Battery - to take advantage of 2am to 5am cheap rate electricity - v2

If you're handy at DIY currently that's the cheapest option to go for as I'm sure many folk here will confirm.

And for some shameless advertising, if you want a plug-and-play solution with warranty etc, I'm in the middle of going DIY myself and I will have 4 x B51100 5.12kwh Dyness batteries for sale after, about 1 year old 😉

I wonder how much longer those cheap EV rates are going to last. I am fully expecting "the good" to be taken out of them at some point

1: CapEx cost of kit

2: Lifetime/recharge cycles limit of kit?

2a: discharge rate of battery: eg will it cater for an elec shower at say 9 kW

3: Will battery allow deep discharge: a LI version is about 700-750 euro a kWh

4: 10 kWh/day or 3,650 pa seems a bit light, SEAI indicator is 4,440 IIRC

5: not my area but you must consider losses:

AC to DC to battery, and back

Ah yeah didn't really think of that. I did some quick calculations and think it would be difficult (but not impossible) to run everything off a battery e.g I've a 14kW heat pump and also have one electric shower and electric heaters in an outside room so I'd end up consuming a lot of power some days at 41 cent per unit

Still on the day / night meter but I have a reasonable idea of those bills. I'm going to watch this space closely mind

I think the idea is admirable, but doesn't make sense financially.

You'd be better off taking the 10 to 15k you'd spend on batteries and investing it in the markets.

There's far too many variables associated with load shifting as an economic investment.

That is open to debate. But depending on battery storage sizes you can get large batteries and a storage inverter for far less than 10-15k.

I went the DIY route myself but there are still ready made packs for good prices. Recently fitted a gobel 15kw battery to a family members system. 2700k including delivery and all taxes/duties to your door. It is up ready to go with just the positive negative and can cable to connect. Grand total of about 15 mins setup. Many other options out there too so worth pricing around.

I'd sort of agree with you there Makers, although there's more to it than simply ROI and making money back. A fair chunk of the rationale of me going solar & battery a few years back was that I wanted a way to contribute to decarbonization of my own lifestyle. Part of the reason the suppliers can offer these cheap rates at 3am is that there typically is an abundance of power verses consumers. Makes sense to fill storage be it pumped hydro or batteries when there is abundant power.

Incentivizing people to go/use these rates is a good step. I'm still on D/N, but every month of winter my 8.2Kwhr battery saves about €30-40 by topping up at night and using during the day - but yeah, I'm sure you could equally find some commodity/stock returning similar if not better - but if your "in about the races", I think it's right way to go.

I hear you, but the OP says he's not putting solar in, just wants to load shift to reduce bills.

If you're not going the whole thing DIY, including connection, I dont see it as an economical choice.

No, a DIY cost for batteries was given.

Until the last post, no one mentioned an inverter, or cost of an electrician to safely hook everything up.

I guess you're only interested in your own echo chamber point of view.

Unlikely the OP will save a cent unless he complete DIYs the whole job.

That's the reality,but hey, knock yourself out if uou want to load shift.

Make sure you tell your insurance company that you're DIYing 15 kWhs of batteries from China too!

All the best!