So, I got a fantastic deal on a bunch of the now bankrupt tenK Solar's equipment. The problem is all they could get me was 277v (650watt) microinverters for the (200 half cell) 500W Panels tenK solar produced.
I did a test with a buck boost transformer to get 272v volts from 240v with 6 panels & 6 microinverters and the inverters seemed to work ok. So I took the leap and installed a 12KW system at my house (24 microinverters/panels) along with (4x) .5KVA buck boost transformers.
1 - buck boost transformer per 6 inverters - feed from/to a 20amp double pole breaker (grid tie in) -4x
The system does work, but there is something definitely wrong with the microinverters in this configuration - They are very loudly chirping with a high frequency static with not much load and the chirping gets louder and louder on a sunny day till the inverters reset and throw a "AC fast over current" flash code.
I put some inline volt meters on the system and the 240v bounces around quite a bit from 238-252v depending on the output from the inverters -@252v - boosted to 284v the inverters sound like they are going to explode.
If I shut down 3 of the 4 buck boost (just have 1 running with 6 inverters) the voltage remains constant and inverters are relatively quiet.
The 277 inverters have a black, pink, and green wire -normally the entire 277v would be on the black and the pink as the neutral. The buck boost needs 2 hot legs to get 277. One just passes through @ 120v, the other is boosted 32v to 152v = 272v..
I tried boosting both ways the black and then the pink wire and it made no difference.
Buck Boost - 500sv46b - boost house voltage 32v
Lead Solar - LS650-277 Inverters (246v-303v working range)
Apex 500W Panels
Am I missing some logical reason using multiple buck boost transformers on voltage varying inverters wont work? Any ideas for using voltage regulators or anything else?
I'll try anything at this point. Thanks
I did a test with a buck boost transformer to get 272v volts from 240v with 6 panels & 6 microinverters and the inverters seemed to work ok. So I took the leap and installed a 12KW system at my house (24 microinverters/panels) along with (4x) .5KVA buck boost transformers.
1 - buck boost transformer per 6 inverters - feed from/to a 20amp double pole breaker (grid tie in) -4x
The system does work, but there is something definitely wrong with the microinverters in this configuration - They are very loudly chirping with a high frequency static with not much load and the chirping gets louder and louder on a sunny day till the inverters reset and throw a "AC fast over current" flash code.
I put some inline volt meters on the system and the 240v bounces around quite a bit from 238-252v depending on the output from the inverters -@252v - boosted to 284v the inverters sound like they are going to explode.
If I shut down 3 of the 4 buck boost (just have 1 running with 6 inverters) the voltage remains constant and inverters are relatively quiet.
The 277 inverters have a black, pink, and green wire -normally the entire 277v would be on the black and the pink as the neutral. The buck boost needs 2 hot legs to get 277. One just passes through @ 120v, the other is boosted 32v to 152v = 272v..
I tried boosting both ways the black and then the pink wire and it made no difference.
Buck Boost - 500sv46b - boost house voltage 32v
Lead Solar - LS650-277 Inverters (246v-303v working range)
Apex 500W Panels
Am I missing some logical reason using multiple buck boost transformers on voltage varying inverters wont work? Any ideas for using voltage regulators or anything else?
I'll try anything at this point. Thanks
Comment