@kev-m Inverter is an inverter - so pop it on the wall. The batteries are 440 x 750 x 270 and you've probably stack two on top of each other or place them facing upwards.

You obviously need the batteries next to the inverter - so you'd need a cupboard sized space and you'd put the batteries on the floor. 

This is my battery setup - I've since tidied up those earth leads

Would be a garage job for me, lots of space there and dry.  Thanks.

I'm no sparky but I'd have thought 16A would be sufficient to cover the inrush current for a well pump, that 3500W isn't it? 

Hi Ken,

If it is just important to run your well pump, you may wish to have a look at the equipment available at the UPS Centre.

The goodwe inverter also has an EPS switch, but the battery discharge is 5kw Vs 3kw. Therefore I would personally explore a different brand, get more power and more battery capacity for less money.

As I keep saying, all these batteries are the same inside - you are paying for the name/branding.

@derek-m that would make it 3kw then - so the same as most other inverters.

If you wanted something beefier I might suggest the GoodWe GW5000S-BP - HERE - That will do maximum output of 5kw - £1,700

Then you could get a MASON Kit (or two) - HERE - $1000 + shipping, lets say $1200 (£900) for two of them - This is a box with battery system to hold the cells

and the cells - HERE - 32 cells for £4000 delivered

That's 30kwh of battery storage at a maximum discharge of 5kw for £6,600 + Install costs (£1,000)

Yes there is a small amount of DIY in making up the battery kits with the cells, but beyond that you are getting double the capacity for less money. If I was starting again I would 100% go down this route as almost all LiFePo4 batteries are the same inside; they are all just tarted up with branding.

Hi Batalto,

I obviously did not make myself clear. During a power cut it would be possible to supply selected equipment (not the full house) using what SMA describe as a Secure Power Supply via an Emergency Power Outlet, which is isolated from the main electrical circuits and the grid supply. The inverter is also disconnect from the grid supply and the main electrical circuits. It does not state clearly, but it may be possible to maintain a connection to a solar PV system and hence use any available solar power.

On loss of grid supply it would be necessary to enable the system by operating a switch, and then switch back to normal supply when the grid power has been restored.

There are three sizes of Sunny Boy Storage systems available, with maximum output power of 3680W, 5000W and 6000W, and I believe that batteries of capacity up to 24kWh can be connected.

Whilst I have an SMA inverter, that was supplied with my solar PV system, and has worked perfectly for the past 10 years, I have no actual involvement with SMA or any of its distributors. My original post was in answer to Mars, who was having difficulty finding any installer who could provide a system that would continue to operate during a power cut. Also to answer, I think it was, Ken's query about a limited power supply to certain equipment during a power cut.