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50v is pretty low in setting 13. When the generator starts and battery charging begins, the voltage of the battery will go above 50v right away with most types. What battery chemistry are you using, and what are your settings for 5, 19, 20, 21? A few proper adjustments will resolve your issue...

Can you share your settings of 01, 11, 12, 13, 14, and 24? I assume you want the dry contacts to start and run the generator when the battery is low, charge the battery, then shut off? The dry contacts operate on a combination of these settings, and I think we can find what needs to be...

"Solar optimizers" are probably what you saw in the video. The maximum power point will differ per panel, but a MPPT controller treats the array as one. It makes sense to see an output gain by adding MPPT capabilities at a more granular level. An in-line solar optimizer is one way to do so...

Yeah, that would be the way to go. Everything looks fine with your wiring. I would suggest 2 things to aid in troubleshooting: 1. If you are at location with on-grid power - temporarily run a ground between any grounded metal electrical box and the AC input ground terminal of the Growatt...

You should look into grounding options for the cabin. Unless you have some existing copper water pipes running deep into the earth, you may need to install a grounding rod. Connect that to the inverter AC ground - input or output (they are connected together). Same for the generator - there...

I don't see anything on the AC input. Do you have any other external grounds? If not, there is no ground reference, and the tester will show failed results. Additionally, the Growatt unit does not bond neutral to ground when the inverter is generating AC. Even if the unit is grounded, you'll...

Fuses are always a good idea.

I ran the generator test today, and the results were good. The test was run with a single Growatt SPF 3000TL LVM, the 48V version. I have a pair of them, but the 2nd was fully disconnected for this test. The generator is 223cc gasoline and rated for 3750W continuous, 4750W surge. It is branded...

Translated docs attached, if anyone else is curious. Please excuse the table formatting that got trashed in one - looks like most of that was already English. There is a lot to digest. I should probably create a new thread, as to not derail the existing discussion here.

No need to apologize. (I have past experience with the demands of the IT field too) Wow, that's awesome they did provide some protocol documentation. I skimmed through - looks useful. I'm going to play around translating the non-English parts, and see if this idea is feasible.

I've been watching this thread, and suspected this was going to be their response. I am curious what you happen if you responded with something like: "My battery supplier is interested in making their BMS compatible with the Growatt inverter. They asked for documentation of the communication...

Try the settings Joe suggested first. This is a known issue, and there has been a lot of recent discussion: https://diysolarforum.com/threads/growatt-odd-behavior.22696/ I don't personally have anything to contribute, as my load currently exceeds my battery and solar capacity. What value do...

I have a pair of Growatt SFP 3000TL LVM-48P, currently only 1 unit installed, but have been testing for over a month. First of all, I agree with the others - the inverter should be sized appropriately for the loads you intend to run. It has also been pointed out that the 40A current limit is...

You are misjudging based on the size of the solder mask, which is the translucent green layer. If the solder mask wasn't there, you would be able to see that the entire rectangle cutout of each side is 1 big electrical trace on the PCB. Also, note the grid of small circles around all wire...

Sure - I will post results, but it may be some time until I get everything else in the system finished up.

I have a pair of the same Growatt units, but the 48V versions, though I did not notice that in the manual. I have a 3500W gas generator that I intend to test at some point. That seems like an oddly-specific requirement. The only technical reason I could see for the requirement is when the...

Correct - the information they gave you does not match the model you have. I am 100% sure that you should NOT proceed. Where do you live? Their picture of a home electrical system is not accurate for US split-phase system, but the inverter you purchased is for US 110/120V. The diagram shows a...

I see your point. I didn't do the all the math, as there isn't really a point in me second guessing inverter choice now.

The non-ES model MPPT voltage range specified is 60-115Vdc - basically the PV array must be above battery voltage to harvest solar energy. The new ES model shows 120-250Vdc. I also see "Start-up Voltage = 150Vdc±10Vdc" listed in the specs, though it is unclear if that only applies when operating...

Let me save you some time, and potentially some consultation money, An electrician is going to turn down this work, for several reasons: 1. This is not a grid-tied inverter. It does not supplement power, like those retrofitted into houses by the professionals (SolarCity, etc). It is not...

I have a pair of older (non-ES) models. The fan noise is better than I expected. Fan RPM is under intelligent control based on load and PV charging rate, and much better than the MPP solar 1000W 12V inverter/combo unit I tinkered with about a year ago. I am currently only running 1 of the pair...

The manually intentionally lacks this. Your MPP inverter is designed and marketed as off-grid. Will's videos and website are a great help to build a basic system, with an extension cord output. Connecting a whole house is well outside the scope of his instructions, as a beginner should not...

The ground/neutral bonding box utilizing the dry contacts on the inverter is probably the most correct answer, though I am failing to find a technical reason why the neutral jumper is "bad" as a permanent fix.

You are probably right. Your setup will run loads without issue, and most people will not notice or perform additional AC tests. Since bought 2 of these inverters to do split-phase in a house, to feed a separate load center, I wanted to make certain I understood the capabilities and shortcomings...

Yeah, hopefully they can assist with missing setting 24. Mine is available to set, even while powered on.

I can answer some questions about how the Growatt handles ground and neutral bonding. Short version: it doesn't. Long version: I have the 3000w Growatt (SPF 3000TL LVM-48P) and have stumbled upon some neutral and ground issues while testing mine. I'm just going to brain dump my observations and...