The cause of data gaps in CSV files

 

There have been occasions when data gaps occurred in the CSV files collected daily.

The problems are unique to the power file. The azimuth and elevation are printed, but nothing else.

Further, that data is collected outside the schedule. Somhow, the NOAA2.py script is being run outside of schedule, and printed to the CSV files. The EpD3Dy.php script is run by a service/timer. The NOAA2.py script ius called from within the php script.

The problem may disappear if the python script is run in a different service/timer pair.

I'm examining an epevermodbus python script to read and record settings separate from the php script. This will allow me to examine the data for problematic results, such as negative values or other data anomolies.

I reset the timer to a time after the sun has risen. Unfortunately resetting the timer startup very season is not practical. I may be able to set the startup time from within the service or the script.

This problem is relatively recent. Perhaps this is a result of the differences between the Epever Tracer and Triron charge controllers.

Autumn change

 

Autumn and the shorter day is coming.

I need to raise the panel array up higher since the sun will not be rising as high in the sky until next Spring.

The best solution would be a concrete base for the bottom, 1/2"+3/8" rebar reinforcemant for the steel axis pipe, a more permanent support for the high end.

I need to get short 'samples' of the rebar to insure the fit before buying the ten foot long pieces.

 

working files and folder structure

 I am making a working set of files and folders available for free.

I've done this before but so much time has passed, and changes made, I need to do this again.

Instead of posting each file on the blog, I'm providing a Dropbox public link.

Files link

Battery bank wiring modification

 

The battery bank has been wired in parallel with system connections at the closest battery. This creates an unbalanced load on the bank. 

The modification: instead of direct wiring to the closest battery, one connection to the closest battery (+) and one connection to the most distant battery (-).

The ideal arrangement would be separate connections to the system for each battery, a radial configuration.

Inverter final test

 

I finished the installation of the replacement lever actuated terminal connector WAGO 2606-1103.

This afternoon, I had occasion to run the inverter/generator. I plugged the unit in while the Xantrex inverter was on. The system was maintained. Notably, the RPPi4 experienced no discontinuities in the data stream.

I count this as a success.

There was a brief  lapse in the lightiing, about 1/3 second, but this was partly due to a setting on the iniverter. The transfer is set up for APL, appliances, but could be set up for sensitive electronics. The second option warns against transfers with inductive loads such as electric motors (water pump, fridge) running.

Power limit discovered

 

I have discovered the reason why my charts never rise above 560W in delivered power in my 1kw system.

My system has 24v panel system and 12v battery system. The charge controller can handle both but the inverter only takes a 12v input.

If I want to get the full 1 kw power delivery, I need to replace the 12v inverter with a 24v inverter. Then the charge controller can run at maximum capabilty. I will be able to charge the 5kw battery bank in 5 hours on a sunny day. Since the bank is never drained completely, the time will be significantly less.

'AC In' connector replacement.

I have received the WAGO 221-412 and 221-2401 connectors in the mail. Those have replaced the wire nuts traditionally used to tie two household grade wires together, typically 12/2.

I have removed the connector sub-pcb and unsoldered and removed the damaged connector using the solder iron, solder, solder sucker and flux paste.The pcb is ready for the new WAGO 2606-1103 connector. I added two push-fin cable strain relief clamps for the AC connections.

I received the new connector a couple of days ago. Preparations included setting up the new soldering iron plus solder, sucker and flux paste. The replacement went smoothly. After the replacement, I re-assembled the unit and removed the 1200W unit. I attached the 2000W unit to the wall after attaching the AC and DC cables.

I started the unit this morning and all is well. 

The final test will be the attachment of a running inverter/generator like the Predator 2000 to test shore power detection and switching.

WAGO 2606-1103 pcb connector for 'AC In'

Before

After

Repaired unit

Wire nut replacements, 'AC In'

Wire nut replacements, 'AC Out'