jonescg's home battery storage system

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T1 Terry
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Re: jonescg's home battery storage system

Post by T1 Terry »

Shitte, I'm glad I only do off grid solar/battery/inverter jobs, that all looks like a massive headache for very few $$ return from the grid. I do enjoy giving the grid supply the "bird" when they ask about certain items they consider are an essential, like the fire starters on the solar arrays ..... they don't appreciate being told their authority stops at the pole out the front or the main power board (on a hybrid system where the mains supplies the really hungry stuff) because we are not letting them have any of our solar/battery energy

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jonescg
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Re: jonescg's home battery storage system

Post by jonescg »

Yeah we would need a generator through June and July, especially if we're charging the car at the same time. I've already run the battery flat once - it was a cold night and the car was on charge. But for 10 months of the year it's great.
AEVA National Secretary, WA branch chair.
francisco.shi
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Re: jonescg's home battery storage system

Post by francisco.shi »

You can disconnect during summer and reconnect in the winter. :lol:
Or put more solar panels so you don't run flat in winter.
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Re: jonescg's home battery storage system

Post by Rusdy »

francisco.shi wrote: Thu, 01 Oct 2020, 15:17 The question is:
Is it worth to pay $200 per year to be connected to the grid if you can generate all the energy you need.
...
It's $360 for us in WA :( . Unless it's different in Albany, @Chris?

I do wish solar panel can violate physics, i.e. 100% efficient to convert everything to electricity. With that kind of efficiency, I won't need to buy a new house (or land) to cover my winter shortcoming. Mine is almost 5x lower generation in winter, but twice the consumption :( . Using 2018 data:

Image
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jonescg
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Re: jonescg's home battery storage system

Post by jonescg »

No, it's still $360 per year, but if I can export a few cents worth of power each day, my total outgoing costs might be closer to $200 instead of $360.

Our house is not very warm in winter, so the heat goes on a lot. If we can do as much charging elsewhere through winter as possible we might be able to get through OK.
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francisco.shi
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Re: jonescg's home battery storage system

Post by francisco.shi »

Have you checked if your inverter us selling power out of the battery?
I would be interested to know if it is just me having this problem.
I am not too worried at the moment because with summer on us the panels make more electricity than what I use so it is not an issue until winter comes.
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jonescg
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Re: jonescg's home battery storage system

Post by jonescg »

If I'm using the battery it discharges a small amount to the grid at all times. Maybe 100 W or so. Likewise at night, when loads are less than 50 W, it's importing from the grid, about 100 W or so.
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jonescg
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Re: jonescg's home battery storage system

Post by jonescg »

Goodwe must have done an over-the-air update on the inverter!

Because up until midday yesterday, the SOC was meaningless - it went down as you charged it, it went up as you discharged, and generally made no sense:
Updated inverter..JPG
Updated inverter..JPG (52.42 KiB) Viewed 70 times
And this is today's data:
SOC working!.JPG
SOC working!.JPG (89.75 KiB) Viewed 70 times
I wonder if this will stop the discharge at 10% SOC like I asked it to?
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brendon_m
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Re: jonescg's home battery storage system

Post by brendon_m »

Mines always worked correctly, possibly because it came with a later update out of the box.
My firmware is 2171710, is your one the same?
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jonescg
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Re: jonescg's home battery storage system

Post by jonescg »

I don't have a BMS signal going to the inverter, so it's set up on a User Defined protocol.
And it was looking grand until this morning when it reverted to garbage again. Oh well. Might try and mess with it on the weekend.
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francisco.shi
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Re: jonescg's home battery storage system

Post by francisco.shi »

I had the same happen to mine. About two days ago the backup power went out and the inverter started making funny noises (I wasn't home at the time. My wife told me) then after that the SOC started looking like it should so my guess is they did a software update. About midnight yesterday it stopped using the battery even though the battery had enough charge then at about 4am it went back to taking energy from the battery.
My SOC is still looking right. I hope they do not add any undocumented new features.
francisco.shi
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Re: jonescg's home battery storage system

Post by francisco.shi »

I was going to ask you if yours suddently started showing a realistic SOC but you answered my question already.
francisco.shi
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Re: jonescg's home battery storage system

Post by francisco.shi »

Here is mine on the day it changed over.
SOC fixed.
SOC fixed.
Screenshot_20201127-091052_SEMS Portal.jpg (299.74 KiB) Viewed 59 times
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jonescg
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Re: jonescg's home battery storage system

Post by jonescg »

I just realized it's in fact working correctly. I didn't read the RHS axis correctly :)
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