9.5.2. PV yield less than expected
Check the solar charger history in the VictronConnect App. Check the total maximum power (Pmax) for each day. Does this
match the array power?
To find the potential solar yield per day for a specific PV array size in a specific geographical location, use the MPPT sizing
calculator on the
solar charge controller product page.
These are some of the reasons why the array is generating less power than expected:
• Low sun angle, seasonal differences or morning/evening.
• Cloud cover or bad weather.
• Shading from trees or buildings.
• Dirty panels.
• Incorrect orientation and/or inclination.
• Broken or faulty solar panel(s).
• Issues with wiring, fuses, circuit breakers, wiring voltage drop.
• Bad splitters or combiners, or these are used in an incorrect way.
• Part of the PV array not working.
• PV array design issues.
• Solar array configuration mistakes.
• The batteries are too small, or getting older, and have a reduced capacity.
VictronConnect history Pmax
9.5.3. Full rated output not reached
There are a few reasons why the solar charger is not reaching its full rated output.
Some of these reasons have already been explained in the the chapter: “The batteries take too long to charge, are undercharged
or charge current less than expected”. Some additional reasons are explained in this paragraph.
PV array too small
If the PV array power rating is less than the solar charger nominal power rating, the solar charger cannot output more power than
the connected solar array can provide.
Temperature above 40°C
When the solar charger heats up, eventually the output current will derate. When the current is reduced naturally the output power
will reduce as well.
The controller is operational up to 60°C, with a full rated output up to 40°C.
In case the solar charger heats up quicker than expected, pay attention to the way it has been mounted. Mount it in such a way
that the generated heat can dissipate.
Ideally mount the solar charger on a vertical surface with the terminals facing downwards.
If the solar charger is located in a closed enclosure, such as a cabinet, make sure that cold air can enter and hot air can leave the
enclosure. Mount vents in the enclosure.
MPPT solar charger manual
Page 47
Troubleshooting and Support
