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Thank you Plonkster for your detailed answer. I found it interesting and very informative.

A distributor af Apert Inverters claim that their new Inverter of 5 kVA actually produce a neat 5000 Watts usable power on output to the appliances at a power factor of l.00. The previous or older models only produced 4000 W due to a power factor of 0.75 to 0.8 Is this at all possible ? It sound a bit strange to me, or is the new release Axperts that good ? I presume that the new release Inverters will be a 6 kVA machine producing a useable 5000w of power. We

Hi Don, which computer program are you using to record your data from the Inverter or is it a brand designed for a specific inverter make only ?

Will a grid- tie Inverter work properly to feed excess S.P. generated units accumulated during the day, back into the utility supply line ? These PAYG meters diplay the number of units to your credit digitally. Will it in fact add on the generated units to your displayed credit ?

Hi Coloumb for your sound advice. How exactly does the utility power pass through system work on the Axpert ? 1. Is it a straight through bypass of the inverter cutting the Inverter off. 2. Or is proportional battery current used as well. 3. If one uses the three stage switch ( Inverter, Off, Bypass ) in conjunction with the AC input and AC Output Isolaters, does that cut the Inverter out to ensure a straight through utility power for loads above 4000w. Thank you in anticipation.

Thank you pilotfish for your kind advice. I, have downloaded the Service Manual. From Google. Never the less, i would like to reach the 15 posts mark on this informative forum as you have suggested.

Thank you Plonckster i agree that replacing the 40TPS 12 A 's all will be the better option. Would the manual with the download files be found under the Axperts Service manual or the users manual..? Thank you.

Hi Colomb. Thankyou for your very informative reply some days ago. Trying to work out the Axperts architecture I've come to the conclusion that the machine basically consists out of three major modules, i.e., (1.) Main or mother board incorporating the actual inverter itself. ( 2.) MPPT Solar Charger. ( 3 ) AC mains Charger. On a further inspection I found that the Main boards left hand heatsink housing the ( switching ) transistors ( mosfets or thyristors ?)rated 40TPS 12 A rated at 55A 1200V to 247 AC.) 5 of the 9 blew up during the gunshot blast. On a closer inspection, I found no more physical damage on the three components listed above (cracks, some stains or heat damage. ) I intend to replace them first to repair the damage. Do you have any ideas as what simple tests I can perform to test the thee circuits before fireing the Axpert up again. The cost of a new motherboard and installation llocally amounts to +- 60 % of a new machine and sounds exorbitant to me . Thank you for your advice in anticipation.

Hi As an oldie of 80, I'm nnew to ths blog buisiness, but I urgently need informed advice.from you guys in the know how division. I installed a 4kW AXPERT Inverter linked to my PAYG Eskom meter aboout two years ago.. The system worked very well until now. I will have to send the Inverter charger in for repairs after an explosion sounding like a gunshot occurred inside the Inverter during switchover to the pass through mode .Consumption monitored in this setup was set not exceed 4 k W. I set the system to BPU mode which which worked extremely well for me, particularly at night time, resulting in the pass through facility kicking in timeously when needed.. During the day I only used solar and battery power by switching of the utility power altogether , consumption monitored ( effergy monitor. )!not to exceed 3.0 k W. Periferals to AXPERT. 10 x 360 W mono-crystalline solar panels. 12 x 110 A/ Gel based batterie ( 330 A/h ) I suspect sometng blew up in the D.C. To D.C. Charging unit as small fragments were found there. There seems to be no further physical damage in either the utility charger or the Inverter self, well as the Mosfett and MPPT's. Thank you. Questions. What could possibly have caused the disfunction ?? where can I have this inverter adequately repaired by experts at a reasonable price.