diy solar

diy solar

Sunny island 6048

Look for a PF corrected inverter heatpump. I think those are more common in Europe, less common in U.S.

Don't know how your microinverters will react, but my Sunnyboys get upset seeing the line voltage quality when operating in island mode with a 2 HP VFD operating. (cheap VFD, diode/rectifier front end with no PF correction.)
 
This gives me an idea to try next summer, if I still have issues with stability of the AC1 side from SunnyIslands, when all my micros are cranking and mostly running the old PSC motor A/C unit. The theory is that the microinverters anti-islanding detection is too much or too hard for the SIs to maintain a fixed frequency, and it oscillates +- a couple Hz around 60Hz. I have not tried telling it to be in generator mode and close the relay (and separately disconnect the grid from there, manually. danger will robinson), maybe then it would be stable. Thanks again for another good idea madsci. However, I'm currently replacing that old A/C with an inverter heatpump, which I hope will also prevent the issue from occuring.
Don't have microinverters, but my 4 ton with the original hard starter caused lights to flicker and UPS to trip when the SMAs were off grid.. I changed the compressor hard starter out for a soft starter and that improved things alot. Then i replaced it all together for an inverter heat pump and the thing ramps up in power over like 3 minutes, so yeah its butter on the inverters.
 
I visited the site again today and determined that the shunt wires were not reversed.

Good news is that I followed the procedure in the manual for calibrating the current sensor and after that I started getting negative amp readings when solar was producing power from the totbatcur meter- finally. Negative amps in the totbatcur meter means batteries are charging.

It was near the end of the day but I actually saw my soc on the si5048 go up a bit from the solar inputs.

Seems encouraging - re running the current sensor calibration may have solved this.

I am sure some more fine tuning is needed for voltages etc and that’s the next step

Some serious engineering in these si units especially considering this unit is from 2006
 
Hi @madsci1016 please update here about your system, does today still run well using Venus OS?
Thanks.
It's not currently working with Venus os. A lot of the files the installer wants to download to install the program are no longer available


Install SMA Sunny Island driver (w/ virtual BMS) on Venus OS at your own risk?
[Y to proceed] y
Install dependencies (pip and python libs)?
[Y to proceed] y
==== Download and install dependencies ====
Downloading https://updates.victronenergy.com/feeds/venus/release/packages/rocko /all/Packages.gz.
Downloading https://updates.victronenergy.com/feeds/venus/release/packages/rocko /cortexa7hf-neon-vfpv4/Packages.gz.
Downloading https://updates.victronenergy.com/feeds/venus/release/packages/rocko /raspberrypi2/Packages.gz.
Collected errors:
* opkg_download_backend: Failed to download https://updates.victronenergy.com/f eeds/venus/release/packages/rocko/all/Packages.gz, wget returned 8.
* opkg_download_backend: Failed to download https://updates.victronenergy.com/f eeds/venus/release/packages/rocko/cortexa7hf-neon-vfpv4/Packages.gz, wget return ed 8.
* opkg_download_backend: Failed to download https://updates.victronenergy.com/f eeds/venus/release/packages/rocko/raspberrypi2/Packages.gz, wget returned 8.
Collected errors:
* opkg_prepare_url_for_install: Couldn't find anything to satisfy 'python-misc' .
Collected errors:
* opkg_prepare_url_for_install: Couldn't find anything to satisfy 'gcc'.
--2023-12-18 04:38:24-- https://bootstrap.pypa.io/2.7/get-pip.py
Resolving bootstrap.pypa.io... 146.75.104.175, 2a04:4e42:8a::175
Connecting to bootstrap.pypa.io|146.75.104.175|:443... connected.
HTTP request sent, awaiting response... 404 Not Found
2023-12-18 04:38:25 ERROR 404: Not Found.

python: can't open file 'get-pip.py': [Errno 2] No such file or directory
rm: can't remove 'get-pip.py': No such file or directory
./install.sh: line 42: pip: command not found
./install.sh: line 43: pip: command not found
./install.sh: line 44: pip: command not found

==== Download driver and library ====
--2023-12-18 04:38:25-- https://github.com/madsci1016/SMAVenusDriver/archive/ma ster.zip
Resolving github.com... 140.82.114.3
Connecting to github.com|140.82.114.3|:443... connected.
HTTP request sent, awaiting response... 302 Found
Location: https://codeload.github.com/madsci1016/SMAVenusDriver/zip/refs/heads/m aster [following]
--2023-12-18 04:38:26-- https://codeload.github.com/madsci1016/SMAVenusDriver/z ip/refs/heads/master
Resolving codeload.github.com... 140.82.114.10
Connecting to codeload.github.com|140.82.114.10|:443... connected.
HTTP request sent, awaiting response... 200 OK
Length: unspecified [application/zip]
Saving to: ‘master.zip’

master.zip [ <=> ] 38.48K --.-KB/s in 0.09s

2023-12-18 04:38:26 (425 KB/s) - ‘master.zip’ saved [39408
 
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