I am confused at what is the problem! Along with it is not waking up automatically when there is a loadsheding. smart charging LED remains blinking despite main power cut. If its hit by lightening then I am afraid the damage could be significant, it would be difficult to troubleshoot it without a practical examination.. Hi Sir, i have inverex inverter and not taking load on battery while AC power is off.problem started after phase and neutral swapped at AC input to inverter mistakenly.swap resolved but still the problem is thereonly one circuit breaker present (outside boday) for input circuit and that is fine as its function well on AC input means battery charged properly and load also taken well but when AC supply get off, all load gets zero while battery showing 4 (max) cells charged. can it it be repaired ? It suddenly started making vibrating sound with a hurriedly beep when on Battery Mode and after a while it drops the battery bar from 4 to 1 bar with “UNUSUAL” display on its LCD and later switched off. Measurement should be done at output wires from inverter to box.3.0 In case clip reading donot change in correspondence with panel meter, we may doubt problem inside inverter.4.0 during daytime, switch off all load and confirm meter reading.These observations may lead us in understanding the problem, Good day,I've got a IR series pure sine wave inverter with 48volt system. If so, how much would you charge? Hi Marthan, you said you removed the battery and replaced it directly with power source, I could not understand exactly what you did? Thank you very much for your reply,sir. After that He give me as repaired, but it only gives about 220v with 15V or more, for 12v input it gives an output of 190v. I bought a normal pure sine wave inverter and a separate solar charge controller. You may have to check whether or not the feedback is present or malfunctioning, or add a new feedback for the same. When I disconnect the ground from the inverter to the ship ground, (still connected inverter ground to GFCI outlet ground, it works, and powers all devices just fine. Main while I checked all bias resistor, the 20kohm and 47 ohm. your battery is OK for sure…the problem is in the charging controller changeover section, Hi Swagatam. Im just a kid don't know much about electronics. We can proceed accordingly once we know this. what is the problem???? How automatic inverter works. Hi swagatam I’m into repairs of Inverters and solar installation…Though I’m new in it. OK it may be because the MOSFETs might have got burnt. You will need an Inverter tester, Turn off the power. (not of me lol but of the inverter please)!! It had a blown capacitor which I replaced it with a higher vlotage. Light glows in both live and neutral. Sir if you getting any idea from my reply please help me. Hello Jack, the "mains to INV" changeover relay stage could be malfunctioning, open the inverter and check the relay stage which is responsible for implementing this changeover, and check the transistors or the IC associated with the relay switching action. Hi swagatam, How you doing? What could be the problem? 45vac Hot to Ground 45VAC Neut to ground 120VAC hot to Neut. what could be the problem. When you turn on the charging unit to charge battery, it beeps as well. Hi,sir I have a 1500w modified sine wave inverter (12V DC to 220V AC)(50HZ) .it’s got overload and stopped working i replaced the faulty mosfet .Unfortunately even though the device has been working,it has problem when i tested the output by millimeter it is around 60 volts AC (50HZ) instead of 220V AC how to fix it . I can judge a hardware fault, but a software fault can be difficult to judge! What is the problem? Now the problem is main power MCB is tripping some time when switch on the UPS, and DC power going down when I using the UPS. Hello Ahmed, it's not properly visible…please specify what those components are? The battery light comes on with some beeps with both voltages. for the last few days its giving unique problem whenever i connect only a ups through it, ups starts giving fast tic tic sound of relay and when i connect it to a power point which isn't through inverter, it works fine. I have 800 VA inverter which when plugged in with the mains even though the battery is fully charged , my meter runs faster than when plugged in on mains solely. Hi I have an Edecoa dpp35 12v pure sine wave inverter and I have short circuit the output. I have this kind of 1000w car inverter, I once connected the power wrongly and the mosfet got blown. How should I proceed from where I am now. I have a 2200W inverter to provide back up power for a sump pump. The important thing would be to check whether the battery voltage is reaching the inverter or not. If the bulb current is at least 50% less than the batter Ah then the battery must not drop to such low levels…otherwise the battery could be damaged too. Please help because I can’t use it now. Transformers usually don’t become shorted without burning or smoking, so it must be the power devices…. Could this be true so I can connect directly to battery? Hi Oloruntoba, It