Most reacted posts

6 48V EG4s. There isn't a lot of space in the cabinet to add a fuse for each battery, but I saw another recent thread about whether the BMS disconnect/breaker built into the EG4s might be sufficient without fusing each battery. I'd love your thoughts though if there's a better topology I should...

Good to know! I will return these and take a look at some other options. Appreciate the help!

Haha no worries. I personally started this conversation confused so I don't think I am any more confused :P I genuinely appreciate the discussion/help. We're all learning here! :) If I understand @FilterGuy's diagram (and that's a big IF), I don't think anything from the inverter or premises is...

Are you saying you have multiple batteries and the DIP switches behave differently across them, i.e., if you configured them with the exact same DIP switch settings they would read as two different addresses in the BMS software? I wonder if it's a battery batch/BMS version thing? Thankfully, all...

@timselectric The screenshot you're showing is what Solar Assistant looks like after it has been activated and registered. You won't have a Site URL if it's not associated with a site. I didn't buy the preloaded hardware, but I do find it strange that the site owner is shop@solar-assistant.io...

I set mine to 70W. I don't know about the correctness. It's not listed in the inverter documentation so I just googled and found a few references to this value. Would that account for a 2.5x difference though?

The fans will also kick on when using AC battery charging (at least at >= 30A to the battery - I haven't tested lower) or when powering large loads. They're quite loud. I've actually changed the output source priority timer so that AC battery charging will not occur until I am up because...

Can you share a screenshot of that section of the configuration tab? I'm not familiar with the Growatt inverters, but just assuming there's only one place to plug the USB cable? It looks like a USB type B plug: Although it shouldn't matter, have you tried plugging it into a different port on...

This may be a silly question, but did you update setting 01? The default is to run in utility/solar/battery priority. It must be set to solar/utility/battery by adjusting this setting. Please see page ~16 in the manual. I’m not sure about the solar charge controllers in the EG4 inverter since...

Thanks, I'll investigate this further! I had come up with the original topology because the cabinet housing the batteries has built-in bus bars so it felt easier to treat the cabinet is one big DC source as opposed to individual batteries. I do like eliminating the 4/0 run on the positive side...

I'm not forgetting that charging today replenishes the battery from discharging the day before. The values I showed are monthly aggregates and every month shows > 2.5x delta between charging and discharging.

What's equally surprising is that MPP and the distributors sell a 2-inverter bundle. I've asked my distributor whether MPP has disabled the automatic N/G bond in one of the 2 inverters. I suspect no, but hopefully will be pleasantly surprised that they do. My understanding is that opening the...

I haven't measured. With no charging, no PV, and low loads, I can't hear them unless I'm in the garage. Thankfully, this is about 95% of the time for my use case.

The fact you're seeing ACM0 is a bit suspect. That *is* a USB communication device, but it seems not one Solar Assistant is expecting for the Growatt inverters. One thing I would do to verify this is unplugging the Growatt USB cable and verifying that the ACM0 device disappears from the list. If...

Cross-posted - I guess you've already verified it. I'd reach out to Solar Assistant support to ask about it because none of their configuration guide for Growatt mentions the presence of an ACM device.

Sorry, I reposted those from someone else on the forum. See my first post in this thread for my numbers.

Ah, got it! Would this be as simple as connecting the chassis of one of the inverters to the negative bus bar? As I mentioned, the MPP does not have an externally exposed EGC for this purpose. If this is correct, would it matter which chassis? Should it be the one that has the N/G bonded?

"Ground" is only mentioned on 3 pages of the LV6548 manual and it doesn't mention anything about the battery bank and the part about PV is mentioned twice in the manual:

Free between 9pm and 9am? Wow.. we pay $0.18/kWh from midnight to 3pm and then around $0.47/kWh from 3pm-midnight. Your use case and initial motivations are pretty similar to mine! Started as whole-house backup, then realized I could buy during off peak and use battery during peak. Works well...

Sorry, yes, a DC ground lug. Even if there is continuity, I'm not sure the terminals are large enough to accept two conductors. I will investigate and report back. I'm sure others with LV6548 have figured out something. I'll do some searching on the forum as well.

I'm using a different manufacturer but more or less the same inverter as the 6500EX-48. I'm not sure if this is a concern for you or not, but I want to discharge my bank to ~30% then charge only during off-peak hours (30% is enough headroom to get me to off-peak without hitting the low voltage...

Since troubleshooting this issue is not really related to this thread, you might get more help posting a new thread, or feel free to DM me and I'm happy to try to help. The LCD display probably has all the information you need to understand how the inverter is operating. Without a battery, it...

The batteries were at 100% SoC when the system went online.

I checked the inverter settings to see if there was anything that might control the USB communication port, but I didn't see anything. It doesn't seem like it's broken though. A device registering as /dev/ttyACM* is a type of USB device so there's nothing inherently wrong with that. You can read...

Well that's embarrassing... mental math doesn't work so well late at night :P I'm not sure what the LV6548's are supposed to use when (mostly) idle, but I was measuring about 70W per unit and with two units, that does indeed account for nearly 100 kWh per month which is mighty expensive at a...

Ahh right, thank makes complete sense. I will test for continuity between these two terminals.

As far as I can see from their manual, there are no other USB type connectors on the device. That was my original thought as well, that perhaps there were multiple.