Off Grid Crypto Mining with 48V, system design

[Mike90250]

> These particular panels have a 46.1 voc. Does that mean with a 150 voc input Mppt will only accept 3 of these panels?

On a warm 75F morning, 3 panels in series gives you138.3v When it's 50F, you might get 149V, but at 35F, you get 157V - which cooks the controller rated for 150. Unless you are i the tropics, and will never get much below 60F, you are limited to 2 panels in series, or move to a 600V, 80A controller .

As tempature goes down, the Voc goes higher. Your panels will have the exact spec on their label, I just typed in some educated guesses

[robbyg]

Okay thank you. I figured for a 10kw system, the total amps would be 266.1, if they are 8.87 amps per panel. The voc is 46.1, Vmp is 37.8

(For example) I'm looking at the midnight classic 150 controllers. They are rated at 150 volt, 96 amps.

Does the 150 max voltage mean I can string 3) 46.1 voc panels at a time to a combiner box, as long as I don't go over 96 amps?

3 strings of 3 panels, 113.4 Vmp and 138.3 voc for each string. 26.61 amps per string. Total amps 79.83

Is my math correct on this?

Since I'm basically starting from scratch on a higher voltage system, would it be better to go with 72 volts instead of 48?

There is another well known Solar Guy on YouTube who is trying the same thing and he has basically said he is giving up on it.
I get the feeling that your going to spend a whole lot more money on this system than what you will ever recoup from it.
And yes I know a single BT can generate 50K but I get the feeling from his post he has been running his a long time and had zero return.

[Fullblast]

Okay thank you. I figured for a 10kw system, the total amps would be 266.1, if they are 8.87 amps per panel. The voc is 46.1, Vmp is 37.8

(For example) I'm looking at the midnight classic 150 controllers. They are rated at 150 volt, 96 amps.

Does the 150 max voltage mean I can string 3) 46.1 voc panels at a time to a combiner box, as long as I don't go over 96 amps?

3 strings of 3 panels, 113.4 Vmp and 138.3 voc for each string. 26.61 amps per string. Total amps 79.83

Is my math correct on this?

Since I'm basically starting from scratch on a higher voltage system, would it be better to go with 72 volts instead of 48?

[SunEagle]

What am I a year too late for?



If I were to run 2) 37 volt panels in series, wouldn't it make the system 74 volts, then the mppt will regulate it to 48v?

You say most large Mppt controllers accept up to 150 voc on the input.

These particular panels have a 46.1 voc. Does that mean with a 150 voc input Mppt will only accept 3 of these panels?

I'm considering buying 30 of these 335 watt panels.

If I am correct, 30 panels will equal 10,050 watts at 48v. Would this mean I need 10, 150 volt mppt charge controllers?

Uh with 30 335 watt panels you will have a system over 10kw. So to charge a 48V battery bank you will need over 200 amps of CC's to properly charge it. That would probably require 3 80amp MPPT CC's.

[Fullblast]

What am I a year too late for?



If I were to run 2) 37 volt panels in series, wouldn't it make the system 74 volts, then the mppt will regulate it to 48v?

You say most large Mppt controllers accept up to 150 voc on the input.

These particular panels have a 46.1 voc. Does that mean with a 150 voc input Mppt will only accept 3 of these panels?

I'm considering buying 30 of these 335 watt panels.

If I am correct, 30 panels will equal 10,050 watts at 48v. Would this mean I need 10, 150 volt mppt charge controllers?

[peakbagger]

You are about a year too late. Look up a DC Solar trailer. Add some panels and you have all the pieces and parts you need. If you do not need the AC, sell off the inverters.

[Mike90250]

The voc is 46.1, vmp 37.8, imp 9.87
Can I run these panels parallel to achieve 48 volts, or will they need to be in series.

37V will not charge a 48V bank, so you have to run 2 panels in series. Most large MPPT controllers accept up to 150Voc at their input.

[Fullblast]

Thank you for the input about the forklift battery. I'm looking into it.

I know it's easier to run miners off of the grid, however I will be moving to an area without power and want to do this for some extra income.



I would like to build a 10,000 watt 48v system to run this. I've been thinking it may be more efficient to run them from sun up to sun down, then scale back to low power mining at night. Theoretically I would not need a massive amp hour battery bank if I ran it only during the day.

I'm trying to understand about wiring solar panels to a 48v system.

Was looking at getting 30 used Canadian solar 335 watt panels (CS6U_33M)

The voc is 46.1, vmp 37.8, imp 9.87

Can I run these panels parallel to achieve 48 volts, or will they need to be in series.



The wattage on the 30 panels is 10,005. Would it be better to run two 5000 watt systems or one, 10000 watt?

If I ran these panels in series, the voltage goes up, but does it decrease the total wattage of the panels?

I understand 12v parallel, still trying to understand 48v.

[Mike90250]

Look into used forklift battery packs. They are made up of +1000ah 2v cells

just to give you a heads up, doing this with solar & batteries will cost several times more than grid powered.

[Fullblast]

Hello all. This is my first post. I've had a 12v 500 watt solar system on my RV camper for about 10 years now that I installed myself and has worked great. I have Concorde Lifeline agm batteries wired parallel 12v and Kyocera panels. I'm new to 48V and still trying to learn.


I'm trying to build a separate 48v system to power a crypto mining rig that pulls 3250 watts continuous and want to run it 24 hours per day. .

I need a lot of capacity at night. I live in Texas and run about 10 hours per night off batteries.

I was looking into getting 13) 48v Trina 410s for a total of 5330 watts.

To make it those 10 hours running off batteries at night I would need 677 amp hours. 3250/48=67.7

Then add another 10% for inverter draw on top of that for inverter draw. So I would basically need 744 amp hours total.

In order to not bring my batteries under 50% discharge, I would have to have a 1500 AH battery bank.

How can you get a battery bank with this many amp hours while they're wired in series for 48v?

I had a mind to get 4) Sun Xtender PVX-12255L 12v batteries. They are 258AH at 12v

If they are wired in series to 48v, won't the bank stay at 258AH?

What would be the best way to get high capacity at 48v?

Use 2) 24v power banks in series and parallel them together to make 48v?

Any help would be greatly appreciated.