₦airaland Forum

Emily22:
Zenith is 100$

Ok. GTB same or $200?

busuyi44:
GTBANK MasterCard rate N394/$ as at 27/11/2020

Any idea on current Zenith rate? Both still limited to $200 per month on naira denominated account?

eleojo23:
If I didn't know what a BMS was, I would have thought it was a human being from the way you wrote that.

Remind me of a friend that refers to machines as guys. "This guy won't just come up." Lol

ojeysky:
Naa ignore the min voltage, it occurred when I needed to do some maintenance and disconnected first set of the cells from the BMS(ANT BMS), the BMV was fast to capture the voltage of the remaining cells before I disconnected the rest. Unfortunately there is no way to reset just a data point on BMV without resetting everything so I lived with it. The max voltage is also not what I use normally (I do 27.6v), there was an event to that as well

Most small Indian inverter (luminous, sukam,etc) charge at maximum of 27.5v for the 24v system. Which means one can charge lithium with it without any additional stress except to add a BMS. Ok course you get to miss out on those other bells and whistles of the premium inverters.

ojeysky:
That happened due to cell imbalance, one of the cells got to the low cut off voltage of the BMS (usually 2.5v for LFP some set higher but below 3v) for a balanced cell pack, the voltage indeed does the indicate the battery SOC, it's more accurate with no load.

Higher than 2.5v is cool, reason I prefer programmable BMS. Preset can be set to as low as 2.1v... I think 2.7 to 2.8 should be ok. Or if you love playing it safe do 3v and 3.4v for the upper threshold which you are already doing.

ojtech8291:
Please can you explain more on this? The same thing is happening to one 24V setup now. Sometimes it will work fine but the following day inverter will just shut down with the sunset. Though I discovered that one of the battery down to 10V while the other is 12V. The cable from that connect the battery to the Inverter are not equal. The +Ve is longer that -Ve could that be the cause? if not what could be the cause of this?

The one that goes down to 10v is failing or already failed. Unfortunately, you may have to replace the batteries.

feflo:
Charge Controller

Been a while I've seen this rugged charge controller. Premium really serves.

feflo:
I have been quite busy in the last one month trying to set up our new office and workshop. We now have an office at Alisiba Bus stop, Sango, Ogun state.

Congratulations man! More wins. You really demystify solar and make it easier to obtain. Well done.

ojeysky:
Sure I normally experience this though now my panel is oversized so i don't notice anymore. In other to check if it's a failing battery, you could introduce load and see if the instantaneous yield will increase significantly if it doesn't then you are good with battery

Stop reading my mind. Just typed same before seeing this

shithapuns:
Ojeysky.

Thanks for the explanation, my question is, Are you guys/other people experiencing a similar reduction in harvest.

I also learnt a failing battery bank or a bad battery in the mix could cause poor harvest again.

Yeah, my production has reduced. But you can rule out failing battery by adding more loads to the inverter when it's sunny and watch the charge flowing in. Check whether the current increases (after the sunshine drops and picks up) and sharply tapers off (same may happen when battery is full or near full). But if battery is neither, then you may have a failed or failing battery.

shithapuns:
Is ot just me, or panel degradation setting in.
A 2kw panel array on 60amps cc. 24v inverter struggles to hit 6kw with all the intense sunlight this period.

Same setup easily hit 6.8kw previously.
Is anybody experiencing similar poor harvest?.
Max instantenous i observed was 1.3kw by noon.

What could be the cause?.
Installation about 4 yrs old chinese panels

The days are getting drier, the atmosphere is getting dustier which obstructs the sun's rays. Panel could be partially covered by the dust, of course.

Some of the key results reveal that optimum tilt angle changes between 0° and 42° throughout the year in Nigeria. The optimum value is found to be 0° during the raining seasons (i.e., April-August) in all locations. Findings also show that the optimum tilt angle increases in the range of 5° to 42° during the dry seasons (September-March) reaching its maximum value in the month of December in all the locations. The extractable power on optimum inclined surface increase in the range of 2.5%-9% compared to horizontal surface while the cost of electricity (COE) reduces by 6%-9% when solar panel is placed on optimally inclined surface.

JUO:
yet to confirm the balance current

Ok

JUO:
Anti BMS 200A 7-21s available

Does it have balance current in the range of 1A to 2A? If yes, how much?

ojeysky:
I know someone who has the attached for 50k/60k it's 100A/150A with 1A/1.5A balance

Should've stated the current. At least 200A. Thank you very much for posting this.

I'm in the market for a good smart 8s BMS for Lifepo4 batteries with active balancer of between 1A to 2A. Anyone got ideas on which brand to get? Links, screenshots, suggestions are all welcome.

ceaser:
Thanks so much for this.

@ bolded, I wouldn't be sure but that suspicion was why I made that statement of electric shock when I touched the battery terminal. I'm used to working with standalone systems (that power appliances directly rather than going thru the wiring of the house, so I touch the DC terminals of those without experiencing shock.

What would cause such back feed?

I don't have access to a clamp meter, just the usual multimeter. I'll try a continuity test using that.

