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I figured it out. Watched the inverter during the initial start up from the panel (cold boot from DC power increase.). Threw code 514 for a few minutes. 514 means com to one of the power stages was not established. The com, I assumed comes through the grey ribbon cable. I turned all power...

Hedges, Thank you for your information-filled reply! Agree with the inrush assessment and the voltage droop as the likely cause. The AC and PV systems are connected to the same 200 Amp service through individual breakers. Wires are independently routed (insignificant chance for conducted...

My system is all grid tied. No batteries. Yes there is a 5 minute timer as a part of the thermostat setting. I believe I had an end of life compressor and is what drawing high amperage during start up. I am not having the issue now that the AC is not on. (the other still has minor spike but...

Thank you for the reply. I was able to find a refurbished Sunpower (Fronius) 10 Kw inverter that fits the bill! PV-On!!

Hedges, Reviewed the wiring and jumpers (Used for voltage correction). All looks correct per the manual. I did notice that the measured input voltages are 121.5 and 121.3 but the display reads 118 and 121. Wondering if the voltage sense circuit on the inverter board has gone/is going bad...

I will review the 277 VAC aspect tomorrow!! Great thought! One other weird aspect. I have Sunpower panels with a Positive ground. I don't believe that to be an issue since the DC is rectified to AC before is passes on to the grid. I also agree on catching the spike. Need a trigger scope...

I was very hopeful on the 277 also. :( Thanks for the good info. I have read that the transformer-less could be used on the Sunpower panels, perhaps with some performance loss.(?) Any thoughts on moving the breaker closer to the panel input? Not sure there is a lot of damage going on with...

I am working to solve this same issue. I have found used Fronius (SPR) units that are explicitly compatible but have not found any that stated that on the transformer-less units. What Tfrmr-less unit did you find compatible? Thanks !

The saga continues . . . Measured: L1 - N - 121.44 Vac (Operational) L2 - N - 121.47 Vac (Operational) Inverter display: L1 = 120 L2 = 123 240 Grid identified DC = 350, (353 measured) L1 - N min capture (when goes off line) - Working to capture the low voltage as I write. Will update when...

I have installed "Soft Start" kits on each AC. It has certainly cut down the spike (initially 14000 watts). I also agree the Sense may not capture the full spike but certainly identifies the AC start inrush current as the trigger. I will look at these 2 brands. Thank you!

This is very helpful. I will tackle this on Monday and Tuesday and get back to you. I am sure the peak low voltage is not captured. I do have a Newport TruRMS Supermeter that can capture the min. Will need to hook up and see if I can catch it. The auto shutoff will need to be disabled :) I...

. . . . And now for the rest of the story . . . . About a week ago, one of my AC's died (15 years old). Sprung a leak in the condenser coils . . . Guess what, all good since then . . . New one on it's way. Suspecting a struggling old compressor and slow lack of coolant may have been the...

Recently installed the subject Inverter with a 9 Kw Sunpower solar panel array. Making power just fine until appx 6700 watts achieved and then limited. Suspecting the third stage of the unit has failed and I can see that there is a red led on (See photo - Just above the green LED). No fault...

Delmar, I am currently seeing about 15 minutes of rest between end of a cooling cycle and beginning of the next cycle. Temperatures are about 100 - 105 this time of year. How much time would you expect? Hedges, Well here are the results . . . 1) Will try to capture the Hi/Low voltage with a...

9.02 Kw on grid system with SMA SB8000 inverter - I have recently experienced an Inverter reset issue when my Air Conditioning unit starts (See figure). I have a SENSE monitoring on the PV and load side and can see a power demand spike coincident with the inverter reset. Estimated draw of the...