Do you know that the Power Values are showing Wrong in the OpenDTU with a Battery Operation? #1020
Replies: 6 comments 14 replies
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I can not confirm wrong values. |
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Do you use a Battery or PV Operation? |
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I am using OpenDTU with a PV system. |
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Ok, maybe this Error is only exist if using the Hoymiles Inverter with a Battery. |
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Ich nutze einen HM1500+HM600 an 3 Pylontech us2000c+1x us5000c....und läuft m.E. korrekt.
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**Interesting... the other Member from another Forum has three HM-300 with a Original DTU Pro and all have wrong Values in the Open DTU. It should can be that "only" the HM-300 have these Error. Now we need someone with an HM-300 + Battery Operation :). My Cerbo GX tells me the same... 300 Watt from the Batterie but the OpenDTU says only 240 Watt Output.
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Es besteht noch der unterschied, dass ich ein 48v System habe und du ein 24v. Ich habe schon mehrfach gelesen, dass der HM an 24v nicht rund laufen soll. Aber ob das Damit zusammen hängt...? M.e. wird der Wert von der Opendtu ja auch nur vom HM ausgelesen. |
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Bin hier gelandet, weil ich grade festgestellt hab, warum mein Power-Graph so "nevös" ist: Bis/Unter 200W ist alles schön, aber sobald ich den HM-1500 am 49V geladenen Pylontech auf 250W (oder ähnlich über 200W) stelle schwankt er mit jeder Aktualisierung. 180, 222, 189, 193, 252, 193, 176, ... Am Zähler sieht es ähnlich aus, denke nicht, dass der Wert falsch ist, er schwankt nur einfach wie verrückt. |
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Ich habe mal bisschen google bemüht. Das Problem scheint bei mehrere aufzutreten...aber nur am Akku. Würde man das Limit mit SolarPanels reduzieren, tritt das Problem wohl nicht auf. Ich habe bisher aber keine Lösung für das Problem finden können. Ggf. ist das ja ein Spannungsthema....müsste mal jemand mit einem DC-DC Wandler schauen, ob das Problem dann auch auftritt. |
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Oder der MPPT Algo vom HM mischt mit rein, aber warum nur über 200W? |
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Bis 200 alles recht stabil, drüber deutlich unruhiger: |
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Ich habe ein ähnliches Verhalten mit einem HM-600 und auch einer 24V Batterie, ab ca. 400 Watt weichen die Werte von einander ab. Je höher ich die max. leistung erhöhe um so größer sind auch die Differenzen. Komisch ist auch, dass lt. openDTU nicht höher als 485 Watt geht, der eigentlich Output am Shelly ist aber schon bei 650 Watt (was deutlich höher ist wie das was er bringen sollte)
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Yes, thats exact the same Problem just with a Bigger Inverter... and until now it gives no Solution for this Problem. |
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I have the same configuration and the same problem. |
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From my point of view this is less an OpenDTU problem and more a problem with the Hoymiles inverters when operating with a voltage source (battery) for which they are actually not designed. The MPPTs are optimized for operation with PV modules. For example, the internal resistance of the batteries can differ from the internal resistance of the PV modules. From my point of view, this would explain why this "fault" only becomes apparent at higher power levels. |
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Yes, that must be a problem in the Hoymiles inverter - I just wonder why that is... |
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The input battery voltage is for sure a problem, if i run it above 51V everything looks good, if the battery voltage goes below this value the ?MPPT? kicks in and destroys every normal operation. Idk what exactly the problem is, maybe the voltage level but if i run it on a 28V power supply (MW 1kw) it doesn't show this behavior. |
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Maybe it's the voltage drift over time. |
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Bei mir das gleiche Problem mit einem HMS-2000 4T und einer 24V Batterie. Mögliche Lösungen:
Falls jemand noch eine schönere Lösung hat, gerne bescheid sagen. |
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Bei mir läuft ein einzelner HM-300 und ich habe das Problem ;). |
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Hello,
i had a Discussion in a German Forum about the Power Values from the DTU (with a Battery Operation instaed of PV Modules).
One Member has tell me that the Power Values in the OpenDTU are showing wrong inclusive in a Original Hoymiles DTU Pro.
So i have checked that and measure these, and it is exact what he has sayed: the Values are wrong. So the showing Kilowatt Hours are also wrong if you use a Limit higher than 200 Watt.
Here a few Pictures what i could measuring:
Until 200 Watt Power Value all is fine and correct. ..
Already at a 220 Watt Limit you get real 250 Watt Output Power...
And at 240 Watt you have already reached the maximum Power from 300 Watt...
A higher Limit up to 300 Watt or 100% brings no Changes more...
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