Why can't I use my solar system during a grid failure?

[solardreamer]

I would like to know a little more about "anti-islanding". I have two SunnyBoy inverters that I have set up for SPS power. SunSpecs module will not support this.
Reading Grid Emulation documents, leads one to believe if there is a stable (.5-1hz) frequency for 5 min, the grid tie inverter will operate in a non-grid tied mode. I have not tested this.
This thread is good reading material.
Best Regards

You can activate UL compliant grid-tied inverters with a grid-forming inverter which is an inverter that can independently produce a clean sine wave voltage waveform with stable frequency in the 60+/-0.5Hz range. However, the challenge, as mentioned in my previous posts, is to maintain stable operation under varying load and solar power conditions to prevent overloading or damaging backfeed to the grid-forming inverter.


Modern grid-tied inverters inject periodic perturbations (e.g. small frequency or phase changes) to see how the grid-forming inverter reacts. If the grid-forming inverter has enough inertia then the voltage waveform would remain within specs (e.g. frequency, magnitude, harmonics, etc.). Any out of spec condition that lasts long enough could trigger shutoff (i.e. anti-islanding).

[nerdralph]

A grid tied pv system will shut down anytime the grid is down. The reason is too keep someone from feeding power back onto the grid and not electrocute them.

All standard grid tie inverters are designed this way. I hybrid inverter can switch over to charging a battery system but they cost a lot more than the standard inverter.

Technically it's not the cost of the hybrid inverter that is the issue, it's the batteries. I actually pay a bit less for a Growatt 6000TL hybrid inverter than I pay for a Solis 1P6K inverter.

https://www.growatt-america.com/show-9-634.html

[SunEagle]

Technically it's not the cost of the hybrid inverter that is the issue, it's the batteries. I actually pay a bit less for a Growatt 6000TL hybrid inverter than I pay for a Solis 1P6K inverter.

https://www.growatt-america.com/show-9-634.html

Unfortunately I don't know of any solution other then to get some batteries if you need power when the grid is down and you want to use your solar panels.

For me if it was important I would install a generator and large fuel supply.