Which PV Power is needed? MPPT-Power or AC-Output Power? | Home Assistant | Page 1

south vapor Dec 11, 2025, 4:24 PM

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I'm a little confused right now about which sensors I need for the energy dashboard... especially when it comes to my PV system.

PV input power from the MPPT tracker (as the direct output of the modules) or
AC power from the inverter output?
So far, I have been using the direct energy because the inverter itself also consumes approx. 160W and can also charge the battery, for example. Or it discharges electricity from the battery and feeds it back into the house network.

I have a hybrid inverter with homemade battery packs.
I also have the values for charged and discharged energy, as well as the current power (charging/discharging).

Can you help me?

Translated with DeepL.com (free version)

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The HA website metions Shelly EM, so i guess AC power?

timber sequoia Dec 11, 2025, 5:04 PM

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The DC Power doesn't help you a whole lot as you would need to manually remove the conversion losses (and theoretically power factor corrections)

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Unless you do DC to DC charging, then this gets a bit more complicated

south vapor Dec 11, 2025, 6:28 PM

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PV Modules -> Hybrid Inverter

Hybrid Inverter <- Charge / Discharge -> Batteries

Hybrid Inverter <--- AC Ouput / AC Input (when AC-Charging at night in winter) --> House/Grid

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The battery is charged by solar power on dc side. At night over ac, too, in winter times.

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I think a hybrid-inverter is pretty common in these days, isn't it ?

timber sequoia Dec 11, 2025, 6:31 PM

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They come with the downside of not really creating differentiable reportings

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Your ac discharge is both solar and battery while your battery in is dc

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You probably can do templating to resolve this to sensible values but it may get tricky to be accurate.

solar out should be ac out or dc in * ac efficiency, whichever is smaller; battery out should be the difference between those two; at least if we assume you do surplus charging and not additionally ac charging or similar

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From the output pov, only AC is important to your consumption

south vapor Dec 12, 2025, 11:45 AM

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any idea why this is split apart? @timber sequoia

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the order of the second column is also weird

timber sequoia Dec 12, 2025, 11:48 AM

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usually because your data is inconsistent

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your inputs dont match your devices reportings

south vapor Dec 12, 2025, 11:54 AM

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thx i will investigate

onyx hedge Dec 20, 2025, 6:22 PM

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timber sequoia The DC Power doesn't help you a whole lot as you would need to manually remove t...

I actually do that myself and have it as a helper

#Which PV Power is needed? MPPT-Power or AC-Output Power?