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Old 12-12-2012, 06:09 PM   #41
Site Team - Lou
Herk7769's Avatar
Join Date: Oct 2009
Location: South Eastern PA
Posts: 22,865
Originally Posted by apollumi View Post
[*]My brow wrinkles because I wonder why my lights dimmed a little after disconnecting main power[/LIST]
Solar to batteries: (by way of charge controller)
  • Battery takes charge
  • 12v devices work and battery takes charge
  • during good sunlight there is little draw on the battery and 12v devices work
  • I go to turn on my TV and bam! Nothing..!

Solar to batteries with charge controller and inverter connected to 110v bus:
  • All 12v works.
  • Moderate use of 110v devices works after turning on inverter.
  • I turn on on disco ball and my Bose 901 speakers and the sides of my batteries bow inward from the suction?

1) - "My brow wrinkles because I wonder why my lights dimmed a little after disconnecting main power"

When charging the battery there is 13 plus volts going to the system (it could be as high as 14 volts) in order to force those electrons into the lead plates. Removing shore power drops the voltage to "battery voltage" 12.7 or less.
Thus lights can dim some.

2) True - solar will give you the 13 volts plus you need to charge your battery.

False - "little draw on the battery" This totally depends on the load on your system. Running the slide out motor or water pump, for example, will pull nearly all the used power from the battery. The panels will then immediately start replacing what you used when you shut the motor off.

3) When using the inverter, nearly 100% of your consumed power will come from the battery. Again, the panels will replace that power as the demand drops and the power coming down from the panels becomes greater than the power demand on the battery.
Lou, Laura, & Freya the wonder dog
2008 GMC Sierra 3000HD Crewcab SB Allison Duramax
2019 Flagstaff 8529FLS - Pullrite 3300
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