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Have you seen WiFi affect how scheduled charging works?

It has been known for a while now that Tesla does not block limited DC discharge. Basic V2L products for Tesla and other EV's have been available for over a year now...

Nuisance GFCI tripping is common for not just UPS or power condition/storage devices. Any sizable inverter based device can cause the problem. The root issue is inadequate/inconsistent UL and NEC specs for GFCI breakers that result in nuisance tripping due to high frequency/transient noise...

Just curious, is this supported by Tesla?

A 48V buffer battery is certainly an option. Many possibilities including charging an EV if there is enough excess solar power.

It's probably because it can't switch direction fast enough. It's an inherent challenge with high frequency inverters. Another possibility would to use a separate charger that uses enough AC power to charge the F3800 via a DC input port to avoid excess power backfeed to the AC output port.

It would be pretty ridiculous if there is no offset.

The lowest likely monthly fee I've seen is $24 so that would already be above your estimate not including any other potential NBCs.

Is that number still valid with new fixed monthly fee recently approved?

Great questions. It should be safe to try with a load larger than the max PV output and a full battery to see if frequency changes. I hope someone will try it.

Well ... the X1 also supports "AC coupling" like the F3800 but apparently is able to work with and control other grid-tied inverters so it's somewhat unclear if F3800 cannot do the same since it appears to have all the necessary power hardware components.

Thanks for the update. I've seen a couple videos showing "AC coupling" with the F3800 but they are just showing the unit sync to the grid similar to inverters that can parallel. It's not consistent with the long established definition of "AC coupling" for backup power inverters which is the...

Did you ever get the Home Panel and test AC coupling? It looks like Anker is now pushing Powerwall style AC coupled home batteries.

Current sharing imbalance across the relays can still be significant regardless. Also, AFAIK, the J1772 spec does not specify limit for inrush current when the relays close which can be very high even before actual charging starts.

I agree they could be DPST relays. Assuming they are, it's still a poor design practice as physically separate relays will never open/close at exactly the same time so current sharing will not be balanced. Over time that could degrade the contacts of one relay more than the other leading to...

Given Tesla's customer support reputation you should be glad they replaced your failed inverter in *only* 4 months :cool: Sadly, solar is nowhere near a set-it-and-forget-it appliance at this point. Like others said you should check it frequently as you have earned the privileges/duties of a...

Those relays look like SPST relays which means 40A on each 120V phase leg so it's still only 40A at 240V. If the rating is true then the relays are not safe for sustained 48A charging at all. It would explain the overheating issues reported.

That's quite limited. It requires specific manual configuration (e.g. Enphase grid profile) for the frequency shift for work properly. Also, There is no integrated monitoring or comms.

Same could be said about solar systems. There should be a manufacturer neutral way to control and monitor solar systems to avoid proprietary single vendor solutions like Tesla or Enphase that prevent or severely limit third-party integrations (e.g. bidirectional chargers like dcBel, smart...

What's the rating of the relays? The heat discoloration pattern suggests the overheating occurred inside the relays. For 48A charging, the relays should be rated for 60A or higher for long life. The bus bars connecting to the relays look hefty and appear to be fine.

Assuming the $24 is NBC, has anyone seen analysis on the likely impact on home solar payback under NEM3?

Yes, many ways to skin the cat :cool: If and when the duck curve goes negative frequently (e.g. daily) then POCO's can sell cheap TOU power to crypto mining farms as they easily ramp up/down "production" and they love any cheap power they can get.

That's was not the intention nor how I would interpret it but it's certainly no worse than the article making rooftop solar out to be the "culprit" as you interpret it. Can't scale? Just because of the duck curve goes negative at times? Even the article states that having to curtail solar...

It does matter to know the correct main culprit if you want to choose the best solution to solve the problem. For example, utility scale systems have more energy storage options (e.g. mechanical, thermal) besides batteries that are simply impractical or impossible at residential scale.

The link text looked reasonable but the actual article title ("Rooftop solar panels are flooding California’s grid. That’s a problem.") is misleading at best. The article conflates numbers for rooftop solar and the much bigger utility scale solar. The solar power curtailment mentioned in the...

Interesting. That's a lot higher running/peak ratio than regular HVAC. If your particular system only pulls 2kW max then it seems excessive to design backup for 10x that.

So, that's 26kW+ peak (21kW+ continuous @ 80% of peak) for heating? I don't know much about GeoThermal but I thought it's supposed to be efficient so the electricity requirement is surprising to me. Running batteries or generator even for 21kW of heating seems very inefficient. Have you...

We should just all work to get the POCO's to raise rates as much as possible :cool:

Did you get a quote for Enphase battery? It would be interesting to see what financial ROI Enphase thinks you would get with a battery.

True but that's not really different with or without PV. Putting 2 heaters on the same circuit is the real problem. Similar to the risk of people putting extension cords on extension cords. A small PV makes little difference to such risks.

Sorry I don't see any part of the circuit carrying 20A. I can see 16A at most supplied from the 15A breaker and that should trip it at some point.

This is has been done in Germany for a while now. No permit, no inspection, no interconnection agreement ... no problem. No need for US to wait. One reason why residential solar cost in Germany is half of US. IIRC, those guys are dealing with much higher (>>800W) power systems. Are you...

Did the off-grid system require permit and inspection?

It would be very unusual if Tesla is triggering overload fault based on voltage. For failsafe overload/short-circuit protection it's typically based on current. However, Tesla could be using a similar type of inverse definite minimum time (IDMT) curve for current. For any overload fault...

Sure but then they should be able to provide at least the threshold that was violated given that they actually take the time to record and report the fault.

A bit surprising that they would not know the surge level that caused a shutdown.

It appears that SPAN uses the unsupported API on the Tesla Gateway. You may want to troubleshoot the Gateway based on the info here SPAN - Smart Electrical Panel.

So, the hot hub is one of the backed up loads? Are these loads new after the PW's were installed? If so, the overload explanation would seem more plausible. The graphs do appear to show a pretty large power swing on the PW's right before they went down. Also, there is an alert for under...

It's risky to assume the external DC-DC current control will work as expected. Unless you know the specific impedances of the power station input and DC-DC output are compatible the MPPT can easily end up pulling the voltage way down. Fixed voltage and current supplies typically work much...

1500W should be okay for inrush. What's the DC charging current limit in the power station? Does it have adjustable control for DC charging current?

Thank you CPUC ... that's a nice return on the lobbying spend

https://a12.asmdc.org/press-releases/20240214-assemblymember-connolly-introduces-legislation-save-california-solar

Of course :cool:

I am sure whoever runs the DMV get paid well but I doubt the total compensation is anywhere close to $14M:

Another reason why even the DMV is 10x better than IOU's. IOU's claim they don't have money to fix problem so they have to raise rates while spending plenty of money for lobbying and propaganda commercials.

That makes no sense. It would make more sense if Tesla said the gateway switched to the PW's due to the log message. The grid impedance thing looks a like red herring.

Still 10x+ better than IOU's.

Exactly. The state needs to take over.

IOU investors?

Thanks for the info. Can you clarify how you determined the idle consumption? Does the comparison account for DC-AC conversion efficiency for the inverter? Assuming your 400W nighttime consumption is AC power and the inverter efficiency is 90% (optimistic at low load to max power ratio) then...