bigrovar:

Am with you her jazzman. When it comes to AC coupled system the 2 major approach is to get a gridtie Inverter. Or Micro Inverters. The basic element of both approaches are they by pass the need for a charge controller. The gridtie Inverter takes DC from your array and converter them in the fly to AC for use in the house. The excess is either sold to the grid where there is net metering or can be connected to an off-grid Inverter which can then charge a battery bank. SMA sonnybouy even has hybrid system where the gridtie can power the house and at same time connected to a battery bank which acts as backup should the sun drop lower than consumption.

In all gridtie basically converter DC from array straight to AC with ability to "sell" or divert the excess electricity to another use eg charge battery or use for heating water.

Micro Inverter are tiny inverters attached to the back of a PV array. The convert the dc being generated into AC on the fly. Because a micro Inverter is connected to individual PV. They provide the best solution to shading on an array. Here only the shaded PV is affected since each PV has its own MI hence a single panel can't bring the system down. And because the electricity is sent in high voltage you get less wiring lose. Micro inverters can also be configured to sell excess electricity to the grid or used up for charging a battery bank or diverted to heat water.

The advantages of the above approache is there cut the waste off-grid can lose close to 45% of generated electricity to losses from wiring, battery to Inverter. Loses you don't get with an AC coupled solar setup.

The future of renewable is hybrid systems which are smart can generate AC on the fly and backup excess to battery or feed back to the grid.

pranil:


Very nice .Also look at pVOUT.org since you have the data already . It keeps much better records and allows you to compare with another systems ( although nobody except me from Nigeria )
https://pvoutput.org
Have you looked into MQTT and NODE red where it will also allow you to control loads using a Raspberry Pi - say when Battery is full allow AC to run. C

JUO:
Fangpusun 80a-12/24/36/48/60v=175k 70a-12/24/36/48v=105k 60a-12/24/36/48/60v=155k 60Da-12/24/36/48v=125k 50Da-12/24v=70k 50a-12/24v=55k 45a-12/24/36/48v=80k 30a-12/24v=35k Mppt control=20k
Epsolar 40a A series -12/24v=65k 30a A series -12/24v=47k 30a CN series -12/24v=35k Mt50=17k
Battery monitor Dc-6-100v=10k AC-220v=7k
DC breaker 125v-3k
Digital timer din rail 220v/16a=7k Contact me for pick up

DMerciful:
All

Contact me for the following products

40A 12/24v output 100v solar input MPPT Epever-65k
50A 12/24v output 100v solar input MPPT Fangpusun blue controller-70k
60A 12/24/36/48/60V output 150v solar input Fanfpusun controller-160k
12/24V battery balancer-14k

see my signature for contact details

chris81964:


A grid tied inverter is not illegal in Nigeria. Feeding back to the grid is what is not allowed. You can use a string inverter / grid tied inverter that works in conjunction with your battery inverter. They are called AC coupled systems. All the production is consumed or used the charge your batteries. The Battery inverter has to be able to do frequency shifting for it to work. There are a few people within this forum that do it using SMA Inverters and have yet to kill anyone.

pranil:


How many of those installations were inspected by NEMSA- http://www.nemsa.gov.ng/home/index.html?
How many inverter manufacturers can give you certificate that they can follow the grid and distribution code set by NERC - http://www.nercng.org/index.php/component/remository/Codes-Standards-and-Manuals/orderby,4/page,2/?Itemid=0
(Btw Grid code for Solar PV installations is yet in making and not published yet )

In SMA's case they have a software called grid Guard But any changes in Grid Guard require separate authorization -
http://en.sma-sunny.com/en/service-tip-how-to-change-grid-parameters-for-sma-inverters-in-sunny-explorer/

Most of the inverter manufacturers will recommend a separate utility meter to detect feedback power and a islanding relay
In all countries Grid connected inverters must pass separate certification to ensure they do not compromise the grid - https://www.victronenergy.com/transfer-switches/anti-islanding

Since the inverter density is very low in Nigeria you have not seen any incidents yet . Or in big installation proper anti islanding has been applied . Wait till one in every ten households starts putting PV inverters

jazzman2:


