Hedges
I See Electromagnetic Fields!
- Joined
- Mar 28, 2020
- Messages
- 21,044
I was excited to learn that Sunny Boy SB xxxTL-US-41 operate at 120V.
Sunny Island 6048US is 120V, and SMA hasn't offered 120V Sunny Boy since the SB 700 ... SB 1800. So 2x SI or transformer needed to connect SB.
Then @Solarisium accidentally connected his -41 to 120V from the grid, and it worked!
Earlier model SB could auto-select 120/240V split-phase, 120/208Y, or 277V single phase by voltage and phase between L1, N, L2.
The -41 model does not support 277V. It does have 120V "Secure Power" batteryless backup.
It appears that if -41 is wired they way earlier 277V inverters were wired, it operates at 120V. Still TBD if it does frequency-watts, needed for well-behaved AC coupled off-grid or backup system.
I've since picked up an SB xxxTL-US-41 and an SB XXXTL-US-22. Both operate on-grid at 240V.
I tried to do 120V by tying N to either of L1 or L2. SB -41 just blinks on and off with either connection. SB -22 reported grid fault in one configuration, waiting or voltage in other.
@Solarisium, how did you connect L1/N/L2? I can't seem to reproduce your results.
I'm now thinking I'm supposed to float N, not connect it.
no? RTFM usually works. It (manual for SB xxxxUS) says to connect N but not L2.
I've now tried almost everything.
Anybody got other ideas??
Sunny Island 6048US is 120V, and SMA hasn't offered 120V Sunny Boy since the SB 700 ... SB 1800. So 2x SI or transformer needed to connect SB.
Then @Solarisium accidentally connected his -41 to 120V from the grid, and it worked!
4kw system outputting 2.5kw. Why?
Issue: VMP voltage is low. System: Grid tied single string using Sunny Boy 3.8kw us-41 inverter. Designed and installed diy. Finishing final steps before requesting inspection. Location: Southern California 9 Solarever panels, each at 455w. Connected in series with APSMART single rapid...
diysolarforum.com
Earlier model SB could auto-select 120/240V split-phase, 120/208Y, or 277V single phase by voltage and phase between L1, N, L2.
The -41 model does not support 277V. It does have 120V "Secure Power" batteryless backup.
It appears that if -41 is wired they way earlier 277V inverters were wired, it operates at 120V. Still TBD if it does frequency-watts, needed for well-behaved AC coupled off-grid or backup system.
I've since picked up an SB xxxTL-US-41 and an SB XXXTL-US-22. Both operate on-grid at 240V.
SPS Secure Power Supply in SMA Sunny Boy inverters
SMA Sunny Boy inverters SB7.7-1SP-US40 and SB6.0-1SP-US41 have a "Secure Power Supply" (SPS) component, which can be wired to a separate SPS outlet. It can provide up to 2kW of 120V AC power in SPS mode in case of a grid failure. In such a case, it must be manually activated via an SPS switch...
diysolarforum.com
I tried to do 120V by tying N to either of L1 or L2. SB -41 just blinks on and off with either connection. SB -22 reported grid fault in one configuration, waiting or voltage in other.
@Solarisium, how did you connect L1/N/L2? I can't seem to reproduce your results.
I'm now thinking I'm supposed to float N, not connect it.
no? RTFM usually works. It (manual for SB xxxxUS) says to connect N but not L2.
I've now tried almost everything.
Anybody got other ideas??