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Big installations - what do they use?


Bobster
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my guess would be SMA or Fronius most probably, i have my doubts they have storage on a system like this, the cost would be astranomical. I did read an article on a mine that used grid tied solar coupled with a generator to reduce diesel costs so i would imagine they could do that during load shedding... Just a guess.

Let me do some research.

 

Edited by Basil Katakuzinos
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1 hour ago, Basil Katakuzinos said:

my guess would be SMA or Fronius most probably, i have my doubts they have storage on a system like this, the cost would be astranomical. I did read an article on a mine that used grid tied solar coupled with a generator to reduce diesel costs so i would imagine they could do that during load shedding... Just a guess.

Let me do some research.

 

This makes sense. I used to work for Netcare and back then all the hospitals had serious diesel generators (see a post of mine elsewhere on this forum about back up power abuse) 

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3 minutes ago, Bobster said:

This makes sense. I used to work for Netcare and back then all the hospitals had serious diesel generators (see a post of mine elsewhere on this forum about back up power abuse) 

Have been to a small data center that had 3 massive CAT generators and an entire room of lead acid batteries for inverters that where used while the cats started up. They had a contract to recieve a tanker of fuel PER DAY, i can only imagine how expensive that becomes.

Edited by Basil Katakuzinos
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1 minute ago, Basil Katakuzinos said:

Would be interested to see how well grid tied PV and generators work together, i would not be suprised if the SMA Grid tied anti islanding becomes problematic connected to a generator. Is it something officially supported by any Grid tied inverter manufacturers.

Well a hospital has to have power 24/365 for theatres and ICU. So they must have generators or storage. 

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2 minutes ago, Basil Katakuzinos said:

As i said above, i think storage would be wayyy to expensive on such a large scale.

I'm sure. But they have a 400kw array, so at midday today they had lots of power to do something with.

I worked for them years ago. Hospitals are resilient institutions. You were wondering earlier about diesel costs. I recall that for Y2K they had two hospitals in Jhb set up to go 3 days with no municipal services. This included converting swimming pools to diesel tanks and having tankers full of diesel already paid for and on stand by, plus big ass water reservoirs. 

The idea was that if services at other hospitals failed the patients would be evacuated to one of these beefed up hospitals.

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Mostly the Commercial scale of economies are using Grid tied systems. They will definitely need storage & yes usually a combination of both. Nothing different about how its all done much like a residential setup except things are scaled up. So the Grid tied system usually funds the storage in the long term. They have essential loads & non essential loads. Pretty sure that ICU or higher care units are essential. The non essentials are lighting in basements or storerooms or anything surplus to requirements or nice to haves. 

It looks from the outside like massive numbers but again much like a household the scale is much the same except add a few zeros. Eg. A certain commercial client has a monthly Eskom bill of R80K for electricity. So imagine a R4bar system will playback in 40 months or just over 4 years.

So a combination of Grid tied & hybrid solar makes for a very serious financial investment. No more diesel for a Generator. Just energy from the sun. It's a business necessity. 

Hospitals especially the Netcare group make huge profits and turnovers. In the economics of it, this is small change & adds to business security & confidence. 

87

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Mostly the equipment used are dependent on the company doing the installation. In our company we use exclusively Huawei as they have a very solid reputation for quality & great backup. They have scales that range from 15kW to 150kw Grid tied systems. So yes, one inverter handles are this energy. It still bogles my mind how they get a single 95kg machine to invert so much energy to AC.

No fans, just a massive heat sink & it's IP65 so this inverter usually in order to save costs lives near the array. Otherwise the DC cabling from 28MPPTs can become very costly. AC cable is cheaper to run to the main meter & DB. 

But to add to others comments there are many other manufacturers like SMA that make great quality inverters. 

87

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13 hours ago, 87 Dream said:

Hospitals especially the Netcare group make huge profits and turnovers. In the economics of it, this is small change & adds to business security & confidence. 

Sir! They are concerned only about the welfare of their patients. Nothing more. To suggest they have a profit motive will achieve nothing beyond getting Discovery Health worked up.

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I have worked at one particular medical institution under their banner & it is in my opinion that Netcare are in no way struggling...Only in my opinion 🤣

I don't want to open up a can of worms about private health care in general in SA or abroad, otherwise we will be here debating this for a long time. 

The point I wanted to stress is that they are a huge commercial enterprise & forking out money to invest in their solar installation is in terms of how much one pays for medical care, quite insignificant.

Yes, Discovery and all the medical aids will try to audit & oversight many things. The power of a Medical Doctor on the other hand is unquestionable especially in these modern times.

Getting back to Solar though, if you are spending big on electricity each month basically you just offsetting your costs into your own solar production by investing in Solar & ditching eskoms Dodgy supply.

Another example, if you spent R7k a month on petrol, an electric vehicle makes sense especially investing in your own home solar infrastructure, as this will be subsidised by you never visiting a Petrol pump again. The same can be said for the Tesla Solar tiles. The roof tiles on a house constitute close to 30% of the cost of a new home. If this cost was offset & Solar tiles purchased you have used an otherwise high expense to offset your solar installation.

87

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Yes, it is a business like any other one and is intended to make profits but keeping a private hospital compliant to government regulations to which they themselves do not adhere to is unbelievable expensive. Rather look at the companies supplying equipment especially life support equipment and the breakages due to negligence from nursing staff is unreal. Just 3 temp probes, 6 SPO2 probes and a few cables adds up to 67k and that is in one week in one ward and not even specialised equipment. People only see the basics when visiting a hospital but believe me there is more to it behind the scenes. Currently to build a new private hospital the cost is between 2 and 3 bar per bed everything included. 

 

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16 hours ago, 87 Dream said:

I have worked at one particular medical institution under their banner & it is in my opinion that Netcare are in no way struggling...Only in my opinion 🤣

Sorry. I forgot to turn on the sarcasm font.

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