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VaughanT

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  1. Greetings Coulomb - are there any resources of circuit schematics for this particular unit? I noted when I opened it up that one of the large black electrolytics was slightly bulged (i.e. the vent cap had bulged up.). This might be perfectly normal for this particular capacitor - however when I see this on an electrolytic I become suspicious of its performance. I have an extensive knowledge in electronics through I will confess switch mode PSUs are not a strong point of mine
  2. Thank you 87 for your input Much appreciated Vaughan
  3. Greetings to the brain trust - I have a question to ask pertaining to a particular unit that has been operating reliably for a number of years at my parents home. Of recent the output of the unit went intermittent (repeatedly goes on/off) with it in bypass mode. I have taken it out of service and handed it into Rectron at their service centre. They have subsequently reverted back indicating that they did some work on the unit main PCB and am unable to get the unit output to turn on. It also shows an error code '6' (have not seen this in the manual before). RCT is now wanting to replace the unit main PCB at a cost of R5000. Whilst the cost is roughly half the cost of a replacement unit - I am concerned that this cost is simply not economically feasible and wanted to see what options exist for its repair. Is this fault a common/recurring one that has been remedied before by other members on the forum? Are there repair outlets (other than RCT) in JHB who have had success with the repairs on these units? Should the unit simply be scrapped and replaced ? Either way both the repair and/or replacement cost is extremely high for my parents who are pensioners. I would be grateful to receive your valuable inputs on how best one could proceed with this matter. The present loadshedding is equally a massive problem for which there appears to be no end for it in sight. Vaughan
  4. Greetings Braintrust - I'd be curious to hear your comments on the Axpert Max (8kW version) - from a build perspective - to the smaller units, It is cut above the 3kVA and 5kVA units and seems to be a professional and neat solution. It is the first time that I've seen the Watchpower app in operation via the built-in Wifi module - does anyone know if the app can send out alerts/notifications (for example when utility AC fails and the unit operates on batteries - as well as any other alarm/functional issues). Any other comments (positive/negative) on the unit would be greatly valued! Vaughan
  5. Dear Braintrust - some time ago I installed the above-mentioned unit for my folks to help get them through load-shedding and power outages. For the most part the unit has been solid and has a bank of 105AH, deep-cycle Enertec batteries as the storage in the system. Ultimately I'd like to consider adding solar panels to the specific inverter along with upgrading the present battery bank to a technology that would allow it to be regularly cycled. From what I understand - this particular inverter has some limitations in terms of; 1) Maximum PV voltage (limiting the number of panels as could be applied) 2) Battery voltage settings as would be applicable to the higher voltage lithium cells. The PV market is rapidly evolving with emphasis being on panels that obviously operate on higher voltages which will further limit the choices of what panels could be used. I would be grateful to receive your responses on how best I could manage the situation at hand. Vaughan
  6. Folks - the following information was received (as below) re the Axpert Mkii. This is not captured anywhere in the product documentation (unless I missed it somewhere) Vaughan “We already inbuilt the function to bridge output N-G when the inverter is running in inverter mode. Due to this reason, we also removed the function of Program#38. You could check the inverter output voltage between N-G when the inverter is running in inverter mode. It should be at 0Vac.”
  7. It was a real handy feature - being able to at least monitor when the unit was online or in bypass mode. I’ve not powered up the unit I’ve purchased, so unable to comment on whether the safety relay actually switches both poles. I completely understand the point re the external relay for the bonding of neutral to earth. I’ve seen some ‘hairy’ installations in my time including the use of the earth PE conductor as neutral!
