Independence from power cuts

Majordennisbloodnok · 2022-03-02T16:48:50Z

I have, as I have previously detailed, a solar PV array, a battery and an inverter. I also now have an export tariff with Octopus so that excess production can at least earn us some money. Currently, however, we are still without power in the event of a power cut. My ideal would be for a setup that would allow us to continue exporting excess, but also to continue using solar produced electricity and any battery-stored electricity in the event of a power cut. We've been told this is not practical, but I'm an electricity luddite. Could anyone give me a fairly simple explanation as to why what seems simple is in fact rather more involved? Much appreciated.

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batalto

(@batalto)

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Posts: 1091

11/03/2022 6:11 pm

@derek-m that's true, but you no matter the battery size you will be limited to 3kw of power at peak - 16amp in EPS mode.

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.

12kW Midea ASHP - 8.4kw solar - 29kWh batteries
262m2 house in Hampshire
Current weather compensation: 47@-2 and 31@17
My current performance can be found - HERE
Heat pump calculator spreadsheet - HERE

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Derek M

(@derek-m)

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11/03/2022 7:37 pm

Posted by: @ken

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.

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Kev M

(@kev-m)

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12/03/2022 8:16 pm

Posted by: @batalto

@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