samnaija:

the inverter is a 1 kva kevin inverter the charging current 30amps.when there is nepa the display shows about 225 volts entering the battery , the soc will try to reach 100% but does not get there till nepa takes light.always reaching 97%.about 13.8volts.. this is only when there is light. i want to upgrade to solar. and I want to make no mistakes. thnks in advance.

adrusa:



As to solar support, it will depend on how much NEPA do you get per day. What SOC/Voltage do you get to in a typical morning after overnight use. It is presumed that solar will charge your battery for about 4-5hrs on good sunny days. You can calculate how much solar you will need based on SOC/Voltage of your battery in the morning and what current (in ampere) will you need to put your battery back to full charge in about 5 hours.

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GeorgeD1:
dsunmade,

all high end inverters presently in the market will charge your batteries to float, i.e they have
a three or four stage charging algorithm already built into them.

these inverters include (but are not limited to):

1) xantrex
2) magnum
3) outback
4) sunnyboy (sma)
5) tripplite
6) exeltech
7) fronius
9) siemens, etc

earthrealm:


kevin brand?...sounds like a local inverter or indian etc..anyway...going by battery basics wch states minimum of 10% of ur power bank capacity if the the charging requirement...thus you need a n inver ter or charger that can kick out 50amps at 12v minimum.......best sef is one tht can do 70amp........using an external charge r isnt a feasible option.
either change ur inverter to >50amp 12v type or you change ur battery arrangment to a 24v 250amp bank...n then get a 24v 30amp inverter.
you shud b fine either way

oh i forgot....with ur present setup same thing applies...you wud need a cc/panel config to give you upto 50amps or best 40amps --gurus share ur views on this solar angle

adrusa:


The measured SOC is not extremely important. It does not always reflect the true state of the battery. It is at best an educated guess based on input and output Ampere-Hour. When the inverter "calculates" that it has returned the removed AH, it then registers that the battery is at 100% SOC. This is not always true. I will say dont worry too much that you are not seeing 100%. It doesn't matter too much. Your voltage of 13.8 is about right for a floating battery. What is important is what voltage do you get some hours after NEPA is off and not on load? What voltage do you get when the inverter is supplying power (on load) without NEPA?

About 13V (12.8-13.2V) is fine when the battery is at rest without NEPA or load after a few hours. When you put a load on the battery, you should start off with about 12.6V (12.4-12.7) depending on the load. If you are seeing less, you are either putting too much load or your battery did not get good charge.

In my opinion, it is something that you have to personally study to see if you are getting the best out of your batteries. You can only get generic advise here, but each inverter/solar system setup is unique. The voltages you will see will depend on your usage scenarios. Finally, what equipment you are using for your measurement will also affect what readings you are getting. You may need to calibrate your voltage reading if your inverter supports that. You will obviously need a good clamp metre to do that.

As to solar support, it will depend on how much NEPA do you get per day. What SOC/Voltage do you get to in a typical morning after overnight use. It is presumed that solar will charge your battery for about 4-5hrs on good sunny days. You can calculate how much solar you will need based on SOC/Voltage of your battery in the morning and what current (in ampere) will you need to put your battery back to full charge in about 5 hours.

samnaija:

this man you be wizard the values you stated are similar to my setup . the battery on nepa gets to 13.8v, but after some hrs without nepa drops to 13v. exactly as you stated. when i load on it drops to 12.6v. overnight usage till morning reads 12.2 v. thanks I was worried about the incomplete soc. but its time to upgrade to solar house. pls help 12v 500ah battery bank, what panel size do i need to charge this batteries adequately since a 60 amps charge controller will be used.

