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diy solar

This could be interesting

I've written it down here:

upnorthandpersonal

Post in thread 'Flexible Buss Bars'

In my case I use 18mm outer, 16mm inner diameter pipe. Make sure it's annealed. You might have issues fitting the larger one in this. You kinda want to have the inner diameter of the pipe he squeezed to be as close to the width of the braid as possible. That's why I went with 25mm braid since 16mm*pi/2 = 25mm. The next one up is 35mm, so that would mean an inner diameter around 22mm or so. This does make your contacts quite large. Another thing you can do is double up on the 25mm braid (so make 300A versions). It needs a bit of 'finesse' to find the correct initial amount of squeezing of...
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upnorthandpersonal

Post in thread 'Lishen Battery/Solar build'

I don't have a dedicated post; it's a bit spread out on this forum. However in essence it's just some annealed copper pipe ( 18mm outer, 16mm inner diameter) cut to pieces of about 25mm. This is the braid I use: https://www.copperbraid.co.uk/flat-super-flexible/ (the 25mm² one).
You compress the pipe pieces slightly intill you can slide in the braid. After that, compress it down - preferably with a hydraulic vise or some small manual hydraulic press.

This is a bit larger than yours. Keep in mind that you should be able to find these kinds (or other types) of flexible bus bars off-the-shelf these days.
 
So, now that these solar charge controllers have been running for years without issue, I'm planning on trying something new. I'm thinking of adding a set of vertical panels, about 150m away from the house. For this I need to go higher voltage to make this affordable/feasible. I know Victron has a nice high voltage MPPT, but it's expensive, and probably rather boring :)

There are plenty of inverters available that can take higher PV input, but I don't need that. I just need and MPPT charge controller. Searching through Alibaba, I found this:

www.alibaba.com

Suyeego High Pv Input 450v 4200w 6500w 120a Mppt 24v 48v Lifepo4 Sealed Gel Agm Flooded Lithium Battery Solar Charge Controller - Buy Mppt Solar Charge Controller lifep04 Sealed Gel Agm Flooded Lithium battery Solar Charger Product on Alibaba.com

Suyeego High Pv Input 450v 4200w 6500w 120a Mppt 24v 48v Lifepo4 Sealed Gel Agm Flooded Lithium Battery Solar Charge Controller - Buy Mppt Solar Charge Controller lifep04 Sealed Gel Agm Flooded Lithium battery Solar Charger Product on Alibaba.com
www.alibaba.com www.alibaba.com

I'll contact them next week and see if they can ship DDP (I don't have time to deal with import stuff) and I'll go from there. A fraction of the cost of the Victron. I do hope for some excitement!
 
Thanks for your update. Has your equipment been running for four years without any issues? I think it makes more sense to buy directly from China and use U.S. / European standards for cable sizing.

One thing I noticed is that China uses different amp calculation. My batteries have two 6 AWG internal cables handling 300 amps, which is only rated for 200 amps per NFPA standards. To compensate for that, I connected two or more batteries in parallel and might install a 150-amp fuse.
 
Is that really a 450v 140a SCC for under $200 if opting for slow shipping?

I can’t think of a single thing that could go wrong.
 
Jollysingle said:
Has your equipment been running for four years without any issues?
Click to expand...

5 years even. No issue what so ever.

Jollysingle said:
My batteries have two 6 AWG internal cables handling 300 amps, which is only rated for 200 amps per NFPA standards.
Click to expand...

Also depends on the insulation used and the temperature that can handle. I usually oversize on cables though.

740GLE said:
Is that really a 450v 140a SCC for under $200 if opting for slow shipping?

I can’t think of a single thing that could go wrong.
Click to expand...

