diy solar

diy solar

My 44kW vertical and bifacial set in Finland.

About AC coupling: Should I use Deye's GEN-port with my on-grid inverters all the time, or just during power outage (using ATS to connect/disconnect)? Pros/cons if any? Tried to find something about this from the manual, but with little success. I found a picture telling there's an "AC coupling mode" (Mode IV), but that's it. I mean do I need to tick some box to make it work or something? In any case I expect having hard times to make every setup menu to work as they should, but this AC coupling thing is just over my head.

Help Please!:)
 
yabert said:
Haha! No, there is a tool on internet... ummm it's... aaaah, try to remember the name... oh! oh, yeah, it call google translate ?
Click to expand...
Oh, okay, I think I have heard of it somewhere...:unsure:
:)

Way back, after graduating from uni, I lived in Twin Cities for few months and to my surprise everybody there seem to have relatives in Finland/Sweden/Germany. U of M had even a club to keep up with Finnish language. At the local gym there was a real sauna and I don't mean any stupid steam room (which they had also). There was no bucket to throw water over the stones, so of course I asked one from the reception. They said that they can't do that as I could hurt myself. When I told I'm from Finland they immediately gave the bucket and asked if they could came to sauna with me... After that I was treated like a king every time I went there. Good memories...
 
IT'S ALIVE!!! Well, half of it anyway...

Had the inspection today and it seems I don't have bidirectional metering. They will change my meter as soon as they can, maybe next week. But then he said there's no harm if I turn my system on to test it. I asked how long should I test it and he said I can test it until I get the meter changed...

So far I have only connected half of my array, but 22kW is better than nothing. ?
 
shadowmaker said:
There's a new video about BBMS that was published yesterday.

I like everything else in this video but to stop charging at 100% at the start of LFP upper voltage elbow. Although it is fine capacity wise as you really don't gain much Ah going further/higher to that voltage elbow, you still need to go over 3,4-3,5V to get cell balancing started by BMS. I think that is critical in the long run.
Click to expand...
I remember when they came out with the first version of this thing. I don't think much of mixing the two chemistries, so I don't like the idea in general.

For the current thread: Isn't this BBMS meant for 12V systems? I know it is designed for boats, and most sailboat owners stay with a 12V-only system.
 
Horsefly said:
I remember when they came out with the first version of this thing. I don't think much of mixing the two chemistries, so I don't like the idea in general.

For the current thread: Isn't this BBMS meant for 12V systems? I know it is designed for boats, and most sailboat owners stay with a 12V-only system.
Click to expand...
Maybe not ideal, but might still be the best what I can achieve with this setup (44kW solar, 2x hybrid and 2x on-grid AC coupled, 75kWh LFPs and one big 30kWh FLA). I mean I could use one hybrid to charge the FLA only and use the other one for LFPs, but while LFP storage capacity is around 90% of its rated capacity, for FLA it's only max 50% and for an old and battered one like mine maybe 30-40%. That would mean actual storage capacity of 67,5kWh vs 10-12kWh per inverter. I have no hurry with this, so at first I'll try it this way, but I might need to spread the battery capacity more evenly between those inverters and for that BBMS might be the best (and only?) solution available.

BBMS can be used with 12V, 24V, 36V and 48V systems.
 
Here's the busbar setup.
20230316_082404.jpg

Here's few photos of the panel array. I think the backside is actually polycrystalline as it is clearly bluish in color. Don't know if it's just cheaper to manufacture or if there's an actual reason for it. Still need to ground everything when I get the time.
20230316_153047.jpg

Frontside.
20230316_153225.jpg
 
fromport said:
Why is there a black wire connected to the top bus bar which I suppose is positive since the rest are red wires ?
If this is indeed a positive cable, mark it with some red tape near the end (both inside and outside the gutter) to identify it as positive !
Click to expand...
Buying red and black pieces of 95mm2 (=3/0) welder cable would cost more than one piece of black that I can cut myself into two pieces. Finding red welder cable here is also difficult or even impossible. Will get those cables and busbars marked, but this is work in progress. Even though half of the system is already working, there's still a lot to be done and learn.
 
It snowed/rained all day. It was above freezing, so no actual snow accumulation. Visibility was only about 500m and no sun to be seen. My friend lives 10km away and has his half year old 50kWp solar array installed on barn roof. Monocrystalline, south oriented, no shadows. With identical weather conditions he made 10,3kWh today while I made more than that with only one inverter (=11,2kWp). All four combined I made 43kWh with smaller system (44kWp). That is way better than I expected.

Weather at noon time.
Snowing.jpg

Output at noon. This is from 11,2kWp (=1/4) section of my array.
production snowy noon.jpg
 
shadowmaker said:
All four combined I made 43kWh with smaller system (44kWp). That is way better than I expected.
Click to expand...
Finland has been named the happiest country in the world for the sixth year running.
I’m guessing they polled you and your neighbor.

Maybe members here will visit:

  • It's now offering 10 people a free trip to take part in a "Masterclass of Happiness."

After repeated success in the area, Visit Finland is now offering ten people the chance to come to the country and learn how to be happy like the Finnish.

