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
- 26 Forums
- 2,183 Topics
- 48.1 K Posts
- 44 Online
- 5,756 Members
Join Us!
Podcast Picks
Latest Posts
-
RE: Large heat pump options for church building
I should think that a heat loss calculation might be a ...
By Toodles , 12 minutes ago
-
RE: Do I just go with the lowest quote for my heat pump?
@jamespa This is a very wise procedure to adhere to to ...
By Toodles , 23 minutes ago
-
RE: Say hello and introduce yourself
I've started a topic in the Heating Alternatives sub-fo...
By wully , 2 hours ago
-
-
@toodles Im trying my best but it is getting a tad tedi...
By bontwoody , 2 hours ago
-
RE: Samsung Gen 6 - Schedules not working
@old_scientist thanks for trying. I do have a copy of t...
By bontwoody , 4 hours ago
-
RE: Seal the Deal: Don't Let Your Heat Pump Leak Energy
Indeed. If the primaries are not big enough to carry th...
By Old_Scientist , 6 hours ago
-
RE: DNO export limit problems.
How big is your proposed solar array? I have 7.2kWp a...
By Old_Scientist , 6 hours ago
-
RE: Clivet ASHPs and weather compensation
It sounds like weather comp may not be activated. Give ...
By Simon Wardle , 8 hours ago
-
RE: Which thermostat should I get (or do I need one?)
OK I've thought some more about this. I think you have...
By JamesPa , 11 hours ago
-
RE: Help me keep the faith with my air source heat pump installation
I just looked at mine. My flexis (which run horizontal...
By JamesPa , 11 hours ago
-
RE: Air source heat pump roll call – what heat pump brand and model do you have?
Manufacturer: Vaillant Model: Arotherm Plus 7kW Typ...
By MatWin , 21 hours ago
-
@papahuhu Sounds as though you need to speak to your in...
By Toodles , 1 day ago
-
RE: Flexi-Orb Heat Pump Scheme: A Game-Changer for the UK's Heat Pump Industry
Signed.
By Morgan , 1 day ago
-
I ‘did the math’ for Nov. to the end of April to be on ...
By Toodles , 1 day ago
-
RE: Testing new controls/monitoring for Midea Clone ASHP
@tasos automations on Home Assistant so if there is a p...
By benson , 1 day ago
-
RE: Sizing - Save me from my headache
Mitsi 8kW has a 6kW variable and 2kW fixed compressor s...
By JamesPa , 2 days ago
-
@drei your proposed radiator design looks inadequate to...
By GrahamF , 2 days ago
-
RE: Why does an ASHP provide a more comfortable environment than a gas boiler?
Actually, I think the issue is the different rate of he...
By AndrewJ , 2 days ago