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Nairaland Forum / Entertainment / TV/Movies / Satellite TV Technology / Solar Energy, A Complement To FTA (2272531 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 ceaser: 8:47pm On Oct 15, 2020 |
ojeysky: Oh yes. I forgot that part that you have utility. It implies your system more or less serves as a power back up. |
Re: Solar Energy, A Complement To FTA by NiyiOmoIyunade(m): 8:59pm On Oct 15, 2020 |
Ultimately scaled down to a total of 20 bricks for 48v 1000Ah/48kwh energy stored. I had new stock arrive and customer upsized from 4 units to 8 units so I sadly had to let 4 of mine go after just 2 hours of service. For now at least ojeysky: |
Re: Solar Energy, A Complement To FTA by kiekie1(m): 9:41pm On Oct 15, 2020 |
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Re: Solar Energy, A Complement To FTA by kiekie1(m): 10:35pm On Oct 15, 2020 |
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Re: Solar Energy, A Complement To FTA by zeestone99(m): 12:08am On Oct 16, 2020 |
NiyiOmoIyunade: Nawa o the whole consumption of my village even plus my Street sef ![]() 1 Like |
Re: Solar Energy, A Complement To FTA by danowena: 6:55am On Oct 16, 2020 |
eleojo23:Does DOD mean depth of discharge? How do you measure that? |
Re: Solar Energy, A Complement To FTA by eleojo23: 7:13am On Oct 16, 2020 |
danowena: There is a chart for that using the voltage value. For a 12volt system, 50% DOD is around 12.1 or 12.0 (Multiply the figure by 2 or 4 if it's a 24v or 48v system respectively.) So once it gets to that voltage, you should stop using the battery until it's recharged. Some programmable inverters automatically cut off load at this voltage if set as such. |
Re: Solar Energy, A Complement To FTA by NiyiOmoIyunade(m): 8:08am On Oct 16, 2020 |
Remember I have a fairly decent coding background, the scripts will not run a second iteration until the first one is done so 6 iterations may run in 55 seconds or 1 minute 10 seconds - the goal is to pound the system but keep my dashboard data always live (10 secs or less refresh rate). The real issue is how the OS handles memory, may not cleanly release memory after program terminates and therefore make the system appear short on resources. For a long time, I thought the limiting factor was processor but my deep dive under the hood revealed memory and memory management to be the real issue (was logging system stats every 5 mins and parsing the outputs) I see you are using a Pi4 with 4 times the RAM I have so that explains the stability you have ![]() Because I use a premium EVO SD card, I have no fear of frequent reboots - in any case the scripts I have *sync* the system before performing a reboot so all files and logs are safely written to disc first. litaninja: 1 Like |
Re: Solar Energy, A Complement To FTA by Saipro(m): 8:29am On Oct 16, 2020 |
NiyiOmoIyunade:Seconded I plan to sell off my trusty 3kW 48V PowerStar/MustPower. It's been gathering dust over the past 2 or so years. It performed outstandingly well while in service but somehow doesn't even come close to the MultiPlus which retired it. The Quattro I currently use is essentially a MultiPlus with additional inputs with corresponding attendant features 2 Likes |
Re: Solar Energy, A Complement To FTA by babniyen(m): 8:39am On Oct 16, 2020 |
Good morning house, I am being offered considering a 100ah 24v Lithium battery as a replacement for my 24v 200ah Lead acid. I want to know if it will standup to the same service levels.. Thanks 1 Like |
Re: Solar Energy, A Complement To FTA by wilmaria14: 9:02am On Oct 16, 2020 |
babniyen:200ah is 200ah acid or not it will not perform to dat standard 1 Like |
Re: Solar Energy, A Complement To FTA by Abdomox: 10:47am On Oct 16, 2020 |
eleojo23: Good clarification. The issue is that when battery is on load it drops in volt. Hence measuring the threshold of 12.1v or 12.0v is not that easy. For example, I set my low DC cut-off voltage to 23.6V on my 24v system cos I know when loads are off it, it reverts to 24v or thereabout. What do you think about this please? |
