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43 <br />- 1 - <br />1 Background <br />Advanced Energy Industries (AEI) wishes to document the sound power levels generated by the <br />Solaron 500, a 500 kW inverter AEI has requested that the testing of the fuel cell be performed per <br />the ISO 3744 -1994 Standard We visited the AEI facility on Thursday, 1 April 2010, to perform the <br />testing <br />Since sound power is a property of the source being tested (rather than the cumulative result of <br />multiple sources interacting with the environment), these data are applicable to many different <br />installation conditions In this document, we report the measured sound power levels and sound <br />pressure levels and provide commentary on how we would insert this source into computer -based <br />noise propagation models <br />2 Description of Inverter <br />The device under test was designated as Solaron 500 model number 3159500 -0000 Al (with 311 <br />enclosure), a 500 kW inverter, manufactured by AEI in March 2010. The inverter had a serial <br />number of 750385 F/R Al The inverter was 1 83m wide x 0 97m deep x 2m high <br />The inverter was mounted on a rigid wood platform constructed using 2x4 studs and rigid foam <br />The platform raised the inverter 0 2m off the floor The reference box established for the inverter <br />had the following dimensions L1 = 1 83m, L2 = 0 97m, L3 = 2 21m <br />The inverter was supplied DC input voltage by power generation equipment located in an adjacent <br />room <br />3. General Methodology <br />We measured the sound pressure levels generated by the inverter per the ISO 3744 -1994 Standard <br />During the measurements, we collected the overall un- weighted equivalent continuous sound level <br />(LEO), as well as the un- weighted 1/3- octave band spectra from both the inverter and ambient <br />conditions The measurement duration at each microphone position was 60 seconds <br />To measure the inverter, we established a parallelepiped measurement surface 1 meter from the <br />reference box The resultant measurement surface had the following dimensions L1 = 3 83m, L2 <br />= 2 97m, L3 = 3 21m, and totaled 55 01 square meters We used 9 microphone positions, per Figure <br />C2 of the ISO 3744 -1994 Standard For all 9 positions, the fixed microphone position technique <br />was used <br />VIBRO ACOUSTIC CONSULTANTS • 490 POST STREET, SUITE 1427 • SAN FRANCISCO, CA • 94102 • USA <br />PHONE ( +1) 415 693 -0424 • FAX ( +1) 415- 693 -1398 • INTERNET http • / /www va- consult com <br />