Imax Charger

Posted on | October 22, 2008 | Comments Off

Imax Charger

will a 15v 52watt solar panel charge four 12c dv 55ah batteries?

I have made a 15v dc 52watt solar panel and I going to be trying to charger 4 12v dc 55ah batteries. I get about 6 hours of sun on my panel. Spec below, is that a big enough panel to charge the batteries???

I have 30 3x6 solar cells wired together Cell Specifications: (Watts): 1.75 Wp (Amps): 3.5 Imax (Volts): 0.5 V max which is where I got my 15g 52watt max (if math is wrong plz tell me) The Battery type: 12Volt 55.0ah NB Sealed Lead Acid Battery. I am using a mppt solar charger.

>will a 15v 52watt solar panel charge four 12c dv 55ah batteries?

Eventually. But the panel seems way undersized. Some rough calculations assuming you live in a nice sunny desert:

Under ideal conditions the mppt charger should supply about 4 amps into the 12 volt batteries. Lets say 70 hours to do a complete charge. Optimistically lets say you get half of that for 6 hours per day and don't use any power from the batteries.

(140 hours to charge)/(6 hours per day)= 23 days Actually it will be longer because the batteries have a self discharge rate and the charging isn't 100% effecent.

Another way to look at it is from a power standpoint.

(26 watts) X (6 hours per day) = 156 watt-hours per day. So maybe you can run a 26 watt (100 watt equivalent) CFL for 2-3 hours per day plus charge the batteries enough to make up for the self discharge rate of the batteries.

Of course, if you don't live in a nice sunny desert, the situation is worse. And even in nice sunny desert, things will be worse in the winter.

Info from your second question:
---------------------------------------------

Now has three 52 watt panels
Needs 12 volts at 93 amps to run all his equipment 12 hours per day.
671 amp-hr of 12 volt batteries
three 60 watt charge controlers
Located in PA, USA

OK, your equipment needs 1120 watts to operate (12 volts X 93 amps= 1116 watts)

That's 13.4 kWH per day or 402 kWH/month

Under ideal conditions your three 52 watt panels produce 156 watts. Figure 1/2 that under ideal conditions in PA.

1120 watts/ 78 watts = 14.4

In other words, you would need about 15 times as many panels to just directly operate your equipment on at noon on a sunny day in PA! That should give you an idea of how far off your calculations are.

There is a calculator at http://sunelec.com/index.php?main_page=page_2 for estimating how big a system you need. I punched your numbers in, it came back with a 4444 watt minimum system. Their 4500 watt system includes twenty two 205 watt solar panels. http://sunelec.com/index.php?main_page=4510_watt_off_grid_system

>OK here is my idea that i am in to far to back out

For this kind of project, you need professional guidance.

IMAX B6 5A Circuit Power Test

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