Hi, I'm getting some worrying behavior from my set up today. Not something I've seen before. It's a mixed day with clouds and then full sun.
When overcast everything seems normal.
When the sun comes out the PV wattage jumps right up and the battery voltage spikes to about 14.65 volts. Then the wattage then immediately cuts right back to 1 and the battery voltage reduces to 13.3ish. The watts and voltage then jump up and rapidly max out again, and the cycle repeats.
It is doing this in both absorption and bulk mode. The absorption voltage is set to 14.4v and float is set to 13.67v.
My equipment is:
- 100/20 MTTP
- MTTP Control
- 200w 24v Victron Panel
- 100Ah 12v pure lead/carbon battery
- BMV 700
Having done this all morning - rapidly fluctuate between 1w to 130w PV and 13.3v to 14.65v battery in both absorption and bulk modes - it's now stable in float at 35w and 13.64v.
Is this normal?