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about power inverter.Solar Panel Inverter diagram

Question:

Hello Is there some inverter with an input voltage regulator ? Well, with a solar panel or a wind charger, the batteries bank are charge at any time, even wen you used them.Solar Panel Inverter diagram  I measured the voltage of my battery when it’s on charge, and it’s goes to 14.7 volts, and an inverter are for about 12 volts input, so most inverter give a 120 volts AC output with a 12 volts input, so it’s 10 time the input voltage, at 14.7 input voltage it will be 147 volts AC ouput !!! So, at some time of the day it charge at same time that you ysed some power from your inverter to run something, but with a 14.7 volts input, you can have a 147 volts output from you inverter, hard for your equipments and appliances ! So, is there some input voltage regulator with most power inverter ?? Solar Panel Inverter diagram  To keep the output at arround 120 volt and not up to 147 volts.Solar Panel Inverter diagram

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- Solar Panel Inverter diagram, so it’s 10 time the input voltage, at 14.7 input voltage it will be 147 volts AC ouput !!! So, at some time of the day it charge at same time that you ysed some power from your inverter to run something, but with a 14.7 volts input, you can have a 147 volts output from you inverter, hard for your equipments and appliances ! So, is there some input voltage regulator with most power inverter ?? To keep the output at arround 120 volt and not up to 147 volts. Solar Panel Inverter diagram

Dear Jean Instead of regulating the input to the batteries, regulate the voltage from the batteries to the inverter with a car regulator. Solar Panel Inverter diagram. Any voltage above the OCV of the battery is overcharge and the battery does not retain it when under load. If you disconnect the charger from the battery and allow it to sit for a few hours and then measure the terminal voltage you will read a voltage between 12.65 and 12.8 volts depending on the type of battery. That is the OCV or open circuit voltage of the battery. There is no need to worry that the inverter will run at the high voltage as long as the inverter is loaded. Your inverter should have a low voltage cut off to shut it down when the battery reaches between 9.5 and 10 volts so as to not discharge it too deeply which may damage it.  By the way, you should not be charging the battery much above 13.5 volts if you expect it to last very long.Solar Panel Inverter diagram

Response:

Actually, your equipment gets more than 147 vts. all the time. The 120 vt standard is RMS (read Root Mean Square) and (techno – wizards don’t flame me!) its an “average” of the useful voltage.  Undercurrent is more damaging than slight overcurrent.  Dragging motors heat up, etc. Also, the amperage of the charging circuit is not as strong as the potential your battery has, so unless it’s a very small appliance the extra voltage wouldn’t be noticed much.  If you are concerned, buy a surge suppressor for the 120 vt end.  Much less expensive solution to a minor problem.Solar Panel Inverter diagram

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In following up an e-mail; I submit to the net for general information, please take this with a grain of salt,  there are many ways of arriving at the same place: Hi How they do that regulation ?Solar Panel Inverter diagram

