SiriS

Hi, no this morning was an exception as SOC dipped below minimum due to load shedding, so grid charged back to minimum SOC. Generally batteries are fully charged by solar in the morning around 10/11am and then stay 100% until at least 6pm in the evening.

Better voltage graph.

Morning, after a firmware update...no change. Happened this morning again. On 2 x 5kwh batteries, my SOC went from 38% at 4:46 to 18% at 5:06. In other words dropped 20% SOC in 20 minutes at average 450w load. According to my calc I should have only dropped 1.5%. Voltage remained around 52, which according the LifePo4 voltage charts indicate a SOC of 40%. This morning for the first time though I noticed the battery lights are out of sync, right (Master) battery) 2 green lights and left (Slave) battery on 4 lights (inverter indicating 35% SOC). I've run out of technical expertise...so would this indicate a BMS issue or a faulty cell issue in perhaps the Master battery? Unfortunately I'm at the stretched limit of my tech knowledge here... 🙃

Txs, inverter is Sunsynk and I definitely do not have enough technical knowledge to comment on BMS capability and whether SOC is actually 100% (interestingly enough, inverter/app always shows 99%, never 100%). I was wondering if it is a battery health issue, as the 40-20% SOC is often induced in the morning when the main geyser goes on. But my understanding is that discharge is non-linear so doesn't impact the same particle cell(s) all the time? My installer did a firmware upgrade yesterday, so I will keep monitoring. According to the installer, a year ago Sunsynk was the best thing ever. Now he says they're absolute 💩 🤦‍♂️.

installed about a year ago

Morning, I have 2 x 5kw = 10kw Sunsynk batteries installed. Lately I've been noticing a faster than expected drain at the lower end of SOC. See attached for example this morning: In 10 minutes the SOC went from 38% to 16% i.e. 22% drop on a 2500w load. In my mind a 10 minute load at 2500W should mean roughly 400w or 4% of the battery? So what could be causing the faster than expected drainage, battery health? Thanks

Morning, I noticed today that my Sunsynk inverter is not showing my 2nd string PV data anymore (no real time, no history). The 2nd string is active and producing, so only an interface/data issue. It shows on the inverter display, but not on app or website. Anyone with similar issue and suggestions to resolve? TIA

Thanks everyone for all the very instructive replies. It seems like shading might be the culprit after all - the parapet is slightly higher than the bottom of the solar panels, so it is a creating a small shadow area. Very small, but substantial impact! Back to the drawing board to try to solve. Thank you 🙏

Thank you, I didn't consider that. I assumed 9 panels per MPPT, but I could be wrong maybe it is 12/6 like you suggest. That would certainly explain the often double output at higher watts and maybe more pronounced now in autumn as you say. Food for thought, further investigations will need to be done, thank you for your kansvattery PS the lower level panels are my neighbour's

Thanks, going to monitor a bit and then have my installer check for me if I can't solve.

Hi there, some advice for a noob please. I have 18x545W = 9.8kW panels. I don't recall how the 2 MPPTs are arranged, but for the last 2 months they have contributed roughly 50% each towards solar input every time I've checked (which is often ) Today, for the first time, I noticed a big discrepancy with MPPT2 producing almost half of MPPT1. I've also attached the Sunsynk app input charts, but not really understanding it and whether it indicates an issue. It does look like there is a big discrepancy between the 2 MPPTs though. I just climbed up the roof, there are no shadows, the whole array faces slightly East of North. It is now 14:15 so sun is NW. With the solar panel layout I also wouldn't expect substantial production differences? Appreciate any advice and possible reasons for difference. Thank you! 🙏

Hi, pls help. Why at 21:30 would the inverter be pulling from grid and not battery? Battery SOC at 60% and system allowing to go to 40%. Thank you!

Hi no issues after the firmware upgrade.

ok thank you, I have peace