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Forum Index : Electronics : Mab1's wiseguy inverter build - transformer options
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KeepIS Guru  Joined: 13/10/2014 Location: AustraliaPosts: 1872 |
No, I think the IDE version of AvrDude and more importantly the Configuration file has been modified to run with how Arduino IDE wants the bits set. The information from the later versions is superior in every way. I believe the IDE settings for the configuration file could stopping you from setting some of the Lock Bits. Notice the absence of other fuse access reads apart from what we requested it to do. Reading | ################################################## | 100% 0.00 s avrdude: device signature = 0x1e950f (probably m328p) avrdude: processing -U lock:w:0xFF:m avrdude: reading input file 0xFF for lock with 1 byte in 1 section within [0, 0] avrdude: writing 1 byte lock ... Writing | ################################################## | 100% 0.00 s avrdude: 1 byte of lock written avrdude: verifying lock memory against 0xFF avrdude: reading on-chip lock data ... Reading | ################################################## | 100% 0.00 s avrdude: verifying ... avrdude: 1 byte of lock verified avrdude done. Thank you. The above is straight from the command line batch. I think we can modify the paths to the later version of Avrdude and its config to solve this . Edited 2025-04-29 10:05 by KeepIS NANO Inverter: Full download - Only Hex Ver 8.1Ks |
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| KeepIS Guru Joined: 13/10/2014 Location: AustraliaPosts: 1872 |
Here is the Full output from the two fuse commands. D:\A_Varoius Backup Folders\__NANO\Avrdudess Loader>avrdude -c usbasp-clone -p m328p -P usb -b 57600 -F -v -v -U lfuse:w:0xFF:m -U hfuse:w:0xD7:m -U efuse:w:0xFD:m avrdude: Version 7.3 Copyright the AVRDUDE authors; see https://github.com/avrdudes/avrdude/blob/main/AUTHORS System wide configuration file is D:\A_Varoius Backup Folders\__NANO\Avrdudess Loader\avrdude.conf Using port : usb Using programmer : usbasp-clone Setting baud rate : 57600 avrdude: seen device from vendor >www.fischl.de< avrdude: seen product >USBasp< AVR Part : ATmega328P Programming modes : ISP, HVPP, debugWIRE, SPM Memory Size Pg size --------------------------- eeprom 1024 4 flash 32768 128 efuse 1 1 hfuse 1 1 lfuse 1 1 lock 1 1 signature 3 1 calibration 1 1 io 224 1 sram 2048 1 Variants Package F max T range V range ---------------------------------------------------------------- ATmega328P N/A 20 MHz [-40 C, N/A] [1.8 V, 5.5 V] ATmega328P-15MZ MLF32 20 MHz [-40 C, 85 C] [1.8 V, 5.5 V] ATmega328P-AN TQFP32 20 MHz [-40 C, 105 C] [1.8 V, 5.5 V] ATmega328P-ANR TQFP32 20 MHz [-40 C, 105 C] [1.8 V, 5.5 V] ATmega328P-AU TQFP32 20 MHz [-40 C, 85 C] [1.8 V, 5.5 V] ATmega328P-AUR TQFP32 20 MHz [-40 C, 85 C] [1.8 V, 5.5 V] ATmega328P-MMH MLF28 20 MHz [-40 C, 85 C] [1.8 V, 5.5 V] ATmega328P-MMHR MLF28 20 MHz [-40 C, 85 C] [1.8 V, 5.5 V] ATmega328P-MN QFN32 20 MHz [-40 C, 105 C] [1.8 V, 5.5 V] ATmega328P-MNR MLF32 20 MHz [-40 C, 105 C] [1.8 V, 5.5 V] ATmega328P-MU MLF32 20 MHz [-40 C, 85 C] [1.8 V, 5.5 V] ATmega328P-MUR MLF32 20 MHz [-40 C, 85 C] [1.8 V, 5.5 V] ATmega328P-PN PDIP28 20 MHz [-40 C, 105 C] [1.8 V, 5.5 V] ATmega328P-PU PDIP28 20 MHz [-40 C, 85 C] [1.8 V, 5.5 V] Programmer Type : usbasp Description : Any usbasp clone with correct VID/PID avrdude: auto set sck period (because given equals null) avrdude usbasp_spi_set_sck_period() error: cannot set sck period; please check for usbasp firmware update avrdude: AVR device initialized and ready to accept instructions Reading | ################################################## | 100% 0.01 s avrdude: device signature = 0x1e950f (probably m328p) avrdude: processing -U lfuse:w:0xFF:m avrdude: reading input file 0xFF for lfuse with 1 byte in 1 section within [0, 0] avrdude: writing 1 byte lfuse ... Writing | ################################################## | 100% 0.00 s avrdude: 1 byte of lfuse written avrdude: verifying lfuse memory against 0xFF avrdude: reading on-chip lfuse data ... Reading | ################################################## | 100% 0.00 s avrdude: verifying ... avrdude: 1 byte of lfuse verified avrdude: processing -U hfuse:w:0xD7:m avrdude: reading input file 0xD7 for hfuse with 1 byte in 1 section within [0, 0] avrdude: writing 1 byte hfuse ... Writing | ################################################## | 100% 0.00 s avrdude: 1 byte of hfuse written avrdude: verifying hfuse memory against 0xD7 avrdude: reading on-chip hfuse data ... Reading | ################################################## | 100% 0.00 s avrdude: verifying ... avrdude: 1 byte of hfuse verified avrdude: