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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...

Interesting comparison. One thing missing I see is not accounting for self consumption of the power station. Given the size of it I would be surprised if it's < 100W. Apparently Zendure has quite high self consumption well above 100W. Assuming 100W self consumption, the power station won't...

You can pick a few loads you are concerned about and measure the current on vs off grid to see the difference. Frankly, I doubt you will see loads drawing much more current at 240V vs 252V. For large resistive loads (e.g. electric dryer/oven) you will likely see noticeably higher current draw...

Thanks for the explanation. Frankly, that is not AC coupling. Many inverters can already sync to the grid and provide power in parallel with grid or charge from the grid. A great feature but that's not AC coupling. AC coupling requires having the ability to curtail power from grid-tied...

Look forward to further updates on the unit. It would be impressive if it actually has working AC coupling (i.e. frequency shifting control of grid-tied inverters) off-grid as advertised. A potential red flag so far is that there seems to very little documentation available with no mention of...

Are you confident they will actually honor the warranty if you need a replacement? https://diysolarforum.com/threads/shenzhen-basen-docan-quotes.39640/post-647970 IMHO, aside from the often opaque/unresponsive seller communications, there are just too many horror stories with...

That's false advertising for anything but double-conversion online UPS. It's a bit surprising to see given all the forum reports about interruptions. Perhaps you can file a claim with Tesla and get them to buy online UPS's for the affected loads.

Where is that from? Can you provide a link?

Why did you think that?

The reality is that politicians survive on other people's money. My questions is how much did the solar/green/clean industry companies/groups contribute to Newsom's campaign? Frankly, I think the solar equipment companies (Enphase alone had $100M+ profit in 2023) could have easily contributed...

I applaud the letter and effort. The points are about IOU's and exec's are great but pretty well known at this point. IOU's rightfully work for their shareholders to grab as much profit as possible. That's their job. OTOH, CPUC is supposed to work for the ratepayers and stop the IOU greed...

And you have no real warranty at that price. Most battery warranty is only 10 years or less. So, counting on a 10+ year loan for ROI is risky. Also, many people don't stay at the same place longer than 10 years.

Looks all the shady sales people from mortgage and pharma industries moved over to solar.

State/local governments should own most distribution/transmission networks just like other major critical infrastructure (e.g. roads, water, etc.) instead of for-profit monopolies.