In the event of confirmed short which may not be easily traceable, na for the guy to follow Ògá Niyi's prescription of an amp limiter.

But inverters have short circuit protection built into 'em. Isn't that supposed to offer some sort of protection to the device itself so that it does not go kaput due to shorts?



@ bolded. I don't really get that connection described.

Most backfeed is mostly from electrical connection, when the output is allowed to feed the input. Also it can be as a result of inverter failure.


The short circuit protection response time of various inverter differs, some may respond slower than others, and by then the damage is already done.

The connection I described is simply bypassing the inverter. Just connect both lives together, do same for both neutral and the earth respectively- effectively bypassing the inverter.

ceaser:
Hmmm. Okay, when I tried to fix the second inverter, I inadvertently touched the positive pole of the battery terminal while the inverter was working (had my feet on the bare floor) and I sensed an electric shock. Could that suggest a live-neutral short?

How does one get an electronic amp limiter?

In cases of confirmed short, is there a way that can be finally corrected that the continued use of the limiter will not be necessary?

If you can trace the short and remove it that will be fine. A generator can handle shorts better than an inverter. Run a continuity test between the three wires (L,N and E). You can check the wires to see if there are areas (especially around joints) that the live may be making contacts with either the neutral or earth. This can also be ascertained by putting the loads off, removing both the output and input wires of the inverter and connecting it together, place a clamp meter on the wire and power on. Check for any presence of high current. If you cannot find any, then there is no short on the line.

Also there is a possibility that there is a faulty electrical equipment that introduces short to the system. You can have them power everything they ever use (including chargers for different devices) to see if any of it is the rogue equipment.

I hope there is no backfeed from the output of the inverter to the input.

The shock you got may have something to do with you being bare feet. Reason it is advised to wear a thick rubber boot while working with electricity- you gotta increase your resistance to electric current flow.

AetA:
Thank you, I really appreciate your assistance, pleas can you recommend a sea shipping company to me? I tried sending you an email through Nairaland but it didn't go through. please how can I reach you?

I can't really recommend any good shipping company as the ones I've used all have one story to another. Very unpleasant experience, so I'm not going to recommend any of 'em. Wish I can help you more on this.

AetA:
Please what if it is less than 0.5CBM?

You may have to contact the shipper to know more on this. Rates and the way they go about it is different depending on shipper involved.

papalasun:
Funkam logistics
07031357996

How much did you ship these 60pcs of 280AH batteries?

AetA:
Please someone should help me out I want to ship some items from China to Nigeria through sea shipping, if it is calculated by CBM what if my package is not up to one CBM how do I go about it? Your responses will be highly appreciated and I would also need a good sea shipping company.

If it is more than 0.5CBM, some shippers will give it to you at the rate of 1CBM.

SolnergyPower:
525 Pieces.

Neighborhood of 180k and 200k.

Thank you very much sir.

Ok cool. Got the same when I counted from the picture. As long as all the necessary protective devices are added, good one.

SolnergyPower:
LOCALLY MADE!!!

24V 130AH Lithium Pack!

Maximum charge current is 25A
Maximum discharge current is 50A
Maximum voltage is 29.4V
Cycle voltage is 28.5

Call/WhatsApp: +234 814 212 6416

How many 18650s did you use? How much?

Dam5reey:
The Green white Green Plus Red is emotional
Abeg paint to another color, Blue or Black Is better

Lol. I agree

Sorry, try another 9mobile office. Don't feel bad about the corporate beggars you just gave money to. Just that their behaviour will surely make it difficult to help those that are genuinely in need.

ceaser:
There is this USB power bank portable spot welder that I came across online. With shipping costs 27k or thereabout.

Looks good for a hobbyist and DIY enthusiast who wants a portable spot welder to use. I guess this may serve, surprisingly our Nigerian person that bought did not review it well, just posted pictures. I love Amazon reviews (though some may be fake) but at least users go all out to give indepth review of things they bought. "I received it" "Good item" no be review na.


Edit: Just saw a YouTube video of it.


https://www.youtube.com/watch?v=K1HZs4ix_6s

Good for a hobbyist.

BetaTechnicians:
Sincerely I don't know much about getting components locally, I source majority of them online.

Looking at your pictures, I've decided that I'll find time to assemble my battery myself. It would even allow me determine the form/shape I prefer considering what I need it for, but the issue is, no spot welder. What safety precautions do you take soldering those cells directly? considering they're not too comfortable with heating.

Order for your spot welder online. Though if you are very good in soldering and own the right soldering iron and lead, I guess you can solder it.

aieromon:
It has been revised to 200USD.

Good news

odimbannamdi:
Boss, please how do i reach you?

Need your advise on something related to that DC digital meter you recommended for me.

I sent you a PM already though.

Thanks

Ok. Seen

NiyiOmoIyunade:
More like mini war sessions.

Interesting nonetheless

Interesting conversations.

Entrepreneurrr:
I didn’t do transaction yesterday.


But today i did with gtb at 391/usd

Thanks a lot