processing -U efuse:w:0xFD:m avrdude: reading input file 0xFD for efuse with 1 byte in 1 section within [0, 0] avrdude: writing 1 byte efuse ... Writing | ################################################## | 100% 0.00 s avrdude: 1 byte of efuse written avrdude: verifying efuse memory against 0xFD avrdude: reading on-chip efuse data ... Reading | ################################################## | 100% 0.00 s avrdude: verifying ... avrdude: 1 byte of efuse verified avrdude done. Thank you. D:\A_Varoius Backup Folders\__NANO\Avrdudess Loader>avrdude -c usbasp-clone -p m328p -P usb -b 57600 -F -v -v -U lock:w:0xFF:m avrdude: Version 7.3 Copyright the AVRDUDE authors; see https://github.com/avrdudes/avrdude/blob/main/AUTHORS System wide configuration file is D:\A_Varoius Backup Folders\__NANO\Avrdudess Loader\avrdude.conf Using port : usb Using programmer : usbasp-clone Setting baud rate : 57600 avrdude: seen device from vendor >www.fischl.de< avrdude: seen product >USBasp< AVR Part : ATmega328P Programming modes : ISP, HVPP, debugWIRE, SPM Memory Size Pg size --------------------------- eeprom 1024 4 flash 32768 128 efuse 1 1 hfuse 1 1 lfuse 1 1 lock 1 1 signature 3 1 calibration 1 1 io 224 1 sram 2048 1 Variants Package F max T range V range ---------------------------------------------------------------- ATmega328P N/A 20 MHz [-40 C, N/A] [1.8 V, 5.5 V] ATmega328P-15MZ MLF32 20 MHz [-40 C, 85 C] [1.8 V, 5.5 V] ATmega328P-AN TQFP32 20 MHz [-40 C, 105 C] [1.8 V, 5.5 V] ATmega328P-ANR TQFP32 20 MHz [-40 C, 105 C] [1.8 V, 5.5 V] ATmega328P-AU TQFP32 20 MHz [-40 C, 85 C] [1.8 V, 5.5 V] ATmega328P-AUR TQFP32 20 MHz [-40 C, 85 C] [1.8 V, 5.5 V] ATmega328P-MMH MLF28 20 MHz [-40 C, 85 C] [1.8 V, 5.5 V] ATmega328P-MMHR MLF28 20 MHz [-40 C, 85 C] [1.8 V, 5.5 V] ATmega328P-MN QFN32 20 MHz [-40 C, 105 C] [1.8 V, 5.5 V] ATmega328P-MNR MLF32 20 MHz [-40 C, 105 C] [1.8 V, 5.5 V] ATmega328P-MU MLF32 20 MHz [-40 C, 85 C] [1.8 V, 5.5 V] ATmega328P-MUR MLF32 20 MHz [-40 C, 85 C] [1.8 V, 5.5 V] ATmega328P-PN PDIP28 20 MHz [-40 C, 105 C] [1.8 V, 5.5 V] ATmega328P-PU PDIP28 20 MHz [-40 C, 85 C] [1.8 V, 5.5 V] Programmer Type : usbasp Description : Any usbasp clone with correct VID/PID avrdude: auto set sck period (because given equals null) avrdude usbasp_spi_set_sck_period() error: cannot set sck period; please check for usbasp firmware update avrdude: AVR device initialized and ready to accept instructions Reading | ################################################## | 100% 0.00 s avrdude: device signature = 0x1e950f (probably m328p) avrdude: processing -U lock:w:0xFF:m avrdude: reading input file 0xFF for lock with 1 byte in 1 section within [0, 0] avrdude: writing 1 byte lock ... Writing | ################################################## | 100% 0.00 s avrdude: 1 byte of lock written avrdude: verifying lock memory against 0xFF avrdude: reading on-chip lock data ... Reading | ################################################## | 100% 0.00 s avrdude: verifying ... avrdude: 1 byte of lock verified avrdude done. Thank you. NANO Inverter: Full download - Only Hex Ver 8.1Ks |
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| mab1 Senior Member  Joined: 10/02/2015 Location: United KingdomPosts: 242 |
Hmm... i'm not so sure changing paths will work: The paths (to avrdude and avrdude.conf) that work on the imac are via the arduino.app . when i try setting the path to avrdude.exe in your unzipped directory, it won't run the .exe files. that's what i was trying previously. Unless i run them via 'mono'? Sorry - off to bed again - will have a think for tomorrow. |
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| KeepIS Guru Joined: 13/10/2014 Location: AustraliaPosts: 1872 |
 NANO Inverter: Full download - Only Hex Ver 8.1Ks |
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| KeepIS Guru Joined: 13/10/2014 Location: AustraliaPosts: 1872 |
Looks like the IDE config is setting Fuse Safe Mode. That means it will read the Fuses on entry, which your setup is doing, and reset any Fuse that change on Exit, once again seems to be doing that. I've tested a few ideas and the best way to do this is to erase the Chip. So don't wast time on trying anything else. Once you erase the chip, the Lock bits are cleared. These do not need to be programmed again. ERASE: -c usbasp-clone -p m328pb -P usb -b 57600 -F -v -v -U -e Then upload the Hex File again and it should be fine.  . Edited 2025-04-29 16:50 by KeepIS NANO Inverter: Full download - Only Hex Ver 8.1Ks |
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| mab1 Senior Member Joined: 10/02/2015 Location: United KingdomPosts: 242 |
