Anyone want to share costs on batteries?
I am looking at beefing up my battery storage as the ASHP loves power, my solar is big and I have a cheaper overnight tariff.
I've been reviewing batteries and settled on the Seplos Pusung 5kw batteries - https://www.seplos.com/sale-14177418-pusung-s-stackable-household-lithium-48v-100ah-lifepo4-10kwh-off-grid-3kwh-5kw-battery-power-home-so.html
They are LiFePO4, so very stable, they have good storage, 5kw and they can charge/discharge at 100A@51v so 5kw peak in and out. They are also stackable, so I could get 2 and have 10kw etc.
I've also spoken to them and they've told me its $2100 (£1500) per unit for 1, $1800 (£1325) per unit for 6, and $1200 (£900) per unit for 12 plus $350 USD shipping per battery to the UK. If I get them in a big order, it works out very reasonable from a good supplier. I will also need a 5kw hybrid inverter, and this will be £600-£1000
My question is... is anyone else thinking about batteries? If you are, would you consider a bulk order to lower the costs? Using Octopus Go, I could realistically charge 20kW overnight at 5p/kW
One thing to note would be if Octopus goes under or removes the Go tariff you would be left with a system that would only really work in summer provided you can fill all the batteries with excess solar and have expensive batteries doing nothing in winter.
Mitsubishi Ecodan 14kw ASHP + 500l Cylinder
@george there are plenty of other time of day tariffs and EV tariffs from many major firms. Currently my 14kw batteries provide 32% of all my power use. If you can buy them at the right price they make better financial sense than solar panels - which only work when the sun shines and if you don't use the power you give it away to the network operator
I’ve been seriously looking at battery storage, had a quote for Huawei 10kw and 19 405w panels at £14k. Just about to point out to the solar company that the panels won’t fit. There is a market for a decent national solar company.
what inverter are you planning on using?
@mattengineer I've got a Sofar 3000 however that only charges/discharges at 3kw. Ideally I'd like 5kw to take full advantage. Then I'd have 8kw peak capacity. Also if I went 25kw I'd only get 20kw of storage at 80% DoD so I'd need 5kw to fill it at 5p octopus go
@batalto Are you able to parallel two sofar inverters? Giv energy ac coupled inverters can be paralleled (up to 3) but the ramp up of house loads takes a while (c15 secs) so you’re still drawing off the grid.
I’ve got two 80 amp supplies(in phase) coming in to the house, annoyingly western power wanted over £10k to upgrade to full 3 phase which would have been great for inverter choice and ev chargers etc. That could be 4 hours at 80a x 240v could be 153.6kw just need some grid scale batteries. (Wonder if they sell them 2nd hand).
@mattengineer yes from what I've seen you can have up to 3 in parallel.
You would 100% need grid scale batteries. Most inverters take batteries up to 52v at 100A (so 5kw). However they are usually limited less. It's all about the wire sizes as you would know as well as other things.
I looked at 3 phase - they wanted £5k to bring it across the road. Should have bought a house on the other side!
@batalto Curious western power gave me a similar explanation (excuse) that they would need to upgrade the whole ABC from the transfer on the other side of the road.
If I had the time I would build a 16 prismatic cells (280ah) in series to give a 51.2v nominal battery c11.5kw at 80% depth of discharge.
@mattengineer all those batteries are basically exactly that. Just in a nice box with a BMS attached. Pretty sure Seplos actually sell a DIY kit
https://seplos.com/sale-14412229-meka-25-6v-135ah-3456wh-lifepo4-battery-diy-kits.html
@mattengineer not for the DIY ones. However I assume it's pretty similar given the weight. $350 per unit and 2-4 weeks in shipping. Could be more now
This is interesting as an alternative to battery storage and potentially cheaper in overall cost.
https://www.ovoenergy.com/guides/electric-cars/vehicle-to-grid-technology
- 24 Forums
- 1,413 Topics
- 29.7 K Posts
- 16 Online
- 1,199 Members
Join Us!
Latest Posts
-
RE: Gas Combi to ASHP - Making sense of survey results and proposal.
@irmartini Hi, Why not lower your gas boiler flow temp ...
By JEH , 3 hours ago
-
In an ideal world a heat pump unit would contain two co...
By Derek M , 5 hours ago
-
RE: ASHP Advice: High Temperature vs. Low Temperature Heat Pump For Microbore
@jamespa I fully agree with James that a HT heat pump...
By Derek M , 6 hours ago
-
RE: Installing your own ASHP - DIY
@tomasmcguinness Have you been able to perform any sani...
By IanMK13 , 10 hours ago
-
-
RE: Viessmann Vitocal 250-A in the UK
For reference, I have a 10 kWh Viessmann 151-A installe...
By GC61 , 12 hours ago
-
RE: Vaillant Arotherm Settings for New Installation
@drew-pa Ah thanks. Good to know I dont have a misconce...
By bontwoody , 13 hours ago
-
RE: Aira Heat Pump: Stylish Scandinavian Heating
On the whole marketing claims vs reality on performance...
By GunboatDiplomat , 13 hours ago
-
RE: Microbore Central Heating Plumbing, will it be a barrier / pain?
@mattc All the existing (designed for T50) radiators ar...
By IanMK13 , 1 day ago
-
The temporary fix has reconnected about 60% of users, a...
By Abernyte , 1 day ago
-
RE: What is Wrong with our Heat Pump Installation?
Having to run the heat pump during the summer for DHW s...
By Toodles , 1 day ago
-
Issues with Vaillant connectivity via the MyCONNECT gateway
I'm sensing a variety of issues with Vaillant connectiv...
By dr_dongle , 1 day ago
-
Interesting heat pumps installations
Thought it would be cool to share photos of interesting...
By Mars , 1 day ago
-
RE: Say hello and introduce yourself
@Toodles That's very interesting to hear, thanks. I ha...
By dr_dongle , 1 day ago
-
RE: Massive Electricity Cost for Running My Air Source Heat Pump
@allyfish In fairness installer has replied stra...
By Holts , 2 days ago
-
-
RE: Are Solar Diverters Necessary for Homes with ASHPs and Solar PV?
@zzxap19 that's a fair point. With the eddi, is it poss...
By Mars , 3 days ago
-
RE: Delivering a smart and secure electricity system: government consultation
"I don't think I'll need to refer to past iterations of...
By eggnchips , 3 days ago
-
RE: Error on Immersun – Error 8 Load Short Circuit
@julesmp8 fingers crossed. I have to say our Immersu...
By Mars , 3 days ago
-
Latest Topics
-
Interesting heat pumps installations
By Mars 1 day ago
-
What is Wrong with our Heat Pump Installation?
By Mars 2 days ago
-
Fossil Fuel Fired Heating v Heat Pump?
By Toodles 2 days ago
-
Viessmann Vitocal 250-A in the UK
By treehugger 4 days ago
-
By HUBB84 6 days ago
-
By jswhite 7 days ago