Ok so what is that 5305 then? That’s usually the kWh value. Right?
About the warranty. You’ll need the invoice on your name,
No… That’s W, not kWh. As I said the inverter is brand new, only used it a couple of times to (dis)charge a 7.68kWh battery. I can’t send it back to NKON cause I first bought the inverter, then found out I needed a Cerbo for it, had to wait for that, then needed the MK3-USB adapter to install the ESS assistant, had to wait for that so it’s over 14 days now. But it’s ok, I’ll just get me a RS6000 next time, hopefully it’ll perform better.
Just noticed this MP2 is drawing 140W when idling, crazy stuff, so it’s consuming around 2.8kWh daily doing absolutely nothing. Terrible. I can put a relay there but seriously Victron…
To: @castleneva
I read almost everything, don’t be fooled.
Let’s sum up this absolutely useless emotional thread. You made a purchase of components without having the necessary professional knowledge and knowledge of the entire line of company products. Instead of studying the entire ecosystem before buying and choosing the kit that meets your technical conditions and tasks, you throw tantrums.
There is a relatively comfortable atmosphere in the community, many professionals, and most importantly, there is qualified personnel of the manufacturer who are able to answer various questions, if they are formulated correctly and are respectful to other community members.
I strongly recommend that you start with the main thing:
- Study the specifications of the products you have;
- Carefully read the manual & additional documentation for each product you purchased;
- Related sections and the company’s knowledge base (it is publicly available);
- Adjust your behavior and form of communication;
- Then start communicating with community members and ask correct questions if you have any.
Keep your emotions about your incompetence to yourself, otherwise you will end up under a spoiler for many people.
Good luck.
Haha. Ah ok. Oops. Anyway. With that cleared up. You don’t need the MK III to setup the assistant. Also. Look at my image/values. Silent (no humming noise) lighter, more efficient, but like I said. More expensive.
May I ask where you are located? North, south, east, west or middle. I might be able to help you out.
161.6kWh charge 158 discharge on your home system? That’s very impressive and hard to believe… Did you measure this on DC or AC side? What battery do you have?
I have HomeWizard kWh and energy meters on just about everything so yeah that is on the AC side of things. Like I said. The RS6000 is way more efficient, and that’s with EVE MB31 cells and JKBMS. Getting only like 6kWh max a month from the grid. And for months already.
At home we have two Growatt inverters and Enphase setups running. And when I say just about everything I mean: fridge, freezer, dishwasher, washer, dryer, espresso machine, microwave, kettle, heat pump, two airco’s, mechanical ventilation, tv cabinet, Unify routers and camera’s, switches, airfryer, instant pots, oven,induction cooktop, you name it.
Will definitely try the RS6000 for my next battery, thanks. Planning on an eventual 75kWh capacity, 25kVA grid connection, 3*5kW Growatts for solar. Not even going to bother covering my own consumption, just dumping it all in the grid when prices are high. All fully automated with measurements from the utility meter and hourly epex prices. Should pay for itself in about 3 years, not counting the MP2 ofc.
Do you have DC kWh measurement as well? Should really get an idea of the efficiency of this cheap Chinese battery I’m using now before I (don’t) order another one.
Of course. SmartShunt data (Advanced → SmartShunt - Battery History):
Note: my latest new battery pack in test setup.
OK, my 2p experience:
Yes, MP2 is not the most efficient unit. I can live with this, since the sun is for free (my case, panels). Having a DC 48V bus (LV battery) might be safe, not compex, ubiquitus, but the conversion 48Vdc to 230Vac never can be comparable in efficiency to string inverters (PV to grid). Though, please pay attention to the following:
- Victron MP2 does not report precicely the load watts, especially for low values (so this 104W above could be well under 70-80W)
- The DC battery load, if BMS is mastering, is what the (cn) battery reports.
So, as others said, you need to have proper instruments, true RMS, to make a verdict. I have not done it, but I would not be surprised with a discharge efficiency <90% and round trip <80%, depending on the load curve.
(that said, as an electronic engineer, do not clearly understand why higher temp lowers the efficiency - except for fans kicking-in)
Now, if you allow me to hijack a little this topic, starting from @UpCycleElectric ideas:
I was having similar thoughts. Since the MP2 is limited in power output, if you want, on top of normal house load, power some new hog (say charging a micro-EV 2-3kW, domestic hot water boiler 2kW, a new A/C unit 1.5kW etc), which is more or less “continuous” load (i.e. will draw power for some hours - not like a kettle, or cooker etc), then, this load “clogs” the MP2, you are not left with any juice (especially if you are off-grid).
