Battery slowly discharging, limited by charge controller

[superjagger]

Hi all,

I have an odd issue where my battery discharges, even with full sun. The problem only occurs when the inverter is under load (think an average of a constant 100 watts).

The charge controller seems to not supply enough amperage to the battery when the inverter is on in order to keep the battery topped up. Once I shut the inverter off, the charge controller is able to charge the battery to full fine.

This AM I was pulling 75 watts constant off the inverter, yet my charge controller was only allowing ~3amps to the battery (3x13.8 = 41.4 watts) not nearly enough to avoid pulling from the battery bank.

I've seen this same system charge at 10+ amps when not under load.

Inverter and Charge controller are wired directly to the battery, separately. (Inverter 6 AWG - Good till ~575 watts) (CC using 10 AWG, good for 20 amps)

There is a considerable distance to travel the CC is approximately 50 feet from the battery. Inverter is on a 2ft cable.

Do I just have a crap CC? Any suggestions/ info welcome. I'm looking to learn more and improve my setup.

Thanks,
J

 

[superjagger]

I should add, I start my day with 13.8 volts, a full charge with a static charge, and after 9 hours of running a load I have 11.5volts.
I have 220 usable watts as input right now, under full sun conditions.

 

[superjagger]

After reading around the forum, I'm going to try moving the CC right next to the battery to rule out voltage drop as the issue.

 

[superjagger]

Moved the CC closer, RESOLVED the issue.
Battery reaches 100% throughout the day as loads change/sun exposure changes - AS EXPECTED!