PV Shunt Location and Fuses

[Justin]

I know the main battery shunt has to be on the positive side before the battery fuse. Does the PV shunt have to be before the fuse. I know it would be after the main shut as shown in the diagrams. Can the PV shunt be were the positive from the solar panel connects with the positive bus bar. I would feel more comfortable about the PV shunt after the fuse. I assume it's OK and recommended to fuse the positive PV wire between the shunt and DSSR20 and between the DSSR20 and panels.

Someone on a Facebook Victron group is telling me that the 24V Multiplus 3000 should have the 300A fuse it calls for on the DC Negative. In all the diagrams I've looked at it appears to be on the positive side.

I also have a small 24V 300W inverter. I'm planning on wiring it through a Victron BatteryProtect BPR with other small/medium DC loads. Would it be OK attach the leads to the 24V fuse/distribution box with a appropriate fuse. Or should it connect directly to the BPR relay? Thanks for all your input and helpful suggestions!

[Dacian Todea]

Justin,

You will have Battery+ then battery shunt then PV shunt so nothing between battery+ and shunts.  After the shunts you can add fuses or circuit breakers.

Same as shown in the user manual. The important thing is that shunts need to be at Battery+ voltage levels no matter what happens.

If you are worried that you can touch the shunts with some negative wire and create a short circuit then just have the two shunts in a isolated box and if you want you can also install the breakers/fuses in that box after the shunts of course.

You will have a fuse for the larger inverter and then a separate fuse or circuit breaker for your DC loads.

You can just have an electrical box where you have Battery+ wire coming in and then inside the box you have battery shunt, PV shunt and Load fuse/breaker and PV fuse or breaker then of course the wires for Load and PV getting out of the box.

Since inside the box there is only Battery+ voltage level you can not have any short circuit and outside the box all wires are fused with fuses inside the box everything is protected for any sort of fault.