Choosing a solar charge controller/regulator
Why do you need a solar charge controller
- sunrise in the morning
- if the battery voltage droops below a defined voltage for more than a set time period, e.g 5 seconds (re-entry)
The difference between PWM and MPPT solar charge controllers
- With a PWM controller the current is drawn out of the panel at just above the battery voltage, whereas
- With an MPPT controller the current is drawn out of the panel at the panel “maximum power voltage” (think of an MPPT controller as being a “smart DC-DC converter”)
With a PWM controller the power drawn from the panel is 5.2A * 13V = 67.6 watts. This amount of power will be drawn regardless of the temperature of the panel, provided that the panel voltage remains above the battery voltage.
With an MPPT controller the power from the panel is 5.0A * 18V = 90 watts, i.e. 25% higher. However this is overly optimistic as the voltage drops as temperature increases; so assuming the panel temperature rises to say 30°C above the standard test conditions (STC) temperature of 25°C and the voltage drops by 4% for every 10°C, i.e. total of 12% then the power drawn by the MPPT will be 5A * 15.84V = 79.2W i.e. 17.2% more power than the PWM controller.
In summary there is an increase in energy harvesting with the MPPT controllers, but the percentage increase in harvesting varies significantly over the course of a day.
The differences in PWM and MPPT operation:
A PWM (pulse width modulation) controller can be thought of as an (electronic) switch between the solar panels and the battery:
- The switch is ON when the charger mode is in bulk charge mode
- The switch is “flicked” ON and OFF as needed (pulse width modulated) to hold the battery voltage at the absorption voltage
- The switch is OFF at the end of absorption while the battery voltage drops to the float voltage
- The switch is once again “flicked” ON and OFF as needed (pulse width modulated) to hold the battery voltage at the float voltage
The best panel match for a PWM controller:
The best panel match for a PWM controller is a panel with a voltage that is just sufficiently above that required for charging the battery and taking temperature into account, typically, a panel with a Vmp (maximum power voltage) of around 18V to charge a 12V battery. These are frequently referred to as a 12V panel even though they have a Vmp of around 18V.
The MPPT controller could be considered to be a “smart DC-DC converter”, i.e. it drops the panel voltage (hence “house panels” could be used) down to the voltage required to charge the battery. The current is increased in the same ratio as the voltage is dropped (ignoring heating losses in the electronics), just like a conventional step-down DC-DC converter.
The “smart” element in the DC-DC converter is the monitoring of the maximum power point of the panel which will vary during the day with the sun strength and angle, panel temperature, shading and panel(s) health. The “smarts” then adjusts the input voltage of the DC-DC converter – in “engineering speak” it provides a matched load to the panel.
- The panel open circuit voltage (Voc) must be under the permitted voltage.
- The Voc must be above the “start voltage” for the controller to “kick-in”
- The maximum panel short circuit current (Isc) must be within the range specified
- The maximum array wattage - some controllers allow this to be “over-sized”, e.g the Redarc Manager 30 is permitted to have up to 520W attached
Choosing the right option
Controllers are now available with a built-in bluetooth (e.g. Victron SmartSolar) to monitor your MPPT remotely by pairing it with a smartphone or other device.
Boost MPPT controllers
“Boost” MPPT charge controllers (e.g.Genasun) are also available. These allow batteries to be charged that have a higher voltage than the panel, eg charging a go
lf cart 48V battery from a “12V panel”.
Combined MPPT and DC-DC charger
The MPPT function is a natural adjunct to the DC-DC charger function and there are several quality brands that provide this with more under development.
A single unit can be used by itself as it automatically switches between alternator charging and solar charging. For larger systems, our favoured arrangement is to use a separate MPPT controller for the fixed roof mounted panels and use the combined MPPT/DC-DC with portable panels. In this case an Anderson connector is placed on the exterior of an RV which is then wired to the solar input of the MPPT/DC-DC unit.
Note that the battery capacity must be sufficient so that the combined charging current from simultaneous charging from the alternator and the roof solar panels does not exceed the manufacturers recommended maximum charging current.
Multiple solar chargers
Properly wired, it is possible to add multiple solar chargers (any combination of type and rating) to charge a battery. Proper wiring means that each solar charger is ideally wired separately and directly to the battery terminals. This ideal case means that each controller will “see” the battery voltage and is unaffected by the current flow coming from other charge controllers. The controllers will obviously not have identical charging characteristics and may have different settings; and they will charge according to their programmed characteristics. This situation is no different to charging a battery from the grid/generator at the same time as charging from solar. With modern controllers current will not flow backwards from the battery to the controller (excepting a very small quiescent current).
Cheap controllers may be marked as an MPPT but testing has shown that some are in fact PWM controllers.
Cheap controllers may not have the over-voltage battery protection which could result in the battery being overcharged with potential damage to the battery.