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FIT 3Kwp System from 2014. Should I be adding batteries?
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<blockquote data-quote="Oldman22" data-source="post: 539203" data-attributes="member: 36003"><p>Brains awash now with data.</p><p>I'm trying to collect data together to check what size battery store system I should aim for.</p><p></p><p>My Smart meter csv data dump tells me I used 2441kwh in 2021-22 & 2086kwh in 2022-23</p><p></p><p>49% of my daily usage is after 4pm with a surge around 5-7pm cooking, my unit cost is 35p</p><p></p><p>Daily gross consumption looks to be between 11kwh and 14kwh with the odd 21kwh (xmas day) </p><p></p><p>Solar generates around 15kwh up to 21kwh daily in sunny summer months with a lot being exported unused for peanuts.</p><p></p><p>I don't yet have an energy supplier who offers low rate overnight electricity to charge batteries but I guess there will be no problem changing to one who does offer this once I have a system that needs the low tariff. </p><p></p><p>So its looking to me like 10 to 14kwh battery pack and fast charge 5 or 6kw AC coupled inverter should with summer pv see me mostly grid free except for battery charging.</p><p></p><p>As to payback period I aim to spend no more than £5k. My current solar exports are worth £650/yr in battery charging mode. The grid use assuming my solar continues to perform is worth around £850/yr if I can use battery instead.</p><p>This works out at 3.3yrs to payback the cost of the kit assuming 5k max.</p><p></p><p>At the end of last summer I installed an 18k btu split aircon unit with heat pump, I've not had much chance to use it yet but that will tax my energy saving!</p><p></p><p>So am I on the right track so far?</p></blockquote><p></p>
[QUOTE="Oldman22, post: 539203, member: 36003"] Brains awash now with data. I'm trying to collect data together to check what size battery store system I should aim for. My Smart meter csv data dump tells me I used 2441kwh in 2021-22 & 2086kwh in 2022-23 49% of my daily usage is after 4pm with a surge around 5-7pm cooking, my unit cost is 35p Daily gross consumption looks to be between 11kwh and 14kwh with the odd 21kwh (xmas day) Solar generates around 15kwh up to 21kwh daily in sunny summer months with a lot being exported unused for peanuts. I don't yet have an energy supplier who offers low rate overnight electricity to charge batteries but I guess there will be no problem changing to one who does offer this once I have a system that needs the low tariff. So its looking to me like 10 to 14kwh battery pack and fast charge 5 or 6kw AC coupled inverter should with summer pv see me mostly grid free except for battery charging. As to payback period I aim to spend no more than £5k. My current solar exports are worth £650/yr in battery charging mode. The grid use assuming my solar continues to perform is worth around £850/yr if I can use battery instead. This works out at 3.3yrs to payback the cost of the kit assuming 5k max. At the end of last summer I installed an 18k btu split aircon unit with heat pump, I've not had much chance to use it yet but that will tax my energy saving! So am I on the right track so far? [/QUOTE]
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FIT 3Kwp System from 2014. Should I be adding batteries?
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