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Re: Solar Energy, A Complement To FTA by lat55(f): 10:21am On Dec 07, 2020
Good morning,

Thank you for your response.

Yes, 30,000litres because it will be servicing about 3 village communities in Benue State, good/clean water is still a very big problem there.

The plan is to sink 1 borehole and the intention is to use a Grundfos submersible pump that can last a good while before we have to do any major changes.

The proposed plan for now is that they have some days of the week (4 days) where people can fetch and we use the other days to pump/clean the area so ideally, we would need the tank full or almost full for "fetch days".

As for budget, its a project that needs to be done because the need is just so great. What matters the most is getting it done and done very well and possibly a system that requires very low involvement after. This is why the power system is the next biggest source of concern especially with the epileptic PHCN power supply.

Thanks again!


earthrealm:


30,000liters,
Wow thats a massive project.
There are so many variables involved, not so easy to give you a direct answer...

1. Whats the budget?
2. Is the plan to sink only 1 borehole to feed the tank or several?.

3. What is the expected daily water demand.
4. Do you want the tank to be filled at all times?.

To save cost, and simplyfy things i would advise for a battery less inverter, and go for grundfos submersible pump, say 4hp to 8hp.you need a pump capable of supplying 7k liters per hour, if you ever hope to fill up the tank daily.

Grundfos pumps are pricey asf, but they are install and forget grin.

If you are on a budget, then i would advice you sink 2 boreholes and put cheaper chinese sumbersible pumps of similar rating, however you may need to be changing them after a couple of years...
Re: Solar Energy, A Complement To FTA by lat55(f): 10:30am On Dec 07, 2020
Thanks for your response.

We are considering using a 7.5HP Grundfos submersible pump. While doing some research I did come across the polar powered pumps. I am not well versed in this so I am trying to gather as much information as possible to give us a clearer picture before we begin the project.

Regards

NiyiOmoIyunade:
From a power supply point of view, what really matters is the size of the pump(s) to be used with the tank and how many hours of run time for the inlet and outlet pumps.

People have had success with solar powered DC pumps but I encourage an holistic view of the system design and then let your power needs be developed off that.


Re: Solar Energy, A Complement To FTA by Teewhy2: 3:08pm On Dec 07, 2020
Good Day House,
I have some 150 watts (5 pcs) panels that I am using for my solar system and planning to add more, I will like to confirm if it is possible to add different panel watts say 250/300 watts panels to the present system considering am using Fangpusun 70 amps MPPT charger.
Re: Solar Energy, A Complement To FTA by tobintin(m): 7:04pm On Dec 07, 2020
Hi Gurus,

Please I need advise on which panel stringing and combination for maximum harvest for a Victron MPPT 100/50 with maximum CC wattage of 1400watts. My system voltage is 24V. Using the Victron MPPT calculator with 4 (2S2P) 320W panels totaling 1280W shows 50A power limiting at low temperature. Is this stringing okay? and how do I oversize to accommodate for periods of low sunshine.
Panel information is: Vmpp - 33.5, Impp - 9.58, Voc - 39.9, Isc - 10.08.
Re: Solar Energy, A Complement To FTA by dollarnaira: 11:31pm On Dec 07, 2020
Total load 400w
With the above load plus 2x 200amp batteries,24v inverter.
1. How many solar panels do I need?
2. What size of cc(mppt) do I need?
Plssssssss

1 Like

Re: Solar Energy, A Complement To FTA by omotoda(m): 5:18am On Dec 08, 2020
Any one in the house with fairly used but good batteries for sale please quote me.Especially our LiFePo4 upgrade dons.I am urgently in need if 3 units grin
Re: Solar Energy, A Complement To FTA by NiyiOmoIyunade(m): 5:30am On Dec 08, 2020
Maintain the arrangement as 2 panels in series for a VoC of 80v ish.

Add a 3rd string in parallel (2 more 320w modules) to oversize.

