Review: Moixa Solar Battery

by @edent | , , , , , | 4 comments | Read ~833 times.

A few years ago, I took part in a local trial to install a solar battery in our home. The battery was excellent - and made a reasonable difference for our energy use.

Sadly, last year, it died. It was prototype hardware, and these things happen. Moixa offered to replace it with an updated model - which was generous of them. While we were waiting for the new model to come in to stock, we moved house. Then COVID happened...

Anyway, long-story-short, we now have a shiny new 2kWh battery installed!

The batteries came delivered like this:
Batteries in a box.

And were installed in this:

Battery on a wall.

And then wired in like this:

Battery on a wall, wired in.

Then given a slightly less industrial look like this:

Battery with cover.

It has many blinking lights to tell us how it is doing.

Battery leds showing how full it is.

It was a bit of a chore to get installed. We had holes drilled in walls. Then we needed to get our electrics checked. Then it needed to be commissioned. Not helped by various lockdown restrictions. But we got there in the end. Moixa were superb at keeping us informed all the way through the process.

How it works

It's slightly more complex than you may think.

  • Solar power is generated on our roof as DC.
  • An inverter in our loft converts this to AC and pumps it into our consumer unit.
  • If we are using electricity, the solar power flows into our house.
  • If there is surplus solar power, it goes back to the grid. Our SMETS2 smart meter records how much we have exported.
  • A clamp on the tails under the meter records the flow of electricity.
  • If we are exporting, the battery sucks up the energy to store later.
  • If we are importing, the battery pumps out the energy to use immediately.

Phew! Got that?

CONNECT IT TO THE INTERNET!!!!

Every single thing in my home connects to the Internet. EVERY. THING. The battery is no different. This allows for two useful things:

  1. Monitoring of the battery - by myself and Moixa.
  2. Adaptive charging
  3. Being hacked

The monitoring function is available via a website. It shows simple diagrams like this:
Chart showing solar being diverted to the house, battery, and grid.

You can also see more complex minute-by-minute graphs.

I'll write a later blog post about the API and how it can be used.

The adaptive charging is interesting. It can, theoretically, look up the weather forecast to work out when it is optimal to charge and discharge. Similarly, it could work with your energy provider to see when their spot rates for electricity make it worth selling.

I'm with Octopus Energy who do some interesting things with adaptive pricing.

Power Cuts

One important thing to note - home batteries do not help you if your area has a power-cut. If there was a cut, the battery might pump power back into the grid - this would be a risk for any electrician working on the grid.

Cost

The cost of battery storage is high.

  • Initial install: £500
  • Removal of old battery: £175
  • Fitting of new battery: £450
  • Compensation for original battery not working: -£200
  • Cost savings from original battery: -£125

Total: £800

By comparison:

  • Tesla PowerWall costs around £6,000 for 13.5 kWh
  • Duracell costs around £4,500 for 3kWh

More comparisons are on the Which Guide to Solar Batteries.

Is it worth it?

In monetary terms - no. Probably not. Electricity prices are about £0.14 per kWh when purchased from the grid. So the maximum it can store is about £0.28 worth of electricity.

I can sell my surplus solar electricity at about £0.055 per kWh. So the energy I store for later use, I could have sold.

So I "lose" 5p by not selling it, but "gain" 14p by not buying it in. Call it 9p per kWh.

If the battery charged to full every day of the year, it would save us around £100 per year. So a payback period of around a decade. That improves if electricity prices rise.

But it's not (just) about the money. This is an investment in the future. I believe that distributed local energy storage will play a huge part in our future energy mix. I want to make sure that companies like Moixa have customers and that people will see the benefits of home storage.

Our solar panels produce all of the electricity that we use in a typical year. But we can't make use of all of it. Ideally, we'd have a MegaWatt battery which charged all summer long. But, for now, I'm quite happy with this little box whirring away in the corner.

Discounts!

If you buy a Moixa solar battery and mention my name, you'll get a £200 discount - and I'll receive a £200 incentive.

Score!

If you switch to Octopus Energy we both get £50!

4 thoughts on “Review: Moixa Solar Battery

  1. Sam Machin says:

    Small correction, Most home batteries don't help you in a powercut, the Tesla Powerwall does have backup mode if you have the 2nd Gen gateway, which is pretty much all the ones installed in the last 12 mths. It even has something called storm watch where if they see a storm coming and therefore likelyhood of powercuts it will charge the battery to 100%, more use in the USA with their proper storms we very rarely get over here.
    Depending on how you house is wired you can choose to have specfic circuits protected by the battery in a power failure, so perhaps keep the lights and sockets on but don't support the oven and electric shower. A single powerwall can supply a 5kW load.

    1. @edent says:

      True. I think the Moixa has an optional DC out circuit, so you can run lights or charge phones from it. But I honestly can't remember the last time I experienced a power-cut.

  2. Sam says:

    Does the Octopus agile tariff save you any more money? The battery should mean that you never pay the peak time costs and you can top up the battery with cheap overnight power when there is less sun in the winter.

    1. @edent says:

      We've only had the battery a couple of weeks, so it is a bit too early to tell. I don't know whether Octopus and Moixa talk to each other to determine the best rate. But, even if they don't, the battery tends to discharge in line with peak usage anyway. I guess we'll see in a year what difference it has made!

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