I don’t know how well you understand electronics and the theory behind all of this but to make it breif… The basic concept behind output self regulation is to take the output signal (120 VAC) and to “invert the phase” 180 degrees and then send this signal back to the input of the circuit, and sum it with the reference input signal.   This principal is called ‘negative feedback’.  It is used in all types of signal processing, even audio amplifiers. Solar Panel Inverter diagram   Whether the process is digital or analog it is the same if effect. Anyhow, in an typical inverter scheme there is some type of a reference oscillator that produces a constant level and constant frequency signal.   This signal will go to a ‘buffer amplifier’ circuit which conditions the signal even further by being able to make adjustments to various parameters of the signal such as varying the pulse width or amplitude. This signal can be fed into a very high power amplifier which feeds a transformer that is the source for the AC signal that you use to light a light or run a computer.Solar Panel Inverter diagram  (There are a number of varaitions on this process but this is the basic idea.)   The ‘hot’ lead signal (120VAC) is filtered and processed (inverted) as needed and then the signal is sent back to the input of the buffer amplifier.  This feed back loop is a ‘negative feedback’ Changes on the output (such as no load or maximum load) will affect how much drive the buffer amp delivers to the power amp. In the home power arena, some use a square wave output,Solar Panel Inverter diagram while others have what is called ‘modified sine wave’ while others have an output signal that resembles a pure sine wave.  The net effect is for the inverter to output the equivilent of 120 volts ac RMS. (120 VAC RMS will deliver the same *wattage* to a load as does 120 volts DC, even though the peak voltages involved in the AC signal will usually be ~150volts peak to peak for a sine wave (remember that there are also periods of time that the voltage falls below 120 volts too.)) Hope this isn’t to confusing but without drawing you a simple diagram it is hard to describe in words….   You should check out the power supply section in the ARRL Radio Amaterurs hand book and also ‘negative feedback’ in any modern Electrical engineering book.  Also checkout therory behind ‘op amps’ or operational amplifiers. The therory is fairly simple.   The easiest way to check for good regulation is to connect a 7 watt night light to the output of the inverter…. it should glow at normal brightness. Next connect a fairly high wattage light in parallel and verify the the brightness of the smaller light dosen’t dim or worse…. get brighter.   Using a voltmeter to measure inverter output can be misleading in some cases.              Solar Panel Inverter diagram

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;Instead of regulating the input to the batteries, regulate the voltage ;from the batteries to the inverter with a car regulator.

OOPS! Is anyone out there aware that car “regulators” do not actually regulate 12VDC?  One example of a mechanics’ misnomer that has caused no end of trouble … the “regulator” is actually an alternator controller that controls the output of an alternator by varying the rotor current — it never even sees the main output.Solar Panel Inverter diagram   I don’t know if there IS a device that can actually reduce voltage at the kind of current a car uses under maximum load … that said, you CAN regulate the DC devices themselves (except for PV panels of course!) with these things since most of the best homebrew designs have automotive alternators to generate the DC.  You even get the little supervisory circuit that can turn on a warning light at the panel in case of failure … Solar Panel Inverter diagram

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I must add that Trace invertors are not particularly cheap.

no, not cheap — but then again, they’re UL and CSI rated for continuous use in a permanent residential installation and they contain enough wits to be able to handle just about everything you can throw at them … including hooking two of them together to make a 240V split-phase feed (they synchronize phase automatically, both to themselves and to the intertie feed) … so they’re probably worth all of that and more. I’m seriously thinking my next house is going to have to have a couple of SW4024’s in it …Solar Panel Inverter diagram

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: I must add that Trace invertors are not particularly cheap.   Show me any inverter that is cheap that is not also CHEAP in terms of capability and componantsSolar Panel Inverter diagram.   13.5 is not the correct voltage to recharge a 12 volt battery.  14.5 volts is correct.  And with deep cycle batteries you want to run the voltage all the way to 16 volts at least four times a year.  What? Did he say 16 volts?  Yes and I meant it. If you don’t over charge deep cycle batteries they don’t last as long.  You need this high voltage to even out the cells and push the last of the sulphur out of the plates.  (Lead acid)  Don’t wish to upset anyone, but this is important. I ruined a set because I didn’t “Overcharge them”. -Stephen Hatch

Well, as usual in these cases, the answer is a bit of each.  While charging discharged batteries, the ideal voltage might be 14.5.  = If there are differences between the states of charge of the cells, you should equalise, over 15 volts.  But happy, full batteries o= n ‘float’ like 13.5 best (13.8?).Solar Panel Inverter diagram.  You get worse problems from high starting surges, and from the reaction of equipment to the crude waveform.  for example, thyristor controlled dimmers, laser printers etc, cannot handle modified sine wave.

I’ve just discovered mofified sine wave can be fatal for some things… An electronic programmer which used a resistor-capaciter voltage dropper instead of a transformer power supply gave some nice wisps of smoke when running on the inverter as the resistor overheated drastically. I’ve come to the conclusion pure sine wave is the only safe way to go if you’re running anything more complicated than a power tool  Solar Panel Inverter diagram

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