So you end up with 6 320w panels arranged as 2S3P


tobintin:
Hi Gurus,

Please I need advise on which panel stringing and combination for maximum harvest for a Victron MPPT 100/50 with maximum CC wattage of 1400watts. My system voltage is 24V. Using the Victron MPPT calculator with 4 (2S2P) 320W panels totaling 1280W shows 50A power limiting at low temperature. Is this stringing okay? and how do I oversize to accommodate for periods of low sunshine.
Panel information is: Vmpp - 33.5, Impp - 9.58, Voc - 39.9, Isc - 10.08.

1 Like

Re: Solar Energy, A Complement To FTA by mctfopt: 5:51am On Dec 08, 2020
Teewhy2:
Good Day House,
I have some 150 watts (5 pcs) panels that I am using for my solar system and planning to add more, I will like to confirm if it is possible to add different panel watts say 250/300 watts panels to the present system considering am using Fangpusun 70 amps MPPT charger.

If you can closely match the open circuit voltage (VOC) of the 250/300w panel then you are good. Though you may lose some power due to mismatch, but your overall yield will be much better than running only the five 150watts.

So in practice, most VoC range of 150w is from 18v to 20v and that of 250w is from 36v to 40v. So if you connect two 150w in series and parallel it with the other two, you will have one left unconnected. You may need one more 150w to balance up the VoC then you can parallel with a 250w or 300w. The power loss then will be minimal. Still better than running only the five 150 watts cool

Or to avoid the headache, just buy more 150w or sell off the 150w and go full 300w or 250w.

2 Likes

Re: Solar Energy, A Complement To FTA by Namzy(m): 6:42am On Dec 08, 2020
dollarnaira:
Total load 400w
With the above load plus 2x 200amp batteries,24v inverter.
1. How many solar panels do I need?
2. What size of cc(mppt) do I need?
Plssssssss

400w for how long?
Re: Solar Energy, A Complement To FTA by dollarnaira: 8:45am On Dec 08, 2020
Namzy:

400w for how long?
8hrs
Re: Solar Energy, A Complement To FTA by Teewhy2: 8:58am On Dec 08, 2020
mctfopt:


If you can closely match the open circuit voltage (VOC) of the 250/300w panel then you are good. Though you may lose some power due to mismatch, but your overall yield will be much better than running only the five 150watts.

So in practice, most VoC range of 150w is from 18v to 20v and that of 250w is from 36v to 40v. So if you connect two 150w in series and parallel it with the other two, you will have one left unconnected. You may need one more 150w to balance up the VoC then you can parallel with a 250w or 300w. The power loss then will be minimal. Still better than running only the five 150 watts cool

Or to avoid the headache, just buy more 150w or sell off the 150w and go full 300w or 250w.

thank you sir, I appreciate.
Re: Solar Energy, A Complement To FTA by Namzy(m): 9:03am On Dec 08, 2020
dollarnaira:

8hrs
You'd be needing about between 900w to 1200w of solar panels
Re: Solar Energy, A Complement To FTA by durodee(m): 11:17am On Dec 08, 2020
Good day house.
By January, I will be moving to a facility for work related activities that I have calculated power use of about 2000w hourly with minimal day Vs night variations in usage, making a total of about 48kw/day.
At present, I have 24 pieces of 300w Canadian Mono panels, 1. 4kw Amorphous panels, 2 EPSolar 60amp CC, with one 60amp Pfanpusun and one 60amp PowerMr CC as backup, one 6kw 24v VIL Power star inverter and 10kw stab to control grid imput and three backup generators (10kva Petrol, 10kva diesel and 15kva diesel)
I plan to use a 48v system and so I will have to sideline the VIL inverter and go for a 5kw 48v Hybrid Axpert VMIIl model with DC solar imput of 500v. Another option is the Kings series with parallelling capability incase I want to put air cons on the system.
On the sideline I will be running a 12v DC lightning system to carry bulbs with 200-250w total capacity for 12 hours daily. I have 4 pieces of 3 year old Monbat 200amps Batts to be dealing with that.
My main challenge right now is storage for the main system. While I had been eyeing LiFePO4 battery system, it had become quite clear that it will have to be pushed to 2021/22 axis. New lead acids SMF will cost about 1.5mill which unfortunately is not at all feasible now.
I am now considering fairly used 12 pieces 200amp SMF Batts to tide me over for about a year. Or is there an alternative within the scope of 500k?
Thank you for your comments and imput.
Re: Solar Energy, A Complement To FTA by NiyiOmoIyunade(m): 12:06pm On Dec 08, 2020
The only thing I will say is that if you plan to run 2kw loads off fairly used batteries which will very likely not be matched in capacity, then strongly consider using a 12v nominal system with suitable 12v inverter or implementing an effective battery balance scheme if you plan 48v. I can assure you that the common battery balancers will not help much to keep everything in sync when you run large loads off used batteries.



