Originally posted by kdog1982
reply to post by jaynkeel
That sounds great!
I think wind is a good backup also.
I purchased a durolast 12v,85 ah marine battery today,it is currently running this desktop computer and a 60 watt ( or equivalent to incandescent) florescent light ,which uses about 7 watts,the computer,about 70 watts.
I'm using my old inverter for now,it's 200 watt continuous,400 watt max .
I will now see how many hours I get out the battery till it dies,then see how many days it would take to recharge it with the solar panel.
My plan is to have more batteries in rotation.
edit on 13-11-2012 by kdog1982 because: (no reason given)
You could have done some math to save the trouble.
45 Watt solar panel charge
85 amp/hr battery, half is 42.5 amps
Consumed 77 Watts
5 hour battery drain time.....
I believe Watts divided by volts gives you amps.
77 Watts ÷ 12 volts = 6.416 amps
6.426 amps x 5 hours is 32.08 amps consumed in 5 hours.
You need to check your inverter safety shut off/alarm to see what voltage it starts beeping, because it might not be
exactly half drained, the safety is included to reduce battery damage and help prevent sulfation of your lead plates.
45 Watts...Charge rate ÷ 12volts= 2.5 amps
32.08÷2.5=12.832 hours of charge time. Just think you run your battery more dead and it will take two days to charge it. Two days charging versus 6 hours of run time or so. Also do nit forget about the charge controller consumption. It is usually minimal, but every Milli amp counts.
These numbers will vary due to inverter consumption, true voltage and amperage at charging, which depends on sunlight. And surges in consumption, such as a computer might u se more power while it is working harder.
With a little tweaking and figuring out your system you can regulate with accuracy how much you can consume versus how much you charge. For example my panels charge at 18 to 20 volts. My 10 Watt panel puts out. 55 amps at 19 volts or so.
Just thought I would share some information with you.
I monitor my battery voltage every 15 minutes or so when I run my inverter. The girlfriend thinks I am nuts, but I smile and say we got a light and radio don't we.
Tweek it and don't damage the battery. It wont hold a full charge if you do.
edit on 14-11-2012 by liejunkie01 because: phone spelling, sorry