chris81964:


So the difference in cost between a 40 A and 60 A is more than the cost of replacing his inverter.
Let me make sure I understand you. He already has an inverter.
You want him to forget his inverter and buy a 24 V inverter to justify buying a 60 Amp controller. Is this what you are asking him or her to do?

Please go through all my post as regards this matter.. kindly make your own suggestions.. thank you..

Dam5reey:


Please go through all my post as regards this matter.. kindly make your own suggestions.. thank you..

I read your posts. And I wanted to understand what you were asking him to do and why you felt it made logical sense.
I am not going to give a solution. Like a previous poster said. This topic has been covered many times before and he or she will be better served by reading through before taking advice from anyone.

earthrealm:


just compared with haier/lg/samsung.

beko rules them all, the kwh /year consumption is far lower than any of the makes.

Energy consumption (kWh / year) 308 --- beko 379ltr

Energy Consumption (KWhr/yr) 693.0 haier thermocool 379ltr

@kiekie, i dey vex for you o, why did you release this info weeks ago, when i told the house i was in the market for an energy efficient freezer!
this beko consumes less 50% what the haierthermoccol does

Pardon me .. I just remembered a client of mine who uses it and my watts meter results for such a big freezer left me smiling !

Dam5reey:


I did the analysis already... On previous posts.
He need 60A charge controller which would cost more that 40A MPPT.. it's better to have 24V 200Ah Bank than 12V 400AH..

U r correct that is y I advised him to sell his 12v n buy a 24v inverter. Even if he buys 60amps cc(price can buy a 40amps cc n 24v inverter) , wch is expensive, he won't b able to use more than 1kw(or a lil above) on the controller b4 it max out.
There ll b no panel upgrade. The pic below is a 60amps epever controller

zeestone99:


Yeah as d dollar keep falling we can only hope price gets better, to allow many of us upgrade our system

zeestone,
well done. keep up the good works. i only wish other sellers like solar depot, et al will toe this line.
i observed that most die-hard retailers are still hanging on to their old high price which they adjusted for
when dollar was selling for 450/500. now that dollar is trading below 370 their price adjustment mechanism
seem to have gone on sabbatical leave. which way nigeria?

chris81964:


I read your posts. And I wanted to understand what you were asking him to do and why you felt it made logical sense.
I am not going to give a solution. Like a previous poster said. This topic has been covered many times before and he or she will be better served by reading through before taking advice from anyone.

Alright.. same happened to me..

I was asked to start reading about 229 pages​ which might not aplicable in his case,
If anyone has time to answer the simplest​ question it's better to reply or leave the comment.. rather than say go through the thread, without referencing any page number..

Dam5reey:


It's possible.. with Epsolar MPPT controller... 40A.. however you will still loose power during peak periods..
Connect in 2 x 2 strings...

Option 2 buy 60A, 70A MPPT controller as I stated earlier.. 800Watts will generate Approx 60A at 13.8 float charge...

Thanks

See image below of what I'm settling for

40A mppt controller and also using a 32A DC breaker to limit the current flowing to the controller to avoid damage.

davodyguy:


Thanks

See image below of what I'm settling for

40A mppt controller and also using a 32A DC breaker to limit the current flowing to the controller to avoid damage.

Good from reviews the Epsolar has inbut over current limiting function..

Dam5reey:


Good from reviews the Epsolar has inbut over current limiting function..

You people don't kill me.

You mean I should forget the 32A breaker? And go for 50A?

davodyguy:


You people don't kill me.

You mean I should forget the 32A breaker? And go for 50A?

Modified.. what is maximum PV current...?
You can attached one of the panel specifications

GeorgeD1:


zeestone,
well done. keep up the good works. i only wish other sellers like solar depot, et al will toe this line.
i observed that most die-hard retailers are still hanging on to their old high price which they adjusted for
when dollar was selling for 450/500. now that dollar is trading below 370 their price adjustment mechanism
seem to have gone on sabbatical leave. which way nigeria?

