|
|
Post by TC on May 27, 2016 7:40:41 GMT -8
Hello,
My first time asking a question but first I would like to say what a excellant product you make. I made a mobile stand for my panel. In part shade it still keeps my battery fully charged.
Going all green in the backyard.
I would like to run a small submersable pump direct from the battery through a timmer relay.
Using the Ebb and flow method in my green house. Pump would come on 15 to 20 x per day then cut off. (10 to 20 seconds)
Is it bad to draw a load from the battery
Without the charge controller ?
1 100w with one 12 v battery with six 3w outdoor lights that are set on for 4 hours a night.
|
|
|
|
Post by Admin on May 27, 2016 11:17:16 GMT -8
Hello,
Yes you can connect the pump directly to the battery. Just make sure to connect the solar panel to a charge controller and not directly to the battery.
|
|
|
|
Post by spiderbob on May 31, 2016 8:18:27 GMT -8
One could better calculate what you need if we new what AH your battery is. Also the draw you intend to use. Are you using an inverter to power the pump or is it 12v? How many amps does your pump draw and how may amps does your light draw and whatever else you intend to use. The amount of power you can use, or take out of the batteries, is essentially only as much as the amount you can put into the batteries. Therefore the panels need to be capable to handle the charge to keep ahead of the amount drawn. One 12v battery can vary from 60AH to 140AH or more. Let me try to summarize, Appliances use amps to run, another unit is amp hours (AH) this refers to the number of amps the appliance uses when it is run for an hour. So, an appliance that uses three 4.5 amps (possibly your three lights) will use up 4.5 amp-hours when it runs for an hour. These amp hours will be drawn from the batteries, and the batteries, in turn, will look to the solar panels to recharge the amp hours they have forked over to the appliance. It is for this reason that you need to know how many amp-hours you will use in a typical day. Those amp hours must be replaced by the solar panel. so the size and number of panels you purchase will be determined by how many amp hours you use in a day. Most commonly it should be in your case I believe under or around the range of 70-90 AH in a day, if your pump is a 12v variety. The average 12v battery is usually rated in the 70-85AH range, remember you have to put more power back into the battery (usually 105-120% more) to obtain the "full charge" for the next day, don't forget cloudy days and/or shade. Add up your amps that will be using. I think you will be in a good range but without knowing this information, it's hard to tell.
|
|
