Komsolar
New Member
Hi, I have put together system where I have two 100w 18v poly panels joined together in parallel, which is being controlled by a PMW 30 amp solar charger, feed into a 12v 105ah lead acid deep cycle battery. Hooked up to the battery I have a 1000w modified sine wave inverter. Plugged into the inverter I have a switch that switches from house ( grid) power 220v to inverter power ( 223v) when the house power cuts out in 0.20ms, (usually around 2.5 hours a time at least 3 times a day, some times its 4 hours long. In South Africa this is called load shedding and the government owned utility does this to prevent complete grid collapse, when they lose generating power capability due to generator failure due to poor maintenance of the grid and generators over the last 25 years). I'm running around 120 - 350 watts of alliances, (TV, Sound Bar, Android media box, router, fibre box and two 6w leds lights)off of the inverter. Generally the panels do a pretty good job at keeping the battery charged and can charge t fully in around 7 hours of sunlight, when we have around 2.5 hours power outage per day, but any more than that there is an issue. I put the transfer switch in to ensure that we ran off the inverter only during time of no grid power. Recently the inverter input voltage alarm is sounding (typically when the battery is near full charge), indicating voltage form the battery is above 15v and the inverter shuts down until the voltage from the battery comes under 15v.Surely the charge controller should not allow the battery to change above 14v? So gut feel is that there is a problem with the solar charge controller putting too high a voltage to the battery? does this sound right? I have ordered a Victron 75/15 bluetooth enabled solar charger which will come tomorrow. since the one I have his a cheap PWM 30 AMP one. Should I be leaving the system running permanently off the inverter and never on house power, as when I do this there is never the issue of over voltage coming frmm the battery? does anyone have any idea what the problem could be, id really appreciate advice . I'm just worried the battery will not fully charge using the PWM charger and that's why I have ordered the MPPT charger albeit its only 15Amp charger. please let me know any advice thanks