Now suppose that your battery can support those kW, and/or you have enough PV DC power coming in. The solution would be to add another (Victron) inverter, for that load (EV charger etc).
So, my idea is this: 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. I guess OBC of an EV will boost to car’s HV battery. A DC inverter A/C has also a similar smps. So, wouldn’t be more efficient to have a boost converter, of high(er) efficiency, to feed a DC voltage (from 48V to) 320V to the smps of the device (making also its life easier, as it has no hard job to do, to track the 100Hz ripple on the normally rectified AC source)?
Of course, with some experiment (and query to mnfctr), if the device supports powering with HV DC.
Is this an idea to Victron, for an “almost DC house world”?
Don’t want to feel/experience a 320V DC voltage through my body in case of an accident… 
So, as @Diessel says, either you aren’t set up correctly, or you are trolling.
The forum has given you enough leeway to prove the former, but you keep proving the latter.
It was drawing 140W, measured it with the utility meter, but the battery was connected and empty (1%) so it could be that it was temporarily recharging it to maintain voltage. I put a relay on the AC IN to turn it off completely to prevent this. The battery gets recharged daily so that should be ok and it gives me peace of mind.
And @Diessel I have every right and reason to be upset and emotional about an inverter that is advertised as 95% and delivering barely above 80% in real world, just on discharge. The question is why aren’t you, and the answer is you’re a ‘qualified professional’ more interested into getting into your customer’s pockets than efficiency. I get that, I really do, but this is my home setup and I’m one of those users who needs efficient inverters, and stay far away from ‘qualified professionals’ aka parasites.
That said, I do see and agree this is an active forum with many people having electrical and electronics backgrounds. I appreciate all the feedback and suggestions, except yours Diessel, and I’ll apologize, sincerely, if I came on rude to anyone especially Nick. Sorry.
You could simply install a 3 phase rectifier for your DC home, but ofc if the wife or anyone connects an inductive load expect fireworks. It’s interesting though, did you know people living close to HV AC distribution have a higher risk of cancer, and if you do the calculations the max distance for this effect is where the 50Hz radiation is similar to what can be expected from a regular 230V AC powered house.
Don’t want to put gas on fire, but on official documentation it says “Maximum efficiency 95%”.
By that maximum, I, for one, understand that only in certain (ideal) conditions will get to 95%.
In all others, that efficiency could be (and is) lower.
You presented in the first post a particular case where you are using about (if not) the maximum power the MP2 5000 is capable to deliver…
Take a look at this: Multiplus-II 48/5000 efficiency curve - VictronEnergy
Also take into consideration that a grid injection could be subject of rapid power variations and the Cerbo is not always capable of showing you the instantaneous power. You should observe the injection power for a longer period of time and get from there the maximum value and that should be considered when you are computing the efficiency.
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After these words, in principle there is no significance in reading what you write. But I’ll continue anyway, as I already said - I read everything.
If you are prepared to have a thorough discussion and have the relevant knowledge, measuring equipment and understanding of how are made transparent measurements, I am ready to discuss and compare.
Here you make another mistake by putting words in quotation marks.
I’m a person with two university degrees. I’ll tell you more, I can afford to choose my projects and clients & not one of those who are ready to do anything for the sake of profit.
In defense of Victron, so to speak, personal opinion.
Today, in the LV segment, few can compare with their products.
To understand this, knowledge and experience are needed.
In conclusion, From Me & on behalf of colleagues, as you put it “aka parasites”, I wish you success and safety.
P.S. Also don’t forget about fire extinguishers! But only CO₂!
Congratulations, but then you’re either being dishonest or you weren’t paying attention in power electronics class. An inverter with 81.5% efficiency is underperforming and just bad design. There should be laws and regulations against these wasteful devices, wonder what Greta would have to say about it. I also hold 2 masters btw, so at least we have that in common, one in electronics engineering and another in AI.
Look at my charge results of just now, perfectly fine and acceptable. 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…
Kidding… Peace men! 
1 Like
He doesn’t understand the difference between the laboratory measurements of all manufacturers and reality.
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 some agreement.