Progress 1st: I traced the problem on the WG30 power board (fault no output from one of the 12v isolated power supplies). I'm a bit embarrassed about it though.  Doh!  I must be getting old.2nd: I found a version of zadig ( V2.2XP) which runs under xp (the version 2.7 included the win32 driver, but zadig2.7 won't run on win32  . Once I'd run that and set the right driver, avrdudess2.17 could see the usbasp  So I plugged in the 2nd nano we've been trying to set the fuses on in terminal on the imac. Read the fuses and clicked the bit selector:-  So it looks like your imac command lines worked after all  and it was already right.I plugged in the 1st nano with just the hex file, that I didn't try setting the fuses on - and it's bitselector map was correct too Just as a sanity check, I plugged in a fresh nano - straight out of its wrapper. Checked the bit selector, and the lockbits were set 0xCF Tried to set them using avrdudess and got the same error I was getting on the imac yesterday:  Tried it a couple of times but the error seemed to repeat. So set the tick boxes to set lock when programming and uploaded the hex file. That seemed to set the lockbits : But I don't know how the lockbits got cleared on the original nano - unless uploading the hex file on the imac erased them anyway? No matter though - it looks like I can (finally) use either avrdudess on winxp or command line on the imac |
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| KeepIS Guru Joined: 13/10/2014 Location: AustraliaPosts: 1872 |
Great to find such an easy fix on the Power Board, although I bet you were secretly happy to find that pin floating  Yes that is common problem with programming the Lock bits, when you upload the HEX with standard settings, the Flash is Erased first. So, to erase the flash, the Lock bits are set to FF, after the upload, unless some other command is sneaked in, they remain off. I found earlier versions AdrDudess do not return/display the Lock and general status bits correctly. Normally you press each READ button twice (to be sure) and then press Bit Selector to display the results, but sometimes it's still incorrect The Important Fuse Bit is EESAVE, it must be 0, this preserves your Settings when you upload a new Hex file. NANO Inverter: Full download - Only Hex Ver 8.1Ks |
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| mab1 Senior Member Joined: 10/02/2015 Location: United KingdomPosts: 242 |
  I'm going to have to get back to winding the transformer I guess |
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| KeepIS Guru Joined: 13/10/2014 Location: AustraliaPosts: 1872 |
It's always a great feeling when all the effort and time we put in to assembling the Power boards and Controller produce what you hoped for Yes, the dreaded Toriod - The hardest part of my Toroid winding is finding three Very early Solar Inverters for the Toriods, no winding except for 14 turns of 2G cable through 3 stacked Toroids, which takes all of 10 minutes to wind  At least now you have the incentive to wind one NANO Inverter: Full download - Only Hex Ver 8.1Ks |
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| mab1 Senior Member Joined: 10/02/2015 Location: United KingdomPosts: 242 |
Slow progress: it isn't just winding the transformer though - the process of taking the inverter off the workbench and building it into some sort of enclosure, thinking about ground planes (been reading about other folks noise/interference suppression work) all takes time. I've decided to build the inverter into the aerosharp box ( the transformer won't fit, but everything up to and including the chokes will: the chokes and kilovac relay are under the ally plate).  I've wound a primary on the aerosharp 3kva 250/230v transformer to get up and running. 400mA idle at 42v in with 230v out of the 250v winding. Also, I'm transitioning from 24v to 48v with this inverter, so I need to build a 48v battery (done ) and start converting/ transitioning all the solar mppt (one poida mppt ready ) and diversion controllers over to the new system, all whilst keeping the existing system functioning until I've reassured myself that the new setup is robust.The plan is to start with the new inverter / battery and one solar array, and start testing with various loads, then transitioning more and more sources / loads over to the 48v system. |
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| KeepIS Guru Joined: 13/10/2014 Location: AustraliaPosts: 1872 |