Too many greedy Nigerians

Bought two 215/70/16 tyres today at same rate of 460 naira to a dollar.

I'm just upset about this

Dam5reey:


Modified.. what is maximum PV current...?
You can attached one of the panel specifications

I'm guessing that my panel 4 in number 200w produces about 7.5v

davodyguy:


I'm guessing that my panel 4 in number 200w produces about 7.5v

Alright one 200W cannot produce more than 9A.. so at * 2 string you will have 18A.. 32A circuit breaker is good.

Dam5reey:


Alright one 200W cannot produce more than 9A.. so at * 2 string you will have 18A.. 32A circuit breaker is good.

Wait o Dam

9*4= 36 and we are using 32A.

Are my equipment safe?

davodyguy:


Wait o Dam

9*4= 36 and we are using 32A.

Are my equipment safe?

In DC breaker calculation, serial connection of panels differs from parallel connection ! If it ain't very clear to you, get an installer to assist you . Cheer's

kiekie1:


In DC breaker calculation, serial connection of panels differs from parallel connection ! If it ain't very clear to you, get an installer to assist you . Cheer's

You're right.

There's limit to where I can thread in this regard.

Of course did the inverter and​ connections set up myself, but wouldn't attempt to go solo in this regard

davodyguy:


Thanks

See image below of what I'm settling for

40A mppt controller and also using a 32A DC breaker to limit the current flowing to the controller to avoid damage.

How do you intend limiting current flowing into your 40a mppt with the 32a DCB ?

kiekie1:


How do you intend limiting current flowing into your 40a mppt with the 32a DCB ?

So says the engineer I enquired from and got that advise.

davodyguy:


So says the engineer I enquired from and got that advise.

Hmmn , its rare to see an experienced solar tech - engineer give such advice unless if you meant mechanical/civil engineer .. If DCB ratings limits currents , my friend > George D would keep climbing into his ceiling to switch on tripped breakers in his pv combiner box on weekly basis

kiekie1:


Hmmn , its rare to see an experienced solar tech - engineer give such advice unless if you meant mechanical/civil engineer .. If DCB ratings limits currents , my friend > George D would keep climbing into his ceiling to switch on tripped breakers in his pv combiner box on weekly basis

See below our WhatsApp chat

[6/11, 21:36] ‪+234 ‬: I am Engr. FREDRICK
Major in Electrical power and machines

[6/11, 21:56] ‪+234 ‬: But if that seems too expensive then you use a 40A mppt controller but make sure u also use a 32A DC breaker to limit the current flowing to the controller to avoid damage.

davodyguy:


Too many greedy Nigerians

Bought two 215/70/16 tyres today at same rate of 460 naira to a dollar.

I'm just upset about this

my brother, it's just so disheartening. from solar products to tyres and even commodities the story is the same: artificially high prices totally at variance with realities on the ground.
unless they start re-adjusting these absurd prices downwards they stand to lose customers big time.

davodyguy:


Wait o Dam

9*4= 36 and we are using 32A.

Are my equipment safe?

Yeah.. a screenshot of your Panel specifications​ will help too..

I will make an assumption, say you have 30Vmp and Imp 6.7A

You connection will be
string 1 two panels in series(60 Vmp, Imp 6.7A)
string 2 two panels in series (60 Vmp, Imp 6.7A)

Connecting​ string 1 & 2 in parallel, will be ( 60Vmp Imp 13.4A)

The 32A Breaker is ok, but It will not limit current, breaker​ are like fuse, it work on same principle with Fuse but better, it will trip off in case of current surge

Dam5reey:


Yeah.. a screenshot of your Panel specifications​ will help too..

