Posted January 29, 20223 yr Hi Everyone Please could someone help. I have no idea why my system does this. Please see pic. I have 4x 300 watt solar panels. The MPPT is suppose to do 1000 watt but always on a clear day it will peak to 1000 watt in the morning then drop off to around 600 watt 25amp and just stay there the whole day. Many thanks
January 30, 20223 yr It might be temperature, or it might be switching to float stage. Is there a "CHG" or similar LED and does it go from flashing to solid when the PV power goes down to 600 W? If not, can you show a plot of battery voltage at the same as say PV power?
January 31, 20223 yr Hard to say, but I think the inverter thinks that the battery is full. The battery current has fallen to a low value, which I don't really understand. Is the battery in poor health perhaps? One collapsed cell? There is a spike in battery current for ~10 min, I assume that was a switch to bypass mode. Then all the PV power went to charge the battery, and it reached just over 27 V. It seems to be going to float stage at around 26 V, which is obviously way too early (I assume that you have a lead acid battery). It should charge to a little over 28.0 V, stay there for some time, then fall back to around 27 V (the float voltage). It looks like the premature float bug to me, possibly combined with a very low absorb/bulk voltage setting. What is this setting? On a Voltronic, it would be setting 26, "CV" voltage. Maybe just increasing the voltage for that setting will help a lot.
January 31, 20223 yr Author AGM Batteries (6fm100z-x) were bought brand new about a year ago and very rarely do they go below 40% charge. I have an external battery monitor as i know the inverter one is not accurate. That spike was a brief switch over to "utility"
February 1, 20223 yr Huh. So it's not even getting close to the float voltage. The only thing I can suggest is try a daily equalise at say 28.2 V (14.1 V per nominally 12 V module) for say 60 minutes. See if that has any effect. But since it doesn't get near the float voltage I don't have much hope. As a quick test, you could just check the "Real-time active battery equalisation enable" radio button. That should attempt to charge to 29.2 V immediately. Don't leave it too long on this, as you could eventually over-charge the battery.
February 1, 20223 yr Author I tried setting the equalisation schedule. When i tried doing "Real-time active battery equalisation enable" it gave me an error. See pics these spikes are when it switches to utility. Could it be solar fuses or are we leaning more towards hardware failure/software error?
February 2, 20223 yr 22 hours ago, AndrewCal said: When i tried doing "Real-time active battery equalisation enable" it gave me an error. Huh. Maybe your model doesn't have equalisation facilities. 22 hours ago, AndrewCal said: See pics these spikes are when it switches to utility. I notice that the PV power goes to zero every time. I don't think that's expected. I would suspect high PV voltage, but ~70 V should not bother even the smallest model, I would guess. (Checks an Axpert EX 3K-24: Oops! Absolute max 75 V. ) That could well be your problem: your inverter seems to be shutting down the solar charger, or at least limiting the power output, as the PV voltage approaches 75 V. Without checking, I'd assume that it would start limiting PV power at some 65 V, ramping the maximum power down to zero at 75 V. What are the solar charging specs for this inverter-charger? How are your panels wired?
February 2, 20223 yr Author Panels are in series and parallel. Do you think i should do them all in parallel to keep the voltage down?
February 2, 20223 yr Author https://www.canadiansolar.com/wp-content/uploads/2020/05/Canadian_Solar-Datasheet-KuPower_CS3K-P_EN.pdf
February 3, 20223 yr Author This is on a cloudy day. I only switched it over to solar setting around 12 because it was raining.
February 3, 20223 yr 21 hours ago, AndrewCal said: Do you think i should do them all in parallel to keep the voltage down? Oh. It says it can run MPPT from 30-80 V, and a max of 102 V. So that's a different model to the one I assumed. No, it seems that your PV voltage should be OK so far.
February 26, 20223 yr 3 hours ago, AndrewCal said: Any other ideas it could be? No, sorry. It's a clone; anything can happen. Inverter firmware is extremely complex. It's just so easy to make a mistake. Clone manufacturers typically don't devote much resources to firmware maintenance. Heck, even the original manufacturer doesn't seem to do much maintenance.
January 22, 20241 yr My 3kw Synapse inverter with 2.57kw hubble battery shuts down and when I reset it battery shows fully charged. What is the problem
January 23, 20241 yr On 2024/01/22 at 12:53 PM, ters enviro said: My 3kw Synapse inverter with 2.57kw hubble battery shuts down and when I reset it battery shows fully charged. What is the problem Does it display any error codes? I'm assuming that you don't have BMS comms between the battery and the inverter, and setting float voltages manually.
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