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Inverter Maxims


flamegrilled
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Input Side

Max.DC Power(kw)5.3

Max.DC input voltage(V)600  (per string or in total) ?

Start-up voltage(V)120

MPPT voltage range(V)100-500 (per string/per mppt) ?

Max.input current(A)11+11 (in series that's the current panel current) ?

MPPT number/Max input strings number2/2

Output side

Rated output power(KW)4.6

Max. apparent output power(kVA)

5 (4.6 for VDE4105)

Max. output power(kW)

5 (4.6 for VDE4105)

Rated grid voltage(V)230

Grid voltage range(V)160-285

Rated grid frequency(Hz)50/60

Operating phaseSingle

Rated grid output current(A)20

Max.AC output current(A)

23.8 (21.7 for AUS)

What is the maximum input  DC voltage per string for the device ?

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29 minutes ago, flamegrilled said:

Max.DC input voltage(V)600  (per string or in total) ?

Pretty sure it will be per string.

30 minutes ago, flamegrilled said:

Max.input current(A)11+11 (in series that's the current panel current) ?

I think they mean 11A per MPPT, ie the MPPTs are the same size. Yes, I'd think they want your Isc (short circuit) to be below this.

 

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2 hours ago, flamegrilled said:

If the panel rating is (Short Circuit Current (Isc): 9.45A) , would this be too close to the Inverters Max.input current(A)11+11 levels ?

Don't know but I suspect it will be fine.It's 15% below technically speaking. At 1000W/m^2 they will push 9.45A, so naively extrapolating that means you're good up to 1150W/m^2.

Wikipedia says 1361 W/m^2 arrives at the top of the atmosphere, and the maximum on a horizontal surface is apparently 1120W/m^2. And usually such devices can handle overcurrent events and switch off.

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So if 600v DC is maximum for each MPPT, I should stay below (at 550v) for summer radiation when it's at its highest?

So my thoughts would be using a solar tracker for arguments sake, you would also be in trouble and touch the 11A mark.

Edited by flamegrilled
Current levels
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1 hour ago, flamegrilled said:

you would also be in trouble and touch the 11A mark

I don't know. We always say that current is drawn and not pushed. Well that is nonsense in some sense... it is pushed (by the voltage), but I think what people mean is he current cannot flow unless you give it a path by which it can flow, so 11A won't flow unless the MPPT lets it. Just because you have 600A capacity in your car battery, that doesn't flow when you turn on the car radio, but it does flow if you turn the starter switch.

I digress.

Where I am headed with this is that MPPTs generally allow oversizing. The voltage is limited (we know that already), so that must mean that you are allowed to fit more current capability than it was designed for, up to a certain limit usually (my advice is usually 120%).

What I don't know is what these guys mean by saying 11A. Do they allow oversizing? Is that the limit to the oversizing? Or is that the general limit where the device cuts out, so oversizing above 11A is allowed? I do not know.

Looking at the MPPT range, 100V-500V, it means each MPPT can make between 1100W and 5500W at the full current. The total power for the device is 5300W however, so I suspect the max per MPPT would be around 2500W (to make the math easy), which at around 10A (again to make the math easy) means at 250V maximum power is within reach.

I really have a feeling the 11A is the max it will "pass", not the max you have to limit it to. I think they add that because below 250V you're not going to get full power. But it is a guess. Ask the manufacturer?

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