  8. Folks - have any of you noticed that on the Mk2 version the ability to use the dry contact output for driving a remote monitoring device for example is no longer available. Was there any reason as to why this was removed? It was previously as NEC ( #38) in the unit setup menu
  9. Greetings to all on the forum - at the point at which loadshedding became a 'necessary evil' in our lives last yeart, I created the basic infrastructure at my house to provide for the minimum requirement to power essential loads. I've installed an Axpert 3kVA (PF1) inverter along with two Enertec deep-cycle batteries (105AH). For the minimal investment, i am happy with the performance and reliability point. my view was also to use this as a basic introduction to renewable energy and obviously to consider what options do exist for optimising performance and future upgrades. I am aware that much has been written about the battery charging algorithm/s in the Axpert and at this juncture wanted to ascertain what would be the best settings on the unit for accommodating lead-acid batteries ? The Axpert provides three options AGM/Flooded/User options - I've noted that if you choose User - the unit does not allow you to activate the Battery Equalisation programme - these can only be done if the mode is selected to AGM/Flooded respectively. Under User - I've set the Bulk charge to 28.2V and the float charge to 27.5V. As the Axpert does not truly reflect the SOC of the batteries - I'm inclined to want to consider using an external device such as the BMV702 which can also be read via the ICC portal. I'm keen to receive your inputs and to further learn more on how best I can optimise what I have in service. Best regards Vaughan
  10. I've recently hacked a three-wire RS232-to-USB interface for my Texecom Alarm panel using the FTDI-RS232RL development board - this I understand is a Chinese clone and it seems to work ok. I've done a few firmware upgrades and it shouldnt be an issue - provided as you say I identify the correct version to upgrade the unit to. Best regards Vaughan
  11. Coulomb - thanks for your valued input. I don't think this unit is a PF1 model (the rating plate states the unit is 5kVA/4000W. If I multiply out the max current x DC voltage I get 4,464W - which I note doesn't equate to the maximum current of 22A as stated. This model also has the large heatsink right at the top (presumably where the FETs are mounted onto). I installed the unit for my folks - its in an cupboard (as this was the closest point I could get to the existing DB board). This does cause the unit temp to rise somewhat and I've further added in vent holes to improve air-circulation around the unit. I will likely have to get some 48VDC fans and build a small temp sensor circuit to control these automatically. Given the horrific state of SA's grid - these units are becoming increasingly popular. My PF1 3kVA unit runs the fans much harder - in fact these run much of the time even with the inverter lightly loaded. How do I determine the firmware version of the 5kVA unit? Is it a pain to upgrade the firmware? The 3kVA model I have also provides for a contact-closure output (to drive external relays, etc.) - the state of which can be determined via the sub-menu setup. The 5kVA doesn't provide a contact closure when the unit is running - does the firmware upgrade address this? Vaughan
  12. Folks - please could I pick some brains about the cooling fans inside the Axpert 5kVA (unit was purchased circa 2015/16) - and noted the two internal fans run constantly at slow speed (i.e. not dependent on load or on the unit temperature. I have the 3kVA model in which its fans run at two speeds (seem to be dependent on unit temperature and/or load). Would appreciate your comments. Vaughan
  13. At that high DC current - you want to ensure that every strand in that 50mm2 (or larger) multi-strand cable is accounted for and I'd only advocate crimping them. Years ago I made up some heavy duty jumper cables using welding cable. I didnt have the crimping press to put the lugs on with - so I used a heat-gun to heat up the 'ferrule' and soldered them on. The lugs in turn got bolted onto the jumper cable clips...I also recommend using bootlace ferrules on any multi-stranded conductor that is inserted into a terminal that uses a screw for making contact - particularly where high current is being spoken about (regardless whether its AC or DC)...those need to be crimped on using an appropriate press...
  14. Greetings - I''ve recently installed an Axpert 3kVA (PF=1) inverter as an off-grid backup power solution and have no issues with it. I noted that Voltronic updated the firmware to provide a dry contact closure (for example to pull-in an external relay for bonding the neutral earth together, or providing external telemetry signals (via menu 38). I've noted that on two units of the same vintage (3 and 5kVA capacity, circa 2015 ), this feature does not exist. Is it possible to do a firmware update to address this ? I need a means to drive an external indication that shows the inverter output is 'on' - One could provide a 230V relay monitoring the incoming AC supply - but I reason that the inverter is already providing this function internally. Inputs appreciated. Vaughan
  15. I'm a newbie to this forum but was keen to share the following - just installed an Axpert 3kVA to power up some essential loads (electric gate motor, fence intercom and emergency lighting for a large complex. The Control panel of the inverter is not visible to the user and so had to install the the remote control panel which has RJ45 connectors on it. The documentation is poor - but Voltronic supply a new interface comm board which replaces the USB port with an RJ45 - note it's not a network interface to the Internet- you still need to connect the RS232 via USB converter / runs ok with Win7 - can't comment on the other flavours- Vaughan
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