teamman:
Premium Rolls S6-L16-HC 6v 445AH batteries available for sale. The batteries were imported from Canada for a project, however the power requirements for the project was oversized. We have over 50 batteries left. All were manufactured in 2017. Price is 100k per battery. Please WhatsApp or Call 08086009949 for more enquires.

bigrovar:
Everything that has been said about proponent of Lithium all goes to reaffirm my believe about the tech and why I still maintain that for DIY and mainstream solar user Lithium is not there yet. It is still too expensive, complicated and potentially dangerous. Yes advance in portable and mobile tech would not have been possible without lithium which is exactly where lithium shines best. Close loop applications where it is designed as a one piece solution with charging battery monitoring all built in and the whole system is offered as a one piece machine. This is what you get with a laptop and electric car and mobile phone. The lithium battery is part of a whole. It is what tesla offers and it is why tesla power pack sells. The thing about such systems is that they are very very expensive more expensive than even buying battery packs in isolation and then assembling it into a power backup solution.. In fact in middle income countries like Australia such systems are so expensive that they are ownship cost is spread over 4 to 10 years where the owner pay small small.

Now this does not mean u can not diy lithium it just means the level of skill and time required is very high and margin of error very very thing.. One bad move and if u are lucky your bank will fail otherwise you are playing with fire.

Someone talked about finding the right BMS digging through the Chinese Market or getting an American brand then the right charger and right balancer this things are not easy and sometimes by the time u realise you have the wrong component it is already too late.. For lithium given the cost often time such mistakes can be very expensive. Same thing can not be said for lead which can be quite forgiven. You can assemble an offgrid bank easily and cheaply buying off the shelf components. Worse that can happen is your battery don't get improper charge and even this can be remedied if you notice quickly.

Lastly the notion that lithium will get cheaper as production ramps up is not backed by reality. Lithium is made from rare earth materials which are not easily available. This is why it is expensive in the first place. There are few places in the world with large deposit of lithium and as it becomes indemand the price would go down as producing becomes efficient up to a point then it will go up as demand begin to out stripe supply and we would be back to cartel system we see with oil where lithium countries try to control price to make more money.

Lithium has its applications no doubt especially with mobile tech ie laptop, phones, auto.. It is still a long way from being defacto standard for home use. And when I say long I am looking at 5 to 8 years. And the future of lithium lies in all in one closed loop systems not the voltron system we see with lead acid.

The only person who currently uses a lithium system for his offgrid on here got some of the best lithium battery cell and from a classified project.. That alone should tell you something.

HeartforGod:
Hi gurus in the house,

Please, someone help do analysis for me on the much talked about lithium phosphate ion battery against lead acid battery (AGM).


I have plans for a 600AH lead acid battery at 24V (cost = 640k).
So, using these factors (especially cost) to get equivalent for lithium phosphate battery, analyse to help me make an informed decision.

Thanks in advance

earnvest:
12V, 80AH Lithium Batteries (7.2kg, 6000 Cycles) for $199

https://batteryhookup.com/products/6000-cycles-lithium-ion-polymer-12v-battery-electrovaya-10-95v-80ah-ev3s2p-1kwh?rfsn=1780762.2b5a7&variant=28616229683279

Any takers?

wirinet:


I am also looking at building Lipo4 battery packs for inverters as they far out perform lead acid. Replacing lead acid batteries every 1 to 2 years is making inverter and solar set up as expensive as running generator, thereby discouraging many people from going solar or acquiring inverter systems.

Your analysis is very good and details but with slight corrections.
The capacity of a lead acid battery is heavily dependent on the rate of discharge. The 200ah specified by the quanta battery is at a rate of discharge of C/20. Most inverter and solar set ups discharges at far less than C/20, most times its between C/5 and C/10. Most people neglect this little detail in calculating battery capacity for lead acid. This is why most people complain they get less capacity than written on the battery pack.

Even though Lipo4 also suffer some loss of capacity with rate of discharge it is very small compared to lead acid.

Another fact with liPo4 is that charging voltage and discharge voltage has a huge impact on cycle life. Nominal voltage for LiPo4 is 3.2v, while maximum voltage is 3.6v. Charging to a maximum of 3.5v can double cycle life. Same thing too for minimum discharge, minimum voltage is 2.5v, discharging to 2.6v can also greatly increase cycle life.

One problem with lead acid which I learnt through experience is power wastage. Lead acid wastes a lot of voltage while charging. This is noticeable with a solar set up. When I measure open voltage with a 100w, 5a solar panel I read 4.2a in direct sunlight, but when I measure current going into my lead acid battery, it is usually around 3.0a. I am losing a whole 1.2a just charging the lead acid battery. When I measure current when charging lithium phosphate, I get more than 4.0a. It seems the internal resistance of lead acid is far higher than that of Lipo4.

