Just really disappointed with my multiplusII 5000, it wastes around 21% on discharge/feed-in. [victronsucks] Can someone please tell me why this inverter is wasting so much power on discharge? Can I send it back bc I’m really getting sick of seeing this thing underperform. Please help.

[image] castleneva: Where did they go wrong with the discharge? I’ve tried to suggest an explanation here, in the last paragraph… Disappointed in export efficiency - #56 by alexpescaru Hope that wont get to pictures now that it came to who’s bigger and thicker… :zany_face: Kidding… Peace me…

He doesn’t understand the difference between the laboratory measurements of all manufacturers and reality.

[image] Alex Pescaru: Hope that wont get to pictures now that it came to who’s bigger and thicker… :zany_face: Hahaha Alex, I literally laughed out loud on that one. Btw if you’re still interested in my MP2, let me know what you’re willing to cough up for it and let’s see if we can come to so…

[image] Dimitris: Most of AC 230V of modern loads have a diode bridge, hv capacitor and then the smps takes over the 320Vdc (almost) and converts to whatever is needed Most modern appliances that take an ac power source in both the 110Vac as the 230Vac range would most likely run on DC from a…

I wonder why there are no energy efficiency labels, like on basically every other electronics device on the planet - from a simple light bulb to every kitchen appliance - yet inverters…errr. Nope. Also. It would be nice, and a whole lot more transparent, when inverters also had some sort of effi…

[image] ChiefSolar: It would be nice, and a whole lot more transparent, when inverters also had some sort of efficiency graph. I agree with the idea that it would be valuable to have better access to efficiency specifications. I’m a whole lot less enthusiastic for more government regulations …

[image] Jan: Most modern appliances that take an ac power source in both the 110Vac as the 230Vac range would most likely run on DC from a little above 80V and up. 2 of those rectifying diodes are going to have to work twice as hard though, but it’s probably ok, even desired, if they break do…

Like I said, lowering the grid set point does wonders to efficiency. In my experience the charging efficiency is lower than the discharge efficiency, so do another test when exporting at ~3800W power and see if you get satisfactory efficiency.

With regards to discharge from battery and efficiency, use a node red flow to keep the battery discharge at a constant current (not wattage based or other) so the flow varies the discharge watts based on battery voltage. I have a system (multillus 2) at 96% efficiency doing this on a test bench for…

[image] Jalle19: so do another test when exporting at ~3800W power and see if you get satisfactory efficiency. [image] From just now, so not much improvement. 80-85%. If you have better results I must be doing something wrong, or my specific MP2 is faulty. It’s also weird that it thinks the…

Disappointed in export efficiency

DIY

UpCycleElectric (Jan) 6 July 2025 14:10 64

I agree with the idea that it would be valuable to have better access to efficiency specifications. I’m a whole lot less enthusiastic for more government regulations to make that happen where the market already has a direct incentive to do so itself.

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Disappointed in export efficiency

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