₦airaland Forum

Best connection is 2 by 2 ie series-parallel.

xreakz:
Voc = 37.33V
Vmp =29.81V
Ioc =8.93A
Pmp=250W
I want to connect 4 solar panels of the rating above in parallel to get as much current as possible. Is it a good setup?

Battery to be connected in a 24V setup
2v 500Ah Gel
Max Charging current is 100A
Float is 2.23V
Cycle is 2.35V

DMerciful:
Best connection is 2 by 2 ie series-parallel.

What would be the total Vmp and Ioc i would get from the 2 by 2?

[/quote]

xreakz:
Voc = 37.33V
Vmp =29.81V
Ioc =8.93A
Pmp=250W
I want to connect 4 solar panels of the rating above in parallel to get as much current as possible. Is it a good setup?
Battery to be connected in a 24V setup
2v 500Ah Gel
Max Charging current is 100A
Float is 2.23V
Cycle is 2.35V

Depending on the charge controller you are using.

1) if it's 24/48v CC, then 2 x 2 is ok.
This should be atleast 25A

But

2) if it's 12/24v CC, then all 4panels should go parallel. This should be atleast 40A

life707:
Voc = 37.33V
Vmp =29.81V
Ioc =8.93A
Pmp=250W
I want to connect 4 solar panels of the rating above in parallel to get as much current as possible. Is it a good setup?
Battery to be connected in a 24V setup
2v 500Ah Gel
Max Charging current is 100A
Float is 2.23V
Cycle is 2.35V


Depending on the charge controller you are using.

1) if it's 24/48v CC, then 2 x 2 is ok.
This should be atleast 25A

But

2) if it's 12/24v CC, then all 4panels should go parallel. This should be atleast 40A

Okay.. But how does the CC affect this? I be noob no vex

Voltage will be time 2. Current depends on the type of charge controller...mppt double d current if you were using one

xreakz:
What would be the total Vmp and Ioc i would get from the 2 by 2?

xreakz:
Okay.. But how does the CC affect this? I be noob no vex

Your panel specification for voltage is 30volt and if you connect two panels in series, you will get a total of 60volts. Now if you connect the total of 60v to a CC that is meant to take 24-32v, what do think will happen?. It will shut down my dear.

Also, the Amperage matters. If you connect the four panels in parallel, the total max Amp from the four panels will be 8.93 x 4= 36A. Now if you use a 30A/ 24v CC, on a sunny day, the cc will park up and also there is no allowance for % efficiency. Meaning the cc is not 100% efficient ( most around 80%). So an extra 20% rating of your total expected Amp should be used in sizing your cc.

Gennextech:
good morning house , we have had a downward review in prices, we are grateful for the patronage from this forum.
everything goes at this price, high quality canadian solar panels can be gotten at 64,000

Hello hope u r good. I need a 3.5kva or a 5kva solar panels with inverter. Wat is the cost.? I need ur reply

I need this urgently please. I need a 3.5kva or 5kva solar system. I am starting from the scratch I want to power my deep freezer, just one. No Air-conditioned system. What's d total cost of each cos am starting from d scratch. During weekends am always at home though not everytime. I need a analysis of wat it will cost me.
Cc Dmerciful. @ Kimmie

Cc juo Juo

Cc Bigrover

Cc CcOguomo

nasonaso:
I need this urgently please. I need a 3.5kva or 5kva solar system. I am starting from the scratch I want to power my deep freezer, just one. No Air-conditioned system. What's d total cost of each cos am starting from d scratch. During weekends am always at home though not everytime. I need a analysis of wat it will cost me.
Cc Dmerciful. @ Kimmie

Cc juo Juo

Cc Bigrover

Cc CcOguomo

Analysis

With all due respect sir, kindly review previous analysis..then ask questions based on your findings.
Be blessed sir.

bigrovar:
depends on the starting and rated load of your freezer. My freezer is about 150w on running. Load. Starting load is about x 5 of that. Once it's kicking the running load reduces to 120w or there about.

