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Everything posted by Tersius

  1. Yea NP. So that battery is quite big and heavy, would probably need to come and collect it. It weighs like 200+kg.
  2. I'm in Roodepoort, dibs allowed but if someone wants to take the whole system when it's time they get preference.
  3. emigrating vs immigrating pfft. Can't fix it either.
  4. I will probably be immigrating soon, hopefully in the next 3 months, will then be selling my kit for a bargain.My setup when bought new :12x300W panels R2000 x 12 R24,000 Bought them in 2015 so they still pretty new.Flexmax 80A MPPT R12,160.00 No Warranty15/11 Freedomwon Lithium Ion R103,580 - Got a 9 Year Warranty Left, Cycled it at an average of +-40% DoD rated for 70-90% DoD8/16 KVA Hybrid MLT Powerstar Inverter R62,992.77 Six month on certain parts.Combiner box + cables + mounts + Battery Controller. +R5000Price When New Total at least R207,732Thinking of asking a very reasonable price when I go. Post here if interested and to be taken into consideration.
  5. Hehe we lose quite a bit of water with evaporation so have to keep the damn thing topped up all the time.
  6. The idea is to try and minimize human intervention, covering up or removing tubes are an ineffective way of reducing the heat and backfires on cloudy days. That looks promising, I have the TSE version installed. Will call them and ask if that model can do the same thing.
  7. I've got a 32 tube system heating water in a 200l geyser. I would like to connect some sort of relay-valve and monitor the temperature and then open the valve if say the temperature goes above 75 and close it if reaches 65 degrees. At the moment I'm just covering 12 of the tubes in summer but then on cloudy days the performance is not so great. What would be the most reliable way of achieving this? I've got a geyserwise so would be awesome if one could plug into the sensor for that. I'll dump the extra hot water into the swimming pool as I have to top it up with water anyway.
  8. Interesting I'm in the process if switching to prepaid, because my power bill is R100 a month vs the +-R500 connection fee. I also have solar. Please just help me to understand the details of the no-prepaid rule. My DB is split and I have another DB for everything using the inverter. So just to understand once you are on prepaid the inverter can never use AC to charge the batteries? Or are there some instances that it is allowed? Inverter is NRS097-2-1 compliant though. I've got a big lithium bank so I could technically just unplug my inverter from the AC as it's using those industrial grade high amp plugs to feed in AC.
  9. NERSA withdrew the draft, working on a new one. https://www.moneyweb.co.za/news/south-africa/nersa-to-withdraw-plans-to-register-rooftop-panels/
  10. Yea the inverter can already tell me what the total usage is etc. So gonna buy two of these SonOff devices and start measuring. Might re-purpose one to the pool pump.
  11. Had a look at the effergy they cost about R1300. This looks like a very nice solution.
  12. I'd like to measure some appliances in the house so I'm looking for something like this kill a watt meter that I can buy. Don't want to spend too much. Unfortunately that one is on back order of almost two months. Any other suggestions?
  13. Hi I should have mentioned I'm in Johannesburg Roodepoort area. For collection by someone in the area, otherwise it won't be worth it. Some suggested R200 per dead battery and R300 for working ones. As I don't want to test which ones are working or not I will sell all of them for R2000. Which averages out at 4 dead batteries and 4 good ones. I'm sure at least 4+ should be usable.
  14. I have eight of these batteries just sitting here. I suspect there are one or two batteries that are bad and the others should be good for a couple more cycles. They were only used as backup and probably cycled less than 50 times. Want to get rid of all of them. http://www.greenotech.co.za/assets/omnipower-battery.pdf They rebranded the 100ah 30kg as a 120aH along the line. Make me an offer.
  15. That's what I'm looking for, as the Freedomwon bms has analog out to stop charging.
  16. I take it you can turn off the MPPT using an analog signal looking at the specs. https://www.victronenergy.com/upload/documents/Datasheet-SmartSolar-charge-controller-MPPT-250-60,-250-70,-250-85-&-250-100-EN.pdf Remote on/off Yes (2 pole connector)
  17. In the near future I want to expand my current array and add a west facing array to the current north facing array. I'm looking for MPPT that can take a high voltage input so that I don't have to run thick cables as the west facing roof is further away than the current array. I found the MLT Nomad that looks attractive so far. Can go up to 350V input. They go for around 14k which is not cheap but not unaffordable either. Any others? On a side note, for these prices it feels that buying several Axpert inverters are almost cheaper It's a pity there are so few high voltage MPPTs Edit: The MPPT should also have some analog input to stop charging.
