Who the fuck thought it was a good idea to AC-couple solar panels to a home's electrical network?
Why must this asshat make solar telemetry so fucking hard that one cannot discern solar production from grid consumption?
@tomas Any MODBUS-level experience with Darfon inverters by any chance?
@tomas That kind of gets at the root of my issue. I don't know how it's configured internally, but it's clear that you need two inverters (a grid-tie inverter and a battery inverter) instead of just one. It's a more complicated design, with more (metaphorical) moving parts that can go wrong.
For my immediate needs, however, the relationship between battery power, load power, grid import/export power, and ohmic losses isn't clear, and telemetry is producing measurements which make sense.
@vfrmedia @tomas @Edent @OxfordSolarLive I'm aware that Kirchoff's laws that has to apply (ideally, the sum of all power current, and through Ohm's law, power readings must add to zero; if it doesn't, we're seeing either ohmic losses in the system (which should be relatively constant) or ADC noise (which should be insignificant)). But, what I'm seeing is wildly varying and quite significant, a clear violation of Kirchoff's current law.
In recent times I seem to routinely miss out entire words in toots or substitute wrong ones, in spite of being able to see perfectly well enough for the driving licence eyesight assessment a couple of months ago.
Perhaps I should start tooting more in other languages than English, as I seem to pay more attention when doing that 😆
@tomas I'm writing software for a product we're developing. The configuration of the product is already set in stone.
@tomas No; I'm a software engineer, and these systems are already designed, certified, etc. My task is to repair a bug in the telemetry code which works fine for our DC-coupled inverter systems, but not for the AC-coupled. Making HW changes now would require us to spend the time and $ to re-certify, and it wouldn't do much for our existing deployments.
@tomas My measurements show that CTs will only slightly help, but won't cure the bug. Solar production would *still* reported on the essential load reading. :(
True, I can at least separate out load from solar with the existence of CTs; but I still need to maintain two separate patches of code (one for DC and one for AC) to produce the proper telemetry.
This is a bug which is best fixed via a firmware update on Darfon's side.
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