Solar Together and retrofit batteries

1961Nick

70sbudgie said:

1961Nick said:

70sbudgie said:

Thank you for the comments above.

I'm still not sure if the design is right for me, but I guess I might have to compromise somewhere - either design or cost.

So I would appreciate some advice on the cost of retrofit battery installations, if possible.

The Solar Together quote is offering a 3kW (AC nominal power) Growatt inverter with 3x 3.3kWhr Growatt batteries for £7,020 (Inc VAT).

I have been able to get a standard quote from the my energi website for a 5kW inverter with 2x5kWhr batteries for £11,102 (Inc VAT). (The smaller inverter is less than £100 cheaper). (I haven't been able to find anything that indicates the charge / discharge power for the Libbi is different to the headline figure)

Are you able to advise on the relative qualities of the two manufacturers and whether the Solar Together quote is reasonable for current prices? The installer is called Grant Store - does anyone know / have experience of this installer?

For a 10kWh AC coupled HESS you should be looking at £5000 - £7000. If you pay excessively over that amount the ROI will be well over 10 years. Here's an example of what's available for £7K (not a recommendation btw)...

https://www.pluginsolar.co.uk/?product=givenergy-all-in-one-6kw-ac-charger-and-13-5kwh-battery-with-100-dod-with-gateway-for-eps-backup

Thanks.

What sort of installation costs would you expect with that GivEnergy set up? Both my quotes above include installation and VAT (the GivEnergy appears to exclude installation). So GivEnergy could potentially be on par with the My Energi quote, though it has a much larger capacity than the GroWatt I've been offered and is more expensive. 

An AC coupled system installed near to your consumer unit should cost no more than £500 in labour.

(I reckon I could fit it in 2 hours + another 2 hours for testing & commissioning.)

70sbudgie

1961Nick said:

70sbudgie said:

1961Nick said:

70sbudgie said:

Thank you for the comments above.

I'm still not sure if the design is right for me, but I guess I might have to compromise somewhere - either design or cost.

So I would appreciate some advice on the cost of retrofit battery installations, if possible.

The Solar Together quote is offering a 3kW (AC nominal power) Growatt inverter with 3x 3.3kWhr Growatt batteries for £7,020 (Inc VAT).

I have been able to get a standard quote from the my energi website for a 5kW inverter with 2x5kWhr batteries for £11,102 (Inc VAT). (The smaller inverter is less than £100 cheaper). (I haven't been able to find anything that indicates the charge / discharge power for the Libbi is different to the headline figure)

Are you able to advise on the relative qualities of the two manufacturers and whether the Solar Together quote is reasonable for current prices? The installer is called Grant Store - does anyone know / have experience of this installer?

For a 10kWh AC coupled HESS you should be looking at £5000 - £7000. If you pay excessively over that amount the ROI will be well over 10 years. Here's an example of what's available for £7K (not a recommendation btw)...

https://www.pluginsolar.co.uk/?product=givenergy-all-in-one-6kw-ac-charger-and-13-5kwh-battery-with-100-dod-with-gateway-for-eps-backup

Thanks.

What sort of installation costs would you expect with that GivEnergy set up? Both my quotes above include installation and VAT (the GivEnergy appears to exclude installation). So GivEnergy could potentially be on par with the My Energi quote, though it has a much larger capacity than the GroWatt I've been offered and is more expensive. 

An AC coupled system installed near to your consumer unit should cost no more than £500 in labour.

(I reckon I could fit it in 2 hours + another 2 hours for testing & commissioning.)

That seems extraordinarily good value compared to everything I have found so far. Where do you operate and does that allow for DNO application? 

1961Nick

70sbudgie said:

1961Nick said:

70sbudgie said:

1961Nick said:

70sbudgie said:

Thank you for the comments above.

I'm still not sure if the design is right for me, but I guess I might have to compromise somewhere - either design or cost.

So I would appreciate some advice on the cost of retrofit battery installations, if possible.

The Solar Together quote is offering a 3kW (AC nominal power) Growatt inverter with 3x 3.3kWhr Growatt batteries for £7,020 (Inc VAT).

I have been able to get a standard quote from the my energi website for a 5kW inverter with 2x5kWhr batteries for £11,102 (Inc VAT). (The smaller inverter is less than £100 cheaper). (I haven't been able to find anything that indicates the charge / discharge power for the Libbi is different to the headline figure)

Are you able to advise on the relative qualities of the two manufacturers and whether the Solar Together quote is reasonable for current prices? The installer is called Grant Store - does anyone know / have experience of this installer?

For a 10kWh AC coupled HESS you should be looking at £5000 - £7000. If you pay excessively over that amount the ROI will be well over 10 years. Here's an example of what's available for £7K (not a recommendation btw)...

https://www.pluginsolar.co.uk/?product=givenergy-all-in-one-6kw-ac-charger-and-13-5kwh-battery-with-100-dod-with-gateway-for-eps-backup

Thanks.

What sort of installation costs would you expect with that GivEnergy set up? Both my quotes above include installation and VAT (the GivEnergy appears to exclude installation). So GivEnergy could potentially be on par with the My Energi quote, though it has a much larger capacity than the GroWatt I've been offered and is more expensive. 

An AC coupled system installed near to your consumer unit should cost no more than £500 in labour.

(I reckon I could fit it in 2 hours + another 2 hours for testing & commissioning.)

That seems extraordinarily good value compared to everything I have found so far. Where do you operate and does that allow for DNO application? 

I don't 'operate' ... but I have installed batteries & an inverter & it took me 2 hours to fit the hardware & wire it. Getting the dongle working & doing the electrical testing (new circuit) took another couple of hours. The DNO application is quite straightforward & there's nothing to stop you doing that yourself. Best to choose an inverter with export limitation capability so you can restrict export to G98 (16A) if required.

QrizB

I'd agree that, with the equipment onsite, it should be possible to install and commission a domestic BESS in half a day.

I did mine peacemeal over the best part of a year, but that's because it's a bitsa system - a bit of this, a bit of that ...

70sbudgie

Don't batteries have to be installed by an MSC (or equivalent) approved installer to be signed off by the DNO? As with micro generation?

I'm hoping to get G99 approval (rather than G98) and actually the G99 application is the bit that worries me the least!

1961Nick

70sbudgie said:

Don't batteries have to be installed by an MSC (or equivalent) approved installer to be signed off by the DNO? As with micro generation?

I'm hoping to get G99 approval (rather than G98) and actually the G99 application is the bit that worries me the least!

You just need a Sparky to install the battery, test the circuit & issue a compliance certificate. There is no obligation to use an MCS registered electrician.