Can I use Smart Shunt with Wakespeed 500 and Small BMS NG. I do not have cerbo

[HansBrodin]

I will upgrade my alternator and use it for charging Victron NG batteries. I will use a Small BMS NG and Smart Battery Protect for stopping the charging and prevent draining the batteries. I do not have a Cerbo. Can I use a Smartshunt as the shunt for the Wakespeed 500. There are no small terminals on this shunt? Or do I need a separate shunt for the Wakespeed 500?

[chrigu]

@HansBrodin

Smart Battery Protect for stopping the charging and prevent draining the batteries

This will not work, at least not when using a single BatteryProtect for both charge and discharge, since BPs are only unidirectional. So you could use one to shutoff loads and another to shutoff charge sources. But even then i would be cautious with shutting off a charge source with a BP. Theres scenarios where a reverse current can flow from the battery to the charge source, which would instantly fry the BP.

@HansBrodin

Can I use a Smartshunt as the shunt for the Wakespeed 500.

I assume you are talking about the shunt capability that the WS500 offers? For this you need a bare Shunt, without the electronics, see this post for example

Wakespeed WS500 Alternator Shunt or Not?

With the Lynx NG BMS and batteries you strictly speaking do not need the SmartShunt / BMV on the batteries as the Lynx BMS has a shunt built in. The Cerbo will force DVCC on when connected to the Lynx, however, you can leave the WS500 DVCC off. In your case I would suggest taking your SmartShunt / BMV and setting it to a DC energy meter and swapping it to either measure your additional charger so the Cerbo knows about this or measure the DC system that the Cerbo does not know about. The WS500 n…

But adding a shunt to the WS500 wont help much if theres nothing reading that information. I recommend to use a GX device and a regular VE.Bus BMS NG. The WS500 fully integrates into the Victron system, through Canbus. Then theres no need to physically switch it.

[pwfarnell]

The VE Bus BMS should ifeally be used if there is a Multiplus/ Quattro type inverter, a work around is required if there is no inverter.

The Small BMS as per another BMS can shut down the WS500 from the ATC signal to the feature in wire.

There is a new BMS coming soon based on VE CAN which may be better, but I am not sure about expected date.

[chrigu]

@pwfarnell

The VE Bus BMS should ifeally be used if there is a Multiplus/ Quattro type inverter

Yes, thanks for clarifying. I was confused with the Lynx Smart BMS, so theres no real benefit over the SmallBMS here.

@pwfarnell

feature in wire.

I suspected that but never used it myself

[HansBrodin]

Thanks for your replies. I will use two separate smart Battery Protect one for charge and one for discharge. And as I guessed a separate shunt will be needed for my Wakespeed regulator. I will also use an Victron Argofet and let my alternator also charge a small acid lead start battery. My Wakespeed Will be configured for Lithium but I belive it does not matter for the start battery. It should be charged enough anyway. Will this be a reasonable set up?