I'm working with my dad to install his solar panels at the cabin, and I'm running into a few challenges. We have Hoymiles HM-800NT microinverters, which are showing a red flashing light. Based on the manual, this could be because they're not properly connected to our AC grid. I'm also unsure about the installation: we installed a single HOM240 Square D breaker to manage the power from our main property to a second structure at the back. My questions are: 1) Does this breaker support bidirectional flow so we can use both solar power and power the second structure? 2) If it doesn't, can someone suggest a suitable breaker? 3) If the breaker is the problem, where else do we need to install bidirectional breakers, or do they need to reach all the way to the utility's transformer? Any ideas on why the inverters are blinking red would also be hugely appreciated!
1 Answer
Not all breakers can handle backfeeding, particularly those labeled for line and load, like AFCI or GFI breakers. However, standard Square D Homeline double pole breakers are typically fine for backfeeding. For your second question about the bidirectional breaker, it's crucial that every device is suitable for how you're intending to use them. You'll want to ensure the distribution panels and breakers are all properly rated. As for your inverters showing a red light, make sure you're checking the AC and DC voltage at their inputs. If that's all good, then the issue might be with how the microinverters are reporting. They can be finicky and rely on their internal statuses.
Thanks for the info! I checked, and it seems like all the HOM breakers we have can handle backfeeding. The problem now is getting my Hoymiles app set up since it requires contacting the installer. I'll tackle that when I'm back next week.