Page 2 of Energy crisis

@rjs - have you factored in batteries to your solar PV ROI?

I posted the below in another forum when I was deciding.

In the end, I've ended up getting Solar PV as well as a battery as it wasn't much more.

I use 558.0kWh per month or ~19kWh per day. At 16.1p a unit that's ~£90 a month. When that jumps to ~31p a unit I'm looking at ~£173 a month. If I get an 18kW battery, and charge it at 7.5p a unit, that's ~25% of what I'm paying peak rate so ~£43.25 a month. That's a theoretical saving of ~£129.75 a month, ~£1557 a year. I'd like to think that ROI could be recouped in 5 years. I've seen a complete 16.4KW GivEnergy kit for £6138 inc VAT. That's a 10 year warranty and 6000 cycle discharge which is ~16 years if you fully charge/discharge once a day.

For me, taking the green/carbon aspect away, battery storage seems to be the most efficient way of getting a ROI.

Hmm that's interesting! I will have to explore that!

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An extra note regarding the 0% VAT. If you install a battery system at the same time as the solar PV (so have it done as all one system), then the battery system is also 0% VAT.

This item was edited on Monday, 25th April 2022, 23:24

12x Hyundai 410W panels (25yr product & efficiency warranty!)
12x Tigo optimisers
LUX 5kW Inverter
12kW Storage
Comes in at £10,150 installed.

This is what I've paid for. Did quite a bit of research and think I've got a very fair price.

This item was edited on Wednesday, 27th April 2022, 08:30

I assume 410W, not kW?

Ste

Quote:
r8sso says...
"Comes in at £10,150 installed."
Is this motivated by purely environmental and self sufficiency or do you expect it to have paid for itself one day?


Snaps

You assume correct. Typo.

It wasn't a green decision Snaps. I've posted my calcs above on consumption / costs. Even without factoring in the free energy the PV panels create, if I just charge the batteries each night on an off peak EV tariff like Octopus Go then my bill will be 25% of paying peak rate (7.5p instead of 31p unit)

7 years I think I'll break even if energy prices remain the same. Sooner if you factor in the panels will make ~4000kW a year. I'm also hoping to look into using the emersion heater for hot water when I have excess, reduce my gas usage down.

I had PV Solar with Batteries fitted end of May 2021... my average duel fuel was £130 p/month, in January my supplier changed this to £50 p/month, as my electricity from grid had dwindled to less than 20% or previous 12 months.

My current monitor states I should receive £820 for past year for electricity exported to the grid (assuming the App has correct £/p value) - am just awaiting the first payment (April 2022).

Will then see how accurate it is...

System was £6200 fitted I estimated 10 year to pay for itself, given the rise in fuel costs, and if accurate the payment from grid, it will likely halve that... only wish is that I had installed two more batteries, and not exported anything to the grid, as clearly you pay more for what you buy, than what is given for that exported.

Can you add extra capacity to the battery system?