Anti islanding

[SolTex]

At least one manufacture (that I know of) does have a system that will provide limited backup operation, without batteries, when the grid goes down. There may be others.

https://enphase.com/installers/systems/sunlight-backup

[albert436]

I've got a solar guy coming over here in about an hour and I will try to remember to ask him that is if I can remember the question which is a little over my head . . .

[solardreamer]

A few UL compliant solar inverters can produce power from just solar power but the power is unpredictable and can collapse at anytime from a passing cloud. For stable power a reliable grid quality power source to activate grid-tied soar inverters and a way to absorb or limit excessive power grid tied solar inverters are necessary. There is no inherent reason why the solution requires battery but some kind of stable energy resource is necessary.

[SunEagle]

A few UL compliant solar inverters can produce power from just solar power but the power is unpredictable and can collapse at anytime from a passing cloud. For stable power a reliable grid quality power source to activate grid-tied soar inverters and a way to absorb or limit excessive power grid tied solar inverters are necessary. There is no inherent reason why the solution requires battery but some kind of stable energy resource is necessary.

And before anyone suggests it a generator will not provide that same electrical performance as the grid or battery system so the inverter will not work if you just have a generator.

[Ampster]

And before anyone suggests it a generator will not provide that same electrical performance as the grid or battery system so the inverter will not work if you just have a generator.

This is true based on a Harbor Freight generator which my Nephew purchased. The sine wave is very dirty. However, not all generators are the same. More expensive generators which use inverters for output are reportedly able to produce a cleaner signal. My preference is batteries anyway.

[SunEagle]

This is true based on a Harbor Freight generator which my Nephew purchased. The sine wave is very dirty. However, not all generators are the same. More expensive generators which use inverters for output are reportedly able to produce a cleaner signal. My preference is batteries anyway.

There may be some form of power generation out there that can fool an inverter but as far as I know there isn't any small home sized ones that can do that even if they are inverter type and have a clean wave form. But again solar inverters are being changed and maybe something other then batteries will make them work to their full potential.

[nomadh]

Hi all, I'm just ordering a solar panel/battery system which will be linked to the grid and have become aware of a safety feature called "anti-islanding". As I understand it if the grid goes down then the solar panel/battery system are shut down to prevent electrical current going back into the grid and endangering personnel working on the grid.

The consequence is that should the grid go down you also have no access to your battery or solar panel power.

I'm guessing this is a feature of the inverter and was wondering if there are any available that would isolate you from the grid but not turn off your in house power.

Your system request Make's total sense to me. The fact that no system had that available was the reason I didn't get solar for years. It was luck that sunnyboy had just come out wth an inverter with daytime emergency power just before the ca nem 1 ended.
it's tl us series. I hear they don't allow it in ca now because it has live power on the roof during fire? but i dont know. People here act like this is crazy or a brand new concept or cray dangerous. Mine is very simple I throw a switch to disconnect from the grid and then I can get 15 amps during the day without a battery.

I'm just now catching up on new tech and it looks like the new iq8 enphase had a no battery daytime power option too. Hopefully they allow it in ca.

[nomadh]

A few UL compliant solar inverters can produce power from just solar power but the power is unpredictable and can collapse at anytime from a passing cloud. For stable power a reliable grid quality power source to activate grid-tied soar inverters and a way to absorb or limit excessive power grid tied solar inverters are necessary. There is no inherent reason why the solution requires battery but some kind of stable energy resource is necessary.

Not likely with my sunnyboy. It's a 5kw system but the daytime power is just 1500w. In testing it can put out 400w out of 600 at near dawn and dusk but your right that clouds could knock it out but after it has 2500 watts output it handles the 1500 fine.