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viceroy

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Everything posted by viceroy

  1. Whoah did this train derail or what I really don't mind what I disconnect, be it AC or DC, whichever is better I will do, I just want a way to protect my batteries from discharging in the case that the SOC gets down to 50% (55% to provide a little safety net in the case of disconnecting AC, because as you say the Inverters will remain powered and drawing +-100W) So looking at TTT's pic, there seem to be two types of devices installed. Could you clarify which is what, and what I'll need to just cut the power. I'm not interested in swapping over loads from one source to another. If the batteries get to 50% the load must go.
  2. So this weekend we had a bit of a scare when the house did not switch over to grid at the scheduled time, and by the time we realised, the battery bank had discharged to nearly 50%. Now the BMV alarm would have gone off, but if we had not been home or by chance didn't hear the alarm, it could have been a disaster. Now I have no experience with relays, but I now need to install one to disconnect the bank if the BMV triggers it. Please advise what I need in order to do this. Thanks.
  3. Highly unlikely that two units should blow up due to an internal fault. If I was you I would double and triple check your wiring. As with some of the other guys here, I'm quite familiar with blowing up my equipment, most notably one of my Axperts, and it was entirely my fault, and basically came down to wiring the AC IN into the OUT and visa versa. Needless to say one loud bang, and some white smoke later, I was an Axpert down. Opening up the unit showed the DC fuse blown. As with you, there was no load on the unit, only batteries and grid being connected. So as I initially said, double and triple check your wiring before anything. After my debacle, I now religiously disconnect EVERYTHING and remove all fuses before even thinking of working on my units. Before reconnecting everything I check everything with a multimeter turning switches on in stages to make sure nothing is untowards.
  4. Will give this a go, maybe this weekend if I can free up some time. Being a SQL developer and data analyst myself, this could be what I'm looking for.
  5. Hi. This is what I used to calculate my C20 rate. http://planetcalc.com/2283/
  6. If you can stick to the 20% DOD then, you should be happy. My daily DOD is between 15 - 28% DOD but averaging around 20% and I'm hoping to get close to the 4200 cycles.
  7. Firstly, you need to be aware that the 260ah description is somewhat misleading. They are 260ah @ C100. In order to compare them to other batteries in terms of ah capacity, you need to look at the C10 and C20 rates which are: 200ah @ C10. 217ah @ C20. If you can get them for under R5k each, that's a decent price. I would advise against buying used batteries. A few members have burnt their fingers, and I'm pretty sure my previous batteries were used even though they were sold to me as new.
  8. Also have one of those sitting in a box. Was going to install it, but haven't as of yet. My stupid brain is just not getting around the logic of it.
  9. Looking really good. I was wondering why you disappeared off PVOutput. Now I know.
  10. Basically what plonkster is saying is that you need to put in more amps to the battery to get them back to 100% than you took out due to inefficiencies in the system.
  11. +1 to TTT's comments. And how do I get access to the private AICC section? I sent a request on the screen that appears when you try enter, but no response.
  12. You guys make me scared. I have my batteries in the garage right in front of my car. The batteries are VRLA Gel batteries, so I assume I don't have to worry about gassing unless something goes wrong...am I correct in my assumption, or would it be safer to park outside
  13. Is it "legal" to feed back into the grid in JHB?
  14. I'll join when I get to 5 outputs
  15. Thanks. For now I've upped the bulk voltage to 56V, but thinking I should go to 57.6V since that's what the battery says.
  16. So last night I found documentation on the batteries which has me shocked. Because of the summer (and car) heat in my garage, I had taken values according to the document from sinetech on my batteries and set my float voltage at 2.21V (53V) and the bulk at 2.31V (55.4V) However, actually looking on the batteries themselves and at the data provided on the sustainable website, I'm under volting the batteries at bulk stage. Can not putting enough volts in harm the batteries or shorten the life? Do Gel AGM batteries really like such a high bulk voltage compared to lead acid or regular AGM batteries. 2.4V ~ 2.45V in my case would be 57.6V ~ 58.8V. Seems Excessive to me. Temps are now dropping and constant monitoring the battery case temps show they remain reasonably constant at 25 ~ 26C, so I'd like to up the voltages from my current 53V / 55.9V to settings more in line with the temps, but I just wonder...
  17. Okay, well I'll play around a little with some settings, but if it's pretty much considered normal, then I'm okay with it. My tail current percentage is set at 1% and detection time is 30 minutes.
  18. Actually no, the actual values are 260ah @ 100C (not 20C like some sites were suggesting) and 200ah @ 10C
  19. I've seen 2 Axpert 5kva inverters with a battery bank of 16x 260Ah batteries, basically 1040Ah @ 48V. Just remember, if you are going solar, you'll need enough panels to charge the bank
  20. Using this calculator, I was able to determine a C20 rate My battery's Peukart Exponent is 1.13 From this, my C20 rating is 435Ah
  21. So I've followed youtube videos and looked at threads on here relating to setting up the BMV, and while it seems to work great, it's not behaving when within 3% of 100% SOC. Basically as the day goes by, the SOC rises and as it approaches 100% it gradually slows down. The volts go from bulk to float and then after a few hours at float, the SOC jumps from about 98.6% to 100% like it's been at 100% for a while but not realised it and suddenly jumps. Any idea what settings I should change to resolve this?
  22. How big are the two bedroom aircons? Are they modern inverter units, or older type? We have a 12000btu aircon which I wasn't not able to run off my 8kW inverters and batteries. The initial load when it switched on would drop the volts so dramatically that it tripped the inverters. I haven't tried with the new batteries yet.
  23. That sort of functionality would be great. How are you planning on doing it? By monitoring the rate of charge, and if it wont reach 100% by a predetermined time, then switch over to grid? One thing I would love in the software is a bit more flexibility in the scheduling, ie, being able to setup more times when one would switch over to grid, possibly linking in SOC to that, so for example if my SOC @ 16:00 is below 90% then switch to grid until it gets to over 90% or 20:00 (after high demand dinner time period has passed) Would be great for the upcoming winter period where I am already switching to grid when the geyser is set to come on @ 06:00 if it's not at temp, and if I could setup further grid times for early evening.
  24. Most definately not. The batteries are considered dead at 46V (open circuit)
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