Solar Costs - MPPT vs PWM
The continued lower price of the larger panels has now dropped the MPPT costs just below PWM for a larger RV solar setup. SolarBlvd Cynergy 3x$200 250W panels 750W $600 SolarHome Morningstar MPPT ...
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AND just because you look at the output of a MPPT controller and see x amps, don't think that that is the max for the system. The controller also tries to determine what is the best way to charge the battery. Left alone the Eco-w's will take a slower, gentler rate but if I hit the system with running the coffee pot early on, I'll see a 2-3 amp increase and it will stay that way until the you hit around 14v or so. Then they go into boost until you reach the set voltage before dropping to float.
BFL
The Eco-w's go into absorb when they cross 14v or so and then float when they hit the set limit. The problem is at the 14-16a a 230w panel produces, it would take a huge bank to require any time to gain that voltage. So either we need to use a load to absorb some of the current or turn the panels so that they will not have the power to bring the voltage up so fast. Set it to 15v and derate the panel at 14.8v and you should be able to hold it there.
BFL
The Eco-w's go into absorb when they cross 14v or so and then float when they hit the set limit. The problem is at the 14-16a a 230w panel produces, it would take a huge bank to require any time to gain that voltage. So either we need to use a load to absorb some of the current or turn the panels so that they will not have the power to bring the voltage up so fast. Set it to 15v and derate the panel at 14.8v and you should be able to hold it there.
