I have Smartsolar 150/70 MPPT. What would be the concrete benefit of adding Smart Battery Sense? I won't add any device that has to have bluetooth constantly on so is there a wired version, in case the benefits are great?
asked
How much benefit from Smart Battery Sense
@pekkaj the SBS is used to provide an accurate temperature and voltage reading that the mppt can use to provide temperature and voltage compensation that the mppt uses, for batter battery charging.
The battery current consumption is very low, betweem 0.3 - 1.6 mA depending onits operation.
If you already have voltage, current and temperature shared to the system via a shunt, none whatsoever.
When charging, the MPPT will always measure voltage high, hit absorption voltage before the battery is, and will start to taper current. A SBS will make charging a little more efficient.
If you're charging lead-acid, you need some kind of temperature sensor to provide the MPPT with accurate data for temperature compensation. If you don't have any temperature sensor, you will shorten the life of your batteries.
Battery is lifepo and I will have Victron shunt for battery monitoring. So shunt data can be shared with MPPT via wired protocol?
Still wondering what is the difference for optimized charging? 1% more charge? 5%?
@pekkaj 1% more charge? 5%?
My mppt 100-50 will have a 0.5v difference between the mppt and battery terminals at high charge currents. That potentially means the mppt could go into absroption (14v) while the battery itself is at 13.5v. Voltage compensation fixes that problem.
Aslo while lithium batts dont need temp compensation, it is handy that shared battery temp can be used to disable mppt charge at low temps, to keep your battery safe.
Just confirming that Smart MPPT is utilizing data that BMV-712 sends in shared bluetooth VE.Smart network. I want to switch to wired communication though so configuring the system with Gerbo-S will be next step.
