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h_1985

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Posts posted by h_1985

    PVSyst training???

    in How-to

    Posted

    No, we don't organize training sessions elsewhere than in our offices at Geneva (except sometimes for the team of a company).

    Thanks for reply

    training program on your site talking about on-grid systems >>>> do you have any training course about off-grid systems or solar pumping ????

    Module layout tool

    in Shadings and tracking

    Posted

    Hello,

    I'm running trial version PVsyst 6.4 ..... module layout tool button is deactivated always >>> how i can activate it please??

    i'm running simulation for 500 kWp ground mounted system grid tied

    i need to what is the meaning of module area in final report (ex. 3108 m2 for my system) >>> is that area including inter-row spacing between strings OR i must use module layout tool to calculate inter-row spacing areas and add them to module area??

    PV panels output

    in PV Components

    Posted

    Usually the PV array very rarely reachs its nominal power during operation.

    Except under special partial cloudy conditions (transitory conditions), or at high altitudes, the irradiance perpendicular to the PV module doesn't exceed about 1000 W/m2.

    But in these conditions the PV array temperature is at its higher values. A PV cell temperature of 55°C, with a temperature coefficient muPmpp of -0.42%/°C, will induce a loss of 12.6° with respect to STC (1000 W/m2 and 25°C).

    Now the inverter sizing is not really dependent on this: you can accept some hours of overload without loosing much energy.

    PVsyst offers an explicit tool for the sizing of the inverter. You can see that a PnomRatio (= PnomPV / PNomInverter) of 1.25 to 1.3 is quite acceptable in most cases.

     

    very rarely [/b] so we don't need to oversize inverter but array must be oversized

    that is the rule right??

    Another question please >>> 1000 w/m2 mentioned always in pv panels data sheets in STC condition means only Direct (perpendicular) irradiance only OR all global Irradiance???

    PV panels output

    in PV Components

    Posted

    Usually the PV array very rarely reachs its nominal power during operation.

    Except under special partial cloudy conditions (transitory conditions), or at high altitudes, the irradiance perpendicular to the PV module doesn't exceed about 1000 W/m2.

    But in these conditions the PV array temperature is at its higher values. A PV cell temperature of 55°C, with a temperature coefficient muPmpp of -0.42%/°C, will induce a loss of 12.6° with respect to STC (1000 W/m2 and 25°C).

    Now the inverter sizing is not really dependent on this: you can accept some hours of overload without loosing much energy.

    PVsyst offers an explicit tool for the sizing of the inverter. You can see that a PnomRatio (= PnomPV / PNomInverter) of 1.25 to 1.3 is quite acceptable in most cases.

     

    [attachment=0]Sizing_Conditions.png[/attachment]

     

    Thanks for reply

    But in all pv panels data sheets a term called power tolerance usually is (-0/+5), this term means panel output can exceed peak power by 5 watts or what?

    :?:

    PV panels output

    in PV Components

    Posted

    Hello,

    i need to know about somthing confusing me about PV panels

    the question about pv panel output, some people say that pv panel output can reach OR exceed peak power shown on nameplate and then oversize inverter to be able to override increase in output

    other people said that pv output power cannot goes to rated peak power OR exceed this value

    what is the right concept :? :? ??

    any help

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