I noticed that when using “Self Consumption” working mode, the device would always use GRID to pass-through to power the AC even if the SOC is way above the set point. I observed that it would only use GRID to charge the battery unless the SOC is below the set point (PV can always charge), that is good. However, even when SOC is above set point (even if it is above by a lot, say target SOC is 50% and my SOC is 83%), it still pass the GRID input to AC output and not use the battery. This seems wrong, as I would want to “self-consume” the PV energy instead of using GRID to power AC out. I’ve read that there is a 10% buffer where it would continue to pass-through until SOC is 10% above setpoint, but in my case, my SOC is 83% and my setpoint is 50% and is still using GRID pass-through instead of battery. Why is that?
I have 1 x B300k and 2 x B300 connected
My max grid input current is set to 7A, charging mode is Standard.
My AC load is small, only around 70W, does this matter?
IoT v8026.12
ARM v2204.11
DSP v2174.11
BMS v1073.07
Hi snowstorm, yes something seems wrong. My unit is also set to self consumption and my SOC is currently set to 35%. My unit charges on solar with the grid being the backup. And yes you are correct as this leaves me room to get that free power. On a couple of bad solar days It will start drawing from the grid if I hit 35% and I have verified this and that it also stops the grid pass thru at 45% and switches over to the battery/inverter. Let us know what you figure out. I have no settings help for you this time as yours seem correct.
The issue I have is that it never switches away from grid pass through even if the SOC is significantly above the set point for self consumption mode. It never seems to self consume.
Have you tried changing your SOC setpoint just to see if you can get it stop grid draw? Maybe cycle the working mode a few times? IDK if it is possible it is stuck in a dif mode but showing self consumption. I can’t look at mine right now as it seems Bluetti’s servers are down in the morning and I get a greyed out connection until they restart the servers.
I was backing up my networking equipement at around 70w earlier, and it never switch away from grid pass-through. Just now, I plugged in a dehumifier and it drew total of 544 watts, and it switched away from gird pass-through to battery only. I wonder if there is a minimum wattage that is required to activate the inverter. Maybe if the load is small enough, Bluetti won’t switch to inverter as the inverter loss is greater than the load. I will do more experimentation today and see what’s going on.
Ok, I’ve done some more testing and observed that grid passthrough seems to persist even at SOC well above the setpoint if the AC load is small. With SOC 9-10% above set point of 70%, it would switch away from grid pass-through to inverter power if I load AC somewhere around 150w. If it is lower than that, it would switch back to grid-passthrough. I think this make sense as the inverter takes power to run, maybe 2% of its rating, that coupled with the 85% or so efficiency may make it not make sense to run the inverter until load is large enough. I wish Bluetti would explain this behavior more as it looks like something is wrong, or better yet, this should be configurable as there may be situation where someone really doesn’t want to use the grid in self-consumption mode.
