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Motorhome Solar Power System Issue
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<blockquote data-quote="condor22" data-source="post: 248436" data-attributes="member: 1932"><p>Bill, I wasn't aware earlier re the DC panel output volts. Herein lies the biggest issue, they are well above most controller voltages, however the total output is nominally only 16.24 A. Which means that when going through a controller down to 13-14 V for a 12 volt system most of the 250 W will be absorbed by the controller in stepping down. I would expect your solar input to be about 14+ amps max, which equates to less than 200W. You won't get half of the 250 x 2 panels = 500W when on a house system.</p><p></p><p>I get the same from my 2 x 100W panels that run at about 19VDC before the controller.</p><p></p><p>So in my opinion house panels are not the best option. </p><p></p><p>Your panels W - A x V or W = 8.14 x 31.06 = 252.8 W</p><p></p><p>however you won't get more than 8.14 A at output and the voltage is about 14.4 at boost so the W = 8.14 x 14.4 = 117W.....</p><p></p><p>I kind of think your whole problem has been that you have never got close to half of the 500W you thought you had....... check this with you sources and let me know if I'm correct.</p><p></p><p>I'm in the goldfields for 6 weeks, so not online often </p><p>Mike</p></blockquote><p></p>
[QUOTE="condor22, post: 248436, member: 1932"] Bill, I wasn't aware earlier re the DC panel output volts. Herein lies the biggest issue, they are well above most controller voltages, however the total output is nominally only 16.24 A. Which means that when going through a controller down to 13-14 V for a 12 volt system most of the 250 W will be absorbed by the controller in stepping down. I would expect your solar input to be about 14+ amps max, which equates to less than 200W. You won't get half of the 250 x 2 panels = 500W when on a house system. I get the same from my 2 x 100W panels that run at about 19VDC before the controller. So in my opinion house panels are not the best option. Your panels W - A x V or W = 8.14 x 31.06 = 252.8 W however you won't get more than 8.14 A at output and the voltage is about 14.4 at boost so the W = 8.14 x 14.4 = 117W..... I kind of think your whole problem has been that you have never got close to half of the 500W you thought you had....... check this with you sources and let me know if I'm correct. I'm in the goldfields for 6 weeks, so not online often Mike [/QUOTE]
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Motorhome Solar Power System Issue
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