iops

Interesting, tested with the charge settings today using solar only (OSO) with a battery cut-off back to grid at 23.5V. It stopped using the batteries when it reached that voltage, but without charging from the grid or solar this evening the voltage went back up to 24.5V with the capacity being reported on the inverter at 82%. Any ideas?

Hope everyone's safe and healthy, here's another Axpert SOC thread. Sorry. I'm aware of the Victron BMV's, I'm trying to automate things myself with some calculations and test my batteries at the same time. I've spent most of today reading through various threads on the subject. I think as a last resort I'd want to avoid purchasing a BMV since my load is fairly consistent. After the first test I have some questions though, I'm starting to question the health of my batteries. I'm using the below estimate to calculate SOC: A little bit about my system: Axpert Synapse 3.0+ 24v inverter 8x Deltec BR-12V100 AGM batteries. Specs here. 6x 330W Enersol solar panels in 3S3P Settings changed below, everything else is stock. 01 SBU 02 30A 03 APL 05 AGM 11 20A 12 23.0V to test 13 27v 16 CSO I've had the system installed so going off the installers word, my knowledge is quite limited. With my 8x 12V batteries I have a total of 400aH. My test tonight was calculated as follows with some safeguards like deducting 50aH for inefficiencies: 24V * 350aH = 8400 Watts/hour 8400 / 800W avg load = 10.5 hours 10 hours / 2 = 5 hours to have a battery SOC @ 50% I reached 3 hours and had the Axpert report 23.1V, it beeped for a while and went into bypass mode. My average load over these 3 hours was 681W, peaked at 1131W for 3 minutes. Before I started the test the batteries were in float according to the battery charge LED on the Axpert. Within an hour the inverter reports DC voltage as 25.8V. I'm a little confused, loadshedding sessions have lasted longer before and having 400aH surely shouldn't last 3 hours? Should I change setting 29 to less than 21V? I've heard that this skews readings even further, or should I have my batteries checked? I have a Raspberry Pi setup that queries the inverter, I pipe that data into InfluxDB and visualise it in Grafana along with some scheduled tasks (via cron) to set the inverter to Utility of SBU based on my home automation. What I'm hoping to achieve is something like this: 5 hours before sunrise set the inverter to SBU along within a specific specific voltage for setting 12 and have the panels charge the batteries through the day when the sun rises 3 hours before sunset change setting 12 to a specific voltage, once reached set setting 1 to UTL If I had to buy the battery monitor, how does it interface with the inverter to not simply change back to grid/batteries based on voltage?

I have my 6 330W panels wired in 3S3P. My inverter doesn't report that the voltage for PV goes over 80V so I might be able to add more panels. Someone else probably needs to weigh in though, I'm a bit out of my depth here.

I can try giving it a shot, what does it look like?

I've asked the installer how they're installed, it is within the max limitation of my inverter of 1500W though. When PV is in use the inverter reports 70V at max. I'll get back to you on this though. Also just a heads up, I believe the Must is a clone of the Axpert. Good question, I believe the Synapse isn't a clone - perhaps someone more knowledable than my can confirm? I've had a read through another forum thread which shows you how to identify if it is a clone, I've done most of them apart from hooking up that dreadful WatchPower app. I've included a picture of the side labels below. The fans do run a lot. I think the only time it isn't running is when the batteries are in float and PV isn't being used. I had my panels installed mid-month last month and have noticed that the fans run a lot. It doesn't really bother me since the setup is in a room outside of the main house. The Synapse has been running as a loadshedding backup solution with batteries connected since December, I haven't had any issues... apart from posting here and wanting to upgrade to Victron gear

That's awesome to hear, cheers for your feedback! Can I ask how you're measuring SOC Cool, I think I'm getting there slowly but surely. I just need to figure out how to measure SOC on these batteries properly, a few posts in on this forum and I'm wanting to expand my whole systems I've read great things about the Victron BMV - I think I need the 702 to measure the midpoint since I have 4x 24V banks?

Thanks, this does make sense. Makes sense to not just leave them in float, this is what initially got me thinking about how long they'd last sitting there vs being used. I linked the spec sheet in my original post, DOD @ 50% seems to be on the lower scale of things at 600 cycles. Today there's been one cycle earlier this morning, probably two more tonight going down to 24.5V. I think that's roughly 60% DOD. If that really is a cycle am I relying on 3 cycles per day? That seems low considering I'd hit 600 cycles in under a year if I had to keep the settings as is. I'm a little confused.

Not even sure if this needs so much thought, but over the last few days I've been trying to get the best out of my system. I'm trying to decide whether it's worth using my batteries alongside my solar panels daily or instead extend the life of my batteries and just use them for load shedding and other power outages. A little bit about my system: Axpert Synapse 3.0+ 24v inverter 8x Deltec BR-12V100 AGM batteries. Specs here. 6x 330W Enersol solar panels I've also included my current inverter settings below. Averaging 495 kWh per month, paying R2.01 per kWh. This is my first full month on solar though. Load at night is ~500W with loads during the day averaging ~800W. My thinking to reserve my batteries for load shedding is to extend their life, giving me a better ROI. My (very limited) thinking about cycling daily is to save on some electricity and cycle the batteries in the evening, using the grid to charge at night. I've seen that the batteries are used some time to time if my power requirements exceed that of what the panels are currently producing. Any thoughts on this? Axpert settings that I'm currently using, if a setting isn't mentioned here it's using the default value. 01 SBU 02 30A 03 APL 05 AGM 11 20A 12 24.5V 13 27v 16 CSO

Looks awesome! Mind sharing the dashboard JSON?

Greetings! Long time lurker now, decided I'd finally register and join the fun. I've recently had my solar system installed, started off as a loadshedding backup with 4 batteries and an inverter, but the bug bit pretty hard. Added on 4 additional batteries to my 3kVa Synapse inverter along with 6x 300W panels. All super exciting, and really enjoying my setup so far. Had a small homelab setup for ages with Grafana and have started monitoring the inverter too. I've attached a screenshot of my Grafana dashboard for all things power. Also been toying with a scheduled task, switching between charger priorities. The Raspberry Pi that's currently monitoring the inverter runs a scheduled task in cron to switch to solar priority/utility priority based on sunrise and sunset. All pretty cool! I have two potentially silly questions that I can't seem to find the answers for, probably because I'm Googling the wrong terms. Hopefully you guys can answer: 1) If I run my batteries to say 60% capacity and they start charging (I've set the max charge to 30A from what I can remember) does this use any additional power from Eskom? 2) Running on battery power, the first 15 mins or so tend to drop quite quickly and then almost flatline. Is this normal? I'm using around 550W on average when switching to battery. I have read on the forums that the Axperts seem to measure voltage/capacity quite poorly. Great to be here, see you guys around!