Thinking of Designing a Solar Management System

fopoku2k2

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I have successfully gone off grid. Fortunately i seem to have oversized my system. Batteries are fully charged by 11am. Sun last till 5pm on most days

I am thinking of designing an automatic system that would power on my air-conditioning when the batteries are fully charged. Anyone with knowledge of such a system or advice?
 

svetz

Works in theory! Practice? That's something else
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Congratulations!

I don't know of anything COTS, but you could use something to monitor your SoC and then flip a relay to turn the AC thermostat from off to on (see the IoT). Here's another thread talking about similar things.
 

houseofancients

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depending on your inverter, you could use home assistant , mqqt and sonoff switches and a heavy duty relay/contacter to switch your waterheater on.

i've been experimenting with a 200l pre heater.
in summer , it provided all the hot water we needed, in winter it kept my heating bill from the water heater considerably lower.

i would assume ac would work the same
 

fopoku2k2

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depending on your inverter, you could use home assistant , mqqt and sonoff switches and a heavy duty relay/contacter to switch your waterheater on.

i've been experimenting with a 200l pre heater.
in summer , it provided all the hot water we needed, in winter it kept my heating bill from the water heater considerably lower.

i would assume ac would work the same
I am using a Growatt inverter. Can you guide me through how you did you installation
 

houseofancients

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I am using a Growatt inverter. Can you guide me through how you did you installation
not familiar with growatts.
you need to get your incomming solar in to a raspberry pi and into home assistant.

i use a second raspberry pi, connect with a serial cable to my inverter.
that second raspberry sends detail about incomming solar and my battery's SOC to my home assistant raspberry using MQTT.

i then put logic on both ( SOC > 90 and incomming solar > 2000 watts ) -> enable sonoff that controls power to water heater 1
if temp water heater => 65 celcius , shut down water heater
if temp pre heat tank < 65 enable heating element

this is using hass.io , node-red and mqtt
 

fopoku2k2

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idea was based of what daniel has done on his YT channel DIY Tech and Repairs

Wow!! Thanks for this. But unfortunately Daniel doesn't show the basics.

Any idea where I can start from the basics like how to set up MQQT server etc?
 

fopoku2k2

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Aug 20, 2020
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not familiar with growatts.
you need to get your incomming solar in to a raspberry pi and into home assistant.

i use a second raspberry pi, connect with a serial cable to my inverter.
that second raspberry sends detail about incomming solar and my battery's SOC to my home assistant raspberry using MQTT.

i then put logic on both ( SOC > 90 and incomming solar > 2000 watts ) -> enable sonoff that controls power to water heater 1
if temp water heater => 65 celcius , shut down water heater
if temp pre heat tank < 65 enable heating element

this is using hass.io , node-red and mqtt
what does your second raspberry pi connected with a serial cable to your inverter run on?
 

houseofancients

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lekeola

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Sep 5, 2021
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I have successfully gone off grid. Fortunately i seem to have oversized my system. Batteries are fully charged by 11am. Sun last till 5pm on most days

I am thinking of designing an automatic system that would power on my air-conditioning when the batteries are fully charged. Anyone with knowledge of such a system or advice?
Thick our my tread, it will help out
I have successfully gone off grid. Fortunately i seem to have oversized my system. Batteries are fully charged by 11am. Sun last till 5pm on most days

I am thinking of designing an automatic system that would power on my air-conditioning when the batteries are fully charged. Anyone with knowledge of such a system or advice?
Check my trend, this will help you monitor ur inverter and ur battery , manage output, and inputsz, check daily, monthly, years consumption, support parallel inverter monitoring, parallel battery like pylontech lithum etc , it's an in one software Solar plant monitoring
 
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