12 volts vs 24 volts

[73powerstroke]

So im wondering if going from 12 to 24v solves my problems.
I picked up a 24v inverter today from santan solar. Those guys are awesome.
Here's my scenario.
I have 8 santan 240w trina panels( well actually 10 now but not hooked) and currently 2 epever 40amp tracer 4210an cc with 2s2p hooked to it and a 12v battery bank.
Simple math says 240w x8 =1920w ÷14.4 v = about 133amps. My two cc will produce 40 amps each under load. I cannot get more than 80 of the 133amps obviously. But when I go to 24v shouldn't I be able to?
1920w ÷28.8v?or is it 24.8? = 66amps
So the 2 controllers need to only put out 33amps at 24v ?
I know cc says max pv array input at 12 is 520w and at 24v its about double.
I think this means I'm good?
What should my voltage be in a 24v system? Is it exactly 2x 12v system?
So I have everything hooked up and set to 24v. I'll be able to test it tomorrow.
Is there any reason 12v could be better than 24v ?

 

[Don B. Cilly]

24 would be double, yes, and the only reason to use 12 would be to power 12V appliances directly, but that is easily solved. Just go 24.
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[73powerstroke]

24 would be double, yes, and the only reason to use 12 would be to power 12V appliances directly, but that is easily solved. Just go 24.
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It's 24 now. I got it online about 6pm as sun was low. Ran the ac unit but solar production was low.
So I should be able to utilize most of my power on smaller cc now? And not miss out on anything

 

[Don B. Cilly]

Yes, you should. You have rewired your batteries for 24V, right?
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[73powerstroke]

Yes, you should. You have rewired your batteries for 24V, right?
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Lol oops ? ? just kidding. Yes

 

[73powerstroke]

I think my load output is 24v now also? I have 12v fans wired to the load of cc

 

[Any name you wish]

I think my load output is 24v now also? I have 12v fans wired to the load of cc

Yes, it is now 24V.

 

[Any name you wish]

Each of those controllers can handle 1040W of incoming solar. To charge the battery at 40A each, they would both need to be screaming at max output. I don't think you will get max power from those panels as I have mine configured in the same fashion. Two more panels and another 40A CC and you got yourself one hell of a system.

 

[Don B. Cilly]

The fans, you can use a 24/12 converter, or simply wire them in series if they always run together. It's what I do with mine (and the 12V bulbs).
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[Don B. Cilly]

Each of those controllers can handle 1040W of incoming solar.

Well, if he has 1920, /2 it's 960 - which he's never going to get in those temperatures anyway...
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[73powerstroke]

Each of those controllers can handle 1040W of incoming solar. To charge the battery at 40A each, they would both need to be screaming at max output. I don't think you will get max power from those panels as I have mine configured in the same fashion. Two more panels and another 40A CC and you got yourself one hell of a system.

I bought 2 more panels and another cc

 

[73powerstroke]

Each of those controllers can handle 1040W of incoming solar. To charge the battery at 40A each, they would both need to be screaming at max output. I don't think you will get max power from those panels as I have mine configured in the same fashion. Two more panels and another 40A CC and you got yourself one hell of a system.

I was getting 40amps under heavy load on 12v. Of course this was very over paneled.

 

[73powerstroke]

Well, if he has 1920, /2 it's 960 - which he's never going to get in those temperatures anyway...
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We have been 90 plus every day.

 

[Don B. Cilly]

I quite like those Epevers actually. My 30A runs very close to 30 in winter, doesn't even get hot, barely warm.
One 30A is enough for me ATM. I have two good panels on it, two bad ones on the AIO.


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[73powerstroke]

I quite like those Epevers actually. My 30A runs very close to 30 in winter, doesn't even get hot, barely warm.
One 30A is enough for me ATM. I have two good panels on it, two bad ones on the AIO.

View attachment 101620
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They do run cool even at max. I just wish I had gotten the other version with the updated display

 

[Any name you wish]

I bought 2 more panels and another cc

LOL! It seems you have caught a bug. So without the other panels installed now, what is your current charge rate on each controller? Mine peak out around 11-1 every day so feel free to wait until then. I am interested on how those panels perform.

 

[Any name you wish]

They do run cool even at max. I just wish I had gotten the other version with the updated display

You have the USB to RS485 with those? Run that into a small computer. Monitor all three at the same time.


I have one 30 and one 40A version. Software allows me to also configure parameters easy.

 

[73powerstroke]

LOL! It seems you have caught a bug. So without the other panels installed now, what is your current charge rate on each controller? Mine peak out around 11-1 every day so feel free to wait until then. I am interested on how those panels perform.

I won't know till later . But so far they seem to really put out close to 100% of rated. It's amazing, and in low light they really are impressive compared to monocrystalline.

 

[73powerstroke]

You have the USB to RS485 with those? Run that into a small computer. Monitor all three at the same time.

View attachment 101643
I have one 30 and one 40A version. Software allows me to also configure parameters easy.

I was looking at that bt wifi adapter but they are $20-25 and I would need 3 so I passed. How do you connect to the computer?

 

[Any name you wish]

These I think come with them.


I download the software from the EPEVER site and run it by setting up the comms and such on the computer for each cable, then monitor. I ran out of USB ports as I also monitor the battery as well.