I have a 6 solar panel setup with a 250/60 mppt and 2 300ah batteries that don’t seem to take a charge even tho the are making about 100v and roughly 500w yet the batteries don’t take a charge. The inverter is 3500w I also have the smart solar shunt to tell me the battery power any tips on what’s wrong
Should it be charging?
What is the battery voltage at this time?
Is it near the target voltage set?
How is the inverter and system programmed? Is there a GX as well?
I have the most basic of setups a string of 6 solar panels on my shed connected to the mppt then the batteries wired in. They go to the inverter with the shunt connected to both batteries in not sure if I should have the mppt wires on the 1 battery or the 2
Voltage is around 14.odds lowest is 13.odds says it’s making 5kw a day roughly but that doesn’t seem to be transferred into the batteries for night use
I have the rotary switch set to 7 for lithium batteries as the mppt comes out set at 2 I’ve checked all connections are tight my shunt and inverter and socket only use around 60w
Can i assume 12v? Mppt should be across the 2 definitely. Is it a 12v or 24v system?
Does the mppt say smart solar on it?
Yes it’s a victron and so is the solar shunt all runs at 12 v looks like it’s working perfectly but the batteries keep depleting even tho max voltage at 1 point was around 120v
Check the rebulk offset on the mppt under expert settings.
That is my setup can you see anything wrong with it I’m starting to lose the will
I think that goes to the second battery but il double check
Where is the SCC battery negative? I don’t see enough connections after the shunt.
IF there are 3 lugs on the first battery, I believe you are on the wrong size of the shunt with your solar
Its not that the batteries aren’t taking a charge, it is the systems physical set up that is an issue. So the shunt is only reading discharge.
Nothing at all should be connected directly to the battery bank except the shunt. Everything else including mppts and inverters should be on the other side of the shunt.
Thank you il swap the wires around and give it a try
flowchart LR
Solar[Solar Panels] --> MPPT[MPPT 250/60]
POS[Positive Bus Bar]
NEG[Negative Bus Bar]
BAT1[LiFePO₄ #1]
BAT2[LiFePO₄ #2]
SHUNT[Smart Shunt]
INV[12/3000 Inverter]
MPPT -->|+ fuse| POS
MPPT -->|-| NEG
BAT1 -->|+| POS
BAT1 --> BAT2
BAT2 -->|-| SHUNT
SHUNT --> NEG
POS -->|+| INV
NEG -->|-| INV