40kw solar panel system

[Fatawan]

I wasn't advertising that site. I was linking to someone who would counter what Russ said. Victron HAS been in business for many years, and retailers speak of their legendary reliability. The linked site speaks of using them starting in 2002. He said "I don't know about this company" yet he is willing to question their reputation. That should not go without a response.

[Fatawan]

Mod note - link removed - if they want to advertise they pay -

Ask that guy

[russ]

Why would you make fun of Victron? They have a well respected, high quality product. They could provide a safe solution for the OP.

Pardon? A cost effective product and a company selling a product that has been around for years?

[Fatawan]

I don't know about this company but if a complete system is what counts then I sell the same. We at Batteries To Save The World put all the funds in R&D so no fancy web site - just send a check and see what you get in the mail. The systems have been designed to meet all eco/green requirements. If a prospective buyer has an unmet demand tell us and we will add it to the list - only words anyway. Satisfaction guaranteed - our satisfaction.

Why would you make fun of Victron? They have a well respected, high quality product. They could provide a safe solution for the OP.

[russ]

How about this complete Victron system, including the lithium batteries? Anyone had any experience with Victron? It seems very complete.

I don't know about this company but if a complete system is what counts then I sell the same. We at Batteries To Save The World put all the funds in R&D so no fancy web site - just send a check and see what you get in the mail. The systems have been designed to meet all eco/green requirements. If a prospective buyer has an unmet demand tell us and we will add it to the list - only words anyway. Satisfaction guaranteed - our satisfaction.

[Fatawan]

How about this complete Victron system, including the lithium batteries? Anyone had any experience with Victron? It seems very complete.

http://www.victronenergy.com/inverte...rgers/quattro/

http://www.victronenergy.com/upload/...2%20-%20EN.pdf

http://www.victronenergy.com/dc-dist...-systems/lynx/

http://www.victronenergy.com/batteri...ery-24v-180ah/

[russ]

On an industrial basis you almost never want to be first - the risks are great and rewards few.

One always to adopt what someone else has proven because lost production is far more important than cool.

Of course here it is not lost production - only small things like a home and family.

[inetdog]

Can you expand on that first sentence? Why would it not be suitable for a home system? I was imagining a 25kWh-ish system to be used as a sink for solar PV, backup power, electric vehicle charging, etc.

My main concern is that for industrial use, the system will (presumably) be designed, specified, etc. by a professional engineer, the location will be selected based on the risk factors and environmental conditions appropriate to the energy density of the batteries and (nominally) trained operators will be responsible for the maintenance and monitoring of the system. I am not under any illusion that a responsible private system operator could not do just as well, but the dangers involved in not addressing all of these concerns, with that kind of energy storage, is high.

That large an FLA or AGM system is pretty well understood, and the risks of thermal runaway, short circuits, etc. are well known.
The Corvus system is more of an unknown at this point.

[Fatawan]

I am not sure whether this level of energy density is suitable for a home system, based on operator training, battery location, etc. But it sure does look interesting.

The Corvus website does indicate Solar PV as a suggested use for (some of?) their products.

Can you expand on that first sentence? Why would it not be suitable for a home system? I was imagining a 25kWh-ish system to be used as a sink for solar PV, backup power, electric vehicle charging, etc.

[russ]

Bali

I think you should inquire at www.corvus-energy.com The cost is high, but it would simplify everything you are trying to do. I read that it is $1,100/kWh, but there is no maintenance, 20 year life, you can draw it down fully, has BMS, etc. It might be worth the extra expense.

I joined to see if anyone has any experience with these Corvus batteries in a solar storage system. I couldn't find anything in a search online

Let someone else be the tester - after a few years when the bugs are worked out one will know whether or not to buy them.

[inetdog]

Bali

I think you should inquire at www.corvus-energy.com The cost is high, but it would simplify everything you are trying to do. I read that it is $1,100/kWh, but there is no maintenance, 20 year life, you can draw it down fully, has BMS, etc. It might be worth the extra expense.

I joined to see if anyone has any experience with these Corvus batteries in a solar storage system. I couldn't find anything in a search online

No experience to report, but just for clarification the earlier discussion was on LiFePO4 batteries, Corvus are Lithium/ Nickel-Manganese-Cobalt (NMC). That has a significantly higher energy density than Lithium/ IronPhosphate chemistry, but it is not as inherently safe and has a shorter life span. (2000 cycles to 80% DOD is still pretty good!) (Reference: http://www.dowkokam.com/resources/Ce...Info_Sheet.pdf, you will have to register to view or download). What Corvus does is package the DowKokam cells with a complete integrated BMS to deliver an industrial grade package.

I am not sure whether this level of energy density is suitable for a home system, based on operator training, battery location, etc. But it sure does look interesting.

The Corvus website does indicate Solar PV as a suggested use for (some of?) their products.

[Fatawan]

Bali

I think you should inquire at www.corvus-energy.com The cost is high, but it would simplify everything you are trying to do. I read that it is $1,100/kWh, but there is no maintenance, 20 year life, you can draw it down fully, has BMS, etc. It might be worth the extra expense.

I joined to see if anyone has any experience with these Corvus batteries in a solar storage system. I couldn't find anything in a search online

[Bali88]

What do you have against creating 48v banks with 4 12v batteries and run them parallel (yes with buss bar)? Or 60v banks with 12v bats. (not ideal, but in Indonesia they only make 6 and 12v batteries)

Three strings, each with 9 or 10 48v banks. Each string attached to a SMA Sunny Island 5048

[Sunking]

Again very ignorantNaptown: I which I could buy 48v deep cycle batteries, but they are not sold in Indonesia. Yes, lots of labor and cables to make 48v banks.

You will not be using 48 volt batteries. You will be using 2 , 4 or 6 volt batteries at the required AH capacity. There is no such thing as a 12 volt 21,000 AH battery. Largest capacity battery you can find is a 2 volt 4000 AH battery and it weighs 420 Kg for a single battery. If you buy 24 of them to make a 48 volt system is 48 volts @ 4000 Ah or 192 Kwh which is short of your objective of 252 Kwh.

At 252 Kwh the lowest voltage you can run is a 60 volt battery @ 4000 AH, which is still IGNORANT, That would take 30-2 volt 4000 AH cells weighing some 12,600 Kg or 27,778 pounds, requiring 400 amps of charge current. The real solution is to use 516 volt batteries @ 500 AH using 86-6 volt 500 AH batteries. That will get you down to a manageable 50 amp charge current that does not explode or cost a fortune. Industry also makes real nice 3-Phase inverters with 500 volt DC input. You gotta a lot to learn before you kill or injure someone.

[Bali88]

Thanks Mike,

I am looking for forklift batteries.

The batteries that I have in mind for the project are the 200AH batteries at http://www.incoe.astra.co.id/eng/pro...4122010171119/

Sunny