₦airaland Forum

c0ogumo: Trojan Tips 2 - Determining the Health of a Deep-Cycle Battery

https://www.youtube.com/watch?v=DgiII0OnAZg

shithapuns: luminous claims to be pure sine wave.....http://inverters.com.ng/800VA_to_900VA_Inverter-list.aspx
the best way to know is modified sine wave inverters dont like inductive loads...like fridge or ceiling fan/hair clipper...so if ur inverter carries such loads conveniently , then its probablly pure sine wave

shithapuns: pls anybody has a chart where i can confirm the correct cable size for 24v 45/50amp dc cable.....for my 45mppt charge controller ?....also whats the maximum distance i shud hv between the CC and battery bank

George_D: all,
in line with my post above in reply to dunka,

as part of my pre-upgrade preparations, i carried out battery rotation on my battery bank.
since i was already using a voltage combiner, it meant the rotation only needed to be done
within individual strings and not across the whole bank.

before this rotation, i had earlier checked individual battery voltages to determine their various
state of health. the results were as fascinating as they were instructive. over a year after
installation, battery voltages were almost similar across board and not only that, there was no
sign of early failure whatsoever, thereby giving credence to the effectiveness of the simple
voltage combiner - now rested.

below are voltage results of individual batteries arranged in strings:

s1-1 = 12.59v
s1-2 = 12.56v
s1-3 = 12.56v
s1-4 = 12.55v

-----------------------

s2-1 = 12.57v
s2-2 = 12.52v
s2-3 = 12.59v
s2-4 = 12.58v

-----------------------

s3-1 = 12.57v
s3-2 = 12.59v
s3-3 = 12.52v
s3-4 = 12.56v

----------------------

where s1 stands for string 1, s2 for string 2 and s3 for string 3

tivta: This is confusing oh. From what i have read on http://www.freesunpower.com/faq.php the higher the system voltage the lower the battery capacity cause 48v system that runs on 12v 200ah battery will only give 200ah of power when used with 4 batteries in a series/paralle combination. G.D abeg whats your take? Phelex thanks anyway.

tivta: Thanks G.D
From my calculation and the info i got online, a 40 battery bank of 12v 200ah each with a 24v system with 50% dod will give 24000watts but the same set up with a 48v will only give 12000 watts. Am i right?

earthrealm: have some friends that need professional help to install their solar panel..and also buy a good inverter in owerri, do u know of any good installer/seller?

earthrealm: @ house any solar installer or inverter/battery seller in owerri/imo state?

mayorall: Pure rub.bish, what about if you delayed my goods after the stipulated time?. How much is that?. God help you I meet you one day, you will know kaki no be leather.

Cashkhiid: Thanks CVM, SO GRATEFUL, BUT PLS WHAT DO YOU MEAN BY ''THEIR PARK'' do they have specific places they stay?? PLEASE CVM I NEED A REPLY

earthrealm: ok thanks guy for the info..i have 2 options now

1. use only 2units of my 250v 24v panels
or

2. upgrade my inverter/battery bank to a 24v system


the 3rd option of buying an 80amp cc isn't feasible now, cos of cash constraints.
my cc is morning star

tivta: Thanks. My confussion is actually with the wattage of each pv panel. I mean am i right to assume that each pv panel will produce a maximum capacity of 90percent of its rated output or will it be higher or lower?

tivta: George D. Abeg come oh. Am confused. I taught that no matter the rated output of a pv panel, it will give a max of 90percent power. If so 250*90percent=225watts. Therefore 225*4=900watts. That means 4 250watts is still ok right for a 80amp cc?
Pheleix pls correct me if am wrong.

earthrealm: sorry to raise this issue again...but on another forum some1 told me that my plan to use a 45amp mppt CC with my 250w x 4 24v solar panels on a 12v inverter/battery bank is not good..............that a lot of energy will be wasted at the CC since according to him my panel is 1kw/12v battery bank [since the CC has to down convert the 24v from the panels, to 12v] = 83amps...................and since my mppt CC is only 45amp...the excess 38amps will be wasted.................

I wasn't aware this is so..i tot since the panels are 24v and output 1kw...the max amperage produced will be about 45amps wch the CC has handle ok

pls gurus mek una come helep me o

Canme4u: Dollar rate of when your order was processed... Always have it in mind that they wouldn't cheat you.
Have once used my GTbnk master card to pay on aliexprss, and Gtb charged #164 and when I placed order on CVM their dollar rate was #162.

They will follow the real exchange rate as of that moment your order was processed.

What am saying is that, you may place order now, your money would still be sowing in your account because they have not process it. Once your money is deducted, go and look at your order status, you will see the exchange rate they used there.

I hope am clear enough for you to understand.

Perdon my Grammer blunders.
Am not good with ingliz but am trying to be gooder. Lmfao

einsteino: i was shocked to find it at N167/$ when official exchange rate is N159

abunafiu: As for me, i use 1500WATTS genius inverter @24V,
4 pieces of 155AH used tellecomm battery,
8 pieces of 120W MONO solar panels and i intend adding 2 more soon
and recently a 60A tristar MPPT.
I use it to power
1 40in LCD for more than 12hrs daily,
2 ceiling fans for aprox 16hrs,
4 20W bulbs for aprox 10hrs
and a 300W fridge(4 to 5 hrs daily)
I hope this answers some of ur questions...you can as well see pics of my set up.

George_D: bodejohn,

yeah. unfortunately as much as i'm loathe to admit it, sukam seems not to be as rugged as i thought.

and, don't be in too much of a hurry to jump on cyberpower. it has its own issues too, and believe me
they are too numerous to enumerate here.

fikfik: My current installation:

5KVA CyberPower PRO
HIGH POWER 200 amp/10hr batts x 16
Joy Solar 260W Polycrystalline x 8
eTRACER 60 Amp MPPT Solar Charge controller

bodejohn: Your connections on paper are correct and if you checked each string individual, I will advise as below

1. Connect each string individually to the charge controller and note your findings.
2. What charging mode was the controller? Bulk, Absorption or Float? If the batteries are full, the CC should ignore the excess power.
3. What was the average power in kW that you generated from the old 3 panel set?
4. Did you do this on a cloudy day or was any part of the panel covered by nearby trees?
5. If your Multimeter can measure DC current, try to measure the Isc of the panels

From my experience, if your batteries are full, your charge controller will ignore excess energy from the panels, sometimes at 2pm one of my charge controllers shuts it current to 0.0Amps even under load. You can kick in some power equipment like water pump to be and see if the power generated will increase.

bodejohn: I have replied you.

Yeepeee!!! I have been "unbanned".

bodejohn2005: I got banned by the spy-boot yesterday while i was trying to respond to this.

I meant to say kWh but I still stand by my statement, it is completely impossible to get nameplate power from your panels for 7hrs, you cannot even get it for 1hr continuously. The best i got from my 2.7kW array was 8kWh on a completely cloudless day.

bodejohn: As I said earlier in my first response, you need to design your system by diligent study, calculations and also taking into consideration some other site factors that are peculiar to your location, otherwise you will need professional help.

For example, where I stay, I have not received more than 3 times my solar array capacity in a day. This has helped me to plan my capacity increases and manage my expectations. Expecting 10.5kW from a 1.5kW installation will be ambitious.

abunafiu: pdozie....from my personal experience... i suggest u revert to 2 by 2 config for best results with ur morning star mppt. so only one more 250w panel u need now before any major upgrade. refer to my recent post on my upgrade for confirmation. tx.