The draw back with lithium batteries is that they are unforgiving if you don't handle them well. They are prone to explosions and fire if you overcharge, undercharge or if out of balance. That why proper charger and balancer is crucial.

tsiriman:


Thank you for the suggestion but 800VA will be to small even though I don't plan to run AC or heater with it. I have 2 TVs and several fans.

tsiriman:
Please house which is the best or let me say a good 3.5kva 48V inverter one can buy?

I also plan to pair the inverter with quanta batteries, is this a good combo?

earthrealm:


mppt needs +5v headroom to work, ur system being 24v, if perhaps the batt is at 25v...ur panel outs btw 27v to 35v, so you can see that at anything below say 31v, it cant charge your batts,

you can also see that your other installation is doing better, cos you wired 2 panels in series, thus higher voltage headroom.

for the troublesome setup, either downgrade to a 12v setup or u connect have 2 panels in series.
am assuming your cable sizes and distance is within spec

desiji:
Did you buy the complete APM with the soonoffs or only the Software and did the TH16 was brought from somewhere else and the you did the firmware upgrade yourself?

hisenjos:
Brought in some of these batteries
Valence 12RT Lithium

VALENCE U-Charge Lithium Iron Magnesium Phosphate Battery 12v 40Ah U1-12RT

They have built in BMS in each unit
40ah capacity. Very lightweight
Pulls from medical installs
Currently testing at a client 8 units at 24v
Then in my office, 8 units at 48v
Another 12 units in another site 48v
May offer some for sale if in excess of our needs

Godliftedme:
House,

Good evening.
I have been thinking over 3-phase solar power system to power a mixed load of 10KW (5.5KW 3phase load and 4.5KW single phase load) between 7:30am - 6:30pm, from my findings most 3-phase setup requires a priming voltage for the unit to work, meaning I need to have another power source to get the 3-phase system working which looks like most 3-phase inverters are designed while considering develop nations with constant power supply.

Also, most solutions requires combining 3 inverter units to achieve the 3-phase power which makes the cost of procurement / installation to be on the high side to achieve. Just wondering if there could be solutions without the need of battery to considerably bring down the cost drastically.


Check Ipower or gennex which have 3 phase 10 KVA inevreters most probabaly still or import from MPPsolar

https://www.mppsolar.com/v3/mpi-hybrid-series-2/
Alternatively costsly alternative is fronius symo hybrid ( 5 KVA) - http://www.europe-solarshop.com/inverters/fronius/fronius-symo-hybrid/fronius-symo-hybrid-5-0-3-s.html

or sunny boy stoarge upto 6 KW - https://www.europe-solarstore.com/sma-sunny-boy-storage-5-0.html ( singel phase but each inverter can manage three seprate battries !!)


Is there any 3-phase Inverter system solution that does not require 3 individual Inverter units to achieve and does not need another power source to work or without the need for battery since the loading will be basically during the day.

Appreciate knowledge from the experienced elders of the forum with economical solutions that meets this mixed loads and is reliable.

chris81964:

Where outside of the deep North do you get 6 hours of sunshine?

earthrealm:


Great.saw easy fixes..now the big question of getting the items in nigeria, wish to avoid the 3 to 4wks delay in importing from usa.

Have you done such repairs b4......did u get the materials locally

Desanta:

This is the display at night.

NairaBaba:


It can easily be achieved if the voltage is used as the signal instead of power. I currently have a system that uses the battery voltage as the signal to active a low/high disconnect monitoring Relay which in turn activate or de-activate contactors. These contactors control selected loads such fridge, ACs, sockets etc

mank1234:
How can I achieve the scenerio below :
Make a device to come on only when instantaneous energy from a solar array reaches 1500W and then goes off when it falls below 500W?

Wazari:
NoMoretrolling,

Using your own analysis, 800k will get you almost 5 pairs of the quanta batteries over a ten year period if you grow the capital by at least 10% annually assuming zero inflation (it is not the most difficult thing to grow by 10% above nominal inflation).

Also the life cycle chart you posted shows 600 - 700 cycles at 50% DOD for the quanta. So 5 sets of the quanta to the 1 set of BB is more accurate statement.

Therefore a lithium battery would need to last over 10 years (80% original capacity) before it shows a cost advantage over lead acid and this period is not usually covered by warranty.