I will make an assumption, say you have 30Vmp and Imp 6.7A

You connection will be
string 1 two panels in series(60 Vmp, Imp 6.7A)
string 2 two panels in series (60 Vmp, Imp 6.7A)

Connecting​ string 1 & 2 in parallel, will be ( 60Vmp Imp 13.4A)

I'll post images tomorrow

As I said, I want to be guided, that's wh I am here

The already set up at home now

Is 1000watts inverter

2 nos of 200amps batteries of 12v each that I connected myself in parallel, to avoid over voltage to the inverter.

The solar system purchased now are as follow

4 nos Panels of 24v 200 watts each. Solar panels are made by Frames
We also acquired 40A MPPT charge controller, and was advised to get a 32A breaker.

What have we done wrong? And what can be done to remedy the situation?

Note, I'm very unwilling to get a 24v inverter for now, until I'm ready for a massive upgrade of say 4 to 4 200amps batteries and sinewave inverter

davodyguy:


See below our WhatsApp chat

That name sounds like somebody I know .. Guess u procured the items (panels , inverter, mppt) from him in Lagos Pls ensure its a DC breaker you are using and not an AC breaker ! Cheers

davodyguy:


I'll post images tomorrow

As I said, I want to be guided, that's wh I am here

The already set up at home now

Is 1000watts inverter

2 nos of 200amps batteries of 12v each that I connected myself in parallel, to avoid over voltage to the inverter.

The solar system purchased now are as follow

4 nos Panels of 24v 200 watts each. Solar panels are made by Frames
We also acquired 40A MPPT charge controller, and was advised to get a 32A breaker.

What have we done wrong? And what can be done to remedy the situation?

Note, I'm very unwilling to get a 24v inverter for now, until I'm ready for a massive upgrade of say 4 to 4 200amps batteries and sinewave inverter

The 40amps cc n 32amp breaker ll do the job. Carry on

GeorgeD1:


my brother, it's just so disheartening. from solar products to tyres and even commodities the story is the same: artificially high prices totally at variance with realities on the ground.
unless they start re-adjusting these absurd prices downwards they stand to lose customers big time.

I do not want comment but after thought I believe there is the need to appeal to marketers on the forum to scale down their pinned-product-prices. their is real competition out there.

taking good/standard panels for instance, eg. flames 150w poly/mono PV can be bought at N27k/N30k.
but here the cheapest is N35k

of course marketers will use their usual bla bla bla or alaba dis alaba that to justify their superficial profits on solar products.

however, some of us believe forum patronage will encourage marketers in our small community of solar to grow across length & breath of Nigeria.

so the forum should be seen as a place to give rebate (if that word is appropriate here) to members and not just the usual market place.

davodyguy:


I'll post images tomorrow

As I said, I want to be guided, that's wh I am here

The already set up at home now

Is 1000watts inverter

2 nos of 200amps batteries of 12v each that I connected myself in parallel, to avoid over voltage to the inverter.

The solar system purchased now are as follow

4 nos Panels of 24v 200 watts each. Solar panels are made by Frames
We also acquired 40A MPPT charge controller, and was advised to get a 32A breaker.

What have we done wrong? And what can be done to remedy the situation?

Note, I'm very unwilling to get a 24v inverter for now, until I'm ready for a massive upgrade of say 4 to 4 200amps batteries and sinewave inverter

that ur breaker looks like an ac breaker, if yes...using ac breaker in dc enviroments is not safe/good.

what his engineer meant by limiting current by circuit breaker is that, if the juice coming from his panels is over 32amps[max of his scc], then it will trip preventing damage to his scc.

am not in surpport of such a setup, cos if ur panels are sized properly, the issue of over current will not arise...n from the 250w x4 panels u have...case of excess current will not arise for a 24v system, but will arise for a 12v system...600w is max recommended for 12v system, thus you may wish to install only 2 panels if you still insist on 12v setup

earthrealm:


that ur breaker looks like an ac breaker, if yes...using ac breaker in dc enviroments is not safe/good.

what his engineer meant by limiting current by circuit breaker is that, if the juice coming from his panels is over 32amps[max of his scc], then it will trip preventing damage to his scc.

am not in surpport of such a setup, cos if ur panels are sized properly, the issue of over current will not arise...n from the 250w x4 panels u have...case of excess current will not arise for a 24v system, but will arise for a 12v system...600w is max recommended for 12v system, thus you may wish to install only 2 panels if you still insist on 12v setup

Ok thanks.

