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Nairaland Forum / Entertainment / TV/Movies / Satellite TV Technology / Solar Energy, A Complement To FTA (2101361 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 saint2ace(m): 9:45am On Apr 09, 2020 |
Abigai: Connection mode is the same for both, the only difference being the battery capacity |
Re: Solar Energy, A Complement To FTA by NiyiOmoIyunade(m): 10:07am On Apr 09, 2020 |
Both diagrams are not ideal because they are taking power to charge source or power loads from the same side of the battery bank - cable resistance through the battery links will mean less current to the lower portion of the battery bank while charging and more strain on the upper part of the battery bank while discharging. Ideally you should move either the positive or negative inverter cable to the lower part of the battery bank so that positive and negative cables are tapped from opposing sides of the bank. In a pro install, you would not parallel the two 24v banks directly but rather keep each bank separate and independent and connect each bank directly to a suitable bus bar for positive and another busbar for negative. You would then tap the inverter positive and negative connections directly from the bus bars. Abigai: |
Re: Solar Energy, A Complement To FTA by Abigai(f): 11:04am On Apr 09, 2020 |
NiyiOmoIyunade:Oga Niyi pls can you show me a diagram that will further guide me. thanks 1 Like |
Re: Solar Energy, A Complement To FTA by mctfopt: 3:44pm On Apr 09, 2020 |
Abigai: I think this is what he meant 1 Like 1 Share
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Re: Solar Energy, A Complement To FTA by NiyiOmoIyunade(m): 6:28pm On Apr 09, 2020 |
Yup! Thank you very much. Madam Abigai should please keep cable lengths as short as possible and use at least the mininum spec'd cable sizes or better still go for an even thicker cable size and all should be well. mctfopt: |
Re: Solar Energy, A Complement To FTA by mctfopt: 7:22pm On Apr 09, 2020 |
NiyiOmoIyunade: Awesome. Hehe. Happy to help. Madam Abigai, food don ready. |
Re: Solar Energy, A Complement To FTA by adrusa: 7:53pm On Apr 09, 2020 |
Abigai: The two pictures are the same. |
Re: Solar Energy, A Complement To FTA by Malevonent: 9:25pm On Apr 09, 2020 |
am thinking of replacing my 8 x 12v 200ah smf battery bank soon, as am tired of trying to keep them all balanced, 1 or 2 will usually drift off, and cause problems for me.. HA02 is connected, but doesnt seem to be doing anything, except emitting a high pitched sound so whats the cost of an equivalent LIPO4 Bank that i can use to replace tis 48v x 400ah smf bank, is it true that a 48v 200ah LIPO4 is an equivalent replacement?? |
Re: Solar Energy, A Complement To FTA by ojeysky(m): 12:07am On Apr 10, 2020 |
Malevonent: Yes it is if we look at it from the safe usable capacity perspective. However I will suggest you go for a 48v 300ah but if your budget has muscle then do 48v 400ah. On the price aspect, I will say it all depends on what you want in a Lifepo4. I can tell you I know someone who sells 150ah for 550k which means 300ah at 1.1m 2 Likes |
Re: Solar Energy, A Complement To FTA by NiyiOmoIyunade(m): 12:23am On Apr 10, 2020 |
