Connecting solar panels to 16x batteries of 12V in series

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Rick H Parker

Registered:1489180564
Posts: 725

Posted 1498848442 · Edited	Reply with quote #31

Let see 2 * 192V * 38ah = 14.59 Kw-hours of storage. 1 * 192V * 65ah = 12.48 Kw-hours of storage. He is offering you 85% of the storage capacity of 2x (16x 38Ah). You would need 1 X (16 X 76ah) to to get the same capacity as 2x (16x 38Ah) Just do the math 1 X 16 X 76 = 2 X 16 X 38 .... __________________ Rick H Parker Kansas, USA Electronics Engineering Technologist

marco.rc.santos

Registered:1498416731
Posts: 13

Posted 1498851560 · Edited	Reply with quote #32

I know he is offering less, but that's what he has. And here it's hard to find these types of batteries, so I'll ask for a partial refund and we'll settle. Here the renewable energies are a very small market that is slowly dying with the current economical crisis, due to the wrong general mindset, so I want to set up the system as quick as I can, because I don't know when it will get better and the suppliers start coming back (or the ones here start receiving new equipment). This is Africa, sometimes this type of compromising is the only option...

Rick H Parker

Registered:1489180564
Posts: 725

Posted 1498854836 · Edited	Reply with quote #33

I think, I got it. The vendors in Angola don't want to invest in inventory until they are confident there will be a market for it. So best grab what you can when you can. Sure explains the urgent to get a balanced system this time. __________________ Rick H Parker Kansas, USA Electronics Engineering Technologist

marco.rc.santos

Registered:1498416731
Posts: 13

Posted 1498856782	Reply with quote #34

Exactly! There were some vendors who took the chance in the past, when it was easy to get inventory here, but people just weren't into renewables. And when the crisis started they went bankrupt. My solar panels were the last ones sold to the public by that store. They said they were only into big contracts from then on, as they would import only after the contract was signed, guaranteeing their revenue.

Rick H Parker

Registered:1489180564
Posts: 725

Posted 1498941426 · Edited	Reply with quote #35

Companies will replace their electric forklift battery bank when the capacity drops to where they cannot run the forklift for 8 hours+ per charge. It not enough capacity for their use but still a lot of capacity. You can often get a good deal on the used battery bank from the companies that supply fork lift batteries. Most are wired for 12V, 24V, 36V or 48V but they can be rewired for 192V just look for a bank that has multiples of 16 in the battery bank. There will be a supply of these for as long as there are electric forklifts running ..... __________________ Rick H Parker Kansas, USA Electronics Engineering Technologist

marco.rc.santos

Registered:1498416731
Posts: 13

Posted 1512375700	Reply with quote #36

Hi to all! So I finally succeeded to replace the batteries to 16x 65Ah and installed the 192V solar charge controller. The controller charges the batteries, but I still have the smoke detector in the room going off, even with some ventilation, so I suspect the batteries are gassing. This doesn't happen when the batteries are being charged by the UPS and, in this case, the charging current is lower (maximum 1A) but the voltage rise on the batteries is quicker than when charging with the solar charge controller. As far as I read, the VRLA batteries shouldn't normally gas, but I'm wondering if it's normal to do some gassing on the first charges maybe... This is the second day I have the solar charger connected and still have the same issue. Can I please have your thoughts on this one? Thank you.

Rick H Parker

Registered:1489180564
Posts: 725

Posted 1512383797 · Edited	Reply with quote #37

VRLA batteries shouldn't normally gas Overcharging a VRLA wiil decomposed the electrolyte. If have both the UPS and Charge controller connected to the battery bank, the charging profiles and perimeters of both must match. Also you need to make sure the total current from both does not exceed the maximum charging current of the batteries. What is the charging profile and perimeters programed into the charge controller? What is the charging profile and perimeters programed into the UPS? What is the charging current of each? __________________ Rick H Parker Kansas, USA Electronics Engineering Technologist

marco.rc.santos

Registered:1498416731
Posts: 13

Posted 1512391363 · Edited	Reply with quote #38

I don't have access to the charging profile and parameters of the UPS, I just know that the maximum charging current is 1A. Attached are the charging parameters and profile of the charge controller. Yesterday I recorded the charging current and it reached a maximum of 8A, on a bright sunny day. One hour ago I cycled through the views of the controller and found a VPV value varying between 229V and 236V, while the battery voltage was 214V and room temperature 30º C. The controller is now powered OFF. Attached Images Charging settings.png (53.19 KB, 9 views) Charging profile.png (200.80 KB, 10 views) VPV.jpg (2.03 MB, 9 views)

Rick H Parker

Registered:1489180564
Posts: 725

Posted 1512407269	Reply with quote #39

What is the make and model number of the batteries? __________________ Rick H Parker Kansas, USA Electronics Engineering Technologist

marco.rc.santos

Registered:1498416731
Posts: 13

Posted 1512422186	Reply with quote #40

You can find the batteries' labels attached. Attached Images Novo Documento 11_15.jpg (495.78 KB, 6 views) Novo Documento 11_16.jpg (392.31 KB, 6 views)

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