₦airaland Forum

AndroBlaze:
No problem, though you hardly need to worry about DOD with lithium (it's how fast you charge and discharge it that affects life more) so enjoy your guaranteed +7kw.

Oh and just checked an email they sent me earlier this year, it was exactly 800k...hope that helps when you contact them.

BigDickProblems:
Congrats man.

HeavenlyBang:
900k now per my last inquiry a few weeks ago.

Fremlin:
With the knowledge I have gotten from here, decided to upgrade my solar

Got 4.2kwh battery from mrreed

Got breakers (prewired) from iinnov8

Got a 3.5kva inverter from Bread

For now, will focus on using grid for charging as panel isn't available for now

ksmart027:
Congrats, how much did you get the inverter?

Fremlin:
336k

Valto:
valtech Energy range of batteries
24v 2.5kwh
24v 3.6kwh
24v 7.5kwh
24v 8.5kwh
48v 17kwh
48v 15kwh
48v 7.2kwh

15ah,20ah,23ah ,50ah ,142ah ,141ah ,314ah lifepo4 lithium battery cells and all types of JBD and JK smart BMS and accessories also a*vailable.

ksmart027:
Thanks for the address, very close to my place. For the bread inverter, do you mean the are noisy? I mean there fan compared to fireman? And do fireman also have 3.5kva? And what is the pv input?? And i saw the bread spec? Does it mean the spec are false. No vex for my too much questions.

Techsinnovative:
Yes totally agree Mr Reeds the better. However, when budget is limited one has to be realistic about ones wish list. At 800+ am already over my set budget.

With 25.6v 280ah cells likely rating is 7168wh, at 80% DOD its about 5734.4wh available which is still great. 6000 cycles promises about 20 years, at 5years am happy with a depreciation cost of about N550/day(thats not bad at all for stable energy in nigeria today.)

Am repurposing the quanta batteries to power low power devices so not getting rid of them just yet.

Thanks a lot appreciated.

Machiny:
this is from the booklet they gave to me. Seems they have different kinds

Fremlin:
With the knowledge I have gotten from here, decided to upgrade my solar

Got 4.2kwh battery from mrreed

Got breakers (prewired) from iinnov8

Got a 3.5kva inverter from Bread

For now, will focus on using grid for charging as panel isn't available for now

Fremlin:
With the knowledge I have gotten from here, decided to upgrade my solar

Got 4.2kwh battery from mrreed

Got breakers (prewired) from iinnov8

Got a 3.5kva inverter from Bread

For now, will focus on using grid for charging as panel isn't available for now

adibo:
Good morning, can you put your prices?

genius43:
If he puts price. There is 85% chance the bot will not let the post see the light of day.

Machiny:
this is from the booklet they gave to me. Seems they have different kinds

brightk:
I don de discourage already I have one of dia booklets dat indicate the pv array is 4000w

brightk:
I don de discourage already I have one of dia booklets dat indicate the pv array is 4000w

Machiny:
this is from the booklet they gave to me. Seems they have different kinds

Mrreed:
I stand to be corrected but a100a cc controller already tells you that you won't get beyond 2700w at any point in time even if your PV is up to 4000w.

Mrreed:
I stand to be corrected but a100a cc controller already tells you that you won't get beyond 2700w at any point in time even if your PV is up to 4000w.

Mrreed:
I stand to be corrected but a100a cc controller already tells you that you won't get beyond 2700w at any point in time even if your PV is up to 4000w.

genius43:
If he puts price. There is 85% chance the bot will not let the post see the light of day.