I can say with a fairly high degree of confidence that lead acid 48v 400Ah is not generally equivalent to Lithium 48v 200Ah. The issue is with the DoD assumption - lead acid generally at 50% and Lithium at 100% - discharging a Lithium battery to 100% is not practical if you want the bank to go to 4,000cycles and above. 80% DoD for Lithium is a reasonable use case in which case 48v 400Ah of Lead Acid at 50% DoD is equal to 48v 250Ah of Lithium at 80% DoD. One thing people forget is that battery charging is actually a chemical reaction potentiated by electricity - if you let your Lithium battery get discharged to low voltages, dangerous chemical reactions occur which degrade the battery significantly vs lead acid. A lead acid battery may survive several ultra deep discharges with some capacity loss, a Lithium battery may not survive more than one deep discharge without serious degradation - it may be rendered unuseable and require special handling to be brought back to life at all. There is also the matter of emergency use or special situations, a 48v 400Ah bank may be taken occasionally to 350Ah discharge in an emergency e.g additional loads with guests in the house. A 48v 250Ah Lithium bank has no surplus capacity for extra needs except you upsize at significant cost - you cant pull 350Ah out of a 250Ah battery, the battery would have conced out long before. Malevonent: 7 Likes |
Re: Solar Energy, A Complement To FTA by ceaser: 4:18am On Apr 10, 2020 |
The spambot has gone mad again! |
Re: Solar Energy, A Complement To FTA by ceaser: 4:22am On Apr 10, 2020 |
ceaser: |
Re: Solar Energy, A Complement To FTA by BetaTechnicians: 7:20am On Apr 10, 2020 |
NiyiOmoIyunade: I like this comparison |
Re: Solar Energy, A Complement To FTA by BetaTechnicians: 7:23am On Apr 10, 2020 |
[quote author=ceaser post=88278491][/quote] I believe you know the right thing, you just dey find someone with real-life experience, I'd advise that you stay within set limits. |
Re: Solar Energy, A Complement To FTA by eleojo23: 7:30am On Apr 10, 2020 |
ceaser:Your usual customer |
Re: Solar Energy, A Complement To FTA by n9jaboy: 8:19am On Apr 10, 2020 |
n9jaboy: I guess I am on my own |
Re: Solar Energy, A Complement To FTA by ojeysky(m): 8:20am On Apr 10, 2020 |
Can someone kindly recommend a usb to serial adapter that actually works? The one have been using just intermittently stops transmitting data, unless I restart the pi. |
Re: Solar Energy, A Complement To FTA by NiyiOmoIyunade(m): 8:56am On Apr 10, 2020 |
This is a problem with the Pi and more especially with el-cheapo asian components sourced off Ali-Express. Your best bet is a regular scheduled restart of the Pi with say Cron? Or otherwise refresh/restart the USB subsystem via a script. Personally I would rather just restart the whole Pi say 2am everyday and refresh the entire system. At home I use a TP link router for internet with the main internet source being a FibreOptics modem provided by FiberOne, the Pi and other devices are connected for weeks at a time and the connection never breaks or freezes. So connecting via ethernet or wifi may be more stable than USB modem if you happen to have a spare router lying around. ojeysky: |
Re: Solar Energy, A Complement To FTA by mank1234(m): 9:00am On Apr 10, 2020 |
ojeysky: The one you're using, is it FTDI chip or prolific? FTDI seems to work better with pi. FTDI: https://a.aliexpress.com/_dVBA5Qm Prolific: https://a.aliexpress.com/_dWzZCBy 1 Like |
Re: Solar Energy, A Complement To FTA by ojeysky(m): 9:04am On Apr 10, 2020 |
NiyiOmoIyunade: I think same can be said for lead acid, you can't get up to a thousand circle at 50% DoD. So I think a fair equivalent will be a 80% DoD of 200Ah lithium and 30% DoD of 400 Ah lead acid. Even at that circle wise a lead acid will have died when a Lifepo4 is just getting to its 80% usable capacity.
Agree but really this is why folks need to have a way of monitoring their lithium cells, it's as simple as that. However lithium cells are usually rated below their capacity, so a 100Ah is actually 105 or 110Ah to give room for 100% discharge at 100Ah without negative impact on the battery.
