2nd hand market for Victron MP2 48/3000/35-32

Inverters
21

Again, don’t confuse on-grid vs islanded. When connected to the grid, it will only ever work at 80% of the nameplate rating, and as long as you have sufficient cooling it can do that all day, every day, no problems.

When islanded, if you run it at 100% (of the nameplate rating), at 25°C or higher, it will overheat eventually, and shut down with a temperature alarm. If ambient temperature is low, you can get away with it longer. Below freezing, you can go indefinitely.

The cooling is designed for 80% continuous. The reasoning is that you design an off-grid system (which is 80%+ of the market) to cover peak loads, and the average loads are much lower. You don’t run at 100% for hours on end in such systems. Also, naturally there is some marketing involved, with some manufacturers taking even bigger liberties. Short answer: The nameplate rating is more of a peak rating. It is marketing.

With insufficient cooling, or at high ambient temperatures, the Multi will derate even further (to 60%). But it won’t overload, it will simply feed in less to the grid. And if this happens, you need to fix your cooling :slight_smile:

1 Like
22

that was more a comment that you might recall we’ve spoken about the overload alarms before, agree if you got notifications for every system you touch you might have left the rails long ago…
:wink:
G

23

I see - that’s the confusing part. The nameplate says 5000VA, but the spec says 4000W.
image

So 80% of which is it?

I know it’s possible to draw 5000VA and 4000W at the same time, but in my experience when my loads are that high, the power factor is very close to 1.

But does that mean that a 5000VA multiplus can only do 3200W when grid tied?

24

80% of the number printed on the front. 0.8 * 5000 = 4000W, and that is what it will do grid-tied.

25

That is what it will do IF Grid Tied ( :wink: ) - and no derating

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26

Hi @georgelza and @plonkster and @JacoDeJongh … I think I bought my MPII 3kVA more or less the same time than you George. I am sitting in exactly the same situation. If I would want to parallel, I will need to put in busbars. That in its own will add at least R2000 to the expense. Hence I am considering either getting my geyser off of the inverter or getting a MPII 5kVA. Hoping that it will be a swop out swop in situation. Selling the MP2 3kVA will undoubtedly lessen the blow of the outlay for the new MPII 5kVA. Again a good reason to buy Victron… you will be able to resell it.

Must say I was nogals surprised to see the new (to my knowledge) 8kVA and 10kVA on the market.

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27

I’m at that point now if the tenants move it … what is the best move?
More inverters, me, I get a 3kva for the small loads, the 5kva for the big loads like geysers, both running carefully off the same bank AND I have a backup in case of drama.
Or get EV tubes again?
Or Heatpump, sommer 2nd hand, insurance can maybe help if it fails one day.

But dang … everything costs 10’s of thousands.

… Solis for the geysers …

Sigh.

1 Like
28

I must admit… I was scared to go the Solis route since it was a new concept to me and I like the simplicity of the current setup. I did install a Solis for my parents though… What a beast… My parents do not get load shed (so far) and hence it was just to more or less reduce electricity usage… worked like a charm.

Solis for the geysers would be an excellent motto.