We can do 200watts X3 then to make 600watts rather than 800 watts( 4 X 200watts panels)

But I want to ask this question.

Presently, my 1000 watts inverter send 10 amps to each of my 200amps batteries after every one hour charge.

Let's assume that the sun shines properly from 10:00am to 3:00pm, that is 5 hours sunshine, How many amps would be sent per hour to the batteries to charge them?

cc
GeorgeD1
efuro
zeestone99
Dam5reey
kiekie1
chris81964

davodyguy:


Ok thanks.

We can do 200watts X3 then to make 600watts rather than 800 watts( 4 X 200watts panels)

But I want to ask this question.

Presently, my 1000 watts inverter send 10 amps to each of my 200amps batteries after every one hour charge.

Let's assume that the sun shines properly from 10:00am to 3:00pm, that is 5 hours sunshine, How many amps would be sent per hour to the batteries to charge them?

cc
GeorgeD1
efuro
zeestone99
Dam5reey
kiekie1
chris81964

My opinion is connect 800w, your​ controller will take as much power during cloudy time, and during peak periods current limiting function kicks in

From experience... The charge controller only draw what it need to charge your battery from the Panel... Assume battery is almost charge from float to fully charged, it will only draw small power regardless of the Panel watt output...

I have seen 470 Watts panel connected to 10A controller.. everything works fine.. just that battery will charge at close to 10A any time of the day from 9am till 4 pm...... during peak periods the remaining 220 watts is lost.. but will compensate​ during cloud..

we now stock ups and charge controllers please find attached price list

I got invited to a radio show "The Architect" FM 92.3 in Port Harcourt. The hosts Adaora Okoli and Daniel Braid had Ebi Bozimo and me on the show. Enjoy the Podcast.
http://atlanticwastepower.com/2017/06/listen-dr-solar-92-3-nigeria-info-port-harcourt-part-1/

davodyguy:


Ok thanks.

We can do 200watts X3 then to make 600watts rather than 800 watts( 4 X 200watts panels)

But I want to ask this question.

Presently, my 1000 watts inverter send 10 amps to each of my 200amps batteries after every one hour charge.

Let's assume that the sun shines properly from 10:00am to 3:00pm, that is 5 hours sunshine, How many amps would be sent per hour to the batteries to charge them?

cc
GeorgeD1
efuro
zeestone99
Dam5reey
kiekie1
chris81964

ok ur panels are 200w, not 250w..perfect then 200w x 3 in series shud be fine.
ur 600w 12v setup has the capabilty of bring 40/45amps...thus in real life factoring in losses from cabling, inclination and scc efficiency..you would be getting btw abt 35amps- 38amps max. for ease of calculation lets assume 30amps, the norm is to take 5hrs of sunlight daily, thus 5hrs x 30amps = 150amps, ur bank is 400ah, wch you can theoritically drain/recharge to 300ah, so you can see that ur setup can only supply 50% of your bank capACITY - THIS IS NOT IDEAL LONGTERM, unless your loads are light n u dont drain ur bank heavily.
A 24V 200AH SETUP IS A BETTER DESIGN from all angles panels utilization/harvest/batt charging/C/10 etc......

hope you are aware of the term sulphation and C/10? UR BATT BANK NEEDS 10% CHARGING CURRENT TO REDUCE THE EFFECT OF SULPHATION, THUS a 12v 400ah bank needs minimum of 40amps, SOME OTHER BATT TYPES ARE C/8