<html><head></head><body bgcolor="#FFFFFF"><div>Hi mick</div><div><br></div><div>I'll take a stab</div><div><br></div><div>First one yes would work </div><div>But the second would not as the watts don't equal the load so the resistor isn't the correct size any more</div><div><br></div><div>The LCB won't help because it won't make watts but amps to help start motors and this isn't a motor and it works in pulses which a constant load isn't impressed with but a motor is. </div><div><br></div><div>You must have a reason to suggest such a "hypothetical " situation, no?</div><div><br></div><div><br>Jay</div><div>Peltz power</div><div><br>Sent from my iPad</div><div><br>On May 19, 2012, at 3:35 PM, Mick Abraham <<a href="mailto:mick@abrahamsolar.com">mick@abrahamsolar.com</a>> wrote:<br><br></div><div></div><blockquote type="cite"><div><div>Hi, Wrenchies~</div><div> </div><div>Kindly educate me regarding PV behavior when the load is a resistor. Here's a hypothetical situation:</div><div> </div><div>* Eight 250 watt PV modules (60 cells per module), all connected in series for "peak" ratings of 240 volts DC & 8.3 amps </div>
<div> </div><div>* Lab type cell temperature & illumination so that the eight would truly pump 2,000 watts <strong><em>into an ideal load</em></strong></div><div> </div><div>* A 240 volt AC heating element designed for 2,000 watt heat dissipation at 240 volts AC...that's about 29 ohms resistance for the heat element</div>
<div> </div><div>* Connect the PV string to the heat element, with nothing in between except a fused disconnect.</div><div> </div><div>In the above situation, would the resistance of the heating element be all that's needed to force the PV array to operate near the "peak" wattage?</div>
<div>Would the heater actually get 2,000 watts to turn into heat?</div><div> </div><div>+++++++++++++++++++++++++++</div><div> </div><div>Now consider the same cell temperature but half the illumination. That's similar voltage but half the amps at peak wattage. If this is sent into the same 29 ohm</div>
<div>resistor--again with no intervening electronics, could we count on 1000 watts of heat?</div><div> </div><div>If the answers come up "no", would the power throughput be helped by a SolarConverters style MPPT pump controller (Linear Current Booster kinda thing), assuming that one could be found to operate in the 240 volt range?</div>
<div> </div><div>Thanks & Jolliness,</div><div><br clear="all">Mick Abraham, Proprietor<br><a href="http://www.abrahamsolar.com" target="_blank">www.abrahamsolar.com</a><br><br>Voice: 970-731-4675<br>
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