After discharge MPPT 100/30 charges 30% of what it did before

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Jason Koch asked Jul 9, '23

After discharge MPPT 100/30 charges 30% of what it did before

Any solar sherlocks out there can help? It is as iff my solar controller is throttling the current from the panels. much appreciated:

My setup

RV
400ah= 4x100ah Battle born LifePO batteries
300w = 3x100W Renogy solar panels mounted in parallel
100/30 solar controller, multiplus inverter, smartBMV
2 year old system

The event

On June 11 had a deep discharge on my RV for a couple days. Plugged the RV back in to shore power charged back up easily.
Since then max watts from solar is around 30watts. Previously would get to 110watts easily at mid-day.

What I have checked

VOC/Isc on Renogy panels it is 21v/4.8amps -- not too bad. so panels are good
tried rebooting MPPT 100/30 controller
Checked all my connection to make sure not loose
Checked the fuse between solar controller and battery, no problem
Checked all my Victron settings setup for LifePo Battleborn batteries. Looks good

Photos

MPPT SmartSolar smart solar charging behaviour

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Modifications Space

Node Red Space

Answer 1 · 2023-07-09T20:20:24Z

mvas answered · Jul 09, 2023 at 08:20 PM

Separate the 4 batteries. Then charge / discharge (test) each battery individually with a known good charger. Then you will know if the batteries are still good or not.

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Answer 2 · 2023-07-10T04:50:13Z

kevgermany answered · Jul 10, 2023 at 04:50 AM

The solar history chart shows multiple days where battery voltage dropped to zero. This stopped, presumably when you did the AC charge. Also highest battery voltage was very low.

You need to check, but first guess is the BMS was disconnecting the batteries, possibly because they were exhausted and to prevent damage.

Lower charge rate at present could be due to batteries not accepting the higher rate since you charged from AC.

This gives the impression that before the incident solar was inadequate. (Which can lead to internal imbalance in the batteries).

It's odd that before the incident, max charge rate was so low. It's as if there's a faulty panel/connection. And as if the incident was caused by an additional problem with solar generation. If you can, suggest you check each panel's output with a clamp meter. Guessing you have panel faults. And until the problem is resolved, charge on shore power, giving plenty of time at 100% to allow the batteries to rebalance.

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