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Thank you for the great forum, Safe Driving over the weekend. Sincerely Jason

VaughanT

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  1. 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
  2. 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
  3. 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
  4. 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
  5. 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...
  6. 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
  7. 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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