Re: [RE-wrenches] Reactive Power

Hi drake, The batteries see watts The inverter sees VA jay > On Dec 17, 2019, at 7:17 AM, drake.chamber...@redwoodalliance.org wrote: > >  > Hello Wrenches, > > I checked my laptop with a Kill A Watt meter. It drew 25 W,but 49 VA. Which > number represents the true draw on the batteries? >

Re: [RE-wrenches] Reactive Power

Hi Drake, 25W should be the draw from the batteries after accounting for inverter efficiency. Note that the low power factor will reduce the effective inverter efficiency, since the inverter still has 49VA of reactive power causing losses. For a small switching power supply like the laptop's,

Re: [RE-wrenches] Reactive Power

The 25 W would be used to size the batteries, 49 VA would be used to size the inverter. Good luck, Will -- *Will White* Curriculum Developer e: w...@solarenergy.org w: www.solarenergy.org p: 802-272-3092 NABCEP Certified PV Installation Professional # 093006-34 *FACT: If we covered 0.33%

[RE-wrenches] Reactive Power

Hello Wrenches, I checked my laptop with a Kill A Watt meter. It drew 25 W,but 49 VA. Which number represents the true draw on the batteries? Thanks, Drake ___ List sponsored by Redwood Alliance List Address: RE-wrenches@lists.re-wrenches.org