My Oga Pranil, you are getting it all wrong: Everything we are trying to explain is the use of grid-tie inverters via AC coupling in an OFF-GRID solar system. You are completely isolated from the "national" grid and all the codes and government certifications you are quoting are not applicable here. You create a "micro-grid" within your house with a battery-based bi-directional inverter that tricks the grid-tie inverters to continue to "pump their juice" into your load network. Grid-tie inverters are current sources and will dump 100% of their available power into the micro-grid. Excess energy that is not consumed by the load is routed in an un-controlled manner via the H-bridge bi-directional inverter into the battery bank. Once the battery voltage rises from bulk to the absorption level, regulation is required. You can simply switch off the grid-tie inverter and wait for the battery voltage to drop-off to a pre-determined level and restart the grid-tie or modulate the power coming from the grid-tie to maintain the battery bank at absorption level or divert excess battery or load current into a "dump load" . SMA and other grid-tie inverters like Fronius use frequency shift control (FSC) to modulate the grid-tie power level.The keyword here is : "grid-tie inverters in off-grid solar systems." A simple google search will enlighten you. Thanks.

dejidotun2000:
Good morning house. Please does Epever Tracer3210A have any relative advantage over Fangpusun MPPT100/30A. I realize that they are both mppt cc and that the Epever has a screen while the Fangpusun requires an external display. Is there anyone here who has used both and can make informed comments about their real life performance. Thanks

efuro:


thanks oga James (JUO)
for above price guide.

pls what app me when you have the ba3 desulphurcator I requested for last week.

thanks Sir.

pranil:


A grid is a legal term referring multiple energy sources connected together for distribution to multiple legal entities so when you call an inverter grid tie it means It is coupled to other energy sources which are regulated based on national laws
Infact based on your recommendation the first search of grid tie inverter brought me to wikipedia

https://en.wikipedia.org/wiki/Grid-tie_inverter

Quote " A grid-tie inverter converts direct current (DC) into an alternating current (AC) suitable for injecting into an electrical power grid, normally 120V RMS at 60Hz or 240V RMS at 50 Hz. Grid-tie inverters are used between local electrical power generators: solar panel, wind turbine, hydro-electric, and the grid.[1]"
In order to inject electrical power efficiently and safely into the grid, grid-tie inverters must accurately match the voltage and phase of the grid sine wave AC waveform.
Some electricity companies will pay for electrical power that is injected into the grid. Unquote

The emphasis is here again GRID-TIE - .
A simple google search will also take you to various manufacturers use of grid tie inverters recommendation and certifications for grid tie which specifically refers to connecting to local distribution grid

Please note that Grid tie inverters are not only frequency based control but they require a complex mechanism to detect abnormal grid conditions such as power swings and ramp rates which are different for every country . A grid tie inverter can also inject VAr into the system or disturb the static var compensations as well as contribute to harmonics

Just to make point clear about google I am not some D.i.Y enthusiast who has read on internet but a practicing consultant for more than 25 years and in renewables for more than 9 years for a leading German consulting company . I have advised utilities and private companies in many countries both in east and west africa on Power systems , renewables and sustainable energy . I use off grid system for my house as a hobby and out of necessity and constantly experimenting with it . But I am worried when people are not aware of the dangers the systems will try to take only partial knowledge and create problems down the line for the entire solar enthusiasts
If interested you can have a look at the publication coauthored by me for ministry of power on Nigerian Electrical system with emphasis on Renewables and rural electrification
http://www.energyplatformnigeria.com/images/Library/Energy_Sector_Study_(2nd_Edition)_-_GIZ_NESP_2015.pdf
http://www.energyplatformnigeria.com/index.php/overarching

Every responsible inverter manufacturers will tell you that in places of weak grid like Nigeria Grid tie or even AC coupled systems are bad idea . It can lead to instability , flickers and other unanticipated issues .


See the attached snipped from official victron user forums where Victron has replied to exact same question -
https://www.victronenergy.com/live/ess:design-installation-manual

P.s. I am not stopping people from using the grid tie inverters just let them be aware that there are both technical and legal pitfalls ahead of them specially when Grid tie inverters cost much higher than offgrid /hybrid inverters and have lower overall efficiency in a typical residential house with battery backup .( converting solar DC to Ac and then back to DC to charge the batteries) . Unfortunately due to severe requirements placed on them because of grid tie they turn out to be more reliable and durable then typical offf grid inverters and hence preferred even for off grid

pranil:


The emphasis is here again GRID-TIE - .
A simple google search will also take you to various manufacturers use of grid tie inverters recommendation and certifications for grid tie which specifically refers to connecting to local distribution grid