Moving and working on a big inverter can be a real problem, imagine lifting 6 hefty Toroids in a complete inverter  , a visitor asked me the other day "why is my inverter so big?" my response was, why would you want to make it smaller, it has a comparatively small footprint, it's just tall, and it can be disconnected, wheeled around and fixed in under 10 minutes should a power board or controller fail for any reason.IMHO it would only be a component quality failure that would cause a fault in this inverter. Your build idea looks good, keeping plenty of room to repair and/or modify is the best way to go IMHO, and good move going to a Nominal 48V system, I went through converting from an 24V system to 48V a few years ago, I went about the conversion exactly as you are planing to do with both systems running until it was tested under loads for a week or so . Edited 2025-07-05 10:53 by KeepIS NANO Inverter: Full download - Only Hex Ver 8.1Ks |
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| mab1 Senior Member Joined: 10/02/2015 Location: United KingdomPosts: 242 |
Thanks Mike I do have a question regarding connecting big inverters to big batteries: The battery I've built uses a JKbms with active balancing and 200A continuous rating and is about 13kWh nominal capacity, and I've got another 17kWh battery yet to be assembled (a UK supplier (Fogstar) of 315Ah grade B lifepo cells suddenly dropped their price from £69.99 to £39.99, and I couldn't resist ).I know some people don't use a bms, but just a big DC fuse or circuit breaker, and an active balancer, and presumably relying on inverter/charger settings for min/max voltage. If you are dealing with peak currents (up to 1200A in keepis' case iirc!!  ) would you be happy with passing that through a 200A bms? Or would you put a big fuse/breaker between battery and inverter? |
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| KeepIS Guru Joined: 13/10/2014 Location: AustraliaPosts: 1872 |
The BMS will usually allow a short duration high current surge above the maximum current setting (see specs), however with high surge currents of around 800A DC, you really need parallel battery banks for a number of reasons. As far as I'm concerned, my main reason for using a BMS is for monitoring each cell voltage and to disconnect if "ANY Cell" is over or under voltage and to monitor/control charge current. The BMS I use are 200A and 250A rated and I have 4 banks of LiFePO4, 800A is where I set my Inverter to trip, but 1000A is still no problem for the 4 bank BMS. I don't trust FET switching in a BMS, so I also include a big 80A fuse on each bank, typically these fuses easily hold over 300A each for a few seconds or more. This also helps protects the Solar charge input, wiring and parallel banks from each other and is my last line of defense if all else goes pear shaped I also use separate 5A balancer on each BMS/Bank, as usual these also monitor each cell voltage (more wiring), I'm planing on building a bigger balancer and using that alone to protect each battery with a high current power saving sealed high current high voltage solenoid. Reason - I worry about supply chain problem in the future and want something I can use when a BMS eventually fails. That would mean I can build or repair the entire DC -> AC conversion electronics. No mater what others use, they must absolutely monitor each and every cell in a battery bank. _ Edited 2025-07-07 09:25 by KeepIS NANO Inverter: Full download - Only Hex Ver 8.1Ks |
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| mab1 Senior Member Joined: 10/02/2015 Location: United KingdomPosts: 242 |
Cheers; I guess my spur of the moment decision to buy a 2nd battery gives me extra peak current headroom as well as extra capacity . I prefer to have a bms for the same reasons, but I guess I was worrying about if the bms interprets the surge as a short circuit and disconnects. I don't expect to see start currents like yours, so two 200A bms's then should suffice, with additional tomzin dc breakers or fuses (have some forklift fuses, 80a and 200a, but suspect they're designed for lead acid short circuit current not lithium). |
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| KeepIS Guru Joined: 13/10/2014 Location: AustraliaPosts: 1872 |
The second battery was definitely good idea Those fuses will be the same for either battery type, large 80A fuses (usually slow blow) seem like a low value but are needed and work well in this situation, just check the voltage rating for the fuse and holder is around 48Vdc and not 12V. Most people don't realize that just three small (SMPS) power blocks, two for the dual LCD screens and one for my very small NUC computer will pull over 300A peak DC input for 8 out 10 times on power up with a lightly loaded Inverter AC output < 800W. It may be a short transient but the FETs still have to switch that current and more. From memory Poida found his single Mac-book supply did that. _ Edited 2025-07-07 11:18 by KeepIS NANO Inverter: Full download - Only Hex Ver 8.1Ks |
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