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Nairaland Forum / Entertainment / TV/Movies / Satellite TV Technology / Solar Energy, A Complement To FTA (2277646 Views)
UPS Back-up, Also A Complement To FTA / FTA Frequency / Cctv Installation A Complement To Fta And Solar Energy (2) (3) (4)
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Re: Solar Energy, A Complement To FTA by NiyiOmoIyunade(m): 12:13pm On Nov 23, 2017 |
No doubt series connections are the superior way to move power around with minimal losses. The point I am trying to make is that you will need to use extra effort to keep the individual batteries in a series connection closely matched together as time goes by and if you run your batteries up to or below 50% DoD routinely. The problem with equalization in series is that to be successful, it assumes the batteries are still closely matched in capacity/performance - imagine a 50% discharged battery placed in series with an 80% discharged one in a 24v system - at full charge one battery is at 100% while the other is at 70% - equalization at high voltage for 4 hours would just boil the battery already at 100% and may not fully charge the one at 70%. Hence I advocate isolating each battery and charging to full charge individually. Shallow battery cyclers may never really push their battery to the limits hence they assume all is well - you would be surprised if you ran a capacity test on your batteries to find that they are all not of thesame capacity anymore bigrovar: |
Re: Solar Energy, A Complement To FTA by makavele: 12:31pm On Nov 23, 2017 |
mank1234: I dont work with theories sir . . . especially those that don't apply to real life . .e.g 12v 100ah battery at 50% d.o.d on 30w load cumulative = 20 hrs backup that is theory . . not correct in practical. . even if we adjust for losses in the system multiply by .80 inverter efficiency; still theory even if you add battery peukert effect, still theory . . the only way to know how long it would last, do a live demonstration and use a stopwatch ! so like i said; and still stand by, get two ammeters and do the measurement . . . I am more concerned with the current hitting the terminals ! Until then; peace !!! |
Re: Solar Energy, A Complement To FTA by efuro(m): 12:33pm On Nov 23, 2017 |
DUNKA: JUO: Publish all his phone no. Here pls. It is a very bad trend here. We have very honourable members here. We may invoke referrals through known forum members soon. Letz make Nija beta. 1 Like |
Re: Solar Energy, A Complement To FTA by kiekie1(m): 1:43pm On Nov 23, 2017 |
makavele: I was dismayed its same "infinitikoncept" i sent a fairly new mercury 3kva power inverter & batteries to few weeks ago.. The post has almost clocked 30 pages overnight |
Re: Solar Energy, A Complement To FTA by kiekie1(m): 2:10pm On Nov 23, 2017 |
JUO: This is quite painful tho .. I just remembered your discussion with me few days ago but kindly mail me if you still interested in your request ! My instincts was right that fateful day but sorry for the loss ... Everything has its pros & cons as I duely select clients I do "pay on delivery" or "installmental payments" with . Hope you can now see the reasons why Mr XYZ did what he did that day via inspection of 80a mppt then ... It is well ! 1 Like |
Re: Solar Energy, A Complement To FTA by Barezzi(m): 2:19pm On Nov 23, 2017 |
makavele:Where i dey since!? Bigrovar rested this matter earlier. Same scenario plays out with my bmv702 battery monitor and midnite classic cc. |
Re: Solar Energy, A Complement To FTA by kiekie1(m): 2:34pm On Nov 23, 2017 |
bigrovar: Hmmn, can we really do without parallel looping- connections ? Take for instance , George D 3 step 48v battery string connection which has been serving him well .. I also use same technique and my battery voltage are stable with very little differentials ...I might be wrong , but does your analysis also support 12 unit of 48v battery bank connected in series & parralel with equal sized cables ? Are battery cost the only reason why so many discard 96v inverters nowadays ?? I have seen so many battery balancer blow up or malfunction at various site for reasons I can't really phantom tho ! I understood Mr Niyi point as I have been using the same step on charging individual battery to MAX before hooking it up in strings & switching batteries by rearranging them for balancing sake too...Most installers might be lazy to do all this due to time & money factor but it works.. Untimely death of batteries really hurts for those who havnt been in such situation before ! Below is a snapshot on inspection & maintenance recently carried out on L16 flooded batteries corroded cabling, lubrication , PV array cleansing & electrolyte balancing as happy clients effects more customer referrals : 1 Like