Re: Solar Energy, A Complement To FTA by Abdomox: 10:51am On Oct 16, 2020 |
babniyen: No it is not. 100AH 24v = 2400 Watt Hours 200AH 24V= 4800 Watt Hours That's to show you they differ in capacity. Only 100Ah 48V (if existing) can match 200AH 24V. 1 Like 1 Share |
Re: Solar Energy, A Complement To FTA by CAROLYN19: 11:24am On Oct 16, 2020 |
Contact us on 08066332919 for all sizes of Gaston batteries. Offices in Lagos and Abuja .Nationwide delivery
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Re: Solar Energy, A Complement To FTA by babniyen(m): 11:28am On Oct 16, 2020 |
Take into consideration the 50% DOD of Lead acid and 80% on Lithium. I am looking for usage comments. Abdomox: 1 Like |
Re: Solar Energy, A Complement To FTA by Penuelseun(m): 11:29am On Oct 16, 2020 |
babniyen:It should, longer service life but lesser backup time |
Re: Solar Energy, A Complement To FTA by GeorgeD1(m): 11:32am On Oct 16, 2020 |
babniyen: be careful bro, 200ah 24v lead acid is far higher in capacity compared to 100ah 24v lithium. don't get sucked in by the lithium hype. 4 Likes 1 Share |
Re: Solar Energy, A Complement To FTA by Abdomox: 11:41am On Oct 16, 2020 |
babniyen: Sure. The calculations did not factor DoD. It's just capacity of the batteries in watt. |
Re: Solar Energy, A Complement To FTA by saint2ace(m): 12:13pm On Oct 16, 2020 |
GeorgeD1: I totally agree with this comment. Experienced it first hand, the back up time is not at par at all. The only compensation I see is longer shelf life... 2 Likes |
Re: Solar Energy, A Complement To FTA by ceaser: 12:31pm On Oct 16, 2020 |
babniyen: With this reply of yours, I'd say you already know 95% of the answer to your question. I guess you need more inputs to validate your conclusion. The 50% DoD of Lead acid is a disadvantage when it comes to comparing it with the 80% DoD of LFP, even though you may also not want to deep discharge your LFP to 80% DoD too often in order to further prolong it's service years. LFP expectedly has longer cycle life than the average Lead acids available out there in our market. So yes, I'd say go for the LFP in place of LA, provided your source of LFP is reliable to give true capacity of the product. 2 Likes |
Re: Solar Energy, A Complement To FTA by NiyiOmoIyunade(m): 12:48pm On Oct 16, 2020 |
Assume 80% DoD for Lithium and 50% DoD for Lead Acid. 24v 100Ah Lithium * 80% is 1.9kwh useable energy 24v 200Ah Lead Acid * 50% is 2.4kwh useable energy. If you were running a 240watt load and you have the means to cutoff precisely at DoD limit (think decent inverter or external device) your Lithium bank will run 8 hours before it concs out but your Lead Acid will run 10 hours - you get 2 extra hours from the Lead Acid. So 24v 125Ah of Lithium at 80% DoD is equal to 24 200Ah of Lead Acid at 50% DoD. In practice, there will be those days when you need that little extra juice and you can still get 1.5kwh extra from your 24v 200Ah lead acid bank (deep discharge) but your 24v 100/125Ah Lithium has long since been fully spent and conced out and stayed dead till next recharge. That is why I have a 48v 800Ah LFP bank and still took it to 1000Ah and still counting - those rainy days and heavy demand days do come - it is much easier and cheaper to oversize lead acid than Lithium. The benefit of Lithium is superior stability and relatively longer life if used within its design tolerance. That said, a Lithium bank properly used tends to have a higher chance of delivering on the promised life span than a similar lead acid. This is due to the BMS and balancing circuits to a large extent as well as the chemistry. babniyen: 9 Likes 1 Share |
Re: Solar Energy, A Complement To FTA by babniyen(m): 1:52pm On Oct 16, 2020 |
Thanks everyone. I can see clearly now... |
Re: Solar Energy, A Complement To FTA by ojeysky(m): 2:41pm On Oct 16, 2020 |
babniyen: If it's actual 100AH LFP go for that instead, assuming you have appropriate charging mechanism 1 Like |
