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50kW Off-grid inverter


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12 hours ago, Chris Hobson said:

Hi I am looking for specs for a 50kW off-grid inverter. Sukam the Indian Solar manufacturer has one but I was wondering if anyone has come across any other manufacturers producing a big off grid inverter.

I would get multiple units and spread the load.  Having all the eggs in one basket is a risk especially given the scale of the operation.

3x 20kw with multiple banks of batteries.  Maybe even in 2 locations on property for some "insurance" against fire, flood, etc 

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22 minutes ago, Mark said:

I would get multiple units and spread the load.  Having all the eggs in one basket is a risk especially given the scale of the operation.

3x 20kw with multiple banks of batteries.  Maybe even in 2 locations on property for some "insurance" against fire, flood, etc 

We are spreading the risk already 27 pig sheds each with their own 4-5 kW inverter and the balance as 50kW inverters. The bug bear is the client wants the 50kW as hybrid  inverters otherwise I would install grid-ties and be done with it. Mark you looking for a job? We can decentralise it further and give you a 50cc to get between the sheds.:lol:

Part of the job description is to clean/maintain 350kW of panels (glorified window washer).

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at 50 KW you may be better off with HYBRID PV Diesel -

 

If you have not used I highly suggest using homer to do the Sensitivity / LCOE analysis - http://www.homerenergy.com/ - 30 days is evaluation 

 

even SMA has nice calculator with only their products - https://www.sma.de/en/products/planning-software/sunny-design-web.html

 

HYbrid inverters due to high DC currents are much costlier than grid ties. 

One sunny tri-power - https://www.sma.de/en/products/solarinverters/sunny-tripower-core1.html   may be enough and cheaper than supporting full 50 KW with batteries.

 

Critical loads can be offloaded to Quattro or sunny =island

 

Is HYbrid PV diesel an option? what about the night load 

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2 hours ago, Chris Hobson said:

50kW as hybrid  inverters

Why hybrid? Does he want backup when there is an outage, or does he want to do self-consumption, ie store surplus power in batteries and use it when there is clouds/at night? Is the backup requirements the same as the running requirements?

The limiting factor is going to be the batteries. I've seen pictures of Infinis stacked 6 deep (2 times 3 really, 3-phase), but the inifni only goes up to 10kva far as I know, so you'd need 6 of them to get to 50. Technically if you want 50 (and not 45) you'd need 6 Quattros as well to make. Once again, I've seen pictures with 6 quattros and a bunch of Froniuses that does that kind of powerlevels.

I guess you know which one I'd like to play with, even if we are talking 6-figure numbers here :-)

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2 minutes ago, plonkster said:

Why hybrid? Does he want backup when there is an outage, or does he want to do self-consumption, ie store surplus power in batteries and use it when there is clouds/at night? Is the backup requirements the same as the running requirements?

The limiting factor is going to be the batteries. I've seen pictures of Infinis stacked 6 deep (2 times 3 really, 3-phase), but the inifni only goes up to 10kva far as I know, so you'd need 6 of them to get to 50. Technically if you want 50 (and not 45) you'd need 6 Quattros as well to make. Once again, I've seen pictures with 6 quattros and a bunch of Froniuses that does that kind of powerlevels.

I guess you know which one I'd like to play with, even if we are talking 6-figure numbers here :-)

At 50 KW with multiple units, it gets very sensitive to Size and length of cabling both AC and DC  due to sharing limitations. Also, the addition is not arithmetical

Unless it was an upgrade /addition to existing it is always preferred to have less no of big units. I think Victronhas some thread on the Discuss but I can not find it for now 

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16 hours ago, plonkster said:

ABB has a hybrid diesel solution.

I'll have a look at this.

Our brief was 350 kW panels, 7 inverters and 768 batteries. It is a preliminary budget quote. 

16 hours ago, plonkster said:

I guess you know which one I'd like to play with, even if we are talking 6-figure numbers here :-)

I used 15kVA blue stuff as a basis for the quote. and yes  runs to 6 figures. The batteries are a problem in my mind.

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16 hours ago, plonkster said:

Why hybrid? Does he want backup when there is an outage, or does he want to do self-consumption, ie store surplus power in batteries and use it when there is clouds/at night? Is the backup requirements the same as the running requirements?

I don't know. This happens when you accept a brief and do not get time to go through it with the client before he disappears to the next important meeting.

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