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Solar Logging


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#1 Winter

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Posted 06 July 2019 - 01:59 PM

If anyone is interested - this is a snapshot of todays solar stats off my boat

 

https://snapshot.rai...rl7CLL5GIgtEY2M

 

Work in progress. 

The snapshot shows a measurement every minute, but I'm currently every 15seconds.


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#2 bigal.nz

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Posted 06 July 2019 - 05:04 PM

Very cool. How are you doing that?
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#3 Winter

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Posted 06 July 2019 - 08:06 PM

Epever MPPT solar controller, RS485 connection from that to an onboard raspberry pi, which polls the data and logs it to a database.

 

4G router to access it all.

Software is

Grafana to make the graphs

Node-Red to poll the solar controller and push to database

InfluxDB for storing timestamps and values.

 

been fiddling with this for a while now. Today I've got it updated to show total AH in per day. 


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#4 bigal.nz

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Posted 06 July 2019 - 10:33 PM

Right. I thought of doing something similar, but wasn't sure about the amount of power used by the Pi and 4G modem, and also it seemed a waste of money to pay for a dedicated sim to do that - the prepay data is still expensive?

 

Would be nice if there was Wifi at the club house.....

 

AG


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#5 Winter

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Posted 06 July 2019 - 10:37 PM

yes.. power consumption of the Pi and modem is high.. but I have the shore power most of the time to cover this. 

Maybe one day I'll try dumb it down to lower the power usage.

As for the SIM.. 

2degrees (and some others probably) let you share data among (up to 5) SIMs... I already pay for a sim for a mobile wifi stick thing when I'm travelling,so it costs no extra to share it with the boat


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#6 bigal.nz

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Posted 07 July 2019 - 01:01 PM

Right thats good to know about 2degrees. I have 25Gb or some crazy cap with Vodafone, but no way to share it - I am thinking of changing.

 

I actually think I RaspPi even in mid winter wouldnt kill the batteries as they are kept full by solar easily.


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#7 Winter

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Posted 07 July 2019 - 05:26 PM

I actually think I RaspPi even in mid winter wouldnt kill the batteries as they are kept full by solar easily.



well this is what i set out to proove 😀
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#8 bigal.nz

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Posted 08 July 2019 - 04:44 PM

Looks like the max draw of a rasp pi is 1A at 5v. I guess at 12v the max draw would be something like 0.4 and if the pi is idle probably 0.2a.

I think our batt bank is about 350Ah so that should easily cope.
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#9 bigal.nz

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Posted 08 July 2019 - 04:46 PM

Guess I also need to factor in the 4G modem.....

In my setup currently the only way to monitor anything on the n2k bus would be leaving the Vesper on. Not going to do that.
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