Shelly 1 Plus with granny charger

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gfar0023
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Joined: Sat Dec 09, 2023 10:29 am

Post by gfar0023 »

Hi,

In an effort to make my Honda e granny charger smart, I am thinking of installing a Shelly 1 Plus Wi-fi Relay Switch in order to be able to better time my charges remotely (I don't have access to the Honda+ app).

The device is rated for 16A max, and after gathering data on my e charging cycles, I see a steady 9A load during charge (for ~10h). Unless I'm missing something, this technically should work.

Does anyone have any first hand experience with using such relay switch or anything similar?

Thanks in advance :)

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FDAD
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Post by FDAD »

gfar0023 wrote: Sat Dec 09, 2023 10:56 am Hi,

In an effort to make my Honda e granny charger smart, I am thinking of installing a Shelly 1 Plus Wi-fi Relay Switch in order to be able to better time my charges remotely (I don't have access to the Honda+ app).

The device is rated for 16A max, and after gathering data on my e charging cycles, I see a steady 9A load during charge (for ~10h). Unless I'm missing something, this technically should work.

Does anyone have any first hand experience with using such relay switch or anything similar?

Thanks in advance :)
The original granny charger uses 2,5kW and the 16A are rated for 3,8kW it should be good.
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madbiker
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Post by madbiker »

I’ve setup LightwaveRF switches and sockets in my home and with its Hub and App I can control these items with device automations, so you could use one of these sockets where you normally plug-in the granny charger and set it to turn on and off as and when needed.
With their latest Link Plus hub you will also see how much power you’ve used for each switch or socket, great to see which products are consuming the most.
There are obviously other makes of this type of home control automation.
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EEEE
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Post by EEEE »

I would say you are fine.

Given that the charger is not a dumb power supply, the load does not turn on immediately. There is a power up, a check/Comms with the car and then it draws the power. That means the remote switch is not switching a massive inductive load which would quickly burn through the relay.

You can set the schedule in the car. I can't imagine needing to change the schedule remotely when using such a slow method to charge?
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londiniumperson
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Post by londiniumperson »

FDAD wrote: Sat Dec 09, 2023 1:13 pm The original granny charger uses 2,5kW and the 16A are rated for 3,8kW it should be good.
Are you sure it is 2.5kW, I thought that it was even lower?
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londiniumperson
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Post by londiniumperson »

I used a TP Link smart plug for a few weeks whilst I waited for a 7kW wall charger and had no issues.
The granny charger has a temperature sensor in the plug so it will cut the power in the event of over heating and will auto reset when it cools down.
2020 Advance in Crystal Black Pearl on 17's - 08/2020-Current
2015 VW Tiguan (Pure White) - 04/2018-Current
1991 Honda Beat PP1 (Festival Red) - 11/2022-Current
gfar0023
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Joined: Sat Dec 09, 2023 10:29 am

Post by gfar0023 »

Awesome! Thanks all for your replies :)
flameshretoos
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Joined: Wed Dec 13, 2023 8:49 pm

Post by flameshretoos »

Firstly, it's crucial to ensure that any device you use is compatible with your EV and complies with safety standards. If driver's licenses were that easy too, I'd be happy, although as an option you can use real id oregon guys who can do a lot. The Shelly 1 Plus, being rated for 16A, seems suitable for your described 9A charging load. However, it's always a good idea to have some margin for safety.
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