Please note that Grid tie inverters are not only frequency based control but they require a complex mechanism to detect abnormal grid conditions such as power swings and ramp rates which are different for every country . A grid tie inverter can also inject VAr into the system or disturb the static var compensations as well as contribute to harmonics.

cwoods2609:
hello house , pls I a question I have a 1.5kva 12v xantra inverter and a much power 2.4kva 24v hybrid inverter, I also have 10 100 watt solar panel. I want power my house total is 3 celling fan 10 energy bulbs 2 led tvs. am confused on which inverter I will be better of with, I have two 200amp battery I was told dat transformerless are not dat good on batteries and 2.4kva must power hybrid inverter is transformerless and xantra inverter is transformer Base

bigrovar:


Done all that. Problem is Nairaland is huge and is valued multi million dollars. Hence makes millions for it's owner monthly. All this off the back of content creators like us. The least that could be done is at least upgrade the system to 2017. I am a member of many forums from xda to power forums to solar talk. nairaland is the biggest and the one with the worst user experience. It's still based on simple machine forum when it should have moved to something premium like vbulletin which is what most major forum is based on. It's like having a billion dollars contract to deploy off grid solar but you did the job with sunshine solar panels + Roy solar pwm charge controller. That's the metaphor for how NL is being managed.

cwoods2609:
hello house , pls I a question I have a 1.5kva 12v xantra inverter and a much power 2.4kva 24v hybrid inverter, I also have 10 100 watt solar panel. I want power my house total is 3 celling fan 10 energy bulbs 2 led tvs. am confused on which inverter I will be better of with, I have two 200amp battery I was told dat transformerless are not dat good on batteries and 2.4kva must power hybrid inverter is transformerless and xantra inverter is transformer Base

zeestone99:


Bros use the 24v hybrid, i bliv it's a pure sine wave inverter. get a proper charge controller Mppt preferably(I dnt trust the controller embedded in hybrids) n u gud 2 go

jazzman2:


Oga, again you are going off-point. Your emphasis is GRID-TIE in its legal sense while my emphasis is GRID-TIE IN OFF-GRID SYSTEMS. Why are we all going around the bush here?? Nigeria is not ready for legal grid-tie systems yet, I know all that bla bla bla. However, grid-tie inverters can be utilized (and is being utilized in Nigeria) in completely off-grid systems: There is no legal grid to back-feed into and there are no certifications to submit to the govt. regulating bodies. There is no "accidental" back-feed to the grid if the installer knows what he is doing. That will be as stupid as an installer connecting a battery-based inverter to a 230Vac local transmission line. Am very sure he will not survive the fire-works (...joke..). If you want to counter my arguments, let it be based on GRID-TIE IN 100% OFF-GRID SYSTEMS.

In addition, the overall efficiency of AC-coupled systems are much higher than DC-based systems because the conversion is DC to AC and your load is 100% day-time AC. The battery backup is just an add on feature.

Thank you Sir.

efuro:


thanks for your commitment to solar. I also note that your prices are quite friendly too. this & your after sales advice will endear new enthusiast to you.

My respect!

cwoods2609:
Thanks for the advice, what is the best position to face solar panels east or west to get
best results

foonshur:

Thanks boss, but if you don't mind my asking... why will i use a "grid-tie" system to feed into an off-grid system, when a well setup off-grid system will do the job for me 100%. or am i missing something here?

cwoods2609:
Thanks for the advice, what is the best position to face solar panels east or west to get
best results

mcTrinity:
Good day house
please, I need Solar world panel or suntech... nothing less than 300w
price please...
thanks
cheers

mcTrinity:

none of the above.... best is south (a little bit tilted) Face it to the east, you'll only have optional performance during sunrise face it to west, you'll only have optimal performance during sun set... just my contribution
there are pros that can answer better thanks cheers

life707:
@George_D

We need to talk. Can't reach you.

cwoods2609:
hello house , pls I a question I have a 1.5kva 12v xantra inverter and a much power 2.4kva 24v hybrid inverter, I also have 10 100 watt solar panel. I want power my house total is 3 celling fan 10 energy bulbs 2 led tvs. am confused on which inverter I will be better of with, I have two 200amp battery I was told dat transformerless are not dat good on batteries and 2.4kva must power hybrid inverter is transformerless and xantra inverter is transformer Base

DMerciful:
This is exactly my thought....great advice.