Chinese 300w MPPT Grid-Tie inverter

Xringer · 02-16-10, 11:42 AM

Here's the high lights of UL-1741
UL 1741 highlights

Anti-Islanding test is an important part of the testing, but most UL testing includes
fire prevention factors & and anti-electrocution as the main thrust of the testing.
At least it was that way when I was getting FCC & UL testing done for NEC printers and PCs.

The risk of 'electrocuting a lineman' down the road is always going to be a problem.
If it's not part of their training to double check lines (for back-feed) before working on them, it should be.

Anytime you have a storm with lightning, there is a chance that a grid tied inverter might get damaged.
If it's not 100% fail-safe with redundant back-up/continuous self-testing, it just might keep putting killer AC out to the grid...

Touching 'dead' lines after a storm is like flying in a helicopter..
You have to really trust complicated machinery..

~~~
I wonder what happens when you have a few grid-tied systems on the same short street..?.
It seems all it would take is some downed lines, and a single malfunction to keep all the grid-tied systems on-line...
It seems like they would feed each other..
Tricking the systems into thinking the grid was still connected..

Or, maybe some goofball with a 6kw gas gen connected to the grid??
That might keep those Enphase homes making juice..?.

02-16-10, 11:42 AM	#11
Xringer Lex Parsimoniae Join Date: Feb 2009 Location: Woburn, MA Posts: 4,918 Thanks: 114 Thanked 250 Times in 230 Posts	Here's the high lights of UL-1741 UL 1741 highlights Anti-Islanding test is an important part of the testing, but most UL testing includes fire prevention factors & and anti-electrocution as the main thrust of the testing. At least it was that way when I was getting FCC & UL testing done for NEC printers and PCs. The risk of 'electrocuting a lineman' down the road is always going to be a problem. If it's not part of their training to double check lines (for back-feed) before working on them, it should be. Anytime you have a storm with lightning, there is a chance that a grid tied inverter might get damaged. If it's not 100% fail-safe with redundant back-up/continuous self-testing, it just might keep putting killer AC out to the grid... Touching 'dead' lines after a storm is like flying in a helicopter.. You have to really trust complicated machinery.. ~~~ I wonder what happens when you have a few grid-tied systems on the same short street..?. It seems all it would take is some downed lines, and a single malfunction to keep all the grid-tied systems on-line... It seems like they would feed each other.. Tricking the systems into thinking the grid was still connected.. Or, maybe some goofball with a 6kw gas gen connected to the grid?? That might keep those Enphase homes making juice..?. Last edited by Xringer; 02-16-10 at 11:51 AM.. Reason: crazy idea..