can be difficult to identify the fault without checking it practically, it seems to be some internal malfunctioning of the relay changeover circuit stage. Please what can do to rectify it? 3500w pure sine wave with terminal for direct connection, and several plugins on case. if yes then can you plz tell me the important steps to be taken……i read similar amswers but worried whether su kam might be having diffrent circuitry……plz help. and possibly what is the cause of the smoke and how to avoide future accurance, sorry that could be difficult to judge without a practical testing because a smoke could be caused due to many different reasons. sorry, that would be difficult to judge without practically checking it…. Hi, although im not very sure, if the smell is from the inverter while it's in switched ON positioned would certainly indicate a damaged tramsformer winding, but if it's happening in OFF position then it would need some investigation to see exactly what's burning (lol)….most probably it's the inverter winding that might have gotten slightly damaged due to the generator voltage in-surge. But when I checked the battery via a multimeter, it showed 12V. Hello sir. To ensure the above condition, you can refer to the datasheet of the mosfet and check the Drain-Source Voltage and the Continuous Drain Current parameters of the device, such that both these values are well above the load's maximum consumption values, or are selected with appreciable margins.. Hi Support ALU, the input phase/neutral can be connected anyway round, that cannot cause any problems to an inverter or AC operated unit. I suggested the idea of an external changeover just to make the operations independent of the inverter unit since the chaneover/charging operations are crucial to the inverter and the battery. What is the chance someone would know the specifics of the 120vac voltage sensing transformer in a Xantrex RV2012M inverter? Hi swagatamI have a sukam 750va inverter. Sometimes when the power goes off, the inverter immediately goes off to low battery. Hello Sir, I have a Whirlpool Elantra 700VA inverter. In most cases, related to inverter output voltage issues, the fault is with the output power devices. It can be difficult to judge the fault without knowing all the internal specifications of the system. 2: An actual-size, single-side PCB for the sine wave inverter circuit Fig. The battery is showing around 7 V DC. Brief on working of the said circuit towards force activation/de-activation of relay beyond upper/lower cutoff is also requested. Sir , I have a broken down inverter 3kva, MKS Axpert make, it uses a dc to dc booster I don’t know maybe it’s called transformerless inverter. I can't find my post, so I hope this reply gets attached to it. you can try replacing the faulty parts with new parts and switch ON the inverter with a series fuse,and without any load..and check the response step wise, https://homemade-circuits.com/2013/03/how-to-design-inverter-basic-circuit.html. The sharp rise and fall of the square waves are just not suitable for such applications. I have published many good battery charger circuits which you build and combine it with this power supply…one of them is this, https://homemade-circuits.com/2016/05/opamp-low-high-battery-charger.html, You were correct, the problem was with the relay pins, When I told you that the inverter wasn't working I was wrong for running the inverter battery should be attached and I think it's normal for the transformer to produce humming sound because it is a square wave inverter.I want your suggestions for the followings:1) Is it safe to run 32 INCH LED TV?2) I installed 8A fuse, Which fuse will be suitable because it's not written on the case of inverter?3) Is it normal for ceramic resistor getting hot?Thank you so much sir. Dear Sankar, OK, then it seems the internal preset adjustment of the UPS might have slightly changed due to mechanical vibrations. Thankful my mail:rgolpayegani@yahoo.com. Any method to reduce the output voltage from inverter. If inverter run on main line and fuse remove then still works. All fuses are busted. Check compressor windings all equal resistance 1 to 4 Ohms, check to earth 50 MOhm minimum, check run current and inverter outputs ; 41 Inverter compressor discharge sensor fault. the frequency could be checked at the source which connects with the gates of the mosfets…you can use your DMM's frequency range for measuring the same. it blew one more Mosfet and after replacing it together with its a gate resistors, there is no more short circuits and the inverter can switch on on battery mode and on ac mode. However it still charges my battery. But, even with the Electric switch on EB (not battery) and the button of the inverter OFF, I found the inverter charging with mains ON when they came at 6pm. If you can suggest a DIY version circuit for the above explanation will be useful for the beginners like me. Where could be the problem? Or should I take it as a lost cause? This charger doesn't have any issue when plugged in at home, even though the mains is ungrounded. The working of