Hello Boss, I mentioned u I may need ur response pls

abunafiu:
Analysis

With all due respect sir, kindly review previous analysis..then ask questions based on your findings.
Be blessed sir.

Thank u sir,
I do understand you are trying to help. I have a time frame to do this. Ur boy is very busy juggling alot on his desk. It's not taskin for me to do it. Just am swarmed n ve less space to accomplish it.

abunafiu:
Analysis

With all due respect sir, kindly review previous analysis..then ask questions based on your findings.
Be blessed sir.

Thanks boss
I got a quote of about 1 million for d 3kva complete solar system I need to power mY freezer, lighting points decoder n my led TV. D installer gave me a price of 35k for solar controller. I was thinking d higher d kva d higher d price of d solar controller. I do not no if am right

nasonaso:
Thanks boss
I got a quote of about 1 million for d 3kva complete solar system I need to power mY freezer, lighting points decoder n my led TV. D installer gave me a price of 35k for solar controller. I was thinking d higher d kva d higher d price of d solar controller. I do not no if am right

sir, there's no fast way out. You risk being confused and making d wrong choices. kindly avoid such mistakes by reading previous analysis. or better still higher a professional...u will get results in few minutes. consultation fee go dey ooo.
Bigrovar, I remember how long it took you before u took the 1st step. you were never in a hurry. today u are better informed.

nasonaso:
Thanks boss
I got a quote of about 1 million for d 3kva complete solar system I need to power mY freezer, lighting points decoder n my led TV. D installer gave me a price of 35k for solar controller. I was thinking d higher d kva d higher d price of d solar controller. I do not no if am right

35k ??

kiekie1:
35k ??

It's probably a PWM type

kiekie1:
35k ??

Yes boss
I am somehow confuse oh. I nor understand again. "Now Make money full everywhere" I don't intend throwing it to non profitable venture oh. I need value for my money

You don't need 3.5kva for solar system to power just a fridege a d maximum load. Plan for 1.5-2kva. Solar panel of 250W*8 will cost you 520k, Charge controller@ 80k, inverter 1.5kva 50k, battery 200AH*4 @ 360k, installation 30k. This system should fix ur need wella

nasonaso:
I need this urgently please. I need a 3.5kva or 5kva solar system. I am starting from the scratch I want to power my deep freezer, just one. No Air-conditioned system. What's d total cost of each cos am starting from d scratch. During weekends am always at home though not everytime. I need a analysis of wat it will cost me.
Cc Dmerciful. @ Kimmie

Cc juo Juo

Cc Bigrover

Cc CcOguomo

DMerciful:
You don't need 3.5kva for solar system to power just a fridege a d maximum load. Plan for 1.5-2kva. Solar panel of 250W*8 will cost you 520k, Charge controller@ 80k, inverter 1.5kva 50k, battery 200AH*4 @ 360k, installation 30k. This system should fix ur need wella

Hmmmn! its absolutely wrong for you to publicly type installation cost like this. Its totally unethical because you didn't put into consideration; height of roof"storey building spec", type of roofing sheet"aluminium or asbestos", pro solar roof mount or locally fabricated profiles, complex load isolation which you suddenly meet in some houses now etc . 1.5kva would work but can't really charge 4/6 batteries(series-parrallel if its a 24v system) & you forgot asking if client was totally offgrid"dependent on solar system alone" or hybrid .. Considering futuristic expansion. if client can a bit afford 3kw / 3.5kva / 4kva inverter, its OK by me because on solar, clients keeps talking of expansion especially when the installation wasn't substandard ... Don't always relent on QUOTATIONS this days , simply task yourself by calling and discussing a bit to get good value for your money . Thanks ...

nasonaso:
I need this urgently please. I need a 3.5kva or 5kva solar system. I am starting from the scratch I want to power my deep freezer, just one. No Air-conditioned system. What's d total cost of each cos am starting from d scratch. During weekends am always at home though not everytime. I need a analysis of wat it will cost me.
Cc Dmerciful. @ Kimmie

