₦airaland Forum

ceaser:
I'm very sure he doesn't imply connecting one panel array to drive two CCs simultaneously. That's one of the basic things one learns not to do on the journey. In fact the wiring of one array to 2 CCs will be one I can't wrap my head around.

I think he meant that the the ipowerplus and PowMr both have their independent array, but the panel array for the PowMr exceeded that allowable for the IpowerPlus but within the acceptable limit for the PowMr. The resultant error was only corrected when they were forced to reconfigure the PowMr array, sacrifice it and therefore underutilize the 150v voltage limit of the PowMr to allow for the 75v ipowerplus not to be confused.

Speaking of which I actually bumped into a YT video of a hybrid inverter with two different CCs installed inside it and the two CCs receive their input from two different arrays. The output AC of the inverter is split phase into 120v (in two places) so that if you are in regions with 100v to 120vac, you just connect to one phase but if you are in Nigeria for example you connect the two 120vac phases across to get your 240vac output voltage.

I'll see if I can retrieve the link.



Edited. I see you've responded.

chris81964:
Call oh. 08171075866

Oshomo12:
Thank U for this.



Ok, let me rephrase:
Your setup is 48v right? Which makes it 16s, now U have 24 of it in parallel Abi? If yes, then I think U will require a lot more patience to test this cells

I will prefer U do it stage by stage, and group them by voltages while discharging each set with the same amount of load for a specific period. Kindly answer this questions up and we move forward from there.

Oshomo12:
You can actually do this with a voltage meter, just check the voltage of each cell(under load, and be extremely careful o!). The weak cells will show face, as there will be a large difference, up to or even more than 1v. Identify and remove them immediately. It's a task of patience!

chris81964:
I have it. You can borrow mine

NiyiOmoIyunade:
Are you based in Lagos? It may be possible to share a MK3 USB if you are located close enough. Please note that this dongle is only needed to setup the Multi or Quattro, for the MPPT Chargers you only need a veDirect to USB cable. I still have a few spare units of those as well.

mctfopt:
You can buy a [url=/sudxtb]busbar here at jiji[/url] or try this [url=/1j9wqf]conical insulator[/url] and DIY your own insulator

ceaser:
I just thought about this now:

How about you use a smaller version of this high tension insulator used by NEPA guys as your base (support) for attaching either side of your bus bars to the board, in place of the wooden supports.

Those insulators usually have thru holes to screw 'em on any receptacle, your bus bars and board in this case.

Aside from guaranteeing poor heat transfer to the wood board, it will also provide some aesthetic.

Queed:
Hello essegis!
I think that I could be of help to you.

First, I would make a few assumptions and you can make modifications based on your particular setup.

Your setup is 24p-4s Yes

I assume each cell to be 2.2Ah Nah, 8ah

with 24p you have a total of 24 * 2.2 = 52.8Ah

I will assume a typical 10C discharge = 5.28A Is 10C not actually 528A?

I assume you are balancing @ 3.2v This is the nominal na, for the bottom balancing I'm thinking of 3v or a little less

Taking max deviations = 3.5v I don't understand this

Resistor value should be 3.5/5.28 = 0.66 ohms

Power of resistor 5.28* 5.28 *0.66 = 18.4W

Ok so those are the theories!

In practice, it would be better you use two 1ohm resistors, rated at least 15W each, connect in parallel.

I am still a bit confused on how you want to go about this, is that you intend on connecting the balancer manually? Or you have a circuit already to automate everything? On YouTube it's to parallel the cells and find a way to discharge them to your desired low voltage. My problem is the discharge as I wasn't able to get any equipment for that before the lockdown hit

What about active balancer? Have you thought about them? The are more effective and efficient, I could design design one for you based on your setup. Active balancer might be required when they come fully into service

NiyiOmoIyunade:
My Oga.

The CC is capped at ~100amps battery output. I have a 48v battery system with max charge voltage set to 52.5volts ergo I can only process about 5,250watts of power through the CC per time despite having a 7.7kw array attached.

Benefit is that I see 80-90amps through the CC before 11am.

I still have the MorningStar CC for sale at 220K please - brand new MPPT 60A in factory packaging

NiyiOmoIyunade:
Most properly designed MPPT CCs allow some degree of oversizing the PV array. This capability is not uniformly implemented amongst CCs e.g with EP Solar CCs there is a calculation that caps you at a certain size relative to battery voltage or such. With a MorningStar, you can actually oversize nearly infinitely. I have oversized 200% + with no trouble but at some point it becomes inefficient to keep adding more panels.

