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Dougiedanger last won the day on March 15

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About Dougiedanger

  • Birthday July 5

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    Chegutu, Zimbabwe

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  1. Not sure who has come across this on Supersport? Second round on today and is a very interesting format with some big racing names involved. A electric racing SUV with a difference, amazing how they throw them around and how they perform. The have a 40kw usable battery developed by Williams Advanced Systems. Just thought this would be of interest for some forum members!
  2. Hi @JpPaulKrugerI have a Must which is very similar to what you have and also experienced the same sort of issues. I have set mine up on either SBU or SOL they both seem the same and don't seem to do anything different. I choose to not charge from the Grid and have set my Go to Grid setting to swap to utility when my batteries are at about a 75% SOC. By setting the Go back to battery(Or something like that) setting to a higher voltage, say 28V(on my 24v inverter) this prevents the inverter cycling if the voltage raises slightly after the load is taken off. Not sure if this would work for you however if you can get ICC I think that would be a win, just wish they could get my inverter on their list!
  3. Hi, what sort of load are you drawing on the inverter, ie how many Watts? Do you have panels attached to this setup? How old are the batteries? Unfortunately in my limited experience it is usually a sign of the batteries being on their way out.
  4. If the inverter is set to use Solar when available, it will use solar supplemented by battery power when the solar yield does not meet the demand requirements. That means if it becomes fully overcast the battery will provide most of the demand until it reaches the preset low voltage back to grid value. Yes it should be on the data sheet
  5. Think you would need to be cautious with this from solely a battery point of view. Assuming that is a Pylontech it is recommended to only discharge them at 0.5c, even at 1C you can only draw 2400w max, so if you are distracted when one of those bigger ones is on and it clouds over you would be pushing the battery close to its maximum rated discharge.
  6. Sorry @nelian, I unfortunately learnt the expensive way that lead acids are not properly protected by the average inverter which uses battery voltage to guess at the SOC which is never accurate. Due to also purchasing a 24V inverter (killed my first set of lead acids inside a year, due to similar reasons) and finding that 24V lithium batteries were not readily available to replace them with, I had to stay on the lead acid path so opted for Trojans that have a good track record on handling some abuse and coupled that with a battery balancer and bmv to protect them. So far happy with my decision but had I been on this forum longer when I made the call, I may have thought more about dumping the 24V inverter and upgrading to a 48v one so I can could then explore getting a lithium battery instead of staying with the lead acids which need more attention.
  7. @Achmatand myself commenting at the same time, basically your inverter size will tell us how your batteries are setup, either 24v or 48v. That will give you the size of the battery bank, which is basically the same in watts, either 24v x 400ah bank or 48V x 200ah, ie 9600w. As stated never take the batteries below 50% SOC so useable capacity is 4800w, or 10.5 hours at a 450w draw. However note that the lifespan of these batteries will be severely compromised by drawing to this level regularly. Also the inverter will not be able to determine SOC accurately and so it is highly recommended to have BMV to do this and to be honest a battery balancer. The inverter may well run these batteries to a lower SOC than 50% which will cause more or less permanent damage if done several times.
  8. You won't have 800ah, in series add voltage ie 12v x 4 = 48v (if your inverter is a 48v model), then ah stays the same at 200ah.
  9. Please confirm, you say a 5Kva system, is that a 24V system? That would be quite unusual... Just reading into saying you have 4 batteries in total and 2 were purchased bout 6 months ago. I have a similar system but on a 3kva, 24V inverter with 4 x 205ah batteries. That gives me a bank of 410ah. I also draw about the same watts as you at night and my setup will give me 12 hours at that sort of draw to a 50% SOC. I did this last night for the first time due to an unexpected fault. Normally I tend to draw about 30% out of my batteries on a daily basis just to get round poor incoming voltage from Zesa in the early evening. As you will see elsewhere in this forum, you can kill lead acids very quickly by drawing them down too deeply(like I did last night).
  10. It can't hurt. I am in Zimbabwe and have learnt a great deal from this forum which has assisted me and where and when I can help others ask the right questions. It seems that this industry is a great opportunity for average electricians to make a quick buck by selling and installing a system that works ok initially and fails within a very short time but by then they are long gone or by then can hide behind a multitude of reasons that are blamed on the customer. I am not an installer but have enjoyed my solar journey as most have here and am always looking towards what I can do to improve my system, but it does irritate me to see people being advised and sold systems that are so clearly not sized or configured correctly for their requirements.
  11. Hi, have found this data sheet on the web. This suggests that your batteries should be set up very similar to mine, with the exception of the max charging current which is set at 30a. What settings are you currently on for 11, 17 and 18? Is the temperature there more or less 25C where they are installed and do your independent voltmeters differ to the Must screen battery voltage? vision 100ah.pdf
  12. Good afternoon @Dollos1 I will post them below, however you will need to set up your own charging settings as per the data sheet for your batteries 5 - BLU 14. - USE 17. - 28.4 18. - 26.4 19. - 22.8 20. - 24.4 21. - 25.3 Please bear in mind my settings are for Trojan Sagm 205ah batteries and are compensated for the inverter voltage error as well as temperature. My inverter and battery location is generally warmer than 25C. What batteries do you have as set up needs to be specific for their requirements?
  13. Our situation here in Zim every evening at peak demand in the evening, power all the way down to 165v due to us being on an overloaded transformer. Saying that my Must inverter seems to handle it fine in 3 years of use, passes through the low voltage so appliances take stress, however I have no doubt that it is not good for it
  14. Good Morning @Dollos1 This forum has helped me a great deal, a wonderful community to be part of. Coulomb might be able to add more here but basically when the voltage is above the preset value in setting [20]the inverter will disconnect from the grid and use solar and or battery to power the loads. When the voltage drops below that set point it will reconnect to the utility supply if it is available and power loads from that. The batteries will then recharge depending on what you have selected in setting [10], ie either by solar[OSO] the next day or grid immediately [SNU or CSO]. Setting [21] then tells the inverter to go back to using the battery or solar when the battery voltage exceeds this value. I have a couple of personal reasons for this. I had purchased a set of Trojans after I killed my first set of batteries due to my lack of knowledge, Trojans are quite good batteries but expensive, however they have quite a good lifespan according to the data sheet so I have opted to use them relatively gently in order to recover so of their expense through saved power costs. I also have extremely poor low voltage power supply in the evenings from the utility so my using the inverter I keep my power voltage constant and protect my other appliances. My 'sweet spot' is the amount I draw out can be replaced by solar only the next day to get the batteries back to full, without having to use Utility power to achieve that. It also means that I leave about 80ah of emergency capacity to draw down in the case of an unexpected Utility power loss, which wont take my batteries below the 50% SOC threshold (Setting 19 is configured to cut off at this point as well as my BMV) Firstly how do the independent voltmeters compare to the inverter display voltage? I would definitely get a BMV as well as a battery balancer. For me that was sound advice that i got from this forum. Lead acids are very sensitive to abuse and the Must inverter does little to prevent that abuse from happening. The BMV is far more accurate on monitoring the SOC and preventing you over discharging your batteries and the battery balancer will keep each battery balanced which prolongs their lifespan. My first set of batteries barely lasted a year due to my inexperience and not having the setups on the inverter correctly configured. Yes I use the SOL option generally however I do not use the CSO setting as what happens is at night when it reconnects back to the grid, it immediately charges from the grid and therefore defeats me trying to save power use from the grid, so I keep it set on OSO and I have to be aware that when I leave the house in the morning if the weather is looking overcast then I need to reconfigure the inverter to recharge from grid. Not an ideal system but am working with the limited options the Must gives us. Hope this helps...
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