Smartshunt 300 or 500

DIY
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1

Hi, I know this kind of question has been asked before, but still I am hoping for some advise.

I want to add a smartshunt to my installation.

The main current-drawing device will be a multiplus 12/2000, which is about 166A at max
Although I am a bit unsure, because I was told I need a 300A fuse for the multiplus…(?)

Then there’s a heater that draws 10A max, some lights (all LED) and a toilet pump and a fresh water pump, that I don’t figure draw too much and barely at the same time.
And of course my ‘network’ of Cerbo GX and 2 MPPTs.

Should I be okay with the Smartshunt 300 version, should I get the 500 or is that overkill?

I reckon my Cerbo GX and 2 MPPTs don’t draw much at all and all charging currents only substract from the equation, right?

2

I recommend to do a small calculation, this will show you the “limit” of a 300A current. That is approximately 3kW of power. That is a lot for a 12V system. The cables will cost much more then a smartshunt, so yes - with the consumption you mentioned, a 300A smartshunt will be absolutely sufficient.

The other way round, if you plan to update your system in the future, the ~20€ more for the 500A version is not a big deal…

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