Awesome, right!? :)
 
upnorthandpersonal said:
So, now that these solar charge controllers have been running for years without issue, I'm planning on trying something new. I'm thinking of adding a set of vertical panels, about 150m away from the house. For this I need to go higher voltage to make this affordable/feasible. I know Victron has a nice high voltage MPPT, but it's expensive, and probably rather boring :)

There are plenty of inverters available that can take higher PV input, but I don't need that. I just need and MPPT charge controller. Searching through Alibaba, I found this:

www.alibaba.com

Suyeego High Pv Input 450v 4200w 6500w 120a Mppt 24v 48v Lifepo4 Sealed Gel Agm Flooded Lithium Battery Solar Charge Controller - Buy Mppt Solar Charge Controller lifep04 Sealed Gel Agm Flooded Lithium battery Solar Charger Product on Alibaba.com

Suyeego High Pv Input 450v 4200w 6500w 120a Mppt 24v 48v Lifepo4 Sealed Gel Agm Flooded Lithium Battery Solar Charge Controller - Buy Mppt Solar Charge Controller lifep04 Sealed Gel Agm Flooded Lithium battery Solar Charger Product on Alibaba.com
www.alibaba.com www.alibaba.com

I'll contact them next week and see if they can ship DDP (I don't have time to deal with import stuff) and I'll go from there. A fraction of the cost of the Victron. I do hope for some excitement!
Click to expand...
Oh this is going to be awesome!!!
 
I got a response from them and it seems MOQ is 1 unit at the moment, so I'm getting one. Total DDP cost including shipping by air is $267 and it should be here in around 15 days (I am waiting with payment until I also have the communication protocol, so could add a few days).

Now I need to get more panels :)
 
Looks similar to all other low cost Chinese all in one inverters but without the inverter section and 450 > 48V isolated DC-DC is one way only which makes sense as this one is only a battery charger. Great value at $137 (bulk price i assume).
suyeego 120a mppt.JPG
 
upnorthandpersonal said:
So, now that these solar charge controllers have been running for years without issue, I'm planning on trying something new. I'm thinking of adding a set of vertical panels, about 150m away from the house. For this I need to go higher voltage to make this affordable/feasible. I know Victron has a nice high voltage MPPT, but it's expensive, and probably rather boring :)

There are plenty of inverters available that can take higher PV input, but I don't need that. I just need and MPPT charge controller. Searching through Alibaba, I found this:

www.alibaba.com

Suyeego High Pv Input 450v 4200w 6500w 120a Mppt 24v 48v Lifepo4 Sealed Gel Agm Flooded Lithium Battery Solar Charge Controller - Buy Mppt Solar Charge Controller lifep04 Sealed Gel Agm Flooded Lithium battery Solar Charger Product on Alibaba.com

Suyeego High Pv Input 450v 4200w 6500w 120a Mppt 24v 48v Lifepo4 Sealed Gel Agm Flooded Lithium Battery Solar Charge Controller - Buy Mppt Solar Charge Controller lifep04 Sealed Gel Agm Flooded Lithium battery Solar Charger Product on Alibaba.com
www.alibaba.com www.alibaba.com

I'll contact them next week and see if they can ship DDP (I don't have time to deal with import stuff) and I'll go from there. A fraction of the cost of the Victron. I do hope for some excitement!
Click to expand...
Based on your post I ordered a similar one of their high Voc charge controllers that has user adjustable charging voltage since I'm running a 36v battery:

https://www.alibaba.com/product-det...m=a2700.details.you_may_like.3.68002af2mCS10P

Total cost shipped DHL to USA was $225. But not sure how/if the new tariffs will come into play, so maybe another 10%. They said 7 days delivery.
 
CaliSunHarvester said:
I bought a 500V 140A SCC from PowMr on Aliexpress for $180.. it came to $205 with tax/ fast shipping.

Works so far ( 2 months )
Click to expand...

I also saw that one, but I couldn't find anything about communication to the device (say modbus) and discarded it because of that. Does it have a communication port?

Reason: I want to log all the data.
 
upnorthandpersonal said:
Does it have a communication port?
Click to expand...

it does not. Just 2 connections for pv, 2 connections for the battery and one ground connector.
There is no mentioning of a separate Wifi module for data access etc.

So far, I have written down daily production in an Excel spreadsheet, but I'm about to quit that any day now.
 
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upnorthandpersonal said:
I also saw that one, but I couldn't find anything about communication to the device (say modbus) and discarded it because of that. Does it have a communication port?