While I agree with the above, I think it addresses just a scenario in the emergency use cases. Here are a few more: 1. A lithium will have been recharged and used at least twice while a lead acid is still going through her first round of charging. Imagine you have electricity/solar only for a few hours and you have the juice to charge your battery but you are limited to 0.1C (or max 0.2c) on lead acid 2. A lithium handles current surge better in an emergency/normal situation than lead acid. My washing machine does a 2kw surge, this normally trips my former 300Ah lead acid, but the story is different using my current 200Ah Lifepo4 3. We also need to recognize that the occasional below 50% DoD on lead may actually cost 3x or more in overall circle life. Overall I would still agree that it's a good thing not to get exactly 200Ah lithium just that my reasons and motivation for that is different. 3 Likes |
Re: Solar Energy, A Complement To FTA by ojeysky(m): 9:11am On Apr 10, 2020 |
mank1234: Okay I think mine is the prolific, so anyone with an ftdi for sale because AliExpress is certainly not an option for now NiyiOmoIyunade: No it's not for network connectivity, it's for inverter to pi communication. |
Re: Solar Energy, A Complement To FTA by mctfopt: 9:22am On Apr 10, 2020 |
Newbies will be like 4 Likes |
Re: Solar Energy, A Complement To FTA by eleojo23: 9:24am On Apr 10, 2020 |
mctfopt: It's a stage we all pass through. 2 Likes |
Re: Solar Energy, A Complement To FTA by mctfopt: 9:35am On Apr 10, 2020 |
n9jaboy: 2nos of 150ah 12v battery in a 24v configuration has energy of 3600wh or 3.6kwh. But lead acid battery can only at best has a usable capacity of 50%, that means you have half of that 3.6kwh ie 1.8kwh. Five fans are 30watts if we assume they run for 12 hours per day, it consumes energy of 0.36kwh or 360wh. So I think the battery size is good for such load. Now answering your question on whether you should buy a hybrid inverter or buy a standalone inverter and solar charge controller is solely dependent on your choice. Both can work with either public power supply or solar. This choice is dependent on you. You may choose a hybrid inverter or not. Though some like to believe that hybrid inverter failure rate is higher than the standalone due to complexity in the build. These are subjective factor which I'm yet to see a published engineering journal or research backing it up. So, whichever you decide to buy is solely dependent on you. Welcome to the club 1 Like |
Re: Solar Energy, A Complement To FTA by unicmarket: 9:47am On Apr 10, 2020 |
n9jaboy: Please can you clarify your question? 2 150ah battery ( auction, you mean— used? Do you mean you have an Hybrid Inverter? And if this is what you mean, It’s not usually correct to measure a used battery back up time; why simply because we may be able to tell it’s efficiency but I will state it’s ideal Back up time for a five numbers of a 30watts fan Which is 150watts About 23-24hrs backup if battery is new and good If you have lower than than this, it must mean your battery efficiency is reduced already www.jekitech.com 08031138665 whatsapp or call |
Re: Solar Energy, A Complement To FTA by adrusa: 10:05am On Apr 10, 2020 |
ojeysky: There is a major fallacy in the supposed usability of Lead Acid battery beyond 50% DoD. It is totally dependent on what load you have on the system. And this is where Lithium shines. While drawing up to 80% of its capacity, you still have very high voltage to keep your inverter on. But with Lead acid, the only way you can go that deep is if you are only pulling 2 or 3A depending on your total AH. If you are pulling any significant amount of current, you may not even get to 50% DoD before your voltage sags enough to shut down your inverter. Because of the way I use my system, I don't think I have ever seen a DoD of 50%. On rare occasions when I had deep discharges, the system will shut down once my water pump comes up in the morning in addition to my fridge and freezer. I sometimes have to temporarily take off the pump to prevent this. 3 Likes |
Re: Solar Energy, A Complement To FTA by essegis(m): 10:10am On Apr 10, 2020 |
mctfopt: I am at this stage when it comes to Lithium, no vex. Me too will soon catch up to all the phrases cos I've never used WiFi or USB for any of my inverters before. But of course, we learn everyday. |
Re: Solar Energy, A Complement To FTA by eleojo23: 10:13am On Apr 10, 2020 |
essegis: Most people on this thread will have to learn lithium from scratch since everyone seems to be facing that direction, myself inclusive. |
Re: Solar Energy, A Complement To FTA by adrusa: 10:14am On Apr 10, 2020 |
NiyiOmoIyunade: The Pi I use for my Victron products is rock solid. More dependable than my Outback Mate 3s. I use vitron oem cables though. I once used the prolific cables and while it worked, it was distorting my current draw. |
Re: Solar Energy, A Complement To FTA by ojeysky(m): 10:20am On Apr 10, 2020 |
adrusa: We are in the same boat Bro! Though I will say I can still pulled up to 10A at 50% DoD on my former lead acid but that's still not compared to the sustained voltage I get on lithium. Having addressed the price point, I don't think there is other motivation to keep on with a lead acid battery 2 Likes |
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