grounding

[izban]

I currently have a towable travel trailer. It has a traditional 12v house battery setup. The negative is grounded to the frame of the trailer. I was planning on adding a 48v inverter/battery. Would I also ground the negative for that system to the same frame?

I will not be using a stepdown converter, but the previous installed converter(120v ac to 12v dc) to recharge the 12v house battery setup. This will be done with running wiring from the 30amp hookup to the inverter and back to the original electrical panel. The inverter would be the 48v victron multiplus 2 w/ 30amp charger. I had planned on adding a breaker post inverter, but not sure if it's needed. I will be adding a breaker in between the battery bank (48v) and the inverter. Would you recommend a breaker after the inverter and before the original panel, or would the original fuses there be appropriate?

Do you recommend grounding the solar panel frames to the chassis with 6g wire?

I've read through multiple different threads, and it seems to be controversial what negative to ground from what system. Victron looks to recommend negative grounding both battery systems and the inverter box to the chassis.

Any thoughts would be greatly appreciated.

 

[12VoltInstalls]

Would I also ground the negative for that system to the same frame?

The battery should have a ground to the frame but your equipment should utilize a ground cable NOT the frame.

 

[izban]

Thanks! To clarify, the 48volt battery system should have a ground to the chassis, and the inverter case should also ground to the chassis. What should the ground cable be used to ground?

 

[12VoltInstalls]

Thanks! To clarify, the 48volt battery system should have a ground to the chassis, and the inverter case should also ground to the chassis. What should the ground cable be used to ground?

The grounding to the chassis is a safety ground. It ensures that a compromised wire/cable will blow the fuse or other OCP before a ‘wild’ short causes a fire or other damage. It must be at least the same AWG as the largest conductor in the system.

The “what should the ground cable be used to ground” is NOT a ground. It is the neg(-) aka the Negative Conductor. All powered devices must have their own circuit, and not utilize the “frame,” chassis, or body panels as a conductor.

 

[izban]

Ok, that's how I understood it, but wanted to clarify. Thanks again.