Hi, ive been trying to power a 30watt solar attic at night with a 30v/5A p.s. The p.s went a week running at 25v before it 'blew up', it won't go over 7v now. I didn't have a diode in the ckt, should have I used a lower voltage/higher current ac_dc converter instead? I was looking to speed up the fan when using utility pwr vs the 17v it runs on during the day(there's a pass through to the bedroom below if your wondering why). Opinions?