Cc juo Juo

Cc Bigrover

Cc CcOguomo

when it come to solar pls patient. ur location (north/south) also matter frm experience. pls on cost go for value for money. d 3kva i can install for N690, N980k can also be installed wt N1.6m. also this 3kva can also be packaged for N550k. so there's reason for d prices.
as advised pls go through old post here. it wl do u good

nasonaso:
I need this urgently please. I need a 3.5kva or 5kva solar system. I am starting from the scratch I want to power my deep freezer, just one. No Air-conditioned system. What's d total cost of each cos am starting from d scratch. During weekends am always at home though not everytime. I need a analysis of wat it will cost me.
Cc Dmerciful. @ Kimmie

Cc juo Juo

Cc Bigrover

Cc CcOguomo

also frm experience those that value cheap cheap solar always hv problem. solar price determinants varies. go for d best, no compromise then enjoy

DMerciful:
You don't need 3.5kva for solar system to power just a fridege a d maximum load. Plan for 1.5-2kva. Solar panel of 250W*8 will cost you 520k, Charge controller@ 80k, inverter 1.5kva 50k, battery 200AH*4 @ 360k, installation 30k. This system should fix ur need wella

Here we go again. What calculations did you use to arrive at 2 kw in panels?
Did you do an actual analysis of his usage? How many Watt hours did you calculations account for?

chris81964:
Here we go again. What calculations did you use to arrive at 2 kw in panels?
Did you do an actual analysis of his usage? How many Watt hours did you calculations account for?

sir chris81964, exactly my point yesterday. The op should settledown and read old post to guide his analysis. He just confirmed my fear for him. He is now confused.
Without apologies this is why u observe many old time founding members of this thread hardly reply.
The op should sitdown and READ. A DIY person must be ready to do some research and then understand why he needs solar in the first place. What do u undrstand by 3.5KVA ?.

Oga if u no fit do research, your money go waste.

Yea,i like the responses to the question asked thus far.So far the answers proferred by our Solar gurus are encouraging and enlightening.

Moral lesson:No hurry in life,Learning is gradual,not instantaneous.
One love all

People make solar solutions so expensive that potential users are scared to even attempt it. Solar system is modular in nature and as such can always be expanded worst case you sell some components and buy a bigger one but the panel itself is easily expandable. And the system I gave him is based on my system I installed myself and its working well.

kiekie1:
Hmmmn! its absolutely wrong for you to publicly type installation cost like this. Its totally unethical because you didn't put into consideration; height of roof"storey building spec", type of roofing sheet"aluminium or asbestos", pro solar roof mount or locally fabricated profiles, complex load isolation which you suddenly meet in some houses now etc . 1.5kva would work but can't really charge 4/6 batteries(series-parrallel if its a 24v system) & you forgot asking if client was totally offgrid"dependent on solar system alone" or hybrid .. Considering futuristic expansion. if client can a bit afford 3kw / 3.5kva / 4kva inverter, its OK by me because on solar clients keeps talking of expansion especially when the installation wasn't substandard ... Don't always relent on QUOTATIONS this days , simply task yourself by calling and discussing a bit to get good value for your money . Thanks ...

Oga...he mentioned my name and I responded havinh done a similar system for myself and its working fine. I don't want to bore him details..... You can respond to him if you want to help rather than criticise me

chris81964:
Here we go again. What calculations did you use to arrive at 2 kw in panels?
Did you do an actual analysis of his usage? How many Watt hours did you calculations account for?

Quality doesn't necessarily mean price but the quality of the design. At the same time all solutions must have a higher cost-benefit comparatively to make if the right choice.

idsolar:
also frm experience those that value cheap cheap solar always hv problem. solar price determinants varies. go for d best, no compromise then enjoy

DMerciful:
Quality doesn't necessarily mean price but the quality of the design. At the same time all solutions must have a higher cost-benefit comparatively to make if the right choice.

in solar quality/good design matter then pair good money with it. ur above advise cost is N1,040,000 (one million, forty thousand only). on any scale for solar u spend money. but pls get value. shikena

Nasonaso...kindly analyse the post below by bigrovar..


