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PG&E came and pulled the data logger. The very nice troubleman said it was the oddest combination of symptoms that he has seen in twenty odd years in the area. As we chatted, we watched the voltage steadily rise at the meter, despite the fact that the exported power was staying constant. That...

Sounds great! Any chance to tie into more granular data, e.g. microinverters? All the best, BG

Always happy to learn. Do you have a link to that Fronius feature? I'm not finding it. I guess that we had a good installer. Our microinverters are well mapped. Like @sunwarriors there was essentially no price difference for microinverters when we had solar installed, so to me, trading up from...

Do you have a reference for that efficiency number? @Vines makes some great points about the ROI for the added cost of microinverters that I think are completely valid. Despite those points, I wanted and have microinverters, knowing the extra cost, for two reasons; 1) longer MTBF (mean time...

Or different inverter / microinverter brand...

Congratulations ! I would try rebooting your phone first, and then if that doesn't work, try uninstalling and reinstalling the app. If not, I'm afraid it is back to Tesla...

Thanks for correcting my math! Since the meter is "revenue grade" it is supposed to be more accurate than that, but that doesn't mean that this meter is. I can confirm that the meter voltage matches my DVMs, and matched the current of the clamp on Fluke meter when it was at 6.kW export, so I...

It certainly could be a bad connection on the service drop. The utility has futzed with it several times; once to replace a transformer that blew (lightning, followed by a floating neutral issue a year later that killed it), and then a year later to replace some (all?) of the service drop due to...

@wwhitney Thanks. To answer a few of the questions; The house was disconnected by opening the main service panel 200A system breaker to the meter. (and it had been off for about 70 hours) It was 6:30am, so no solar, no export, and the normal minor house loads totaled 0.6kW, double checking on...

Update: PG&E still has the power logging monitor on our meter. More odd voltage behavior; the house was off-grid Friday afternoon through Monday as precaution against solar storm induced voltage variations. With the house isolated, the voltage at the meter matches two other meters a mile...

Well there is already, off grid. The TEG has no issues communicating with our Enphase hardware to alter production up or down, as needed, via frequency shifts.

No worries! I've been burned a few times, so I try to remind myself to double check where posters are before responding. ;) All the best, BG

Unfortunately, that is a North American number. The OP is in Portugal... Tesla lists a slightly different number, +35 1800180397. All the best, BG

In off-grid mode, the way the Gateway adjusts the solar production is by varying the frequency. That is a design and regulatory feature, developed not to have to run communication cables to panels, or via zero crossing signals.

Quick update: PG&E came out and load tested the service drop, and then did a load test of the transformer and medium voltage line (by ramping up to 700A/phase, in short bursts). Both passed. He added a power analyzer to log data for a week and then it goes off to engineering, so probably no...

Yes, always on their end.

I worked at a location where the local utility used to throw a switch at six every morning, causing a 1-3 second power loss. The computers on our machines did not take the drop out at all well. I ended up putting in an enormous ferroresonant automatic voltage transformer to store enough energy...

Update: voltage is back up today. This feels like it is going to be an adventure... Same glitches in the solar curve; bright sun, no clouds either day. All the best, BG

That's very helpful! Any suggestions on what to look for in a power line monitor / data logger, or particular models? Since I won't be earning a living with it, I'm a little reluctant to shell out $4k+ for one. I haven't used one in decades... All the best, BG

Background: for the last six months or so, we have been having "over voltage" excursions, i.e. more than 250V AC at the meter. It took me a while to realize that the system response on one of UPS units was caused by it detecting an over voltage situation and going into a protective mode to...

Definitely many ways to skin a cat, and the more the merrier!

Sorry, I did miss that, but the particular utility matters, too. I suspect that PG&E will have a proximity issue to the gas line/meter for the proposed location in the first photo. The line diagram, and your second photos seem consistent with what has gone through. A 60A breaker supports a...

If you have specific concerns on some piece of electrical hardware that is specially sensitive to transients and harmonics, then I think the issue is about isolating that piece of equipment. If this is a general solar specific concern, I would have no concerns about harmonics and transients...

Can you update where are you located? The utility and the authority having jurisdiction matter for many of your questions. California? PG&E?

Storage is good, but I think that there are other, perhaps more cost effective options. To my way of thinking, it doesn't have to be just storage, rather more ways to absorb excess/low cost production; e.g. production sensitive EV charging levels and rates, building preheat/precooling...

The US has a more complex regulatory structure, but I hope that it will come to the US sooner rather than later. The UK has had time of use pricing for decades, historically largely for overnight heat and hot water. Texas has dynamic pricing for some plans for some time, and during the 2021...

