SolarBro
Solar Budgeteer
- Joined
- Jun 27, 2020
- Messages
- 91
My system for reference. https://diysolarforum.com/threads/10-kw-diy-install-mpp-solar-lv5048-2x-tesla-modules.10285/
So i'm having an issue, over the past 2 months by tesla modules have been shifting in voltage between each other. @Will Prowse
In week one - Module 1 - 24.1v / Module 2.0 - 24.1v.
2 months later - Module 1 - 23.9v / Module 2 - 24.2v - A .3v difference!
Im trying to understand why there is this shifting voltage difference between the modules. I've been having a hunch about it.
1. Do my positive and negative leads from the battery's need to be the EXACT same length?
If so, Do i compensate for the positive lead having to go through my breakers and fuse, thus adding length to the positive run? Is this an issue? should i make my negative lead longer then?
1a. I have 2 gauge windy nation wire (200 ampacity) going to my LV5048 inverter but i have 4/0 copper cobra-flex (400 ampacity) inbetween the modules. Is this an issue?
2. Is my LV5048 doing un-even charging? Any reason why it would do this?
3. Should I switch the battery position so that i reverse how the negative and positive currently run through the packs? Maybe there is an imbalance in one pack over another?
4. Is one pack weaker than the other? and is there anything i could do to compensate for this?
I'm trying to figure this out, meantime i will pull the battery's and put them in parallel to balance them again for now.
So i'm having an issue, over the past 2 months by tesla modules have been shifting in voltage between each other. @Will Prowse
In week one - Module 1 - 24.1v / Module 2.0 - 24.1v.
2 months later - Module 1 - 23.9v / Module 2 - 24.2v - A .3v difference!
Im trying to understand why there is this shifting voltage difference between the modules. I've been having a hunch about it.
1. Do my positive and negative leads from the battery's need to be the EXACT same length?
If so, Do i compensate for the positive lead having to go through my breakers and fuse, thus adding length to the positive run? Is this an issue? should i make my negative lead longer then?
1a. I have 2 gauge windy nation wire (200 ampacity) going to my LV5048 inverter but i have 4/0 copper cobra-flex (400 ampacity) inbetween the modules. Is this an issue?
2. Is my LV5048 doing un-even charging? Any reason why it would do this?
3. Should I switch the battery position so that i reverse how the negative and positive currently run through the packs? Maybe there is an imbalance in one pack over another?
4. Is one pack weaker than the other? and is there anything i could do to compensate for this?
I'm trying to figure this out, meantime i will pull the battery's and put them in parallel to balance them again for now.