I have very little electrical background coming mostly from IT. The idea is to have a very small offgrid system which will power essential appliances in my house. Basically Home Entertainment system and Lights. I knew for a long time that my future would be renewable and to prepare for this, I gradually installed energy efficient 8w philips bulbs in my house. I also have a 43inch LED tv, a 1100watt 5.1 sound system, a laptop acting as a media center, and a dstv satellite reciever. From my estimate my total load for this system would be Max 600w. I have 90% of the component I require for this project which I intend to DIY with an electrician friend who will assist with grounding and other areas. I would appreciate if all the gurus can looking into my plan and point out areas I can makde improvements etc Design: PV I have 2 240w polycrystalline panels with the following specs VMP=30.1 IMP=7.78 I intend to have the panels mounted on the ground. Reason for ground mounting are as follow: * South facing part of my roof is completely shaded by 15:00 till sun set. (This is pretty much the main reason) * Since it is a rented apartment, not comfortable with tempering with the roof *Easy access to panels to carry out cleaning (Abuja can be very dusty) and ease of removal in case I leave the premise * Phobia for height Wiring, Distance and Losses The estimated length of wire which would be required to the power from PV to CC should be about 60feet. Hence I intend to connect the panels in series to reduce resistance and allow me use a 6mm cable with estimated loss of 3-5% (depending on the weather, position of the sun etc). I plan to use 10mm between the controllers and the batteries and batteries and inverter. Charge controller 3215RN Epsolar MPPT rated at 30A Batteries: 2 200AH SMF Sukam (I know I know - But it is what I could afford) Deep cycle batteries, connected in parallel Inverter 12v Sukam 1050v falcon plus inverter: would of loved to use something more industry standard but had to keep the setup within my budget. The falcon plus seem to be the best option availble to me (from all the low end inverter models out there) and here is why. It has built in temperature sensor for ATC and a SMPS for power factor correction and does the "6 stage charge" at least according to this review http://upsinverterinfo.com/su-kam-falcon-plus- inverter-unbiased-indepth-review.html It also could work in low current between 90v -240v. Anyway based on my budget it was what I could afford. Charge current = 14A Protection and Safety: I put a 10A Cbi vdc breaker between PV and CC, a 40A Cbi vdc breaker between CC and Battery, and a 63 vdc Cbi Breaker between Inverter and Battery. I also intend to put a 15A AC breaker between Grid and Inverter and a 20A AC breaker between Inverter and Load. I also intend to ground all the equipment from the panel frames to the panel, cc and inverter. Infuture and close to raining season I hope to get a thunder arrestor I intend to have all the load the inverter would be powering to terminate to a separate DB from the main house DB. This is meant to reduce issues of overloading the Inverter since only the load to be powered by the Inverter will be terminated to the inverter nothing more. Run time: I intend for the backup time for the system to be 6 hours. My max load is 450w.. lets say less than 500w * 6 = 3000 / 12 = 250ah. Because I have a battery bank of 400ah. I hope to ensure I don't pass the 62.7 state of discharge. considering that I will not be running all the loads at the same time. I expect the state of discharge threshold to be close to the 50% mark. When am out during the day, I might consider running the freezer with a timer based plug and set it to run between 12-14:00 depending on the weather. What I have: CC, Breakers, Panels,Inverter, Cables. What am expecting: Ordered 10 mc4 connectors from Aliexpress, a Killawatt meter, an MC4 Crimping tool and MC4 disconnect wrench. I hope to start the setup and installation once the tools arrive. There is pretty much my solar plan. I would appreciate if all the gurus look through and point out mistakes and suggestions.

I love the response given to d question, my Oga Abunafiu ,u hit d nail on d head well well o, kiekie I sight u, Oga Chris long tym. and who said solar is not expensive, my advice calm down do ur research and spend well on ur solar project, no rushing.

If you are looking for cheap solar components. at least research why ure making ur choice.

bros, eyes don see oo..from panels to controllers and ultimately batteries. no be all our mistakes we dey post oo..
nasonaso , I hope I have shown you a clear path..d ball is in your cct

abunafiu:
Nasonaso...kindly analyse the post below by bigrovar..