In Nigeria, unless you are willing to go the DIY route (which increases the probability of failure), the cost-benefit of lithium over lead acid is not as clear cut as you make it appear.

ojeysky:


Will patronise them if indeed it's how dey charge. I have reached out to them waiting for their response.
Thanks

earthrealm:


You could try shop to my door.
They charge $1 per lbs for ocean freight.clearing inclusive dont think a 100amp lipo4 battery would be more than 70lbs
You could contact them for more details

makavele:



This is what happened.

Whilst in use like every other night, the inverter tripped and it was lights-out in the whole house.

Went back to the inverter, everything was fine. Flicked the red switch off and on again, the inverter booted up and next thing I heard was " a loud pop and a spark"

Then lights-out again. That was it. So I wonder where and how "any short circuit" happened; unless some village people

have been doing things downstairs while I was up.

GeorgeD1:


samnaija,

not exactly, bro
i'm still using the protek brand till date but that doesn't mean i wouldn't speak out to warn
other prospective buyers of their shylock tendencies.

as for being in hibernation, that also is not exactly correct. if you check my profile, i've always
been around but what's the point posting repeated answers to questions already made good
by able members like niyi, chris, bigrovar, saipro, zeestone, pranil, et al?

duwdu:


When it is considered that the initial prices paid for the panels were one-time capital costs, the 'Canadians' on account of better yields soon break even when compared to the Flames; the Canadians soon overwhelm the Flames "indefinitely" w.r.t. yields it won't even be funny.

........
P34c3
.....
....

mktinsight:
Thanks for the info guys.

I have more questions. Lets say you have six rental units. These units have the exact same configuration - 2 fans, 1 tv, LED lights. Occupancy of these units ranges from 25% (quarter full) to 100% during the course of the year. Lets say you want to use an inverter to power these units as a standby with a minimum of 12 hours per day:

1) Would you install 6 Separate inverters and batteries in each unit or 1 big inverter with a battery bank?
2) What battery configuration would you need to supply at least 12 hours of standby power per day?
3) Please explain which setup is more efficient, cheaper, easier to maintain

Thanks

Dam5reey:


I believe this is the best approach.. the charging is capped but Extra power can be used by the load, so if you get 40 amp from panel 15 will be used for charging the remaining will supply load if load is available, else the remaining 25 will waste

Do you mean the extra power will not be used when eco mode is not enabled?

Namzy:

1. There's really no way best way to determine best solar panels as some tier 2 might even be better than tier 1 companies best bet is to look for specifications of each solar panel and it helps to buy tier 1 as you are usually likely to get a better product. I recommend jinko solar. Buy direct from supplier for cheaper rates. Eg 340w mono goes for 60k
2. Luminous hybrid comes with pwm controller you'd be better of with the increased power from an mppt controller considering your battery size which would need equalizing at least 2 times a year. Get fangpusun blue solar 50a from AliExpress for 37k for led version which solves the problem as it is mppt and has equalizing function. If going for the fangpusun update yourself about it pros and cons which majorly is you must not update but at its 1.16 firmware its still very much a good product

mktinsight:
I recently installed a 1.5Kva Luminous Solar Hybrid Inverter with 2 220ah Luminous Flooded Inverlast batteries. The load on the inverter is roughly 10 5Watt LED bulbs, 2 70w fans and a 32 inch LED TV with GoTV decoder.

I want to add some solar panels and I have several questions:

1) What Solar panels do you recommend with PROVEN high production efficiencies? I read of Flames, Suntech, Canadian Solar, Yingli, etc. etc.

2) The Luminous Solar Hybrid has an in-built CC of 40a. Does anyone have experience with this inverter? Should I still buy a separate MPPT for the solar setup or use the inbuilt?

3) I read about the importance of equalizing batteries. How often should I do this for my batteries, what charger should I use and for how long?

Thanks.

kiekie1:


Hello Good morning, been a while although you do send personal messages via WhatsApp if you need to commune with me .. Simply overlook unnecessary biased assumptions as I see nothing spectacular or criminal minded castigations as you made it look , so try ignore as most men do ! An adjusted/edited post per page might be for a target audience and I don't see how some monitor such when not interested ! "He who wears the shoes knows where it itches" , those who post ain't equal to most who call n transact if seriously interested , simply ignore if not interested ! Don't be too quick to always judge one tho as we don't have same individual characteristics ... Thanks

ojeysky:


I am looking at the manual it's written 320vdc as the normal operating voltage but the attached picture reads 240vdc.

Irrespective am trying to understand what this means, does it mean that it is until I have sufficient number of panels in series totalling 240v that the stuff can work?

So if a solar panel Max PV is 32v I will need a least 8 panels before I can use this inverter?

NiyiOmoIyunade:
Looks good!



How is the Knife Switch handling arcing with DC currents passing through when you (dis)connect the PV array?