36 cell solar panel

Hi I am going to attempt my first DIY solar panel. I am having some confusion thou. This perhaps a stupid question yet it bugs me. Why perform most so referred to as 12V solar panels have actually 36 cells. Each cell is .5V therefore creating 18V. A 12V battery just calls for 13.8V to charge, so why 18V???
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ghurdSuper Hero Member PlusPosts: 8059
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Many human being suppose a FLA battery requirements 14.4V to gain "full".More than 15V to equalize.Blocking diode uses up 0.7V. (edited typo)Wire losses usage some volts, as perform physical relations (favor terminal link on the battery termial, both for the wire and also battery post).Hot panels make less volts, loved one to peak power.Less than perfect sunlight (1000W/m^2) moves the peak power graph to the left (towards 0) and down.And the top power is typically closer to 0.47V per cell, which in itself is a whole volt.Might Google "self regulating solar panels" which generally used 30, maybe 32 or 33 cells.The concept was if they can not make amps at enough voltage, then they did not require a charge controller.Problem was they can bacount charge a battery, making them around usemuch less.Use 36 cells.G-
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RoverHero Member Posts: 788
Hi I am going to attempt my first DIY solar panel. I am having actually some confusion thou. This maybe a stupid question however it bugs me. Why do most so referred to as 12V solar panels have actually 36 cells. Each cell is .5V therefore developing 18V. A 12V battery just needs 13.8V to charge, so why 18V???
Better off having actually a controller control somepoint to manage , as opposed to having actually not enough to worry about regulating.

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I suspect that many kind of people wonder about this so for now I"ve made the threview sticky, yet maybe we can edit a attach to it right into a library thread / FAQ at some allude...RgdsDamon
...probably we have the right to edit a attach to it into a library threview / FAQ at some suggest...-And maybe incorporate a basic graph of the current dropping off as the voltage gets better than 16V or so, too. Such graphs are had via many big commercial solar panels, now, to assist NEC code installations and establishing the MPPT, yet the details is additionally excellent for answering this sort of basic question and explaining just how they job-related.

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No one believes the concept except the one that occurred it. Everyone believes the experiment other than the one who ran it.System spec: 135w BP multicrystalline panels, Xantrex C40, DIY 8ft diameter wind generator, Tri-Star TS60, 800AH x 24V AGM Battery, Xantrex SW4024www.sparweb.ca
You can make identical sub-panels of much less cells, say 6 to 10 cells each, and also area them in series to construct beneficial voltages - no regulation says you have to put 36 or 40 cells on one sheet of glass. I think I would certainly rather repair or refurbish smaller sized panels, particularly if it requires a finish do-over.
And a quick note - tradition voltage residence made panels would certainly only play nice with prefer panels unless specs were haburned out prior to hand also. A six cell panel would certainly make a nice heating facet cludged in to the wrong circuit.
Many commercial panels pump out 19 to 21 volts to gain the greater amperage . The panel itself hregarding conduct and produce power . So you need to think in regards to the panel hregarding conduct 12 and produce power over that to obtain the cells to exadjust ions in the solution. The included voltage (or press )get"s translated into amperage to your occupational . One of the fun points to to via solar panels in charging circuits is to add inductive tons in line . Put some 12 volt fans in series (via some by pass switches in there too )on the charge line and also watch the sunlight play via the circuit . You"ll find the charging is not that much various on sunny days.
In enhancement to the already stated concerns (voltage drop from charge existing in panel (and also other) resistance, voltage reduction from hot panels, voltage drop in the diode), having added cells does not hurt anything (except your pocket book B-) ).Solar cells are fundamentally constant-present gadgets (if they have sufficient voltage to push the current). Each took in photon creates one electron-hole pair. Up to a certain fraction of them deserve to be separated by the interior doping, through the electron fed to the negative terminal and also a hole filled by an electron from the positive terminal (releasing a tiny power as heat).Hook a panel to a load at a lower voltage than its potential output and the panel"s output will certainly drop till the existing is the amount created by the leastern illuminated cell. The panel will heat up a little more than if it were driving a greater voltage (bereason the electrons from the positive electrode have a little bit more energy as soon as they loss right into the holes). But it would certainly warm up still more if it were just sitting in the sunlight through no fill and all the electron-hole pairs were all recombining without taking a expedition via the outside circuit and also releasing the full 0.6V electron-volt of bandgap difference energy.Similarly it"s OK to short a panel: It heats up the exact same amount as if it were unhooked. The warmth is dispersed a small differently (some in the wiring rather than all in the semiconductor). But that"s not an concern. As an outcome of this, some solar panel controllers stop overcharging the battery by shorting the panel(s) upstream of the blocking diode, in order to maximize power yielded to the load. (A parallel, shorting, transistor wastes power when you do not desire to usage it because you have all you require. A series, circuit-opening, transistor wastes power because of its voltage drop as soon as you want to use as much as you deserve to gain.)