easyyoke:
My Ogas at the top, Abeg, my Jinko Solar Panels are not producing more than 65-68% of their rated output. They were purchased at Foauni so I know I did not buy fake but I think it is the position of my roof that is not making me see above 68%. Ideally most days, I constantly get about 50% rated power especially as there is mostly clouds these days so I am planning to massively overpanel my setup. I have a Growatt ES3500 Inverter that allows 450V max Vmp and 22Amp Isc and Maximum power at 4500W. I currently have 7pcs 555w Jinko Panel with Vmp 40.9 and Isc 13A. All connected in series. I intend to add another 7pcs. To make 7s2p. My only worry is, this means my Isc will now be 26A. The spec on the inverter says 22A max. I have read in many places that so far you dont go above the rated Voltage input you will be fine. Has anybody overpanelled their setup and will I be fine with this setup

easyyoke:
Make una epp me abeg, my ogas

easyyoke:
Make una epp me abeg, my ogas

Overpaneling is the practice of putting more panels on one charge controller than it's rated for in terms of wattage. When overpaneled the maximum voltage should NEVER be exceeded under any environmental conditions (light and temperature, primarily), but the maximum wattage can be. So your unit has a maximum charger capacity of 4000W. If you put 5000W of panels on it, but they could never exceed the maximum voltage, then it would be considered overpaneled.

First:
There is no guarantee that the MPPT controller in the inverter will be fine with over paneling. Growatt does not provide documentation or advice regarding this practice, but they do not specifically forbid it in their manuals. You are on your own, and while I haven't heard of anyone having warranty issues with over-paneled Growatt inverters, I suppose they could deny coverage for that reason.

Second:
Many, many, many people and companies overpanel Growatt MPPT controllers. Whether it's because they live in a sun-poor area, or have to mount their panels at suboptimal angles, or they just want to use the inverter at its maximum power all the time, it's a very common and generally safe practice.

Third:
The MPPT algorithm starts at the unloaded voltage with 0A of current. It starts to draw current, which due to the way solar panels work, will naturally cause the voltage to drop. It will increase the current in steps until it finds the maximum power point OR it reaches its own internal maximum power limit. So a 4000W charge controller that's overpaneled to 5000W with 5000W of solar power actual available (cold, sunny day) will stop increasing its current draw once it reaches 4000W of power. If the solar panels increase their power, it will reduce the current, if they reduce in power it will continue to adjust the current until the MPP is found. It continues to adjust the current draw throughout operation to maximum power input and keep under its own power capacity limits.

So, in general, the MPPT algorithm protects the charge controller from damage due to overpaneling. However...

Four:
From an electrical engineering standpoint there is likely to be a limit due to the algorithm itself, and the components chosen for the circuitry. A 4000W charge controller with an operating range of 120A to 250A would expect no more than 35A at the lowest operating voltage and the highest power input, and perhaps they only have a 10% margin so they choose a 40A transistor. The algorithm starts by turning the transistor on, and if a customer decided to overpanel significantly it might instead see 120A. Because they chose a slower processor and can't detect the fault fast enough the transistor, coil, capacitors, and other parts may fail.

They don't tell us what their margin is, or give us any maximum solar input current. Growatt gives a "Maximum solar charge current" but that, non-intuitively, relates to the maximum current it will supply to the battery at the battery voltage (48V), not the current it can accept from the solar array. It's used to help size the batteries (if your batteries can't accept this much current it can damage them).

I believe they know and accept that since you can't perfectly match solar panels to charge controllers then many installations will be slightly over paneled, particularly since most of the time the solar panels will not be pushing their maximum current. Further, other parts of the circuity will prevent or delay high instantaneous currents, and other parts of the circuitry can protect the overall charge controller from this sort of situation. So there is a margin, and the margin is significant.

Five:
Using your charge controller at its maximum ratings wears it down more quickly than using it at a lower power output. If you always run 4000W through the 4000W solar charge controller, it simply won't last as long as one run at 50% of its capacity most of the time, and at capacity only 5% of its time - which is typical for solar equipment. Further, it can handle faults better when it's at a reduced capacity than when it's running at full capacity.

Summary:
Overpaneling
- generally works and is safe as long as the other requirements are met.
- is generally not guaranteed to work by manufacturers beyond small amounts due to typical system sizing mismatches
- will reduce the lifetime of the charge controller
- will probably make the charge controller more susceptible to small faults