Visit Finland's "Masterclass of Happiness" is scheduled to take place over 4-days in June at the Kuru luxury retreat in Finland's Lake District. Visit Finland will cover all travel and accommodation expenses, which include a private room, access to a private sauna and spa, and all other "essential facilities," according to Visit Finland's website.

www.yahoo.com

Finland is offering free vacations for people to come and learn how to be happy after being named the happiest country in the world

The nordic country topped the rankings with a score that was "significantly ahead of all other countries," according to the World Happiness Report.
www.yahoo.com www.yahoo.com
 
Danke said:
Finland has been named the happiest country in the world for the sixth year running.
I’m guessing they polled you and your neighbor.

Maybe members here will visit:

  • It's now offering 10 people a free trip to take part in a "Masterclass of Happiness."

After repeated success in the area, Visit Finland is now offering ten people the chance to come to the country and learn how to be happy like the Finnish.

Visit Finland's "Masterclass of Happiness" is scheduled to take place over 4-days in June at the Kuru luxury retreat in Finland's Lake District. Visit Finland will cover all travel and accommodation expenses, which include a private room, access to a private sauna and spa, and all other "essential facilities," according to Visit Finland's website.

www.yahoo.com

Finland is offering free vacations for people to come and learn how to be happy after being named the happiest country in the world

The nordic country topped the rankings with a score that was "significantly ahead of all other countries," according to the World Happiness Report.
www.yahoo.com www.yahoo.com
Click to expand...
Well, I think they are mistaking between being happy and not being unhappy. Living here in cold and dark has genetically engineered us to be pessimists just to survive. A pessimist is never happy, but because you are always expecting the worse, it's also impossible to be unhappy too. So I think in their survey they found out there's not a single unhappy person in Finland and misinterpret that to mean we have to be happy. I can assure we are not, EVER.
 
shadowmaker said:
Well, I think they are mistaking between being happy and not being unhappy. Living here in cold and dark has genetically engineered us to be pessimists just to survive. A pessimist is never happy, but because you are always expecting the worse, it's also impossible to be unhappy too. So I think in their survey they found out there's not a single unhappy person in Finland and misinterpret that to mean we have to be happy. I can assure we are not, EVER.
Click to expand...
Yeah, I come from Scandinavian roots. I think here we call it stoic.
 
Connected CT sensors yesterday. My inverters are 75m (250ft) away from my main panel, so I used one CAT5e wire. I installed only one CT per phase (three phase used here, so 3 CTs) for two inverters and made the split at inverter end of the wire. From CAT5e three wire pairs were used and one left unused. To my surprise CAT5e seems to be able to carry the signal all the way, but when divided among two inverters, the output also halves and both gets wrong data. For one inverter it seems to be fine, so I still need to install a second set of CTs and another CAT5e for the other inverter to make it work.

I have read from here and watched Deye videos where CT arrow is always pointed toward utility connection, but still my installation manual tells me to point the arrow towards inverter. I though this was a mistake, but after testing I think the manual is right after all. At least when installed toward grid I have (for example) a total reading of negative 5kW when drawing from grid and then increase selling to 5kw, the outcome is zero. I'd assume that selling should increase negativeness, but now it is increasing positiveness.

Positive CT reading should mean I'm buying electricity from grid and negative that I'm selling to grid, right? If this is the case I need to change CT orientation.

One more question: Should I parallel the two Deyes together? They have different batteries (LFA vs LFP) so they need different battery settings. If paralled there's only one battery setting?
 
shadowmaker said:
Connected CT sensors yesterday. My inverters are 75m (250ft) away from my main panel, so I used one CAT5e wire. I installed only one CT per phase (three phase used here, so 3 CTs) for two inverters and made the split at inverter end of the wire. From CAT5e three wire pairs were used and one left unused. To my surprise CAT5e seems to be able to carry the signal all the way, but when divided among two inverters, the output also halves and both gets wrong data. For one inverter it seems to be fine, so I still need to install a second set of CTs and another CAT5e for the other inverter to make it work.

I have read from here and watched Deye videos where CT arrow is always pointed toward utility connection, but still my installation manual tells me to point the arrow towards inverter. I though this was a mistake, but after testing I think the manual is right after all. At least when installed toward grid I have (for example) a total reading of negative 5kW when drawing from grid and then increase selling to 5kw, the outcome is zero. I'd assume that selling should increase negativeness, but now it is increasing positiveness.

Positive CT reading should mean I'm buying electricity from grid and negative that I'm selling to grid, right? If this is the case I need to change CT orientation.

One more question: Should I parallel the two Deyes together? They have different batteries (LFA vs LFP) so they need different battery settings. If paralled there's only one battery setting?
Click to expand...
if you parallel them together , your sense problem will also be solved, as the master comms the measurements to the slave(s).
i found the CT's to be rather inaccurate, no matter what direction i point the arrow.
could be due to the amount of cable ( magnetics fields) and space i had in my incomming powerpannel

did away with the ct's completely and put in a eastron sdm630 modbus v2.
looks better, works extremely precise and used modbus, with runs fine over longer distances and utilizes cat6 cable
 
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