₦airaland Forum

@ ojesky

150ah 24v
Isn't 24v supposed to be two batteries? Or you have two 75ah batteries?

ojeysky:
If you can push things up to 1500w then you should be fine. This ofcourse depends on your continuous consumption during charging as well.
I have a 1500w setup and my 150ah 24v setup becomes full by noon at the latest; in most cases it's full by 11am.

That's about 3 hours(8-11) sunlight for 150ah on 1500w.
So 10 hours(8-6) sunlight for 400ah on 1500w should truly do it. What is the make and model of your inverter pls? And make(name) of panels. I learnt there are so many stickers out there. ie you may be given panel of flames but fraudulently labelled sharp.
And don't I need to consider loss along wire from panels to cc; length of wire from panel to cc is 25metres.wire size is 6mm² though I guess some of that loss will be eliminated by the time I install the expected mppt cc
Thanks.

ceaser:
400ah 24v will give you a good run time close to the 4 hrs you seek but I'm not sure the 600 watts panel will adequately charge the batteries to full before sundown.

The gurus here will give more expert opinion[sub][/sub][sup][/sup][img][/img][font=Lucida Sans Unicode][/font].

I'm getting additional two 150watts panels before December.
Will someone pls tell me how many watts will charge 400ah battery conveniently in a day with 12v inverter and as an alternative, with 24v inverter. I am yet to grasp how to do the calculations.

400ah battery.
Whatever panel wattage that will charge it in a day
12v or 24v inverter?
That's my dilemma now

ceaser:
3.5kva inverter for a 140 watts freezer may be an overkill. With me, a 2kva 12volt inverter handles a 114 watts deep freezer adequately. In fact the freezer had hitherto done fine on a 12v 600 watts (1200watts surge inverter) with occasional at most twice weekly surge hiccups - the reason why I upgraded the inverter to a 12v 1200 watts (2400 watts surge variant).

The panels handling the set up are 4 pieces 150 watts flames all in parallel with a 30 amps PWM charge controller (to be upgraded to MPPT soon).

The battery is 100 amps (trans-over from one of the spent batteries for the home entertainment system modular set up).

The positioning of the panels are not optimal because of steep roof angle but by 9am when the sun is up, the freezer starts and the output from the panels fluctuates btw 90watts to 114watts. By midday up to around 5pm, the output ups to around 295 watts to 380 watts and the battery remains at optimal charge all these period.

6pm the inverter is programmed to shut down (the battery isn't so perfect for longer run time), but the freezer keeps items frozen till the following day.

These are the performance this rainy season. I expect better during the dry seasons.

You don't mean it! My panels are configured like yours 4×150w in parallel but I use a 60a pwm cc. I am also expecting a 60a powermr mppt cc. My inverter is luminous 12v 900vac ecovolt.

Pls what's the make and model of your inverter. I am looking at future upgrade is why I need the 3.5kva. But I can hold on for now.

[quote author=ojeysky post=82274277]As penuelseun hinted, it means 6 panels connected in series. When you connect in series you get increased voltage across panels but the current is constant. I am able to do that because my inverter allows high Voc up to 450 (with spikes to 500). However when you connect in parallel you get increased current (amperage) but constant voltage. There are ofcourse disadvantages in doing many series connection most especially the "injury to one is injury to all" syndrome, but if you have the bandwidth then I'd say it's much better.

That said it is called an hybrid in this context, because it has inverter (which does the conversation from DC to AC (not the other way round) ) and solar charge controller together in one box.

Note that not all hybrids are high Voc and I only got this model on choice and yes if the inverter gets to its normal operating Voc (which is 230) it can power your household without batteries. I am currently using the minimum panel setup hence am not yet at 230v not that I will need it though since I have batteries. [/quote

Niw i understand. Thanks for educating me.

Penuelseun:
He is talking about solar panels, his inverter is an hybrid that can convert high voltage DC from solar into ac in the absence of batteries, his 6s1p configuration will able to generate well over 180vdc(solar power) to charge his inverter which I think uses 24v batteries

Pls expatiate.
Do you mean 6 panels connected in parallel?
What exactly is this 6s1p?
My understanding of hybrid inverters is that they have inbuilt cc and are built for both phcn and solar thus the name hybrid. They can be used directly to ac load and only need batteries as storage for sundown use.

Hybrid inverters operate bi-directionally, meaning they can convert DC power from modules to usable AC power and then convert stored AC from the batteries to power loads when needed.

I won't mind a drawing of this 6s1p if it is not much bother.




PS: Why did I switch from science to study accounting!!! Do you know any sec school that will enrol this old man? Lol

Pls critique this proposal arrived at because of mismatched batteries.

Changeover is used to determine which cc to switch to and ultimately which battery to charge.
Changeover also determines which battery to place load.

Questions:
1. what is the negative implication of it.
2. If I am to incorporate dc fuse, which place(s) should it be?
3. The 40a cc has exceeded its max tolerance limit of 580w by 20w(4×150w=600). 60a is within limit.
4. Suggestions.

