Hi,
I have 100/30 charge controller, with two 150w solar panels wired in series. When in bulk charging mode, I am getting very little solar charge, with my voltages from my solar system fluctuating from 9ish volts up to 45v, back to 9 and then 45 again constantly. This is on a completely clear day with no clouds, shading etc. I actually get slightly higher watts on cloudy days but similar voltage experience (video below)
Some things to note;
- with the installer, we switched out the charge controller but continued to get the same experience.
- re-wired the solar panels and tested them, all fine. All connections across system seemed good.
- Shore charged the battery to 100% (battery is victron 300ah lifepo4) to get it into absorption and float mode but once it went back into bulk mode, kept happening again.
- when it was in absorption and float mode, voltage fluctuation stopped.
The most I am getting in full sun is around 15-20watts. Typically it will touch 40-50watts if a bit cloudy. It’s almost like something is stopping it from allowing too much charge, but the shore charger and dc-dc engine charger are working just fine.
Any help would be greatly appreciated.