There are only half a dozen commands that the main processor sends to the SCC, and none of them affect the minimum PV voltage, at least not directly.mirceaalex001 wrote: ↑Thu, 24 May 2018, 04:35is there any way to change the min.solar voltage from 40 vdc to 55 vdc?
What do you mean by the min solar voltage? What makes you think it can go down to 40 volts? My understanding is that the minimum voltage on the solar inputs that the PIP's SCC can maximum-power-point-track, is about 1.5 volts above whatever the battery voltage happens to be at the time.mirceaalex001 wrote: ↑Thu, 24 May 2018, 04:35Hello again guys, is there any way to change the min.solar voltage from 40 vdc to 55 vdc?
This may be a way to fix my problem , since the voltage that keeps the scc on in the night is like only two volts plus the batteries , with a 55vdc setting , it may cut the scc.. But if is something too hard , i will try another fix . Thank you !coulomb wrote: ↑Thu, 24 May 2018, 09:08There are only half a dozen commands that the main processor sends to the SCC, and none of them affect the minimum PV voltage, at least not directly.mirceaalex001 wrote: ↑Thu, 24 May 2018, 04:35is there any way to change the min.solar voltage from 40 vdc to 55 vdc?
So you'd have to patch the SCC code. Possible, but a lot of work. Why do you want this?
My problem is that at night , the scc stays on , because somehow i get voltage on the scc coils ( driver 1 , driver 2 ) And i need a setting that will cut scc at higher voltage ( i have like 2volts + the battery voltage all the time on the pv input ,when the scc relay is connected ).If i change charging settings at night , and the relay disengage , evreything is ok untill next morning (The pv input voltage disapear )weber wrote: ↑Thu, 24 May 2018, 10:20What do you mean by the min solar voltage? What makes you think it can go down to 40 volts? My understanding is that the minimum voltage on the solar inputs that the PIP's SCC can maximum-power-point-track, is about 1.5 volts above whatever the battery voltage happens to be at the time.mirceaalex001 wrote: ↑Thu, 24 May 2018, 04:35Hello again guys, is there any way to change the min.solar voltage from 40 vdc to 55 vdc?
I don`t have any fault code , every thing seems to work as it should , except i got voltage on the pv input from batteries , when the relay is on .Revlac wrote: ↑Thu, 24 May 2018, 18:01I don't think changing the minimum solar voltage (if possible) would make any difference to the situation.
I still think there may be a setting's conflict that tells the the relay drivers to stay on. (expecting soler power to still be available)
That is the situation I had, I also had an fault code on the screen.
Hows the testing of this beta firmware going? Any issues? Good for release?weber wrote: ↑Mon, 07 May 2018, 18:29Beta Version of Patched Firmware 73.00c
This is the third version of our patched firmware based on factory firmware version 73.00. This patched firmware has all the same patches as 73.00b and earlier patched firmwares, including Dynamic Current Control and AussieView™. This includes fixing the infamous premature float bugs.
In addition, 73.00c makes the following improvements/bug fixes:
1. We fixed the bug where, after changing a setting once, you could not change it again without first pressing the up and down buttons. We also fixed the bug where, while changing a setting, you could not go more than 135 steps up or 120 steps down. This affected the Absorb time setting [32]. These were pointed out by user OomD on the South African Power Forum.
2. In versions 72.70c and 73.00a/b we attempted unsuccessfully to improve the accuracy of low current readings by the simple expedient of subtracting 1 amp to account for losses. But forum-contributor @sinux, pointed out that the losses during AC Charging are much less than 1 amp and so we had in fact made AC charge current readings less accurate.
In this version (73.00c) we have improved the accuracy of all charge and discharge current readings, by using more complicated formulae. A detailed description can be found near the end of the Dynamic Current Control manual, as linked above. These changes do not affect the relationship between requested currents and actual currents, only between actual currents and displayed or reported currents.
Note: This firmware is only suitable for the 48 V models with a single low-voltage MPPT and a power factor of 0.8 (4 kW / 5 kVA), not those with dual or triple MPPTs or a power factor of 1.0 (5 kW / 5 kVA), and not those with a maximum PV array open circuit voltage greater than 145 V DC.
For lithium ferrous phosphate (LFP) (16S or 15S)
dsp_BF1_73.00c.zip
For lead acid (24S), lithium cobalt-blends (LCO, NMC, NCM, NCA) (14S), and lithium titanate (LTO) (21S)
dsp_BC1_73.00c.zip
For reflashing instructions see the 72.70b reflashing instructions, but ignore the zip files there.
No issues. It's good to go. We just need to get around to updating the version number to indicate release instead of beta.
Coulomb just brought this to my attention:
That does seem to be the most likely explanation.
