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

Hi, wondering what is causing these load fluctuations late evening/early morning (or probably the whole day but clearer to see as closer to base load at those times). Assuming one of the fridges, but is this normal or indicative of a failing motor perhaps? 1 x chest freezer (brand new) 2 x fridge/freezer combos in kitchen (5 years old or newer) 1 x wine fridge (5 years old) 1 x very old bar fridge Thanks!

Thanks for everyone's comments/advice really appreciated! Still playing around a bit and getting used to different scenarios. Had a good test run last night/this morning - on batteries since about 7pm and went down all the way to 41% this morning including the 6-7am 4kW geyser run, then solar started to kick in and charged to about 50% already (and overcast atm). I should be able to manage LS in that period as well, as long as I can manage the beasts (geysers/pool pump etc). Thanks again 🙏😎👍

Good point txs, I'm going to lower the 9am %.

Getting the hang of it...slowly 😀 Quick question re battery management/health. Batteries set to be charged from solar, after load. In practice this morning the following would happen: Load 400W, Solar 900W, 500W charged to battery Then say load increased to 1500W, Solar 900W, 600W pulled from battery Then load reduced to 500W, Solar 900W, 400W charged to battery In that time slot where PV/sun not producing decent power yet the battery alternates quite a few times between charging and discharging depending on load change. Assuming this is not great for the battery/cycles? Is there any setting to stop solar feeding the battery for a given time period? I would like for the solar panels to producer sufficient power to manage normal load before starting to charge the batteries (i.e. that 7-9ish morning slot). Thank you

Txs @wolfandy This setup is consuming me 🙃 I've rethought the approach a bit 1) use some battery in the morning to heat geyser 2) use some spare PV to heat geyser during day 3) limit battery usage for geyser in late afternoon Intention still to minimise Eskom usage, maximise battery usage and get PV to charge. Barring some exceptions (few cloudy days, 4h loadshedding etc) I think 30% SOC should cover me for 2h LS. Does setup look ok? If I understand correctly, the grid will only charge the batteries from 5pm-8m if SOC below 95%. Rest of day batteries will only be charged by solar. Thank you

Thanks I like that. Have Geyserwize installed, but prefer to manage of the Smart Life app.

Thank you for the comments, appreciate. Steep learning curve! I definitely want to minimise Eskom usage, but also keep in mind having enough SOC to deal with loadshedding. That makes sense now and I will change SOC limits during the evening to 30-40%. Also untick Grid, as I want PV to charge the batteries. Just to confirm, is there no way to prevent battery going to geyser? The biggest issue is the 5-7am slot, cold geyser with 4kW element. Per above I can prevent the geyser from using battery by setting SOC to 100%, but that means I'll have to use grid for everything else too (essential)? If I tick "limit to load" would that also disable the ability to send surplus solar to non-essential? Thanks again!

Help please with setup, I'm clueless! Solar panels connected today: Sunsynk 8kW, Panels 9kW, Batteries 2 x 5kW Sunsynk Oven and geyser is on non-essential. My understanding was that surplus solar can be pushed to non-essential, but geyser and oven will never use battery. 1) Tonight about 7pm the geyser went on and used battery (I thought this wouldn't be possible). Batteries quickly depleted to 80% and then stopped discharging all together and moved to grid. 2) I looked at system setup and everything is set to 80% SOC. Not understanding as what is the point then of 10kW batteries, I would assume ability to discharge to say 20%? PS at 5pm I tested the PV, manually switched on the geyser and the PV did feed the geyser. Some pics of setup on inverter and example of flow when I hit 80% SOC. After reading multiple threads here on the forum I understand the settings a bit better, but still mostly lost. Would appreciate some basic direction so I can fine tune from there. Appreciate any advice thanks!

Hi there, very new to solar. I'm probably missing something obvious but my question is how do you know what is the maximum availability of solar power at any given point in time. I did search, but couldn't find anything useful. Inverter: Sunsynk Hybrid App: Sunsynk Connect Die power flow diagram on the app shows solar power input roughly balanced to the load. I want to know how much extra is available e.g. if I want to power my non-essential geyser is there sufficient extra solar power available. Example: This afternoon, house load was 400W, powered by solar. 9kW solar panels, but very cloudy. I wanted to switch solar to non-essential geyser of 4KW (i.e. put geyser on to heat on solar) Is there anywhere in the app to see if the panels would generate sufficient solar to deliver to the geyser, before switching the geyser on? In other words the practical maximum power availability at that moment. TIA 🙏

Apologies, moved to correct sub-forum