
 
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