Recent content by Kemills1

From what I remember, there are three temp sensors on the BMS (two are internal) and the temp displayed on the main page is that of the highest reading sensor. By dipping the battery temp sense in ice, the temp displayed will be that of one of the internal sensors.

Andy from off grid garage on YT has done a lot of testing of LiFePo4 cells and his videos provide a lot of insight as to characterists of the cells. There is a lot of useful info there regarding charging.

Battery tail current is a user defined parameter but I think you are referIng to the battery charge current as the battery nears full charge? Either way, the charge current is not “determined”, it is measured by the shunt and the value sent to the charge controller. If that value is less than...

Personally, I think that is the beauty of the VE.smart connection system. It is all done via Bluetooth and a more complex system using VE direct and a cerbo GX or similar is not required.

Agreed.

Sorry if I have this wrong but you seem to have missed the point. Terminate charge using a tail current strategy in a in service system is only feasible if the charger can monitor the actual current going into the battery. This is where a smart charger and smart shunt can work really well. Via...

Thanks, I was looking at the wrong charger. Correction, I was looking at the right charger (Blue smart IP22) but the manual makes no mention of ve.smart networking. However, it is mentioned in the features list.

Well, I have a 600Ah battery and I’ve set the tail current parameter to 1A (the max value you can set is 10A) and the absorb time is 15 mins. The charge current will drop below the 1A tail current setting before the 15 min absorb time has expired. I’m sure this strategy would work perfectly well...

If you don’t use the tail current feature, when does the charger go to float? I agree the feature is more useful for lead acid batteries as using a fixed or even adaptive absorb time is just a guess as to what the battery actually needs but terminating the absorb period on a LifePo4 battery...

Sorry but I’m still not clear on one thing. Does your mains smart 12/30 support VE.smart networking and goes it have the tail current parameter?

SOK have to push the charging parameters to the absolute max for the cells to achieve the claimed Ah capacity. Higher capacity claims sell more batteries.

Agreed. I also think it’s wrong to claim this charger is suitable for LiFePo4 chemistry when there appears to be no provision for low temp charge cut off protection.

The “tail current“ along with “Charged voltage“ and “Charge detection time” are parameters used by the smart shunt to determine when the battery is considered fully charged. When all the conditions are met, the SoC will be reset back to 100%. (Synchronized). The condition to be met for...

Not sure I would agree here. In photo 5 the cells are discharged and at rest. If there were a poor bus bar connection between the cell pairs 2 and 3, the cell voltage would have recovered with no load. Since the voltage has not recovered, I doubt it’s the bus bar.

Since the difference between the two is 0.3%, I’d say they are both equally accurate. The solar charge controller charges the battery to the same state of charge each time. If the BMS or smart shunt were inaccurate, the SoC would drift either up or down.