the Dc-Ac converter circuit is very simple. Today I found Mains to UPS mode is not working. From your experience is this likely to be repairable? So I think you can try replacing the burned SDC7500 with a TL494 and check the response. Here the received oscillating frequency is suitably amplified to high current levels using either power transistors or Mosfets. Hi I have microtek600 inverter which is not charging 150 ah battery even after proper connection and terminal of battery shows live current when tested with tester plz give solution, not sure, could be some internal malfunctioning, the authorized service personnel will know it better. how the timer board will get frequentlyfaulty?. As the name suggests DC to AC inverter is an electronic device which is able to "invert" a DC potential normally derived from a lead-acid battery into a stepped-up AC potential. the house electricity was accidentally mixed with my modified sine wave inverter electricity and as a cause the switch broke and the inverter stopped working, it was from the 220v output from the inverter, and i direct plug it to the house electric outlet by accident. Hi SwagatamI have a Sterling Power Products 300W pure sine wave inverter with a board made by Wenchi & Brothers in Taiwan, the model number being WHT-150/300A. Please clarify this point, once I understand this I will try to sort out the problem for you. I have BESTEK 12V DC To AC 220V Auto Power Inverter 200W Car Auto Power Inverter. The arcing stops when the current draw decreases at battery full charge level. Is it an overload condition? Worthy to mention I have single live wire connection for inverter to load & Neutral & earth being used from electricity mains. connect an ammeter in series with the battery positive, and verify if really there’s a short circuit happening somewhere or not…if not then it’s the LED indicator sage which may be malfunctioning. Have checked mosfet and all are in perfect condition. it seems your changeover relay section has some fault…you must open the inverter and check the section which is responsible for executing the automatic changeover and check why it may not be responding to the power failure, Dear sir, when I switch the main supply off. Will this be the case before replacement? Hello OLudare, you may begin by removing all the mosfets responsible for driving the transformer, and then check the gate source of the mosfets whether this source is correctly producing the frequency from the oscillator or not. Multi-Inverter air conditioner pdf manual download. But he has only 575VA and 875VA board instead of 800VA. Your problem made an interesting reading so thought of of understanding it more.We need to confirm that 1.0 There is no load being fed by circuit not routed through distribution box.2.0 Confirm the working of indicating meter by using clip on ammeter, before and after 5 PM. Because he is taking long time to order 800VA PCB from Company. When I switch it on now, the power LED gives a feeble light and a small beep sound (momentarily) comes and the unit goes to dead. If it is working OK, and also if the fuse is OK, then the problem naturally has to be in the switch. Any idea whether i could fix this myself? I am not a beginner in electronics, but not an expert, do you think I can put it working with your help? Thanks alot.i really appreciate your article on how to repair an inverter.it was well explained and comprehensive.i am just a beginner.i believe it will be very useful and helpful to me…. This is making 12v backup generator live to 40v ac and zaps someone when they go to start the generator. can u help me about the common circuits for shortcircuit detection or help me to find the damaged component. Disconnect the compressor lead from the compressor terminals. Sorry I do not have a schematic for this…basically all inverters work with an identical principle so fault finding shouldn't be too difficult, if it's done by isolating the stages and checking them step wise, Hi, I have a power Tech-on 1000w pure sine inverter. You may have to diagnose the wiring, and what exactly the GFCI is detecting and tripping, you can one by one disconnect the wires from the GFCI and check which wire is causing the issue. or may be your battery has become defective, check the response by replacing it with a fully charged new battery. Am new here and also newbie to electronics and I want to explore, learn as and become an expect. Please help me, I don't want to spend more money on buying another inverter. Thanks. is that relay switch problem or something else? 1) Set the DMM to the diode range. Hi Swagatam Congratulations for your excellent forum. Any idea what to check please? Interesting read, thanks for sharing. Hi Swagatam, I have an inverter ( 300W Meind ) which short circuits when I give power to it to power on. Though the boosted response is an AC, it is still at the battery supply voltage level and therefore cannot be used to operate electrical appliances which work at higher voltage AC potentials. you can probably solve the issue using an external relay changeover system with a battery