Hi got another daft question. I have got a shed with a solar panel charging up a 200ah battery (12v) battery just lately i have been using a 12v heater in their as well trouble is with the heater on the power drains much quicker and i run out of light and heat. I have two 65ah bike batteries i would like to link up to to get more time could i put a resister between the positives so it would slow the charge\discharge of the battery's? i used a 12v 10w light bulb between the positives today but have disconnected it before the sun starts charging them tomorrow. Thank you for your time