Victron MPPT settings

[DGB99]

I have read a number of threads on this question without seeing a definitive answer. I have 300W solar on the roof of my 6.1 Ocean which has happily charged the two leisure batteries via a Victron 100 / 20 MPPT controller. I have now connected a Bluetti power station to the load connector of the MPPT controller and what appears to be happening is that the power station is being charged from the leisure batteries (as well as solar which is limited over the past few days) - for example at the moment with only 40W solar I am 4 bars 'down' on the VW panel and the MPPT app indicates the vehicle batteries are at the bulk stage and at the same time the controller is charging the Bluetti. I assumed the controller would not charge the Bluetti until the leisure batteries were fully charged.

Have I missed a setting I need to change?

 

[WelshGas]

I have read a number of threads on this question without seeing a definitive answer. I have 300W solar on the roof of my 6.1 Ocean which has happily charged the two leisure batteries via a Victron 100 / 20 MPPT controller. I have now connected a Bluetti power station to the load connector of the MPPT controller and what appears to be happening is that the power station is being charged from the leisure batteries (as well as solar which is limited over the past few days) - for example at the moment with only 40W solar I am 4 bars 'down' on the VW panel and the MPPT app indicates the vehicle batteries are at the bulk stage and at the same time the controller is charging the Bluetti. I assumed the controller would not charge the Bluetti until the leisure batteries were fully charged.

Have I missed a setting I need to change?

Yes. You need to read the manual and set up a bespoke setting to protect the Leisure Batteries otherwise the MPPT will continue charging your Power Bank until the Leisure batteries drop their voltage to 11.1v or the Power Bank is charged .
The Load Setting uses power from the Leisure Batteries Not excess Solar unless set correctly.

 

[DGB99]

Thanks for this - I have selected Conventional algorithm 1: OFF when Vbatt < 11.1V, ON when Vbatt > 13.1V.

What happens between 11.1V and 13.1V?

The alternative would be Conventional algorithm 2: OFF when Vbatt < 11.8V, ON when Vbatt > 14.0V.

Is this a better choice or should I use a user defined algorithm?

 

[WelshGas]

Thanks for this - I have selected Conventional algorithm 1: OFF when Vbatt < 11.1V, ON when Vbatt > 13.1V.

What happens between 11.1V and 13.1V?

The alternative would be Conventional algorithm 2: OFF when Vbatt < 11.8V, ON when Vbatt > 14.0V.

Is this a better choice or should I use a user defined algorithm?

My reading is the Load Output switches On if the Vbatt ( leisure battery) is over 13.1/14.0v and then continues supplying power until the Vbatt drops to 11.1/11.8v.
So, I would suggest a user defined algorithm of 12.7 and 14v. But I'm no expert.
You could ask on the Victron Forum?

 

[DGB99]

Thanks again - that makes sense. I will try both !

 

[Neuromancer11]

Yeah it is frustrating there is no way just to divert all solar to the load side without it drawing from the battery, that way you could guarantee that you don’t pull down the leisure batteries to the point the fridge turns off (which is what happened to me)