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20 panel commercial use payback
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<blockquote data-quote="binky" data-source="post: 450566" data-attributes="member: 490"><p>that's quite a heavy shading factor. Could you post a google earth view of the roof so we can get a better idea of what you are talking about.</p><p></p><p>There's a few other factors to consider.</p><p></p><p>1/ what your connection to the grid is, ie single phase, 3 phase or something else. Rule of thumb is that we are allowed 4kW per phase. Bigger connections are allowed by approval from the grid operator (DNO) sometimes - needs to be applied for before commencing works.</p><p></p><p>2/ East / west arrays offer better power spread, but for your opening hours something more south facing might be better, unless you have electrical items running all day and night like web-servers, window display lights etc etc.</p><p></p><p>3/ it sounds like it is really worth considering energy saving measures like LED lighting over installing panels</p><p></p><p>4/ albeit the figures aren't great, you have to consider the energy savings over 20 years (and beyond, the panels don't stop working when the FiT payments stop). Add energy inflation at 5-6% a year and it all looks far more interesting</p><p></p><p>5/ I'm not a fan of flat roof arrays either, they can be a bit complicated at times, but if you can get some due south panels as a result, then it can work for you?</p><p></p><p>as a sales point, 'going green' can be useful for promoting your business</p></blockquote><p></p>
[QUOTE="binky, post: 450566, member: 490"] that's quite a heavy shading factor. Could you post a google earth view of the roof so we can get a better idea of what you are talking about. There's a few other factors to consider. 1/ what your connection to the grid is, ie single phase, 3 phase or something else. Rule of thumb is that we are allowed 4kW per phase. Bigger connections are allowed by approval from the grid operator (DNO) sometimes - needs to be applied for before commencing works. 2/ East / west arrays offer better power spread, but for your opening hours something more south facing might be better, unless you have electrical items running all day and night like web-servers, window display lights etc etc. 3/ it sounds like it is really worth considering energy saving measures like LED lighting over installing panels 4/ albeit the figures aren't great, you have to consider the energy savings over 20 years (and beyond, the panels don't stop working when the FiT payments stop). Add energy inflation at 5-6% a year and it all looks far more interesting 5/ I'm not a fan of flat roof arrays either, they can be a bit complicated at times, but if you can get some due south panels as a result, then it can work for you? as a sales point, 'going green' can be useful for promoting your business [/QUOTE]
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