durodee:
.....My main challenge right now is storage for the main system. While I had been eyeing LiFePO4 battery system, it had become quite clear that it will have to be pushed to 2021/22 axis. New lead acids SMF will cost about 1.5mill which unfortunately is not at all feasible now.
I am now considering fairly used 12 pieces 200amp SMF Batts to tide me over for about a year. Or is there an alternative within the scope of 500k?
Thank you for your comments and imput.

4 Likes

Re: Solar Energy, A Complement To FTA by durodee(m): 12:33pm On Dec 08, 2020
I plan to use 3 strings and parallel each battery in positions A, B, C and D of the string. I will charge each battery independently before installation and try as much as possible to match each string and position during setup.
As long as the system lasts about a year I am OK. I suspect that for it to last the nights the DoD will be very steep maybe down to 45v or so. 10pm to 6am is the most critical period for me as I will prefer not to have to run a Gen during that period.


NiyiOmoIyunade:
The only thing I will say is that if you plan to run 2kw loads off fairly used batteries which will very likely not be matched in capacity, then strongly consider using a 12v nominal system with suitable 12v inverter or implementing an effective battery balance scheme if you plan 48v. I can assure you that the common battery balancers will not help much to keep everything in sync when you run large loads off used batteries.



Re: Solar Energy, A Complement To FTA by ayo1984: 2:21pm On Dec 08, 2020
Since yesterday when thunder strike, My Mpower inverter (1.5kva) is always switching itself off with a continuous alarm and blinking of d 'mains' indicator
Re: Solar Energy, A Complement To FTA by omotoda(m): 3:24pm On Dec 08, 2020
NiyiOmoIyunade:
The only thing I will say is that if you plan to run 2kw loads off fairly used batteries which will very likely not be matched in capacity, then strongly consider using a 12v nominal system with suitable 12v inverter or implementing an effective battery balance scheme if you plan 48v. I can assure you that the common battery balancers will not help much to keep everything in sync when you run large loads off used batteries.







Is anything wrong in using 100ah batteries for 2.5kva/36volts inverter?Just asking for knowledge sake !!

Input needed urgently!!!
Re: Solar Energy, A Complement To FTA by odimbannamdi(m): 4:07pm On Dec 08, 2020
omotoda:
Please expert in the house,is there really any difference in the efficiency of PWM CC compared to MPPT?I have attached 2 pictures of the current generated by both at about 10:30 am today.There isn't really any significant difference.The MPPT is connected to 260w x4 units of Felicity panels and is charging 2units of 200ah batteries in series while the PWM is connected to 160w x 4 units of Felicity panels charging 3 units of 105ah batteries in parallel.I really do not see much difference except there is something I am not analysing right.

Boss, how do i reach you? I need assistance connecting my own PowMr CC.

I sent you a PM though
Re: Solar Energy, A Complement To FTA by omotoda(m): 4:21pm On Dec 08, 2020
odimbannamdi:


Boss, how do i reach you? I need assistance connecting my own PowMr CC.

I sent you a PM though

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