Jump to content

Production from bifacial model


timgreen13
 Share

Recommended Posts

Dear timgreen13,

1. This is correct, there is no entry listing the total energy gain. You could state "The rear side of the module areas provides additional 24.85kWh of usable radiation (2.25% of the radiation after the previous gains and losses were added) per square meter being available for energy conversion". You could use this to estimate the total energy gain for the system.

2. The bifaciality factor is given by the modules and typically ranges between 0.7...0.8 (70...80%) https://help.valentin-software.com/pvsol/2021/en/calculation/pv-modules/bifacial-modules/

I hope this clarifies your question.

Best regards!
Frederik

Link to comment
Share on other sites

Dear timgreen13,

no. The fact that the radiation gains are at 2.25%, there must not be a higher system gain! Have a look at this table:

image.png.c259ba6bcf0394c870ca26564deb23e5.png

Gain/Loss are the values from your results. On the right side you can see the percentaged change of the accumulated values illustrated by the yellow bar charts (as shown in the table). The gain of 2.25% is based on the last accumulated value (1104.97kWh/m²) which means the bifacial gain part results in 2.20% of the global irradiation onto the module (1129.82kWh/m²).

The weighting of this additional irradiation to the rear side is 70% for the modules you have chosen. This 70% bifaciality factor means another 30% reduction of the rear side radiation, which results in another -0.66% losses.

In total this means 1.54% more energy compared to an analogue one-sided module which seems reasonable.

Best regards,
Frederik

Link to comment
Share on other sites

While answering your question and after some tinkering with some bifacial modules: Here are three projects with the same location and inverters and reasonably comparable modules (I attached the projects too):

1. South orientation, non bifacial

image.png.b2e638028d2c00f348f35e5f8bbe4ae8.png

 

2. South orientation (same as first), bifacial

image.png.99baffbb159ea460ecb621b5246fe0d8.png

 

3. East-west orientation (90° inclination), bifacial

image.png.540d148f8def11d94d1172010a5879e6.png

 

Where bifacial modules clearly shine is the third project, bifacial east-west 90 degree inclination. Naturally this is one of the most interesting of applications: Agricultural PV systems, perfect due to the doubled area usage plus the flattening effect for system operators.

south-nonbifacial.pvprj south-bifacial.pvprj east-west-bifacial.pvprj

  • Like 1
Link to comment
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

 Share

×
×
  • Create New...