RipVanWink:
@samnaija..i still think ur best bet is to change ur 12v 500amp batt bank to 24v 250amp bank...just playing with series/parallel connections..........abi its just a single batt of 12v 500amp u have?!!!......wahala dey if so
its the same thing and ur runtime would still be the same.....that way you only need to get a good 24v inverter capable of pushing out 30amp.......same goes for the charge controller you intend to buy...45amp morning star hooked to 1kw 24v panels is ok...or 60amp epsolar cc hooked to 1.5kw 24v panels...........u dont really need an 80amp cc

samnaija:


thnks for response the battery bank comprises of (6 batteries) each 2v 500ah connected in series to give 12v 500ah.60amps cc and about (6 panels 250 watts ) thnks alot.

adanny01:

It doesnt add up.
6 x 2v 500ah gave you 12v 500ah? No i dont think so.
Its either
6 x 2v 500ah should give you 12v 3000ah
Or
6 x 2v 85ah should give you 12v 510ah.

Konnektions146:

Series connection- v1+v2=current remain same but voltage increases

Parrallel connection -- v1+v2=same but current increases

adanny01:


I dont think i mentioned current in my comment neither is it my context. Current in this case relates only to charge capacity of the inverter or external charger.

I will like to be practical, i have only seen inverters of 12v and above.

If samnaija has 2v batteries then he needs a minimum of 6 batteries in series which is exactly the configuration he has.

The matter i stressed is the Amp-hour (Ah) rating of his batteries and the total for the bank. Lets define Ah.

Wikepedia says Ah is a unit of electric charge, equal to the charge transferred by a steady current of one ampere flowing for one hour

Using that, if 1 battery of 2v has a charge capacity of 500Ah as claimed by samnaija, how much is the capacity of 6 batteries connected together? Whether connected in series or parallel, they all get charged by the same charger at the same or almost the same current. Are you saying that all of them cannot store up charge of more than the capacity of 1 battery? If thats the case, whats the point of connecting batteries together, he should have just gotten 1 12v battery.

Every battery holds its charge and contributes to the whole bank. If he really has 6 500Ah batteries connected in series or parallel, his bank capacity is 3000Ah.

Please i may not be an electrical engineer but i know the difference between current (A) and Amp-hr (Ah).

temizeee:
lwkmd ooo.... my oga it is true u are not electrical engineer ooo...... ..lolz

temizeee:
lwkmd ooo.... my oga it is true u are not electrical engineer ooo...... @ALL he is trying to say wattage of d setup either in series or parallel not amp rating....lolz

samnaija:


the battery bank comprises of (6 batteries) each 2v 500ah connected in series to give 12v 500ah.

adanny01:
The both of you temizeee and Konnektions146 should prove what you know from the quote below.



True or false?

temizeee:
hey baba nla
2v 500ah battery of 6 pieces is approximately 6kw bro. u can only use it with inverter in series which makes 12v at 500 ah..... diz are simple basics of battery configuration.....see bro all diz wiki research doesn't help most time...they will only confuse you. #wekeeplearning

adanny01:


Technically, you are wrong.

2v 500Ah batteries 6 pieces connected in series gives 12v 3000Ah. Did you answer that? No. I just wanted true or false and other stories you wish can be added.

You went further to convert to Kwh=(Ah x v)/1000 which no one asked you neither is it what samnaija made a mistake. In stating your result you stated it wrongly which on a good day may pass off as a typo but in this case you went too far missing an important unit. Thats what diferentiates me and others.

6Kw is not same as 6Kwh which is the correct unit.

36Kwh is your answer.

Besides that you still maintain the bank is 12v 500ah that gives you wrong answers. Ah is not the same as current A. Stop confusing yourself.

samnaija:


thnks for response the battery bank comprises of (6 batteries) each 2v 500ah connected in series to give 12v 500ah.60amps cc and about (6 panels 250 watts ) thnks alot.

Barezzi:
Calm down Adanny01, see the post above me.

Konnektions146:


Brother,

I really don't know how to write plenty but see the attached diagrams if it makes any sense to you.

If not, i will try more so we learn together

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Barezzi:
Seems its affecting my daily average harvest...
Might have to pour some water on the panels.