@dannybeardsley
If you need help making these changes or would like for me to make them for you, let me know.
How many batteries do you have and which batteries are you using?
@eric Thanks for responding, but it's not that helpful. I understand the settings (read the docs many times) and I've set the discharge current limit lower (50A) because I've got smaller batteries (and smaller wires) and I'm working on expanding them.
The problem is that the 6000XP is switching into bypass mode when load is significantly under the limit (and there is plenty of solar), and not switching out. Here's another example from today where you can see where there is plenty of capacity and yet it's stuck in bypass mode for 25min:
> Battery Eco Enable: Disable
I've read the docs and I definitely want this on. In this situation, the batteries are nearly full and not anywhere near EOD voltage. This mode (battery ECO) is poorly named, but seems to be doing its job. The inverter will switch to bypass mode when the batteries reach the EOD voltage and come out again when they get a few volts higher. That isn't the situation I'm dealing with here.
> Charge Current Limit(Adc): 125
Again, I've set my limits lower (50A) and the inverter is respecting them just fine. However it still randomly goes into bypass mode when loads are low (13A) and there's tons of solar power available to handle the loads.
> How many batteries do you have and which batteries are you using?
I'm using Tesla Model S battery modules and I have two of them in series (about 6-8kwh). I'm soon expanding to 12 of them which will give me about 36-50kwh of capacity.
For your battery bank, are you using a BMS?
Not yet, but I'm working on creating a large battery box with 12 Tesla modules and will have a BMS then.
@dannybeardsley I believe adding a BMS would help the inverter more accurately read the battery voltage. It does appear that the inverter is having difficulty detecting the correct voltage. This could be causing the inverter to switch to grid.
@eric Yes, now that I have a BMS, it does a better job of getting the voltage. I've also ramped my max amps up to 200A (charge and discharge). And yet the problem continues to plague the 6000XP.
the reason your inverter is pulling from the grid is because your amps are way too low on the Discharge setting
Certainly, spikes above the limit that I've set drive it into bypass mode. But once the spike has subsided (currents well below the discharge limit), it tries to switch out and seemingly fails every 4-5 minutes, sometimes for a long time.
> You should have that set do the discharge capability of your batts
Yes. I set it to a value appropriate for the wires I had at the time. I've upgraded the wires to ones that can handle more current and it seems to stick in bypass mode for less time now, but it still goes into bypass when currents are low.
Here's an example from today (screenshot) when it goes into bypass mode almost each time the refrigerator kicks on. I'm betting it's related to power factor as another user has discovered
it should be at least 125 amps to run that inverter at 6k watts.
Right, though actually slightly more 6000W / 41v (When batteries are low) = 146A. That's true, but this isn't about situations where I'm pulling anywhere near 6kw as all the screenshots demonstrate. Also, in many cases, there's ample solar and battery to cover the loads.
Looking at that screenshot, it looks exactly like my 12000XPs when it switches to grid power because of EPS overload. IMHO, limiting your amps so much is the problem because you’re taking away any headroom built into the system, I understand you have to because of your battery but I think that’s where your problem is coming from.
the reason your inverter is pulling from the grid is because your amps are way too low on the Discharge setting
I understand how that works, but as you can see in this graph and all those that I've posted, the power draw is nowhere near my discharge amps limit (which I've now raised to 100A).
Here's today where you can see loads are about ~1kw - 1.5kw with the batteries fully charged. And yet it randomly goes into bypass mode and sticks there for a long time. This even is listed as "EPS Overload" even though I'm way under the max output for the inverter and way under the max output from the batteries. There's also enough solar to easily power the loads as well.
I'm noticing this happening much more often when the batteries are full and the 6000XPs solar charger is effectively in the "float" regime as it has been most of the day today.
It just sure feels like a firmware bug.
