many lies uncovered , more truth than they want you to know, based on low wind area,s 5-15 mph
Sunday, May 1, 2016
1000w worth of lies
hi everyone, today I was able to test a 1000w pma , brand new and out of the box. this was sold as a 1000w 3 phase ac low wind pma. so lets see what the test bench has to say. first we checked the open circuit voltage, this is how they sell them. we got 88.6 volts at 800rpm, next we checked the dead short amperage, we got 14.81amp and it was stalling the test bench motor at 325rpm. so far the numbers were not what was advertised but the use of these numbers gives a wattage of 1312watts. so lets see the real word numbers. we installed the pma onto the test bench, the controller was set for a dump of 13.9 volts into two 1000cca auto batteries, the batteries were at 12.81 volts at the start of the test, the dumps used were 2 200watt waist resistors. so lets see the real world at work. first we tested for cut in rpm, the batteries started to charge at 290 rpm, just a little high for low wind, next at 500 rpm we were seeing 3 amp =41.7 watts, next at 700 rpm we were seeing 5.5 amp = 69.5 watts, next at 850 rpm we were seeing 7.6 amp = 105.64 watts, next at 1000 rpm we were seeing 9.7 amp = 134.83 watts, next was all out for the test bench with this pma and direct drive gearing, 1565rpm and we were seeing 11.4 amp = 158.46 watts. so after looking at the wattage the pma owner asked , where the hell is my wattage that I payed for, like I said at the beginning of the test, this will show the REAL WORLD USABLE WATTAGES. the advertised wattage is almost allways derived from the open circuit and dead short numbers and do not mean any thing at all, JUST A SALES PITCH. this is a reasonable pma and has cogging witch will cost more for blades to make it run properly in low wind like it was sold as, a low wind pma ? . from experience you could expect to see a average of about 4-8 amp from this unit, a far cry from the sales pitch of a 1000 watts they made it look like. it all comes back to home work, the scammers are everywhere, this type of wattage calculation is almost a standard and is a flat out lie and deceiving to the buyers. the only numbers that matter are the numbers that are going into the battery bank and are useable, the rest is all bs. add the numbers and do the math, you will find so many lies so fast it will make your head spin. this pma was from the southern states but all most all the sellers calculate the same way, food for thought. thanks for reading.--------------------------------------------------------------- a update, this pma has been in service for only one week and has failed , it has one burnt phase and seems to have burnt in the center of the windings in one phase. this would be a manufacturing problem. not shure if this type of problem can be found but buying quality parts will help. try your best to get quality parts, there not always from the biggest sellers.
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