I have very little electrical background coming mostly from IT. The
idea is to have a very small offgrid system which will power
essential appliances in my house. Basically Home Entertainment
system and Lights. I knew for a long time that my future would be
renewable and to prepare for this, I gradually installed energy
efficient 8w philips bulbs in my house. I also have a 43inch LED tv, a
1100watt 5.1 sound system, a laptop acting as a media center, and
a dstv satellite reciever. From my estimate my total load for this
system would be Max 600w. I have 90% of the component I require
for this project which I intend to DIY with an electrician friend who
will assist with grounding and other areas. I would appreciate if all
the gurus can looking into my plan and point out areas I can makde
improvements etc
Design:
PV
I have 2 240w polycrystalline panels with the following specs
VMP=30.1
IMP=7.78
I intend to have the panels mounted on the ground. Reason for
ground mounting are as follow:
* South facing part of my roof is completely shaded by 15:00 till sun
set. (This is pretty much the main reason)
* Since it is a rented apartment, not comfortable with tempering
with the roof
*Easy access to panels to carry out cleaning (Abuja can be very
dusty) and ease of removal in case I leave the premise
* Phobia for height
Wiring, Distance and Losses
The estimated length of wire which would be required to the power
from PV to CC should be about 60feet. Hence I intend to connect
the panels in series to reduce resistance and allow me use a 6mm
cable with estimated loss of 3-5% (depending on the weather,
position of the sun etc). I plan to use 10mm between the
controllers and the batteries and batteries and inverter.
Charge controller
3215RN Epsolar MPPT rated at 30A
Batteries:
2 200AH SMF Sukam (I know I know - But it is what I could afford)
Deep cycle batteries, connected in parallel
Inverter
12v Sukam 1050v falcon plus inverter: would of loved to use
something more industry standard but had to keep the setup within
my budget. The falcon plus seem to be the best option availble to me
(from all the low end inverter models out there) and here is why. It
has built in temperature sensor for ATC and a SMPS for power
factor correction and does the "6 stage charge" at least according
to this review http://upsinverterinfo.com/su-kam-falcon-plus-
inverter-unbiased-indepth-review.html It also could work in low
current between 90v -240v. Anyway based on my budget it was
what I could afford.
Charge current = 14A
Protection and Safety:
I put a 10A Cbi vdc breaker between PV and CC, a 40A Cbi vdc
breaker between CC and Battery, and a 63 vdc Cbi Breaker between
Inverter and Battery.
I also intend to put a 15A AC breaker between Grid and Inverter
and a 20A AC breaker between Inverter and Load.
I also intend to ground all the equipment from the panel frames to
the panel, cc and inverter.
Infuture and close to raining season I hope to get a thunder
arrestor
I intend to have all the load the inverter would be powering to
terminate to a separate DB from the main house DB. This is meant
to reduce issues of overloading the Inverter since only the load to
be powered by the Inverter will be terminated to the inverter
nothing more.
Run time: I intend for the backup time for the system to be 6
hours. My max load is 450w.. lets say less than 500w * 6 = 3000 /
12 = 250ah.
Because I have a battery bank of 400ah. I hope to ensure I don't
pass the 62.7 state of discharge.
considering that I will not be running all the loads at the same
time. I expect the state of discharge threshold to be close to the
50% mark.
When am out during the day, I might consider running the freezer
with a timer based plug and set it to run between 12-14:00
depending on the weather.
What I have:
CC, Breakers, Panels,Inverter, Cables.
What am expecting:
Ordered 10 mc4 connectors from Aliexpress, a Killawatt meter, an
MC4 Crimping tool and MC4 disconnect wrench.
I hope to start the setup and installation once the tools arrive.
There is pretty much my solar plan. I would appreciate if all the
gurus look through and point out mistakes and suggestions.

Abeg what else do you want to know o, am sure most ppl like me have learnt so much from your question cum expose. Am not an authority in the field but, am very sure you have acts together in this...