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Re: Solar Energy, A Complement To FTA by kiekie1(m): 2:38pm On Nov 23, 2017 |
Barezzi: Lol Oga , you dey chill for that normal spot nw ! |
Re: Solar Energy, A Complement To FTA by JUO(m): 2:56pm On Nov 23, 2017 |
bigrovar:Very correct |
Re: Solar Energy, A Complement To FTA by Dam5reey(m): 3:55pm On Nov 23, 2017 |
BMV is a device on its own that uses shunts and also sort of battery management as well as it's calculations... I'm sure makavele is not using shunts.. he connect his cc and battery directly... so his practicals is correct as well... |
Re: Solar Energy, A Complement To FTA by pranil(m): 4:42pm On Nov 23, 2017 |
HeartforGod: In my case the zinnox are wired in parallel with common neutral and phase - but they require a seprate parallel board plus communication cable between two inverters and current sharing cable If the manufacturer has not clearly indicated if the inverters can paralleledled then NEVER parallel them even only neutral [font=Lucida Sans Unicode][/font] In case of grid failure the neutrals will be floating and can cause circulating currents between inverters and all kinds of strange behaviours |
Re: Solar Energy, A Complement To FTA by pranil(m): 4:46pm On Nov 23, 2017 |
NiyiOmoIyunade: It is very dangerous to do that if the CC really fails it can cause the whole battery to discharge through it at short circuit currents and will cause cables to catch fire. You can always put cables rated at 1.5 the o/p current of CC and fuses so it will never trip unless really fault occurs ( the fuses trip only after 2 to 3 times of rated current and the characterstics is inverse) |
Re: Solar Energy, A Complement To FTA by pranil(m): 5:03pm On Nov 23, 2017 |
NiyiOmoIyunade: 72 Cell panels Typically 250 watt and above are higher Vmpp appox 34 to 37 V so it is enough to use two panels in series for 48 V battery . For sixty cell panels, it is better to use three panels for headroom Infact a 72 V cell panel 3 in series you have nominal loss of 1-5 % of rated power due to conversion from higher volatge to lower volatge 1 Like |
Re: Solar Energy, A Complement To FTA by pranil(m): 5:25pm On Nov 23, 2017 |
makavele: |
Re: Solar Energy, A Complement To FTA by pranil(m): 5:36pm On Nov 23, 2017 |
makavele: all depends on how the circuit is wired is the inverter and charge controller paralleled before connecting to battery or both are connected to battery see video of my installation https://www.youtube.com/watch?v=aZ7uu3_dLAc where you can clearly see the battery on the float with minimal current but PV charger( victron CC) still producing and supplying load The DC system in the video is ipower charge controller/inverter also contributing 250 watts for the load along with Victron charge controller As you can see both CC are connected to 2.5 KW each but they are contributing just enough power to supply load while keeping batteries floating with out cooking the battries |
Re: Solar Energy, A Complement To FTA by pranil(m): 5:42pm On Nov 23, 2017 |
NiyiOmoIyunade: Or just use Victron Battery balancer - https://www.victronenergy.com/batteries/battery-balancer |
Re: Solar Energy, A Complement To FTA by NiyiOmoIyunade(m): 6:40pm On Nov 23, 2017 |
I have considered it! But I have 8 pieces of 6v US Battery L16s connected in series to make a 48v system - it would be a wiring nightmare to set this up with balancers (at least I don't see a simple way to do it) Also multiple balancers is multiple points of failure - without any load my PV array generates a steady peak of 85amps - imagine what would happen if any of the balancers failed during charge with 85amps coming from the panels when the CC has lost battery power and cannot open the FETs or otherwise invoke its protections. I once used the Sukam balancer long ago on my small 24v system with zero positive effect so it kinda made me believe this things are 'snake oil' I need a low cost solution that I can reuse with clients - the balancers are a tad pricey and complicated to setup - periodic battery balancing with cheap 12v smart chargers is a useful service that we can bill for together with blowing dust off the inverter internals and putting dielectric grease on while retorquing battery and electrical connections for the client pranil: |
Re: Solar Energy, A Complement To FTA by makavele: 6:44pm On Nov 23, 2017 |
Dam5reey: smart you / / / |
Re: Solar Energy, A Complement To FTA by NiyiOmoIyunade(m): 7:15pm On Nov 23, 2017 |
