I have an idea but not sure if its safe to do so. 

I have 5 Pylontech modules(1xUS3000C & 4xUS2000). They work very well. I recently installed more PV panels to attain more amps to charge the batteries as in winter it was struggling with my previous single array. I now have 6kw of PV power and can roughly translate to 120A of battery charging on a good day in summer. My batteries will take up to 137A based on the BMS values but i doubt my PV will be able to deliver that much. 

My concern is that the Pylontech cable pack that is supplied with these batteries are not rated high enough for this constant current while charging. From what I read, its rated at 120A but I am not convinced as the cable is not as very thick. Right now, its taking 80A to the battery and the cables are warm to touch in this icy cold weather, now how warm or hot will it get in summer with a higher environmental temp and higher amps and will it hold out?

Has anyone tested its actual rating or found a review out there on these cables?

I was thinking of adding a second cable pack to address my concern but I am not sure if its entirely feasible or safe? Below are my batteries current configuration, pretty standard. I want to add the second cable pack and attached it to the blue circled unused connectors. Is this a dumb idea altogether?

Opinions and thoughts would be appreciated. 

 

 

1 hour ago, PurePower said:

I have an idea but not sure if its safe to do so. 

I have 5 Pylontech modules(1xUS3000C & 4xUS2000). They work very well. I recently installed more PV panels to attain more amps to charge the batteries as in winter it was struggling with my previous single array. I now have 6kw of PV power and can roughly translate to 120A of battery charging on a good day in summer. My batteries will take up to 137A based on the BMS values but i doubt my PV will be able to deliver that much. 

My concern is that the Pylontech cable pack that is supplied with these batteries are not rated high enough for this constant current while charging. From what I read, its rated at 120A but I am not convinced as the cable is not as very thick. Right now, its taking 80A to the battery and the cables are warm to touch in this icy cold weather, now how warm or hot will it get in summer with a higher environmental temp and higher amps and will it hold out?

Has anyone tested its actual rating or found a review out there on these cables?

I was thinking of adding a second cable pack to address my concern but I am not sure if its entirely feasible or safe? Below are my batteries current configuration, pretty standard. I want to add the second cable pack and attached it to the blue circled unused connectors. Is this a dumb idea altogether?

Opinions and thoughts would be appreciated. 

 

 

Batteries should have double cables when you have 4 or more batteries. 

1 hour ago, Achmat said:

Batteries should have double cables when you have 4 or more batteries. 

Great thanks, which document is this from?

50 minutes ago, PurePower said:

Great thanks, which document is this from?

Official pylontech training manual. Can't recall where I got it. 

Also your battery cable will run cooler with double cables. I have 4 pylontech us3000 batteries and since adding the second cable pack, the cables are hardly warm under full load. 

Pylontech 195006_PDF1.pdf

Thank you. 

Best online place to order that cable pack from?

+1 For Achmat's comment.

The Pylon cables are  marked 105 deg C and 4 AWG. So most sites would say that the max current is 95A. 

The Pylons use the Amphenol SurLok connectors - 5.7mm which are rated at 120A max. 

So your 137A charge/discharge current limit would exceed the current carrying capacity of the Pylon's cable size and the the connectors. 

So your idea to double up the cables would work just fine. A thrifty way to save a few bucks is to use the spare pair of short cables already fitted with SurLoks on either end which you would have as every Pylontech comes with one so you should have one spare. Cut the one end off and crimp a 25 sqmm  cable and heatshrink onto the free end and you will have your own DIY Pylontech cable pack 😬 

18 hours ago, PurePower said:

Thank you. 

Best online place to order that cable pack from?

I see you are in JHB, best will be to take a drive and go to communica in midrand and buy. You will not have to wait for weeks or days to get your cables. Check the address here  https://www.communica.co.za/

On 2021/07/25 at 11:06 AM, PurePower said:

I have an idea but not sure if its safe to do so. 

I have 5 Pylontech modules(1xUS3000C & 4xUS2000). They work very well. I recently installed more PV panels to attain more amps to charge the batteries as in winter it was struggling with my previous single array. I now have 6kw of PV power and can roughly translate to 120A of battery charging on a good day in summer. My batteries will take up to 137A based on the BMS values but i doubt my PV will be able to deliver that much. 

My concern is that the Pylontech cable pack that is supplied with these batteries are not rated high enough for this constant current while charging. From what I read, its rated at 120A but I am not convinced as the cable is not as very thick. Right now, its taking 80A to the battery and the cables are warm to touch in this icy cold weather, now how warm or hot will it get in summer with a higher environmental temp and higher amps and will it hold out?

Has anyone tested its actual rating or found a review out there on these cables?

I was thinking of adding a second cable pack to address my concern but I am not sure if its entirely feasible or safe? Below are my batteries current configuration, pretty standard. I want to add the second cable pack and attached it to the blue circled unused connectors. Is this a dumb idea altogether?

Opinions and thoughts would be appreciated. 

 

 

I'm wondering why you would not have the communication link cables between the batteries connected.

Edited July 27, 20214 yr by De0n19

4 hours ago, De0n19 said:

I'm wondering why you would not have the communication link cables between the batteries connected.

Apologies, that's an old picture. I was having trouble back then with the US3000C mixing with the US2000 and was testing if removing the link cables would solve the problem but it didn't. Firmware v2.1 for the US3000C solved all the issues. Below is the latest pic taken now, link cables all in place.

Thanks for the info. So you are going to have 2 sets of pylontech cables going to a fuse and then to the inverter via maybe a 35mm cable? What size of fuse would then be appropriate for this? Or is it better to have each cable fused with like an 80A fuse then going to the inverter? Or is fusing not required in this scenario?

48 minutes ago, De0n19 said:

Thanks for the info. So you are going to have 2 sets of pylontech cables going to a fuse and then to the inverter via maybe a 35mm cable? What size of fuse would then be appropriate for this? Or is it better to have each cable fused with like an 80A fuse then going to the inverter? Or is fusing not required in this scenario?

Yip, both cables will go to my Mersen DC breaker. I currently have 125A Fuse in it, which is more than enough for my usage. My battery pack will only allow up to 137A of draw at a time but I don't want it to get there as it is unnecessary for my electricity demand. Technically, I could have each cable set going to a busbar prior to the DC breaker but I feel its not required in my setup. Between the DC breaker and the inverters I have 35mm cable. Here is a pic of my setup, I have circled the DC breaker.