Our experience is similar. FWIW: While we are in the same general area, the discharges here also seemed more nuanced in 2023, with varied rates. I remember one in particular that seemed as if it was designed to demonstrate some level of production, as the date and time of the event did not...

That makes sense. Thanks for clarifying . When living in a cold climate, we used to vent the dryer inside. Yes it does add considerable moisture to the house, but that is often a good thing in the winter time, or at least was for us. The more challenging issue was designing a large, fine lint...

That's true, but the energy is used mainly to evaporate water from clothes (cooling the dryer air), and then the water is condensed and drained, and the refrigerant is compressed, and the warm refrigerant is used to warm the previously cooled dryer air. A little energy is lost due to friction in...

Gorgeous! Yes, I can see that if your geothermal needs back up resistance heat, that could be a significant issue. If the geothermal runs 0.7kWh (16kWh/day) what creates the other 64kWh of load? I'm used to seeing heating dominate in NH in winter. I would be tempted by a diesel generator, and...

What is your question?

This is a bit sideways, but have you looked at adding insulation? E.g. windows, insulated window coverings, attic, walls, etc.? For winter outages, I think it is either, suffer, or wood heat and candles, or a generator. The latter requires a transfer switch and does not play well with...

Out of curiosity, how close is that the the yellow energy label on your water heater? (Make/model?) All the best, BG

@Matt-FL Thanks for sharing the wind direction and speed data. People have done (small) studies with forced ventilation under solar panels. In every case that I have read or seen, the energy gain is much larger than the energy used in the cooling fans. It is one reason why ground mounts are...

Even a water heater in a conditioned space is significantly warmer than the area around it, and thus the water heater does have significant energy losses. I think that every water heater should have an extra insulation blanket on them. The blankets are cheap, installation is straightforward and...

To save more energy, I think that you will like a heat pump model, but I would ask how close the water heater is to sleeping spaces. They are noisier. You might want to double check the energy use on that dryer; is it a pure heat pump or a hybrid model? Whirlpools aren't terribly efficient...

Any given panel has a decrease in output per degree of temperature rise at the panel. Typically, it is in the range of about 0.5%/deg C. There is every reason to suspect that the panel temperature is not linear with respect to outside air temperature, and small changes of wind direction and...

Do you have a sense for how many kWh might be in your "excluded" green peak? (Per day? Per year?) I would look for a DC loads that you might be able to add; hot water heating elements (inexpensive), a programmable controller for other DC loads, e.g. DC AC unit(s), DC freezer fridge, or even a...

I do not see how @xrg458 can game this much if the inverter output is throttled. I think a little could be done by a fake utility rate would help, but as far as I know nothing short of CT monitors on the inverter and on the EV, with a variable EV charger would likely optimize the inverter output.

As the above proposal does not make mention of the existing fees, I can't tell. It quotes text from '205 requiring " It then goes on to quote a two dollar reduction in monthly fees for FAER consumers; Not sure whether "fixed charge" means MDC or something else.

For a little transparency on how the IOUs propose to track income; https://docs.cpuc.ca.gov/PublishedDocs/Efile/G000/M520/K530/520530748.PDF Basically, they intend to leverage the income information that they have for FARE customers into two tiers, and lump all other customers into the highest...

Well, if you keep the antenna cable, you would be able to use WiFi, if you need it.

You have taken some reasonable steps in my view. While it is not an unreasonable concern for some people, but given that someone would have to have access to something within WiFi range to pull it off, it does limit potential attacks to being near by. If this a serious concern, there are a...

Yes, that would be desirable, but Tesla doesn't have that AFAIK. I do think it is prudent to assume that devices will be hacked into, though not necessarily just from WiFi. Plan A would be to run a dedicated Ethernet cable to the Gateway. Once a link is established over the wired LAN, it is...

What is your desired goal here?

Consult your tax professional is as good as it gets. Whether any one did or didn't is not IRS sanctioned guidance and should not, at least in my opinion be relied upon.

We are close to the same situation, with lower demand, less solar, and same storage. Following your analyses elsewhere, I realized the importance of the MBC /NBC offset, and went from self powered, to time based control. I am still fiddling with charging times for the EV by manual starting the...

. Perhaps I should have called out in the original post that the vertical is percent of nominal voltage, I.e. 110 means 110 x 120 = 132V. Sorry for causing any confusion. The original post language, and details are still accurate. BG

Isn't your contractor dealing with this? How about bring the PV conduit in to the right to avoid the issue? In general the concern tends to arise around things like regulators that have the potential to vent gas near things that might serve as ignition points.

Again, guessing here, that type of parameter tends to get set somewhere in firmware because the upper limit is a function of the limits on the control hardware (Tesla) and (probably) design goals for minimizing the voltage to which the customer's equipment is subjected to (NEMA/CBMEA/ANSI). In...