Reward for lost Kraken!
Join Date: Apr 2006
Thanked 132 Times in 129 Posts
Rep Power: 11
Re: Solar power ~ no more running the engine
"I know enough about these panels now to be dangerous"
Not yet but you're getting there.(G)
The voltage from the panels will vary with the load they are connected to, and a battery in different states of charge presents different loads. If the panels are small enough (compared to the battery capacity) you don't need a controller. But funny things happen, and a controller is cheap compared to new batteries or a fire. With nearly 300W of panels, you really want a controller. If you consider that an MPPT controller can give you 10% more power from your panels, ask yourself, what would an extra 30-40W panel cost you? Could you use that added power? If the answer is "yes", then an MPPT controller is worth buying. If you've got more power than you know what to do with, the answer is no.
Last edited by tdw; 07-24-2012 at 07:18 PM.
Reason: Typo - see my PM HS.