question

joeoffgrid avatar image
joeoffgrid asked

Blue Solar going straight to float. Thus voltage based load output not turning on

I know it has been reported a few times that the chargers go into float (too?) quickly. I cannot judge whether this will hurt my battery in the long run or not. But my problem is this: I want to give priority to make sure the battery is fully charged before turning on the load. So I choose voltage based load settings. Since my chargers are now all sitting idle at float they won't turn on the load. Some people suggested excess power calculation. I don't know whether something like this will be introduced and when.

I simply suggest more parameters to calibrate for this setting. Like the timers and solar voltage and a couple of dependecies.

MPPT Controllerscharger
2 |3000

Up to 8 attachments (including images) can be used with a maximum of 190.8 MiB each and 286.6 MiB total.

1 Answer
adev avatar image
adev answered ·

which particular model are you using, and what type of batteries? Using the batteries whilst charging shouldn’t be an issue at all, however if you really want to do this, then setting your upper load voltage limit to just above your float voltage should do the trick. Once the battery is charged it will always stay in float so long as the PV voltage is greater than the battery voltage and there’s no load pulling the voltage lower. (ie during most of daylight hours).

3 comments
2 |3000

Up to 8 attachments (including images) can be used with a maximum of 190.8 MiB each and 286.6 MiB total.

joeoffgrid avatar image joeoffgrid commented ·

I'm using several 75/10 and 75/15 chargers to charge lead acid. Priority should always be to keep the batteries full.

I just want to make use of the excess solar energy. When turning the load on too early I think it is very likely to have a hunting phenomenon and/or have the battery not charged on cloudy days.

Shouldn't be hard to implement like "turn load on if Ubatt > w V for Tbatt x sec AND Usol > y V for Tsol z sec." Just to add x, y, z in the menu.

I chose solar for high voltage output so that the battery is charging even in poor light conditions. Voltage is often high but power output not necessarily.


0 Likes 0 ·
Show more comments

Related Resources

MPPT Product Page

MPPT Error codes

MPPT 150/60 up to 250/70 Manual

Additional resources still need to be added for this topic