Interesting. Do you have one of those units that can operate without battery?This is how my MPP solar units work
Interesting. Do you have one of those units that can operate without battery?This is how my MPP solar units work
Cheap HF inverters have trouble switching between charging battery and supplying AC output from inverter. They need about 30-100 msecs to make the switchover which results in inverter dropping out for that time period.
Exactly how my MPPSolar PIP3048LV-MK units work.The unit can charge when in AC bypass but the user has it set for no charge. Battery low voltage set point is reached. The unit engages a minimal charge current. It does not require a massive rethinking of AIO design. It is simply a programing change.
NoInteresting. Do you have one of those units that can operate without battery?
Seeing your model in your Signature I looked up the operations manual. It does not mention that it can maintain battery when charging is set to PV only. I would think that would be a important piece of information.
@RCinFLAThe inverter should shut down when it reaches low battery cutoff. It will still draw some power to run microcontroller and display but it should be a small amount of power.
When AC input is present, cheap AIO HF inverters can do slightly different things depending on particular model and user settings. Cheap HF inverters have trouble switching between charging battery and supplying AC output from inverter. They need about 30-100 msecs to make the switchover which results in inverter dropping out for that time period.
On cheap HF inverters, when AC input is present, the AC input is just passed through to AC output and inverter circuitry is locked into battery charging mode tapping power from AC input. If solar is present, and depending on user setup priority, the PV power goes to supplementing AC output and/or battery charging.
Some really cheap AIO inverters have to dedicate the AC output PWM sinewave generation circuitry to either charging battery or supplementing AC output from solar power when AC input is present. You can have PV supply one or the other but not battery charging and AC output supplementing at the same time. This is because it uses the AC output PWM H-bridge to regulate charging preventing its uses for sinewave output generation to supplement AC output from PV power. Units that allow simultaneous charging and AC output supplementing have an extra buck switcher IGBT or MOSFET switcher and diode in the battery to HV DC converter path. This is the more common configuration.
Just about all hybrid inverters these days have a small AC input power supply that will power the microcontroller and display from AC input if present, otherwise power is supplied from battery or PV power. Since PV controller takes some overhead power, it comes from battery source so if low battery is tripped it may also shut down PV controller. This is a 'catch22' as battery is low on charge, PV power is available to provide charging, but because of low battery it does not allow PV controller to operate.
Some models will run PV charge controller from PV power if there is enough PV power available. This is a little trickier for PV charge controller as it may get stuck in a startup-shutdown recycling when available PV power is marginal.
View attachment 122330
It is all the drivers (not shown in diagram) for power MOSFET's and IGBT's input gates switching at 20 kHz to 35 kHz rate, their body diodes reverse recovery switching loss, and PWM L-C filtering reactive current loss through sinewave H-bridge.So what in in this diagram under this configuration is pulling 1.5A or 70Watts.
@RCinFLA @Mattb4
Thank you for all your patience and support.
But even after reading and reflecting all your posts, I must admit that things get clear for me only at the surface but it is still not 100% clear for me where those 70W or 1.5A idle current occure in my exact usecase.
So please allow me to dig a little bit deeper.
I adapted the Diagram to represent this exact use-case.
View attachment 122457
There is no PV. It's night! So let's keep it out of the game.
The AIO-Inverter triggered "Back to Utility" and "Low Voltage Cuttoff".
So AC-In Relay should be closed =>Load gets supplied from ACin.
Chgr Buck Switcher is open => So there should be no connection from Inverter to Battery.
So what in in this diagram under this configuration is pulling 1.5A or 70Watts.
I learned from you that in these AIO-systems Display and Controller are running on DC.
It can't be the display, this pulls maximum single digit Watts.
Is this really then the controller? But where is it connected if we would add it to the Diagram?
No, you don't have the settings set correctly.Nope on SUB mode inverter use 100W from grid its not good.
On SBU mode inverter is working on battery but cutoff low dc should charge inverter as well from grid, right now inverter use all power from battery until battery are flat.
Its a firmware bug or what?
No, you don't have the settings set correctly.
User error.