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Solar requirements - hydroponic grow lights
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<blockquote data-quote="binky" data-source="post: 459294" data-attributes="member: 490"><p>Hmmm, be careful with batteries, given your long hours it may work for you. I need to do some seriuos reading up on batteries, the oleder units just didn't pay for them selves, so, being the sort of fella that I am, I've never sold or fitted any. What you have to watch is the number of charge cycles which varies with the chemical composition of the battery. Now, this has improved a lot over the last fey years to around 10,000 charge cycles for a battery maker called Sonnen (German). </p><p></p><p>Easy calculation:- number of charge cycles x kw of batteries x electric tariff. so say you pay 15p per kwh and had a 6kW battery, then that is offering £9k (max)saving over its life span. But a 6kW battey can be around £5k fitted, so that's only a £4k saving max. However your system is only likely to charge and discharge once a day, so if you divide £4k by the max daily saving (6kWh x 15p) its going to take 12 years to get your money back. Inflation will reduce that time as energy costs rise, but batteries work better for systems where the load can increase notably several times a day, eg put washing machine on a for a few hours, drain battery, charge it up again and then say cook dinner to flatten it again. That sort of cycle would retun 6 years to pay for itself. Also, given that you are a business you may well be on a higher user tariff like 10 or 11p per kWh, so it reduces the financial benefits further. To me batteries are a nicety for those with surplus cash who hate paying any money to electric companies!</p></blockquote><p></p>
[QUOTE="binky, post: 459294, member: 490"] Hmmm, be careful with batteries, given your long hours it may work for you. I need to do some seriuos reading up on batteries, the oleder units just didn't pay for them selves, so, being the sort of fella that I am, I've never sold or fitted any. What you have to watch is the number of charge cycles which varies with the chemical composition of the battery. Now, this has improved a lot over the last fey years to around 10,000 charge cycles for a battery maker called Sonnen (German). Easy calculation:- number of charge cycles x kw of batteries x electric tariff. so say you pay 15p per kwh and had a 6kW battery, then that is offering £9k (max)saving over its life span. But a 6kW battey can be around £5k fitted, so that's only a £4k saving max. However your system is only likely to charge and discharge once a day, so if you divide £4k by the max daily saving (6kWh x 15p) its going to take 12 years to get your money back. Inflation will reduce that time as energy costs rise, but batteries work better for systems where the load can increase notably several times a day, eg put washing machine on a for a few hours, drain battery, charge it up again and then say cook dinner to flatten it again. That sort of cycle would retun 6 years to pay for itself. Also, given that you are a business you may well be on a higher user tariff like 10 or 11p per kWh, so it reduces the financial benefits further. To me batteries are a nicety for those with surplus cash who hate paying any money to electric companies! [/QUOTE]
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