One thing I can tell you from experience is that the CC will run much hotter when you oversize and you are advised to incorporate a cooling fan or AC to preserve CC lifespan and performance (avoid CC limiting current when running too hot)

I currently have a 7.7Kw array on a Victron MPPT 250v/100A - effectively oversizing by more than 25%. The CC runs very much hotter than its brethren so I added external cooling.

Worthy of note also is the tolerance for errors reduces with an oversized array -- apart from VoC you should never exceed the CC's max short circuit current limit. If you do then you better, have connected things the right way around (no reverse polarity mistakes or battery disconnects at high wattage charging) else you will surely fry the CC and make a sweet smelling burnt offering to the Sun Goddess to atone for the error of your ways

ceaser:
Folks, I have actually gotten away with 150w x 6 (2s3p) 12v system on a 60A MPPT. That's clearly 180w above the allowable limit of 720w (12v system) for the CC.

Just curious if I may get away with 300w x 6 (3s2p) 24v system on the same type of CC. That'll be 360w above the allowable 1,440w (24v system) for the CC.

Please anyone who has done that without frying the CC. Wanna be sure it's practicable.

I know 2s is good, but I prefer 3s cos the vmax of the CC is 150v. I don't wanna do 250w panels either.

spartacus11:
Makeskyblue MPPT 40A or 60A
Distance 16 yards or 15 meters it can be less but not more

12v or 24v it can be either

Trippledots:
Hahahaa.... Ekushe oh. I haven't seen your setup, just your cart in the pix u posted.

Trippledots:
Are these cells new? Cos i saw them advertised as used cells for $9.99 per cell somewhere else, although stock was sold out.

spartacus11:
I wanted to buy ftom naija here only 120v available

spartacus11:
They have 48v too

The AC output i have seen are mostly 120V, reason i really don't like it. i need my 220v to 230v confirm
But their products is very rugged

ceaser:
What I saw one guy (Will Prowse) use in a you tube video was 20 watts resistor, if I remember quite well.

The resistors you'll have at home will likely be the smaller ones, and I'm not quite sure you can use those.

earthrealm:
I mean a pic showing the whole setup/wiring.
Wanna compare the aesthetics vis a vis the cost with the ATS

ojeysky:
How many hours and years will the Gen last? On the long run, the 12v 105AH lithium will save cost than the small Gen while also saving from environmental hazards

GeorgeD1:
Hello essegis,
I see niyi and JUO already done justice to this. Sorry I'm just seeing your post now.
Yes, I'm using the tristar meter hub which combines my total solar harvest from 4 charge controllers...
For cable size, I have 3pcs 75mm diameter cables feeding in from the battery bank to the inverter...
As for number of panels/ratings, that would be 48pcs, with 24pcs 315w Solarworld panels from kiekie and 24pcs 330w Canadian Solar from Gennex...

spartacus11:
Wow i think i am more comfortable with Lifepo4. Still trying to learn more about putting them together, and appropriate way to charge them and also about the balancing issue

Need to learn more about the balancing, i will like to ask is BMS actually needed on a lifepo4 set up, if you charge and discharge appropriately? I didn't see this guy using any


https://www.youtube.com/watch?v=E4pN4DVPOcY

JUO:
he has 24pcs before we added another 24pcs. Let him confirm the watts

NiyiOmoIyunade:
Without any analytical rigor 12kw to 15kw of panels could produce 10kw of output if the conditions are right - clear skies, sunny day, proper array orientation, large enough loads and sufficiently hungry battery - if all these variables collide then 10kw instantaneous is feasible.

I recall hearing that Oga GeorgeD has a very huge battery bank as well sufficient to easily need and sink so much solar juice - I will let him do justice to his system details.

Meanwhile I have a 19kw array that should go live next week - the array will feed multiple large loads and 40kwh of PylonTech storage - I should be in a position to post live system stats and pictures at that time.

I also have 60A MorningStar MPPT for sale - brand new in factory seal in case you are interested or Oga George wants a spare - despite the move in exchange rates, I will cut anyone who asks a sweet deal at the old market price

NiyiOmoIyunade:
I believe the secret lies in a little known product called the MorningStar MeterHub - it allows you to connect up to 15 charge controllers or other devices to thesame MeterHub network and display the aggregate results on just one meter.

Oga GeorgeD is aggregating the output from all his four charge controllers into one single display - which in my opinion is the smart way to do it.

GeorgeD1:
suddenly it feels like dry season all over again.
with daily harvests topping 42kwh and instantaneous breaking the 10kw barrier....
indeed, the sun is the answer!

GeorgeD1:
suddenly it feels like dry season all over again.
with daily harvests topping 42kwh and instantaneous breaking the 10kw barrier....
indeed, the sun is the answer!