Solar Charge Controller Choice, MPPT Versus PWM

Of late We have written about my personal own experience of setting up a solar-system on our own boat. We each and every have different reasons to consider installing the solar system, from simply wanting to keep our beginner battery topped upwards between visits, in order to our reason, in real time aboard boaters planning to reduce shore electric power usage.

From our own viewpoint, the greatest benefit comes when we go off-grid. Free electrical assistance for our leisure batteries.

The stage of this write-up is to help the reader select the proper solar controller intended for their own make use of. For your personal peace of thoughts focus on the basis that every photo voltaic setup requires the controller. Batteries happen to be expensive items plus don’t deserve to become damaged through emptying.

PWM charge controller A low-end charge controller is not really expensive and can ensure that your current battery is certainly not overcharged, and just because important, it is going to ensure that there is no back voltage to the solar panels when the screen is not really producing energy.

The two most typical charge controllers happen to be PWM (pulse width modulator) and MPPT (maximum power point tracking). Both have got their own features. Let us have got a look from both.

Cheap PULSE WIDTH MODULATION charge controllers actually are quite clever though not especially efficient. They are merely a high speed electronic switch. They will operate by fluttering on and off extremely swiftly and the speed regarding switching, controls the particular level of voltage delivered to typically the battery.

If you want to simply care for a basic battery when you are gone through the boat or RV, then a new small 15 or 20-watt panel feeling stimulated by way of a 10-amp PWM charge controller can do exactly what you desire. That same screen, without the control could easily affect your battery.

MPPT solar controllers however , are very clever and intensely efficient. They will be also higher priced compared to PWM’s. I’d like to place this into framework though. As a result of sizing of our ship we are minimal to only a number of leisure batteries.

These types of are Trojan T105 deep cycle power packs and currently they would cost around �500 to replace. Our own Victron MPPT 75/15 solar charge control cost less than a single battery. I have total trust in it and even know I can certainly trust it to squeeze every-last electron out of typically the panels without damaging the batteries.

The particular reader should always keep in mind that 12-volt solar energy panels will produce a lot more than 12 v in even reasonably bright weather. We have three solar solar panels within the boat’s roof top, and because MPPT definitely likes higher trouble we have wired these people in series.

Typically the thing is of which these ‘so called’ 12-volt panels create up to 22 volts each! Wiring typically the panels in series signifies that we are feeding as much as 66 (yes – sixty-six) volts into the charge controller. You may have seen the ’75/15′ within the name involving the Victron control mechanism.

It indicates that this particular controller is delighted to receive around 75 volts from the panels, and can happily produce upwards to 15 amps from the controller to the electric batteries! Briefly, the control mechanism converts panel volts from DC to AC. It then re-converts returning to POWER at the voltage the battery requires. Any excess ac electricity is converted to extra amps regarding the batteries!

This kind of controller is a fully fledged wise charger in their own righ