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Rooney Hat

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  1. @SiliconKid Found this post while looking around for battery discharge on AC bypass, seem to be following in your footsteps I know about the 100% to 95%, but do you still have the issue of a slow drain on the batteries while in AC bypass? I've picked up a 0.8amp drain using battery view.
  2. So I have disconnected the faulty battery and have left a single US300c connected. I noticed that once in bypass, the batteries continued to discharge at around 50w, I thought this was due to the faulty battery, but even now with just the working one connected, it still appears to be discharging at 0.8 amps according to battery view. It looks like that is what was causing the Inverter to turn off overnight because it was getting to the low voltage cutoff. Anyone else know what could be causing that or have the same issue? I have the custom BMS and custom Console cable connected, but I doubt that could be causing the drain. Though I'll try testing.
  3. Apologies, I just saw the manual, and it states the charging voltage is 13.6-13.8v, that's pretty much the same as my old AGMs... seems odd, but ok, but it doesn't indicate float voltage. I assume that should be the same as charge v, and that is higher in AGM standard settings. So it might still be best to have it as USE setting with float and charging at the same. So with two of them, it should be 27.2v - 27.6v. But I am in no way an expert, so I would get an expert opinion.
  4. So looks like it's a faulty BMS on the battery, I'll be sending it back. Had to manually crimp a RS232 cable to connect to console on the battery. And I found the 1 battery only gets to around 90% charged before it appears to do nothing while the other one charges. Another thing I spotted was the temperature increases much higher than the other battery while charging.
  5. Late to the party, not sure if anyone has replied on this. But you should not be using AGM settings for these batteries. AGMs charging and float voltages are way higher than Lithium. I believe the max you should be using is 53.2v float and charge. So it will likely be USE setting.
  6. Hmmm, My 21 is set to 5% and my switch back was set at 10%... But I can try some testing over the weekend to double check... As it is, I have had my my switch back at 20% and the logs are telling me it drops to 15% before switching back to mains, so maybe it at 10% it still dropped past that to 5% then did the cutoff. I'm on the latest GW firmware, so not sure why it's doing that. Maybe I should re-crimp another cable that has 12345678 -> 876456321, as it is I cut the other pins except 12 and 3 (ground).
  7. Damn, that's pretty annoying... losing all that afternoon sun. Maybe with some smart timing, I can turn my geyser on for a bit longer and have the last of the afternoon sun get the batteries as close to 100% as possible. Have also set my cutoff to 20%, will see if the low voltage kicks in again tomorrow.
  8. I just upgraded my 4x AGM to 2x US3000c on my Growatt SPF 5000TL HVM. After following the guides (Thanks to everyone who struggled with this and provided the help), I did the following: 1) Created the network cable with pin 1,2 and 3 reversed to 8,7,6 the other side and cut all the rest. 2) Set the ADD to 0001 (reversed, it's pin 1 on, rest off) 3) Left the slave battery on ADD 0000 and connected it to master with a straight cable. 4) Set the Back to Utility to 10% (I am assuming with the 95% DOD I can safely set this to 5%) 5) Set the Back to Battery at 95% (Going to fiddle with this number so I can use solar to power load and charge at the same time instead of using mains to power load while the solar charges to 95%) Everything appears to be working except two things 1) Every morning when my batteries drop below 10%, the Inverter powers off after around 5 mins of low voltage warning instead of switching back to utility. (I found some Pylontech US3000c guide stating that on Growatt SPF 5000TL you must not set back to mains below 20% as it will cause a low voltage warning, but I lost the link to that guide to make 100% sure) If that is correct, that means I can't really take advantage of the 95% DOD of these new batteries, and that sucks. 2) Since being on these batteries, there is something odd happening in the afternoon where it charges the batteries to 100%, then puts all load on the batteries and ignores the solar completely. Have no idea what could be causing this. I am on SBU with OSO charging. Anyone else getting these issues?
  9. Absolutely something to consider, But would have to pay around 40k to get to 8.something kwh 80% DOD in Lithium, or just spend 20k to double AGM capacity from 4 to 8 200ah. getting me a total of 19.6 (9.8kwh with 50% DOD) with the idea that I wouldn't use that amount every night thus extending the battery life of all. Provided they don't fail me.
  10. Haha yup, definitely doing the weight training. If I knew then what I know now, would have given the AGMs a skip. Though for capacity sakes because I already have 4, I could consider doubling down and getting 4x extra 200ah batteries would give me about 9kwh @ 50% DOD... provided they stop becoming duds. This would push me through the night, but introduces the 3kw load the geyser has at 5-6am Much to consider! Just got confirmation that they swapping out for new battery today. So I'll see how it goes!
  11. Thanks, totally appreciate it! As you said, people just throw more capacity and don't consider what kind of loads are intended for the batteries and how it hurts these new affordable batteries that everyone jumps on. My original plan was to get the AGM and upgrade to lithium in a few years when they are cheaper. But I get the feeling that's biting me in the ass now.
  12. Totally agree, I started from scratch during lockdown and did everything myself with 0 knowledge, If it wasn't for the guys on this forum, I'd be lost
  13. Calculated at my current usage, they should be nowhere near their end of life. 1) Batteries are not in a confined space and have good breathing room. So I don't think they go above 25 degrees, might go a bit over in summer. 2) I only discharge to standing 48/49v, should be roughly 50%, rough calculations should get me at least 3 years of life. 3) Charge and Float v are on the within the safe values for the batteries. On an average day, they will only discharge to 50% once at night and might have a bit off usage during the day to offset Solar. (And I know I asked about the 4kw load, I don't think my batteries have ever had to do that kind of heavy lifting due to the times I set for the geyser. I think the most they get hit with is 2kw from the kettles at night.) The faulty battery is getting replaced though, So all batteries will be in working order. I asked around about my problem and someone recommended a balancer, and after looking into the HA4, sounds like a very useful thing to have and should extend the life After I bought the system, After 2/3 months I noticed something was off and It took me a while to figure out the issue was one of the batteries because the inverter was balancing the voltages while charging, only picked up that 1 battery's voltage was 1/2v off when I disconnected the batteries from the inverter after they had been discharged a bit. Then a month later, discovered the brand new battery and one of the older ones had the same issue. and then last month again another one down. Can't figure out what it is, so I have re-crimped all my cables and ordered the balancer now. When the replacement gets back, I guess I'll see how long it lasts.
  14. Thanks, this is very good to know! Makes a lot more sense. I am not a fan of the voltage measurements of the AGM to determine battery %, but the safe zone is that 50% is a little under 49v, so I have it set to a cut off of 47v (As the load drops voltage by 1/2) Then it settles back up at 49%.
  15. You Legend, thanks! Yup, totally agree, hate hitting batteries with heavy loads. They just offset what solar can't carry during the day 12pm to 2pm, So unless we have 0 sun, and the batteries have somehow gotten back up at 54v, it will use Eskom on those days. Just wanted to be sure because I am having issues with my AGM batteries, 4 faulty in the past year. (Voltage off causing the combined voltages to drop) Just re-crimped all my cables again, confirmed equal cable length and have ordered a HA02 battery balancer. So hopefully it doesn't happen again... getting tired of lugging these 60kg batteries back to the supplier.
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