Charging while a master takes a different path through the code compared to charging as a slave, so this is entirely possible, if the battery was nearing full. I assume you realise that when bulk or absorb charging, the LED flashes on and off with a period of about a second. Only in the float stage does the charge LED stay on solid.2 weeks ago I connected another 3kw of panels ... is the charge light would illuminate the[n] switch off, then back on etc.
This will waste about half the panels on good solar days, since each inverter's SCC is only capable of delivering some 3 kW. Leave them split as they are now.I assume connecting all 6kw to the master will fix this
Tested out today, still not showing a reading with either selected.
While watching today and all seemed ok until the end of daylight, which is when I would have noticed the problem before. The slave was charging at 5 amps (float stage) and the master was switching on/off charging. The PV input for the master was around 100w, where as the slave was 350w.Charging while a master takes a different path through the code compared to charging as a slave, so this is entirely possible, if the battery was nearing full. I assume you realise that when bulk or absorb charging, the LED flashes on and off with a period of about a second. Only in the float stage does the charge LED stay on solid.2 weeks ago I connected another 3kw of panels ... is the charge light would illuminate the[n] switch off, then back on etc.
This will waste about half the panels on good solar days, since each inverter's SCC is only capable of delivering some 3 kW. Leave them split as they are now.I assume connecting all 6kw to the master will fix this
Thanks, but I don't think it's firmware related. Lets watch that topic and take it from there.weber wrote: ↑Fri, 25 May 2018, 21:34Coulomb just brought this to my attention:
Ebrsa on the South Africa Power Forum: http://powerforum.co.za/topic/1997-axpe ... -on-delay/
It may have nothing to do with the beta 73.00c firmware. But it's only fair to let you know. And so we'll be keeping it beta for a while yet.
From the voltage range in the datasheet of 46-54V, I would say that this battery is 15 cells in series, can you ask the supplier to confirm this? It this case a float voltage of 52V is too high. I would try a CV/bulk voltage of 51.8V (3.45v/cell) and float voltage of 50.2V (3.35V/cell). You might have to set the CV/bulk voltage higher to get the balancing circuitry working.frisca wrote: ↑Tue, 29 May 2018, 19:57
Regardless of the volatege that I set the invertor to stop charging at, the BMS of the battery kicks in and stops the charge displaying a "cell over max voltage" error. After reading on this forum all the info I was able to assimilate, I now believe that the problem is related to the "float" part of the charging process and to the fact that the inverter is not really stopping the voltage at the set level. Right now, the fload is set to 52V, down from the 52.7V that came as default after I updated the firmare.
Many thanks! I wrote them for information and will try to set your recommended voltages. Nice and sunny in Europe right now and I should have an answer within hours. Will write back with an update in case others encounter the same issue.simat wrote: ↑Tue, 29 May 2018, 23:48
From the voltage range in the datasheet of 46-54V, I would say that this battery is 15 cells in series, can you ask the supplier to confirm this? It this case a float voltage of 52V is too high. I would try a CV/bulk voltage of 51.8V (3.45v/cell) and float voltage of 50.2V (3.35V/cell). You might have to set the CV/bulk voltage higher to get the balancing circuitry working.
Simon
Hopefully you live in the northern hemisphere, or your south facing panels will see a lot of shade
Yes. 230 V × √3 = 398 V.- in a 3 phase system its the voltage between 2 phases 400v ?
Yes, they all draw their power from the same battery, so it doesn't matter which machine charges the battery.- in case of one of the inverts doesn't have so much solar energy can take the extra energy from the other two t[h]rough battery ?
Ah. My understanding is that Tesla modules are 6S of a 3.75 V (nominal) chemistry. So two modules in series is 12S. The inverters and therefore our patched firmware works best with 16S or 15S LFP, 24S lead acid, or 14S of most lithium chemistries. So 12S is almost 15% short.
From the AussieView™ manual (accessible from the index in the first post of this topic):My problem is param 12, because I would like to set them to 41 but the minimum value is 44. With modified firmware can I set the 12 param to 41?
b2u [12] ... V Battery to utility voltage (lower threshold) (volts)
(when out = Sbu or SoL)
LC: 44 to 51 in steps of 1 (46 default)
LF: 46 to 53 in steps of 1 (48 default)
You'd be using the LC version, since it is the lower voltage version of the two versions of patched firmware. So you'd still be restricted to 44 V minimum. The LF version has 46 V minimum, an even worse fit for your application. Further thoughts on that. In battery mode, the "bus" voltage (which the inverter runs from) is about 8x the battery voltage (less some voltage drops), because the high frequency transformer seems to have a turns ratio of 1:8. To generate 230 VAC, you need of the order of 230 × √2 = 325 VDC, call it 335 VDC with IGBT and inductor voltage drops (absolute bare minimum, it may need more). Again ignoring losses, that means you'd need at least 335/8 = 42 VDC at the battery side full bridge. With various voltage drops in the MOSFETs, cables, PCB tracks etc, I'd guess that it's not practical to run the inverter at less than 44 VDC.