mk1_man Posted November 15 Share Posted November 15 Hi all, I am currently using Octopus Cosy alongside 10 kWh of battery storage (no solar yet) it means we have been running our heat pump and the rest of the house at 12.72p kWh 24x7 I am currently looking to increase my battery capacity to 20kWh by adding an additional pair of 5kWh rack storage batteries due to an amazing deal of £649 each inc delivery ( https://www.amazon.co.uk/AOLITHIUM-Lithium-Battery-LiFePO4-Lifespan/dp/B0BS9BL6M9/ref=asc_df_B0BS9BL6M9?mcid=2881ba6285a83c6f9a20979621681b40&tag=googshopuk-21&linkCode=df0&hvadid=697230221025&hvpos=&hvnetw=g&hvrand=3251995294949021747&hvpone=&hvptwo=&hvqmt=&hvdev=c&hvdvcmdl=&hvlocint=&hvlocphy=9046567&hvtargid=pla-2198438482546&gad_source=1&th=1 ) I am now considering moving to the Eon NextDrive tariff that offers 00:00 to 07:00 at 6.7p /kWh and running off the batteries for the rest of the day. Just wondering if anyone was doing similar? Link to comment Share on other sites More sharing options...
ReedRichards Posted November 15 Share Posted November 15 Yes. I only have a 6.5 kWh battery but I charge it up overnight, charge my EV and get my heat pump going, including the DHW which I now heat to 55 C to make sure it lasts the day. All this before 07:00. Link to comment Share on other sites More sharing options...
S2D2 Posted Monday at 16:48 Share Posted Monday at 16:48 Which inverter are you using with those batteries? I'm on cosy with a small battery and can't make the sums add up to expand the battery storage with the official batteries. Link to comment Share on other sites More sharing options...
mk1_man Posted Tuesday at 18:08 Author Share Posted Tuesday at 18:08 I am using a 5kWh Sunsynk inverter. I have two Sunsynk batteries with comms to the inverter so charge / discharge is all good. The additional AOLithium batteries I am adding are being added in 'dumb' mode so are only connected electrically in parallel via the +ve & -ve 48v terminals. There is no active comms between them or to the existing Sunsynk batteries. As they are all same 16S architecture they charge and discharge in harmony. £649 ind free delivery and the cables (normally around £50 - £80) is an absolute bargain and too good to resist 🙂 the plan is to charge overnight and run the rest of the day on batteries. Payback circa 2 - 3 years. I have just been looking at the Tomato Lifestyle tariff, this gives 00:00 to 06:00 at 5p /kWh and a couple of other cheap periods a little like Cosy. 1 Link to comment Share on other sites More sharing options...
S2D2 Posted Tuesday at 18:46 Share Posted Tuesday at 18:46 Thanks for the explanation, unfortunately my solax battery is 102V. It's a very good price but I assume my inverter wouldn't be compatible which is a shame, solax batteries are twice the price! The tomato tariff looks interesting but the website errors out when I ask for a quote... Link to comment Share on other sites More sharing options...
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