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When the ambient temperature of my BlueSolars is like 38°C consumers connected to the load terminals are sometimes not working despite both LEDs are steady and the app reading "load on" and battery voltage at float.
Two different consumers (fan and compressor box) on two completely separated solar setups behaving like that.
If they overheat, why is there no indication at all?
@mvader (Victron Energy), @Martijn Coster (Victron Energy Staff), or who can answer my question?
Hi @JoeOffgrid
What is the exact load on the output? We need to know the following:
what loads specs and also can you measure the load output voltage terminals on the product itself when the issue happens (and on input terminals to compare please)
I trust the readings of the controller: Somewhere around 13V. On battery and load terminal. Loads are a small compressor cooling box (5A max) and a fan respectively (2A on separate Blue Solar).
Does the Blue Solar have an over temperature protection at all?
Hi there I know from previous posts regarding temp I think I maybe right in saying 40c is max for charge controllers they have been reported as functioning irrational at certain temps, I would try and cool the unit more down to 30c if possible and see if that fixes your error, if possible power it down and allow to cool properly then boot back up, also just to double check the cooling fins at the rear are clean as to dissipate maximum heat. Hope it helps a bit thanks David
Unfortunately no chance to cool the unit down inside of the van. It's so hot when it is sitting in the sun. Actually, I have a fan on the load terminal that is supposed to force cold outside air in.
No problem Joe I would say it’s definitely temp related perhaps relocating the mppt might be worth considering as that temp will shorten its life also so the cost to relocate it will pay you back time over if it’s not possible I would urgently get another high powered fan to blow from the bottom up the cooling fins to make the heat rise quicker and thus cooling it faster, I would expect premature failure of the unit operating at that temp thanks david
Hi @JoeOffgrid
What model do you have exactly? If you have the smallest model, a cooler is probably too big of a load. a compressor has a very high starting current.
Also: there is no derating on the load output. And if the charger is measuring the load voltage and indicating that the load is on (as he said), his load should be indeed on. If not, I would double check the wiring again
If there is voltage on the load terminals, and his load does not turn on, you should check the system.
It is a considerable voltage drop over the cable and probably on both my systems the batteries are getting old.
On the controller side the remaining issue is that it takes a while (time!) for the controller to
start charging the battery despite considerable drop in battery voltage.
There is plenty of solar power available to feed the consumers irrespective of the battery, but the voltage drop on the battery is so deep after -- say -- 30s of compressor running that the battery protection on the cooling box is triggered.
How to make the controller start using the available solar power sooner (timewise)?
I see the voltage drop in the reading in the app, nevertheless 75/10 remains in float for too long.
