I have a Bouge 40A charge controller in Lithium 24v mode. What could cause it to show 100% charge at only 26.5 volts? yes I verified with a clamp meter it shows 26.6. It won't charge higher than 26.5. I have a Big Battery 24v 120ah mule with 3 200w panels with voc of 26v and 7.69a in series. I have a another panel to go to 2S2P later.