I hope somebody can advise? I have a 75/15 smart solar mppt hooked up to a 150w solar panel and 105ah battery on my campervan. The battery is 5 years old and been used quite a bit. It was tested and showed 26% health, but then the person also said the solar panel was faulty and quoted me to replace it. Would a poor condition battery cause this? I was going to replace it with a 120ah AGM, but before I invest I would appreciate any advice.
I presume from the readout below the solar panel is working fine (sunny today). I notice the battery state is off, but it does go on intermittently. Could the mppt be faulty? The blue light flashes every 4-5 seconds and every 15 or so times (I didn't count) all three lights flash quickly 8 times. The history shows little activity.
Please treat me gently. I'm new to this so simple terms would help. Thank you.