sayeed of the road Posted June 17, 2021 Share Posted June 17, 2021 A sales man told me that when batteries are full and no current is required, solar panels stop producing volts. I thought the controller dumped excess energy as heat, but I'm very old. Have the laws of physics changed while I was asleep? Link to comment Share on other sites More sharing options...
Charles Posted June 17, 2021 Share Posted June 17, 2021 Nothing happens to it. Same as your house electric, if you don't use it, you don't use it. The solar controller switches the panel off in effect. Link to comment Share on other sites More sharing options...
Charles Posted June 17, 2021 Share Posted June 17, 2021 Some wind systems have to dump it into a dummy load.. Some get red hot 8-) Link to comment Share on other sites More sharing options...
sayeed of the road Posted June 17, 2021 Author Share Posted June 17, 2021 The solar controller switches the panel off in effect. So in blazing sunshine with a fully charged battery if you stuck a voltmeter across the panel would you see 0v? Link to comment Share on other sites More sharing options...
Steve928 Posted June 17, 2021 Share Posted June 17, 2021 sayeed of the road - 2021-06-17 6:47 PM So in blazing sunshine with a fully charged battery if you stuck a voltmeter across the panel would you see 0v? The controller will have disconnected the panel so you'd see its 'open circuit voltage' of around 22 to 23v. Link to comment Share on other sites More sharing options...
Yorkyrunner Posted June 18, 2021 Share Posted June 18, 2021 We used ours properly last weekend for the 1st time at the Peterboro dog show (sorry M/Home show) and it worked a treat with all that glorious weather. This weekend is going to be the test as we have not seen the sun today we have charged up laptop and tabs ,run Boom radio on inverter and even had heating and Tv on for a couple of hours. All off a 120 watt Solar panel and 2 75 amp batteries in paralell. So we will see! Link to comment Share on other sites More sharing options...
Charles Posted June 19, 2021 Share Posted June 19, 2021 Our 150w panel is well oversized for our usage. The battery is recharged by 10am if it's sunny. We have the TV on for about 4 hours in the evening, charge phones, LED lights and water pump. Link to comment Share on other sites More sharing options...
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