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According to the numbers you shoud be okay
Posted by Eric Law (more from Eric Law) on Sun, 28 Oct 2012 04:38:11
In Reply to: Electricity question (Sandy preparations), Name Left Blank, Sat, 27 Oct 2012 19:07:46
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If the inverter's ratings are honest, you should be fine - as you say the battery will supply the extra current to start the pump.
My biggest worry would be that the inverter's ratings are exaggerated - that's pretty frequent with electrical equipment these days. Go look at a shop-vac rated "3 horsepower" and then do the math to find out you can't get 3 horsepower worth of electricity out of a regular 120V outlet!
Anyhow, a few other random bits of advice:
1) the alternator may not produce output unless you hook up a small bulb to the terminal normally used for the alternator light in the instrument cluster. Power coming into that terminal is used to "jump start" the alternator - once it starts producing output, it's internal needs are met by its own output.
2) Make sure it's spinning at high enough RPM or you won't get full output. Keep in mind there's probably at least a 3:1 step-up ratio between the Saab engine crankshaft pulley and the alternator. So if the alt produces max output at 5000 crank RPM (which would be typical), the alternator needs to actually be spinning at 15K RPM!
3) Probably the most important point of all: TEST this setup before you actually need to use it!
posted by 72.93.22...
Posts in this Thread:
- Electricity question (Sandy preparations), Name Left Blank, Sat, 27 Oct 2012 19:07:46
- Our son in DC is nervous too, MI-Roger
, Sun, 28 Oct 2012 07:52:30 - Re:$79 Harbor frieght generator., Brian, Sun, 28 Oct 2012 06:49:28
- According to the numbers you shoud be okay, Eric Law, Sun, 28 Oct 2012 04:38:11 <-- Viewing This Message
- Re: Electricity question (Sandy preparations), TML
, Sat, 27 Oct 2012 20:15:33 - note: well pump is 120 volts...n/t, rob
, Sat, 27 Oct 2012 19:09:30
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