I have 4 20 watt Monocrystalline solar panels and 1 50 watt panel. Today before I installed the 50 watt solar panel I checked my voltage. I found that I get 173.9 volts and from the solar control it goes down to 27.6. My solar control is a PWM type. So how does this work. I was told that the batteries work best of they are charged at a slow rate but what about that loss of energy that is not used? Is it possible to connect a separate cable to use to charge the batteries and another one for powering up things? or should I invest in a MPPT solar controller?
This is my solar control.
http://hqrp.com/hqrp-12v-24v-10a-solar-charge-controller-regulator-10amp-with-battery-charger-monitor.html
Just because the volts change does not mean energy is lost. If the batteries are arranged for a 24 V system, the charging at about 27 Volts is good. Need to check amperage AND voltage for power. Also equations / conversions not the same for DC and AC.
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