Pairing up the Eco-worthy 20a MPPT controller
Thanks to BFL confirming that the Eco-Worthy controller plays well when run with another controller, I felt pretty good about combining my two matched controllers. Each had one of the Bosch 245w mono ...
Forum Discussion
BFL13 wrote:
I love how they say "power gain" for those huge percentages of MPPT over PWM. No mention of "amps to the battery gain" which is not a lot. They do mention that it is amps that count though! Gottaluvit.
Also no mention of gains for when the battery is in the usual RV range during the day with solar on--between 13 and 14.4 volts. MPPT gain is best at around 12 volts and becomes (much) less over PWM as battery voltage rises into the 13-14.4v range.
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It's all hype and advertising. Mppt has its biggest advantage in a grid tied system where there is a load all of the time. In our case, it has a benefit under certain situations. Roy needs every amp he can get from a undersized system with limited sunlight, sounds like a candidate to me. Deal with cloudy conditions a lot would make you one too.
My system is over sized and normally we get more than enough sun. the only benefit I get is being able to run the ultra cheap high voltage panels I find. A Eco-w and a 24v panel makes a nice tidy package for not a lot of money if the panel fits and is big enough for your needs. At retail there could be a PWM system that cost less and still fills your needs as well.
So it still comes down to the panels. What can you afford out of what's available that fits on your roof and fills your needs. Now that you know what panels you have, you can pick the controller best suited to run them. This is when you consider if the extra cost of MPPT is worth it, not at the beginning.
