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Solar Inverter Sizing
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<blockquote data-quote="mikelaluz" data-source="post: 1457862" data-attributes="member: 1552"><p>Hi jamj</p><p></p><p>If your installer is suggesting this then he knows his stuff - The reasons are as follows in the UK...</p><p></p><ul> <li data-xf-list-type="ul">PV modules operate for much of the time below the <em>nominal rated power. </em>Nominal rated power is the output of the module under standard test conditions (stc) - a condition reached relatively infrequently.</li> <li data-xf-list-type="ul">Following on from the above, inverters will spend much of their time operating at power levels below the nominal array rating.</li> <li data-xf-list-type="ul">Inverter efficiency is lower when it operates at low power levels (look at a few inverter efficiency curves). By a degree of inverter under-sizing, it is possible to take the normal operating regime higher up the efficiency curve – and hence decrease inverter losses at times of normal irradiance levels.</li> <li data-xf-list-type="ul">Module / array output decreases over the lifetime of the PV system</li> </ul><p>Hope this helps</p><p></p><p>Kind Regards</p><p></p><p>Mike Smith</p></blockquote><p></p>
[QUOTE="mikelaluz, post: 1457862, member: 1552"] Hi jamj If your installer is suggesting this then he knows his stuff - The reasons are as follows in the UK... [LIST] [*]PV modules operate for much of the time below the [I]nominal rated power. [/I]Nominal rated power is the output of the module under standard test conditions (stc) - a condition reached relatively infrequently. [*]Following on from the above, inverters will spend much of their time operating at power levels below the nominal array rating. [*]Inverter efficiency is lower when it operates at low power levels (look at a few inverter efficiency curves). By a degree of inverter under-sizing, it is possible to take the normal operating regime higher up the efficiency curve – and hence decrease inverter losses at times of normal irradiance levels. [*]Module / array output decreases over the lifetime of the PV system [/LIST] Hope this helps Kind Regards Mike Smith [/QUOTE]
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