Reason: I want to log all the data.
Click to expand...
Did yours arrive yet? I got mine and the description says it has rs485, but there's no port for it... I did get wifi and that is working with the Smart Life app which allows me to monitor it remotely. It's working fine so far, but I haven't pushed it yet, only running 1600w of panels to a 36v battery. Will reconfigure my system soon and put 6000w on it.

www.alibaba.com

Suyeego High Voltage Pv 480v Mppt Charge Controller 120a 60a With Rs 485 Communication - Buy 96v Controller 72v Controller mppt Solar Charge Controller High Voltage Product on Alibaba.com

Suyeego High Voltage Pv 480v Mppt Charge Controller 120a 60a With Rs 485 Communication - Buy 96v Controller 72v Controller mppt Solar Charge Controller High Voltage Product on Alibaba.com
www.alibaba.com www.alibaba.com
 
Not yet - should be here soon though. I did ask for the protocol (both the BMS port and the RS-232). The BMS protocol is supposed implement the PACE BMS. I should get the RS-232 (where the Wifi module hooks up to) later today or tomorrow.
 
CommandoJoe said:
Did yours arrive yet? I got mine and the description says it has rs485, but there's no port for it... I did get wifi and that is working with the Smart Life app which allows me to monitor it remotely. It's working fine so far, but I haven't pushed it yet, only running 1600w of panels to a 36v battery. Will reconfigure my system soon and put 6000w on it.

www.alibaba.com

Suyeego High Voltage Pv 480v Mppt Charge Controller 120a 60a With Rs 485 Communication - Buy 96v Controller 72v Controller mppt Solar Charge Controller High Voltage Product on Alibaba.com

Suyeego High Voltage Pv 480v Mppt Charge Controller 120a 60a With Rs 485 Communication - Buy 96v Controller 72v Controller mppt Solar Charge Controller High Voltage Product on Alibaba.com
www.alibaba.com www.alibaba.com
Click to expand...

Also, seems the one I am supposed to get is slightly different compared to the one you link to:

www.alibaba.com

Suyeego Max Pv 500v 48v 120a Bms Mppt Solar Charge Controller Solar Panel Charge Regulator Solar Controller - Buy Solar Charge Controller For Lithium Battery solar Charge Controller 500v 48v 120a Mppt Solar Controller rs485 Solar Controller Product o

Suyeego Max Pv 500v 48v 120a Bms Mppt Solar Charge Controller Solar Panel Charge Regulator Solar Controller - Buy Solar Charge Controller For Lithium Battery solar Charge Controller 500v 48v 120a Mppt Solar Controller rs485 Solar Controller Product on Alibaba.com
www.alibaba.com www.alibaba.com
 
upnorthandpersonal said:
Also, seems the one I am supposed to get is slightly different compared to the one you link to:

www.alibaba.com

Suyeego Max Pv 500v 48v 120a Bms Mppt Solar Charge Controller Solar Panel Charge Regulator Solar Controller - Buy Solar Charge Controller For Lithium Battery solar Charge Controller 500v 48v 120a Mppt Solar Controller rs485 Solar Controller Product o

Suyeego Max Pv 500v 48v 120a Bms Mppt Solar Charge Controller Solar Panel Charge Regulator Solar Controller - Buy Solar Charge Controller For Lithium Battery solar Charge Controller 500v 48v 120a Mppt Solar Controller rs485 Solar Controller Product on Alibaba.com
www.alibaba.com www.alibaba.com
Click to expand...
Yes, I wanted adjustable battery voltage vs fixed at 48v. And on mine the wifi was a $10 add on that is built in, not a port/dongle.
 
Turned it on with a boost converter on the solar input, works great. Can't hook it up to a battery or actual solar just yet. I did start playing with the Wifi interface, which is really just RS232 (like actual real RS232, not UART).

The protocol is some custom thing that could just as well have been modbus. It takes commands in the form of e.g. "05 03 13 A3 00 01 71 28" (hex sequence, last two is the checksum, CRC16/Modbus). 05 03 is common to all commands, 13 can also be 11 depending on the type of command, the 00 sequence is always there, etc.

The response to the command above would be 05 03 02 38 02 DB 85 (bulk voltage 56.8V, little endian integer and /10). Responses seem to be always 05 03 02 followed by the data and again the checksum. The 02 is the length field of the data (without checksum) There are also commands that return more data in one go.

I did not get the protocol documentation from them yet, but I don't think I'll need it. I'll document it once I'm done decoding it all.
 
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