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Limiter inverter with RS485 load setting
#41
To follow up with last night's post- I am really disappointed in this product and I would hesitate to recommend it to anyone. It only works intermittently so I don't think I'll be able to rely on it.

Just to remind you, I have two inverter units and a meter box that is set to "2 Unit". They are connected with a twisted pair of a cat 6 cable that runs from the electricity supply box to my shed. One of the inverter units is daisy chained to the other for RS485 communication.

From last night's idea I attached a small travel router to the back of the meter box to see if I could warm up the unit, in the case that cold weather is affecting the microcontroller inside. I've attached some thermal photos of the before and after but it didn't improve the situation of exporting energy to the grid. There doesn't seem to be a pattern to the oversupply. The system will occasionally follow the rules and then all of a sudden export about 120 to 200 watts more than it needs to.

I've restarted both the units, and the meter box to no avail. I put an RS485 adaptor inline with the wire to sniff for packets and the strange thing is it seems to be missing some data, perhaps someone could try to make sense of it? It might be an issue with my terminal program removing zero value information. I've attached a graph from openCMS showing behaviour.

For the time being I've turned off one of my two units so that the system still generates power, but does so to a level definitely below what is being consumed by the house. I can see see how one of the units "proportionally" generates half the power that it should where it is waiting on the other unit to pick up the slack. 

One possible solution I have is to set the meter to "3 Unit" and let the two inverters share what is being requested by the house. This should mean the two units generate the power that the meter is "telling" three units to do (so two thirds, or slightly more if it goes into over-generation). This may keep me below the level of exporting to the grid but it's a far cry from the solution as it was sold to me.

If anyone had any advice on this it would be greatly appreciated.

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RE: Limiter inverter with RS485 load setting - by Cell-King - 06-19-2020, 03:40 PM

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