70v PV input (just two 35vmp panels in series) to drive a 48v nominal system that will charge between 56 and 62volts is cutting it rather too close for MPPT. Doubtless the system would charge but I am pretty sure it would not be deriving any MPPT benefits. Very likely it would be working much like a suboptimal PWM system. pranil: |
Re: Solar Energy, A Complement To FTA by makavele: 7:23pm On Nov 23, 2017 |
NiyiOmoIyunade: . . . and the one who felt the tusk decided the elephant was much like a spear; while the one who felt the ears said the elephant was more like a fan 1 Like |
Re: Solar Energy, A Complement To FTA by NiyiOmoIyunade(m): 7:23pm On Nov 23, 2017 |
Valid point about floating neutrals. If we break only the live wire there is a very good chance that the neutral could become energized when the breaker trips. Noted for my future designs. pranil: |
Re: Solar Energy, A Complement To FTA by NiyiOmoIyunade(m): 7:27pm On Nov 23, 2017 |
Lolz! Based on what you have explained in your earlier posts at least I know you have a clear picture of what the whole elephant looks like makavele: |
Re: Solar Energy, A Complement To FTA by NiyiOmoIyunade(m): 7:35pm On Nov 23, 2017 |
House I need help. I have a diagnostics lab I support where the incoming voltage from the mains is routinely between 240v and 250v (the shopping complex has a dedicated and lightly loaded transformer). Now we all know lab equipment generally have low overvoltage tolerance so the equipment gets hot or hums at 240v. How can I reliably step down 240v to say 210 - 220v max? Most stabilizers I know will simply pass through 240v without stepping it down at all. Right now the lab is getting by by isolating the mains (putting changeover in neutral) when they want to run the equipment and running off either inverter at 230v output or Gen at 217 - 222v output Solutions and ideas please - if you know any stabilisers or other equipment that can cap output voltage at 220v I would appreciate it. |
Re: Solar Energy, A Complement To FTA by makavele: 7:35pm On Nov 23, 2017 |
NiyiOmoIyunade: . . . it looks like an elephant, or doesn't it ? lol |
Re: Solar Energy, A Complement To FTA by makavele: 7:37pm On Nov 23, 2017 |
NiyiOmoIyunade: it is always a safer option to have dedicated lines in electricity ... the only draw-back is cost of wiring . . zeestone99 take note !! you & your unrelenting love for common wiring |
Re: Solar Energy, A Complement To FTA by kiekie1(m): 7:43pm On Nov 23, 2017 |
makavele: Pls hope am not the only one interested in the said video clip? |
Re: Solar Energy, A Complement To FTA by Barezzi(m): 7:51pm On Nov 23, 2017 |
pranil:Can you throw more light on how you implemented this? How did you extract the dc value from the ipower, seeing that it's load output is 'ac'? |
Re: Solar Energy, A Complement To FTA by makavele: 7:59pm On Nov 23, 2017 |
kiekie1: It's PPV by the way ! |
Re: Solar Energy, A Complement To FTA by mank1234(m): 8:01pm On Nov 23, 2017 |
Thanks my man. This is exactly what I laboured to explain to makavele all through last night. He refused to accept that load can be used to divert current that otherwise would have ended up charging the battery above its optimum charging current. bigrovar: |
Re: Solar Energy, A Complement To FTA by NiyiOmoIyunade(m): 8:02pm On Nov 23, 2017 |
Zeestone and I have this argument with every installation we do together. He argues that all neutral is common even within the inverter internal circuitry and this is true. Again, I note that the NEC retained the common neutral standard for backward compatibility though they do not encourage it - they recommend that the neutral bus/ wire be at least equal to or twice the size of the live wires. When I look at the average household electrical distribution panel, one sees that all the neutral wires terminate on one bus bar and same for the earth/ground wires - so I have been forced to grudgingly accept his old-school method. makavele: |
Re: Solar Energy, A Complement To FTA by mank1234(m): 8:07pm On Nov 23, 2017 |
This is derailing from the issue in contention, which I believe bigrovar has setttled. Even on this one. The theories as stated by the manufacturers would likely hold barring marketing gimmicks, as long as you hold the variables (temperature, pressure, load etc) precisely as stated by the the manufacturers. Manufacturer cannot state a test result at 25oC for instance and you do yours at 30oC and expect to get same result. makavele: |
Re: Solar Energy, A Complement To FTA by makavele: 8:11pm On Nov 23, 2017 |
mank1234: Even with the same wiring, same temp . . . we would get different results .. you know why already thats why i said its theoritical .. only meant as guidelines . best believe, pranil put it to rest |
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