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Subject: Re: have inverter plans need help
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Date: 04/29/02 at 1:39 AM
Posted by: BBL
In Reply to: Re: have inverter plans need help posted by Russ Kincaid on 04/25/02 at 7:07 PM:
The primary problems are input drive current, battery stack voltage, output load type, output waveform, drive power, and drive type. Your implied choice is stepup, transformer driven, push-pull configuration. Assume efficiency at 80% full load, 60% light load. At 1800 watts, you want a 48VDC battery stack to reduce xfmr cost and size, and input drive current. You will need a feroresonant 2250VA transformer to avoid a drop in output voltage with battery discharge.
You will swing (2x)battery voltage at the drive transistors, i.e. 2x50V at 12.5VDC full charge and 2x58.4V at 14.6VDC battery charge if a UPS configuration. Minimum collector rating is 150% if bipolar or mosfet and a "non-issue" if IGBT.
Transistor rating is full INPUT load in watts. Duty cycle is 50% but be sure to derate PD for temperature above 25degC as per mfr specs. --- This is not a low-cost project.
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