Big Solar + Tiny Solar panel in parallel
Put in 380W solar + Rogue MPPT a while ago. With no loads, in storage, the Rogue should go through a daily cycle: Rest at night, very brief MPPT in the morning up to 14.8V, then very brief Absorb ...
Forum Discussion
BFL13 wrote:
Good to see it now works right. 13.2 is sometimes the set voltage for going beck to Bulk with MPPT controllers. ISTR you said the Rogue makes that trigger to be the same as the chosen float setting?
Some have a time in there so Vbat has to be under the trigger for a minute before it will go to Bulk/MPPT. So I suppose if your 13.2 is float and trigger it can take a spike below 13.2 and not go into bulk. Seems kind of tight.
If the solar is still capable of doing more amps then any loads up to a point will not disturb the float, but if the loads are more than the solar can do, then with some controllers that have a separate float setting and a trigger setting less than that, what happens is the Vbat slides down to the trigger and then it goes MPPT/Bulk
With those two settings being the same value, it would go into MPPT/Bulk a minute (if that is the time) after the solar can't meet the demand ? Could be a bit "trigger happy" if you have an intermittent load when the sun is not very high?
With the Rogue, you set the Float voltage, and as long as that can be maintained, it stays in Float mode. But if it drops 0.5V below that (because of loads or lack of sunshine), it switches to MPPT.
For that reason, I up the float voltage to 13.6V when boondocking and actively using the batteries. MPPT kicks in sooner that way and I end up with more charge in the batteries when the sun sets. I only set to 13.2V when in storage and the batteries disconnected from the loads.
