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Jaco P Bloem

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  1. *or rather, the 54V sounds like settings for a 16S LiFe, we will have to find more information on your battery.
  2. Hi Do you perhaps have more information on the battery? If it is a 15 cell Life battery, the charge Voltage might be too high. I can propose the following : Bulk Charge : 52.5V Float : 51.8V Also setting 12 should be 48V then the battery will not drain completely (if this is your 'point back to Utility' setting? Setting 13 to 51 V (back to battery) If you can give this a try? It may be that the battery BMS protects itself from the high voltage (as 54V sounds more like flooded battery settings). Let us know Kind Regards Jaco P
  3. Hi Jaques A single 6mm sq cable (pair) is sufficient for the 2 strings in parallel as the source is 2 x 9.7A, so less than 20Amp. Even a 4mm is enough but yes the losses are less in the larger diameter and the given distance. In my installation I've connected the parallel strings on the roof without fuses using a connector box (self made, but I see you do get the MC4 type PV parallel connectors). It then passes through a single fuse and 30Amp Isolator switch before it goes into the Inverter. The 32amp fuse is sufficient, as stated the current will be below 20amp and less. (I do run 2 Inve
  4. Thank-you, I was wondering yes! The update to 71.82 went well - all seem normal and stable this morning.. Although now it is snowing (possibly just 'ice rain') in the Free State - go figure! But the PV is doing well, still charging (slower) and supply load through the clouds - no experience with other panels but the Canadian Solar performs well during overcast conditions. Will monitor.. I agree with the ICC issue, I monitor my batteries manually now and use WatchPower, at least to identify faults.. Kind Regards!
  5. "Wat jy meet is wat jy weet "! Thanks @pierre. I will keep an eye on your posts. Would love to get a Pi in future and learn - the complete 'plug & play' set with ICC is now above R3000 and I am not sure if that is worth it.. I am going to Flash my 2 inverters tonight or tomorrow with the 71.82 version. (I am still on the Old 71.50!) Since I took measurements it turns out I am suffering from the premature float issue. I am using 52.5V Charge and 51.5V Float values (15s LiFeP) - thanks @plonkster I have learned a great deal from your posts and the 'correct but low as possible' sett
  6. Hi @Pierre and all After measurements using WatchPower ("no cloud, poor sample rate - put laptop in 'no sleep mode' and export to Excel" method).. the output Voltages on my 2 parallel Axperts inverters do seem to be stable at around a 1% fluctuation, for this day at least. The batteries were below 47V (setting 12, to give app. 20% left on the LiFe's) just after 6am so the inverter switched to line (grid) mode. The rest of the day consisted out of battery charging (20Amps x 2), app 1kW from each array.. back to battery mode just before 9am..and normal home loads (washing day)..
  7. ..one thing I do not have is good monitoring software! Are you using ICC on the Raspberry Pi? My first installation (2019) is 12 x 330W Canadian Solars, the array is two parallel strings of 6 in serie each. I have now added the second inverter with 8 x 360W Panel array all in serie to the second inverter - running in parallel with the first Axpert. Hats of to the mppt chargers referencing different input voltages (223V DC on the one and 317V on the other), and still maintaining equal power drawn. When the load exceeds the capability of one of the PV arrays, then only will the fi
  8. Thanks @Coulomb! Pierre, just to make sure, do you have 2 PV sets consisting out of 9x 360W Panels in Serie - 1 set per Inverter?
  9. Hi Pierre Are these the SOL-I-AX-5NB Axpert MKS II models with 450Vdc capability? What would you say is the most noticeable changes / advantages to upgrade? (I have two in parallel on version U1-71-50) Regards Jaco P
  10. Thanks @Coulomb, yes the Charge Capacity is given as 80Amp and Rated PV at 4500W. Voltronic qouted the 20% so my supplier wrote 5400W which made my eyebrows lift as well- I will rather agree with your Calc. Fortunately @JannieM should still be OK with 16 panels (300W) in the second array giving 4800W. I think the point they are making is that the current drawn from the PV source will be limited to produce 4500W.
  11. Hi Erwin I do not have knowledge of the Growatt inverters, but have two Mecer Axperts in parallel. You are correct in that all similar AC in/out puts and Battery DC are parallel connected on the two inverters, except the PV inputs. You may not bridge the PV inputs as then you effectively parallel the 2 DC input sources (that you have designed with care in your drawing ) and short-circuiting the two mppt chargers. I am sure it will be similar with the Growatt: on the Axperts you connect a ton of communication and current sharing cables (a parallel communication kit) .. in order
  12. Hi Jannie I have a similar setup, with the same 2 Axperts in parallel but only 20 panels (12 x 330W on the one and 8 x 360W on the other). You can install your first set (array) as 7s+7s to the one inverter and the second set as 8s+8s to the second inverter. Then all 30 panels are utilised. {This is, you parallel two series strings of 7 panels in set 1} The 2 sets do not have to be identical as they each go to their own MPPT charger, as long as the parallel strings are equal and you stay below the 450V. The operating Voltage is lower than the stated Voc (Open Circuit V), so
  13. Hi As the AC input and output and even the battery DC side is bridged out in the parallel config, my opinion is that the issue is in one of the PV input sets. If I recall correctly, you have posted 98V and 114V of the 2 PV inputs. If the 270W panels operate at around 30V, the 114 seem OK (depending on the time of day). The 98 V set is suspect, how does the 'open circuit' voltages test? You can perhaps measure the sets and strings and panels, the should give similar readings each time. Hopefully just a connection issue in one string.. ((Just measure and check connections safely - it can
  14. Hi Jay You seem to be OK, I also do not have a mechanical bypass, with all the in and out going breakers one can safely disconnect the inverter - but we will have to do some wiring in case of a permanent issue.. You should consider adding surge protection on the PV (on or close to the Inverter). There is discussions in this forum on PV DC fuses - but each string should ideally have a fuse just above the max current source. So if 1 string has 2 in serie that source is app. 2 x 9amp so a 20Amp fuse is OK. (My Axpert can handle 450 V DC, so I have 8 panels in serie - the sourc
  15. got it! I do have a heat pump installed but will supplement it during the winter daytime with the 2kW element. I will install a normal DB timer switch to prevent it also from draining they batteries. (I have tested this and if you gets the temp high enough it will last until the PV take over again) I am sure you do get automatic time based change-over switches if you want. But while you will take energy from the grid for the Geyser in any case, you may as well drain your batteries to the point that your home load would have, then let the Inverter switch all load to the grid and wai
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