charger which cab be independent of the inverter and yet provide you with the required automatic mains to battery changeovers and also charge your battery while mains is present, Hi..sir…what is the voltage value output at amplifier, Happy new year, pls i saw my sukam 1400 on smoke, so i put it off, then on cooling down, i try to putit on, but its not working, no ligths at the dash board. Hello, swagatam, you are really doing great job, helping a lot of people, it is appreciated. We all know how a transformer works; in AC/DC power supplies it is normally used to step-down the applied input mains AC to the lower specified AC levels through magnetic induction of its two windings. - Disconnect the 120 VAC power supply from the inverter board. Please let me know. I replaced them and when I connected the invertor back to the battery there was a spark and two more of the fuses blow. and I think battery is not charging. It can be corrected by opening the inverter and adding an automatic voltage correction feeedback, or by using an external voltage stabilizer unit. <> After a lightning strike, it trips off when switched on. 3) Occasionally, transformers can also become the major cause for a malfunction. The inverter is not detecting DC voltage but I do not have a warning message. Do you think I have a burned out transformer too? Because voltage at the output might malfunction mostly if the transformer is partially burnt or the mosfets are not operating uniformly. The other GFCI is grounded to the common ground which includes a connection to the DC negative, the shore power ground (green wire), ALL ground wires for all devices, and outlets, (except inverter), and the frame, and a jumper to the neutral Bus on all outlets (except inverter). Since the MOSFETs switch the primary of the transformer in a push-pull manner, this induces an alternating 220V or 120V AC across the secondary of the transformer. most probably the mosfets or the power devices are burnt…because the AC might have powered the transformer in the reverse way causing heavy current to flow into the mosfets blowing them off…this is my assumption. If the whole thing is concealed and wired then it could be difficult to use external circuits with it, rather it would be better to get it completely examined and corrected by the repair personnel. My question is do you know what would be the first component to go in a situation like this? I don't know well about schematic form but I tried to clarify everything in the pic.SMPS will get power from (AC main) and the (L) wire of the smps will be connected to the relay and (N + E) wires will be connected to 3 pin Socket.Relays are connected in parallel and getting power from smps, the inverter input wires will be connected to 3 pin socket of my circuithttps://drive.google.com/open?id=0B_2QrDIghjN1MzBOYVlYY2hBbTQ. it will be running at start but not to full load up to 75%, at a particular time (3mins) it will just off and on again. You may have to isolate the MOSFET stage from the oscillator stage and check them separately to verify whether any of the two stages are still OK, or the damage is across both the stages. Thanks a lot. Inverters which provide sine wave outputs or the ones which use PWM technology to generate modified sine wave can be difficult to diagnose and troubleshoot for the folks who are relatively new to electronics. anyway you can confirm the condition of the battery by removing it from the inverter and by checking it with an appropriate load, if it shows quick discharging symptom or if it shows sluggish response while getting charged you can assume it to be dead or in a bad condition…. Hi Sir, My inverter goes into Low Battery modend instantly goes back to normal inverting when I put on my 120watt TV. Alexander, you can try disconnecting the transformer from the MOSFETs, and check again, if the problem is solved then the MOSFET may still have problems, it will need to be diagnosed deeper with a multimeter. Bias resistors will be OK, they are not relevant since the MOSFET will blow due to a short circuit or high current across drain/source. If the MOSFeTs are n channel, connect 1K resistor across their gate/source and remove the the input clock and switch ON the supply through a 2 amp fuse. When the inverter is connected to the boat battery pack, it’s negative 12v input is also tied to the boat’s frame. My issue with a ready-made inverter is not considered here. In history, PCBs were been developed by going through a complicated procedure of point-to-point wiring and these circuits were highly exposed to get failure or damage. We ended up simply placing the whole PCB directly on top of the capacitors. Hello sir.i have a ups Lebanon make.3700va,.it's now beeping n indicating inverter off/charger on from time to time.what might be the problem n what's the remedy for that. He is the only hope in my area. Why would it only short when something is plugged in… and why would it short when passing through current from the wall as well as when producing inverted power from the batteries? 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