  18. So by the sound of things I think everything is actually correct then. I think the inverter is correctly doing the switch over etc. Never saw any settings for it. The powerstar sort of uses source and battery at the same time depending on load/battery SOC/solar output and Eskom availability. I suppose the axpert also does this balancing act.
  19. My setup was tripping the "main" earth leakage before the inverter so just moved the inverter off the feeding earth leakage. It still has it's own earth leakage after inverter output, but the inverter it self is now without EL protection... The trips would happen when there was a high load on the inverter that switched off, then the inverter would briefly push that current into the source and then the EL would trip. The old EL is very sensitive though, any sort of heavy weather and it will trip, maybe time for a new EL?
  20. So been running the system for about two weeks now and got most of the settings sorted out. My current setup thus is an untidy bunch consisting of: 3600W Array of 12x300W Panels Outback Flexmax 80 Charge Controller MLT 8KVA Powerstar Inverter Freedomwon 15/11 battery. A battery controlled 100A contactor that disconnects the solar panels if the battery disconnects, required because the MPPT does not turn off quick enough and might damage inverter if battery is not present to provide voltage reference. The battery provides canbus and several analog outputs of which two provides SOC % and max charge current % because the powerstar does not have canbus. Inverter is setup to allow draw from battery until 45% SOC after which it floats the battery and switches over to eskom to power the load. If power goes off it will allow it to run down to 30% SOC before it will shutdown. The battery self will isolate by 15% SOC. The battery uses an Orion BMS Jr. I can interface with it via a USB to Serial cable and the provided utility to see lots of different battery details such as SOC, Cell Voltages, Avg Temp etc. Can also modify the settings. (Probably means voiding your warranty though). The battery was delivered in a wooden crate and it took 4 men to carry it inside the room since it weighs about 154kg, it was hanged on the wall after some effort. It has a SOC bar display, reset and breaker on the front, serial connector on the left, DC, CAN and Analog out in the right. In the last two weeks we averaged about 35-45% DoD which is about 6kw during the evening, the array quickly recharges the batteries and on sunny days the battery is 100% around mid day. Price wise I was lucky to have gotten dealer prices and I was able to claim back VAT, so it came in at +-R6500/kW ex or [email protected]% DoD ex. So one major CON for the battery is price. For a normal home user the price would have been R8,664/kW incl. or [email protected]% DoD incl.. At that price point the Bluenova and Pylontechs batteries blow it out of the water, but I was lucky. Also their factory is 5km away from me. They warrant the battery for 10 Years or 3500 cycles at 70% DoD. At the end of life it will then have 70% capacity left i.e. about 11kw. I'm cycling it at less than 50% so it should do about 20 years and 7000 cycles. What is quite nice is that I can later trade in the battery and Freedomwon will give you discount on a larger battery based on the pack age and cycles done. So it opens up an upgrade avenue. It can also parallel with 3 more for a total of 4 batteries or 60/44 capacity, recommended to rather upgrade after 3/4 years instead of adding more batteries. All in all I'm happy with what I got and time will tell how it performs after 10/20 years. Specs :http://www.freedomwon.co.za/images/pdf/litebatteryspecsheet.pdf . Freedom Lite Installation Manual Rev 5 (1).pdf
  21. One of my fears as well. I also shut off the mains, earth and inverter breakers. But with a direct strike that won't matter.
  22. Just an update the battery was installed last Friday and most of the house has been running "off-grid" for an average 50% DoD. Solar panels are now finally showing their full potential instead of the instantaneous use which used to give about 7-10kW per day the array is now doing 15-20kW per day to charge up the battery. Ovens, stove and solar geyser and one kitchen plug still on Eskom.
  23. Rubicon has stock. R100 ex VAT. https://solar.rubiconsa.com/index.php?route=product/search&search=3011
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