@oscarmax thanks for the info. No the battery price is for the unit only so invertor anf fitting still to be added plus whatever rlse they need to fit it. I am assuming the £6,000 is including VAT but doesn’t say on their website so ? circa £4800 for 30kwh battery is pretty good. I intend to buy, whichever battery I go for, my self, and just ask for a price to fit it. I’m trying to shame the electrician into giving me a price that reflects the work required. From what I can gather it’s a days work for one guy, with the exception of lifting the battery. I am hoping I can help in that regard and get the wife to help him?. I’m assuming it is a basic invertor I need rather than a solar invertor? Let’s say I get the battery and installation for £6,500 I am looking at 5/6 years to repay itself at today’s electrical prices. I’m I right in saying the battery can be charged overnight @ 9p per kwh and then sold back during the day for 15p per kwh. I also have an existing 3.6 kwh solar install that I get a feed-in tariff from. At present I get 5p, roughly, for an assumed 50% of my solar output being returned to the grid what happens to this if I redirect all my solar to the battery, or agree a deal with Octopus energy to sell it to them as part of the 15p per keh deal? Doesn’t seem right that I get paid for it twice.
Even with the SolaX battery I generate approximately just over 4000 kWh and export approximately 3000 kWh so I am actual exporting 75% back to the grid, so you should be fine.
Import 3000 kWh @ 10/12 pence + standing charge
Export 3000 kWh @ 15 pence.
At 9 pence a kWh on Octopus Go (4 hours off peak) you could charge up your PHEV estimate 1500/1800 kWh and charge up your battery, mine charges at 3.7/3.8 ish kWh so approximately approximately 15 kWh, so in theory you will never need to pay the high day rate with a 30 kWh battery. Here is the best bit, with Octopus you can still keep your FiT tariff. So basically you tick all the boxes.
As this is a retro fit you will retain you existing solar inverter, you will have a AC inverter to charge you battery from the mains and excess solar. The marine industry use Victron inverters I have one in the caravan its is both efficient and bulletproof, Victron have there own forum.
If I was to start all over again Victron AC inverter and Foster 30 kWh battery
Unfortunately I have suffered a brain injury and occasionally I get confused and often say the wrong thing.