Victron SmartShunt sizing

[PCSB]

I'm looking at getting a Victron SmartShunt. They come in 3 different sizes, 500A, 1000A and 2000A. 

 

I currently have a bank of 5 x 115 AH domestic batts so a total capacity of 575AH. Would I be right in thinking that I need the 500A versions as the amp rating of the shunt is its max draw?

 

TIA,

Paul.

[Jen-in-Wellies]

No you wouldn't. You need to rate the shunt for the maximum current it is going to see, not the battery bank AH capacity. What size inverter do you have? That will be the biggest current draw. Add in extra current for lights, pumps, 12V fridges and the like. Get a shunt in excess of that. A 3000VA inverter, for example, could draw 250A to 300A, or more from the batteries, if it will support short term extra power supply. For most boats, a 500A shunt should suffice.

Edited October 13, 2022 by Jen-in-Wellies