Competitor to Tesla Powerwall

[Sidicks]

Does anyone have any experience or information about the new Myenergi battery storage system?

https://myenergi.com/libbi/

We had been moving towards a Tesla Powerwall battery storage solution, however these aren’t cheap and availability is very limited - likely to be a long wait.

We will be installing the Zappi 22Kw charger, so this new system should integrate well with that.

Any thoughts?

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[Midlifecrisis]

Looks expensive. There isn’t much info on the website without registering but it looks like £5k+VAT for 5kWh storage. Or maybe that is the price for a whole system. I can’t seem to tell.

I have a Giv energy system on order (supposed to be installed at the end of January) which is cheaper. I can’t remember the quoted price and it is part of a solar installation but I think the batteries are more like 9.5kWh each at maybe £4k each. I seem to have waited for ever to get it though… like a Taycan. I hope it comes on the planned install date

 

[Sidicks]

Looks expensive. There isn’t much info on the website without registering but it looks like £5k+VAT for 5kWh storage. Or maybe that is the price for a whole system. I can’t seem to tell.

I have a Giv energy system on order (supposed to be installed at the end of January) which is cheaper. I can’t remember the quoted price and it is part of a solar installation but I think the batteries are more like 9.5kWh each at maybe £4k each. I seem to have waited for ever to get it though… like a Taycan. I hope it comes on the planned install date

The quote I had for a Tesla Powerwall (£13.5kw) was £12,500 +vat, this was in addition to the costs of the solar panel installation etc.

So it’s a very similar ballpark. I’ve no Idea if your system has the same ‘back up’ and other functionality as the Powerwall or Myenergi system.

 

[Dabz]

I have 2 Givenergy batteries, very happy with them. Paid about £1050 for each but they’re only 2.6kW ones and wish I’d opted for more. Even during December we’ve filled them and ended up exporting on certain days

 

[Sidicks]

I have 2 Givenergy batteries, very happy with them. Paid about £1050 for each but they’re only 2.6kW ones and wish I’d opted for more. Even during December we’ve filled them and ended up exporting on certain days

Thanks - can you power your house (or part of it) in the event of a power cut?

 

[Dabz]

Thanks - can you power your house (or part of it) in the event of a power cut?

we can’t no, I think there’s an extra bit to the system needed for that which we didn’t opt for. Having lived with the system for a while now, it would need to be a very well-timed outage to correspond to having enough battery charge to continue anyway. In summer it would be fine as our battery is almost always at 100%, but would be of no use during winter

 

[Midlifecrisis]

I think you can opt to have a circuit on the backup, but to my mind that is a flawed idea. The whole point of the batteries is that you use the power in them and discharge them. To have a useful backup you need to keep it fully or partially charged. It might be useful if you happen to have a power cut while you have remaining charge, but it is a bit hit and miss and no one explains this point. I did hear of someone who was using a power wall as a UPS but it was fully discharged when there was a power cut and therefore didn’t work

 

[McgR]

I have a 14 kWh home battery and 10 KwP PV panels since September . In October I had 60 % use of my consumption covered by PV directly or battery. I produced more than my use but 40% still went to the grid and I had to buy it back at a higher price. I al considering buying an extra module.

Some things to consider:

The battery usually can only handel 5 Kw the inverter can handle 10 Kw max.

14 kwh isn’t a lot if you need to charge the battery. And you still want SoC for the house hold.

i have set my Wallbox to the lowest possible power setting and this is around 5 Kw. If I set it higher, during the day it wouldn’t charge the home battery.

if I set my car to be charged 85% at 6h00 usually my battery is empty too when the car is charged. And I would prefer to that for the expensive energy rate until my PV panels start to produce again. My battery / inverter doesn’t have a timer setting unfortunately when it can use the battery or not. Might be useful only to use the battery during Peek hours.

Wallbox has a green setting only to use spare energy from the PV panels. It could work in summer but the car needs to be home of course. Charging during weekend will probably be enough for me.

the battery and inverter need power from the grid to work. If you want to be able to use when the electrical grid is off you need a special module.

 

[McgR]

I think you can opt to have a circuit on the backup, but to my mind that is a flawed idea. The whole point of the batteries is that you use the power in them and discharge them. To have a useful backup you need to keep it fully or partially charged. It might be useful if you happen to have a power cut while you have remaining charge, but it is a bit hit and miss and no one explains this point. I did hear of someone who was using a power wall as a UPS but it was fully discharged when there was a power cut and therefore didn’t work

That is a very good point.

a possible solution could be vehicle to grid. The car batteryis big enough to cover a couple of days and you could drive somewhere to charge it if it’s cloudy for some days.

 

[kempez]

I have 10kW Growatt system with a 3kW inverter and ~6.5kW panels. We’ve a PodPoint. Currently we charge the batteries on grid power (winter they tend to discharge fully before eod), during our cheap tariff and we charge the car at the same time. In summer the battery gets charged in the day and the cars will continue to charge in the night, with the batteries kept above 40% (from grid as necessary), so we have power for the morning before the light starts hitting the panels.

The daytime tariffs are currently so ridiculous that this is the best and cheapest strategy. The panels hugely over-produce in summer, and autumn and spring vary but winter unless it’s a very bright day, they don’t produce loads.

 

[4MBN]

Thanks - can you power your house (or part of it) in the event of a power cut?

You need to add an EPS to your system for this. Make sure you ask your installer about it.

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