Thanks.

I looked it up and this is what I get.



A 2S2P battery (a battery is more than one cell) is made up of four cells in series/parallel configuration. If a 8000mAh battery has four 4000mAh cells of 12V each. Cell 'a' and cell 'b' would be connected in series to give 24V at 4000mAh capacity and the same will be done to cells 'c' and 'd' to give another battery of 4000mAh capacity at 24V. These two 24V batteries (ab) and (cd) are then connected in parallel to give one single battery of 8000mAh capacity at 24V.


This is my understanding until I began to wonder how 6s1p is connected.

6s1p will be= a, b, c, d, e, and f connected in series first and then (abcdef) connected to (d) in parallel? What is the resultant voltage if the batteries are 12v?

So since bigger capacity is our goal in solar, we can use our ingenuity to increase capacity but while doing so must not exceed voltage of inverter as it is already fixed based on what we opted for, 12, 24, 36, 48, etc.

[quote author=ojeysky post=82264454]Pls educate me. 6S1P is 6series 1parallel configuration, right? Is your inverter 72v, hence the additional 12v in parallel? Sorry I am a learner.

Pls recommend a good inexpensive 2.5kv inverter. Money IS an issue but would prefer to wait extra to save up than buy junk

mctfopt:
That will be better than a 12v system considering you plan on acquiring more panels since there is the need to add a refrigerator to the mix.

I shall think towards that area.

kiekie1:
Solar is life .. Fully off-grid for 4 months counting now .... Happy Sunday dear forumites !!!

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081-350-31951

1880w in a day?

mctfopt:
I'll recommend you get a 24v inverter system so you can push above 800w panel if you get your hands on a 60A MPPT Solar Charge Controller. 12v system heavily restricts you in the case of running any load greater than 100w. I always suggest you use a 12v system for extremely light loads especially bulbs and phone charging. To enable you run more solar panels you've got to think about getting off the 12v system.

So I should go for the 24v 2.5kva inverter rather than the 12v 1.5kva? Been thinking to go for the 12v 1.5kv

The battery level/voltage reader I installed

Hmnn. There is so much to learn about this DIY stuff. The challenges I had with my solar installation was simply due to wrong settings on the pwm cc. I give God the glory for giving me the insight on what to do. And I am grateful to all who gave me advice one way or the other for me to arrive "here". As of this day, I have had power for 72 hrs nonstop except of course when I go to sleep. I consulted extensively on different platforms, but I didn't get that settings could be the problem. I don't know what made me decide to change the settings. I think its because my battery came with 11.7v. So it occurred to me to reduce the voltage of the cc without really understanding what I am doing. All i thought was "if i reduce to below the battery voltage, maybe it will be forced to pick up". I also adjusted some other settings and voila! Light 24hrs. TV morning till evening with only a 200ah battery! And the battery only dropped to 85% once!
If I had contracted the installation out with money that is not available, I won't know what I know today. Still, I am glad I opted for DIY.

Thank you all who helped one way or the other. God bless you all.

mctfopt:
You can use an external charge controller on a hybrid inverter. All you have to do is to ignore connecting the PV wires to the inverter's PV slot but rather connect it to the external charge controller's slot. I still don't understand why you should connect the 4 panels in parallel, are you running a 12v system while using a PWM charge controller? If your inverter's capacity is up to 1.5kva, it can handle most fridge in the market that is 200w or less. I was banned by the anti-spam bot yesterday in this section for reasons best known to it. I'm back.

Sorry for being banned. It happens.
My inverter is indeed 12v so I cant connect in series to avoid ending with 24v connection. My inverter capacity is 900v so it can't carry the fridge hence my quest for a new one.
If I ignore the "follow come" cc, then I can buy the 1.5kva (which is same 12v) connect to mppt cc to power my fridge and other appliances. I will buy one more 200ah battery and 4 more panels.
Then remove two mismatched panels, take this present inverter and pwm cc and mismatched panels and install for my mother. Two panels and 100ah battery is okay for my mum. She hardly watches TV, but needs power for light and phone charging

wayisshut:
PLEASE HOUSE VERY URGENT . I NEED A 7.5AH 12 VOLT RECHARGEABLE BATTERY TO BE USED FOR AN ENERGISER. I NEED A BATTERY WITH AT LEAST A 1 YEAR WARRANTY. IF YOU HAVE ANY JUST MENTION ME.

Go to people selling generator. What you require is the battery used by kick and start generators.
Mine is dead and I am also planning on buying a replacement but replacements are not as good as follow come, I heard.

@mctfopt.
If I am correct, my present panels at 8a×4=32a in parallel has exceeds the capacity of the 50a pwm cc in it. And I still want to get 4 more panels. I am expecting a 60a mppt powermr cc. I know that will work with my present inverter but I am concerned about my fridge(inverter capacity can't carry fridge) Transformer in our area has been down for months now so fridge is redundant now.

Question is will the new inverter still need the mppt cc you talked about as it already has its own being hybrid? Thanks