Search results

Note that if/when CRD PCS ever gets added to the UL listing, the intersection of 18kpv’s PCS modes and PG&E’s allowed PCS modes may not include any modes you care to use I want a charge from solar only PCS Mode that will force discharge when peak starts, AND the ability to enable charge from...

Mandatory solar has been a thing for years. There’s not that much new construction in California. And they slammed solar with end of net metering, which was years after mandatory solar

My questions would be -- What is the AC size, DC size of those installations? Are they DC coupled or AC coupled? IIRC AC coupled is a lot more onerous than DC coupled. EG4's answer I think is fine as long as you are willing to wait for final PG&E approval of the plans (not PTO, I mean...

You need to qualify the feedback by the use case of the people talking about it. It's engineering, not religious tenets. If you have good design skills and knowledge of how to install, DC coupled hybrids have a lot of advantages over microinverters for a typical home-sized system If you're...

These acronyms are from regulations/UL standards. These are referenced in Rule21 (power company rules) ESS - Energy Storage System. Referenced in Rule21, building code (most onerous are in Residential Code - Section R328. Review carefully the system size limits and physical placement rules, &...

SGIP funds are limited / exhausted in a lot of areas unless you're under specific categories like equity resilience

Good luck with it. I think Fortress rebadged the luxpower

FWIW 200A bypass and the service bypass switch some people like to use with their solar installs really stacks up the equipment costs vs 100 or 125A MidNite One thread somewhat has an explanation from their engineers on why they picked 100A bypass

OK the MidNite One does not have 200A bypass so that is out. I suspect the 12kpv will not either, but EG4 also showed what looks like a Microgrid Interconnect Device (presumably 200A capable) at a convention last month so that would be a way to get the bypass. Along those lines maybe you can...

Annoying situation is if you pay $5k for an 18kpv and EG4 never gets their 💩 together with PG&E. What about installing an equivalent capacity of grid tie capacity with the cheapest grid tie inverter (might as well do 1:1 overpaneling, you have approval for that already), and switch to a hybrid...

Thanks, that makes a lot more sense. How much are these components?

In very very few worlds is switching to NEM3 a good deal. Under NEM2 there is a very, very long break even point to paying off a ESS. I calculated mine at 10 years using forced export to push out energy between 4-9PM. Not great. The PG&E rules for ESS are very complicated. It's quite possible...

OK, sounds a little aggressive, but I'll continue to help since you have a decent Linux shell understanding and seem to have done a lot of homework already. I was referring to the DC UPS that I bought, which was underspecced on 5V. If the 5V browned out for the RPi4 , then either I return it or...

What part of the puzzle do you see this board solving?

USB is not isolated at all (neither power nor data) so it behooves you to understand how to work around it. RS485 adapters are available in both isolated and non-isolated flavors. Given how low bandwidth it is, I'm still surprised that the standard recommendation isn't to always use isolated...

The size of this community sounds like it's smaller than a lot of utility-scale solar farms, so I think the solar can easily be centralized before being distributed back out again

What is the control algorithm on the master inverter that is producing the frequency? Why use frequency signaling on a small grid, vs explicit signaling (separate control wires or PLC)? Frequency signaling needs to sort out the interactions with frequency locking. And explicit signaling gives...

Yes, you keep grandfathered rates if you add ESS to NEM1 or NEM2 with no increase in solar capacity. AFAIK you are not required to upgrade the GTI to one on the current approved list. That said 7600H is 1741SA according to Google, which is pretty new. I'm pretty sure there are several build...

You probably know this but providing the sine wave is only one part of the equation (and is a bit of overly simplified cringe, since it's far from the most important necessary condition in a functioning AC coupled system). It needs to correctly absorb the output power from the GTIs and defeat...

What can happen if OP has a fully legal system today and has not purchased any equipment yet? It doesn’t seem too hard/nonstandard if OP gets the appropriate CEC and POCO approved hybrid inverter. The hard part comes in with trying to do it with cheaper equipment, but you would pay for this on...

6000XP does not support that, maybe the next generation of LuxPower inverters at that price point might (no U.S. announcements)

Code compliant system requires a pretty high tier of battery and inverter (UL9540 listed combination). And hybrid that interacts with grid will have additional POCO and PUC requirements above that.

The chargeverter may not be listed. You could be slightly naughty and get the recycled EV batteries + off-grid UL1741 + properly configured rapid shutdown system past final inspection. And then slip in a chargeverter after they leave. Note you would probably need to pull two separate conduits...

Actually I think that code version is still in effect. ESS is covered in a few volumes of building code so you would probably want to double check with the AHJ to see if there are other places to check. https://up.codes/viewer/california/ca-residential-code-2022 Presumably you still need...

The section of code is R328. This is a slightly older version: https://www.lakecountyca.gov/DocumentCenter/View/5644/Changes-for-Residential-Solar-California-2022-Codes

The manual transfer switch gives you an extra measure of protection against something unexpected happening within the AIO. But for every hour connected to grid you are still at the mercy of the programming doing the righteous (for all hours where it is externally air gapped from grid it cannot...

If programmed incorrectly. There were some recent reports of POCO in other parts of the US sending nastygrams after detecting a few W of backfeed from AIOs that in principle should have been programmed and interlocked to prevent the combined charger/inverter from doing something bad With a...

Where is the discussion of UL9540 compliance to pass AHJ inspection? I don’t know of a AHJ in California that would not enforce it EDIT: did you verify if the exemption for recycled EV modules is still in effect?

PG&E rule21 does require commercial/industrial customers to notify them of this. Because of the change in usage pattern that needs to be accounted for in capacity planning. In theory (IE there is a policy PDF covering this). In practice I do not know if it is enforced.

That does sound like a Microgrid distributed control scheme that would have been written up and simulated by someone at some point. I don’t understand how the frequency is shifting downward. Is your description missing a sentence or two? Or there is an implicit assumption that load will pull...

What about airgapping Ethernet with fiber, and then finding an isolation transformer to airgap the power. You don't need that much power passing capacity on the isolation transformer for a Starlink, so you can put the $$$ into kV of isolation rating and surge clamping on both sides. Someone...

Which document is that from?

So, as a meta comment. What OP wants is basically community scale microgrid. That's outside the expertise of the contributors to this forum. 99% of the equipment and knowledge discussed here isn't for that case In that kind of utility-scale domain, grid forming inverters means something very...

OK. I’m curious as to whether it is recommended to solder on sensor and balancer leads on top of that. Or cut the existing sensor/balancer wires and splice them into new BMS.

Wot? Well you could propose striped variant of red/black