Re: Solar Energy, A Complement To FTA by ojeysky(m): 2:42pm On Oct 16, 2020 |
Abdomox: It is if you are working with acceptable DOD on both chemistry |
Re: Solar Energy, A Complement To FTA by ojeysky(m): 5:43pm On Oct 16, 2020 |
NiyiOmoIyunade: Yes the chairman himself has given it a better analysis. Though I still think it's only a 30%DOD of lead acid that will be equivalent to 80% DOD of LFP especially when it comes to matching cycles. |
Re: Solar Energy, A Complement To FTA by adrusa: 5:52pm On Oct 16, 2020 |
babniyen: As I have said here many times, unless your load is very small, your lead acid is likely to die before you get to 50% DoD due to voltage sag and inverter cut-off. So, don't be deceived by the 200AH of lead acid battery, it is a mirage, you can never get 200Ah out of that battery in real life. LFP on the other hand will give you its name plate AH and then a little more since they are usually mildly underrated. 3 Likes |
Re: Solar Energy, A Complement To FTA by Abdomox: 6:28pm On Oct 16, 2020 |
ojeysky: Even with DoD, 50% of 4800WH and 80% of 2400WH are not the same. 1 Like |
Re: Solar Energy, A Complement To FTA by zeestone99(m): 7:10pm On Oct 16, 2020 |
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Re: Solar Energy, A Complement To FTA by ojeysky(m): 7:30pm On Oct 16, 2020 |
Abdomox: I actually did a follow-up that a lead acid will only be close if it's 30% of 4.8kwh and 80% of 2.56kwh LFP 1 Like |
Re: Solar Energy, A Complement To FTA by Malevonent: 8:58pm On Oct 16, 2020 |
ojeysky: ![]() ![]() ![]() For me, unless he has a high wattage load he wants to run for a few minutes at intervals, i would recommend lead acid, if he can lay his hands on 2v cells, even better. The ultimate dilemma is 2v 24pcs 1000ah (48v 1000ah) lead acid vs 3.2v 32pcs 280ah (48v 560ah) lifepo4 for a 48v inverter, for domestic use which is better/would you choose ![]() |
Re: Solar Energy, A Complement To FTA by GeorgeD1(m): 9:22pm On Oct 16, 2020 |
i really get amused when i see these postulations on paper how 50% dod of lead acid should be equal to 80% dod of lithium. even now we are seeing weirder assumptions of 30% being equal to 80% lead acid! i guess its fine when we do these abstract projections but we all know that in the real world things do turn out differently. having said that, i think the main attraction for lithium remains its expected longevity due to the possible many cycles as compared to lead acid. however, if my recent experience with my zenith batteries is anything to go by, it means lead acid when properly managed can also give many years of use without conking out (by the way, my guy who bought the used zeniths from me has had nothing but praise for their outstanding performance). quite remarkable given they already served me for 7 years plus as at the time i replaced them and sold them off. then, enter the hoppeckes, the exides, the sonnenscheins which promise up to 15 years of quality backup for their lead acid batteries and the attraction for lithium further takes a dive. while the lithium jingle continues unabated, my candid advice to newbies is to be wary of bogus promises from sellers intent on offloading their lithium wares on them. they will come up with several clever marketing tactics all intended to make a sale. if you're just starting off on the renewables journey, you will do well to stick with tried and tested products of which lead acid batteries is one example. you really don't need to dabble into lithium where you have to contend with a whole gamut of bos devices including bms, bmv, cell balancers, special chargers with lithium profile, inverters which have to be tinkered with in order to work with lithium, etc. the world is already complex as it is, you don't need to complicate things further just because you want to provide reliable uninterrupted power for your household. go with what works out of the box. a word is enough... 17 Likes 2 Shares |
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