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Hi,
Why does the MPPT Sizing Calculator recommend an MPPT 150/45 here when an MPPT 100/50 ought to be sufficient? Is it that the calculator doesn't know about that model? I wish it explained its choices a bit more. Maybe there's another limit of the 100/50 that I'm not aware of.
https://mppt.victronenergy.com#djE7Y3VzdG9tLDIsMSwzNiwtMTAsNzAsMTIsOS41NCwwLjA2LDEwLjA4LDI5NSwzMC45MywtMC4zLDM3LjE4LDEwLDY=
Thanks,
Rob.
Not sure exactly what your system voltage is - there are two totally different figures on your linked page. If it is 12 you will be fine.
That being said the 100/50 does not do 36V system so that is most likely why it is not listed there. At least mine does not.
Hi Alexandra, thanks for your reply.
I don't know what that Battery Float voltage box means, but 36 is the lowest value it will accept, or else it turns red. The pop-up info for that input item says, "Used only for RS controllers" but I don't know what that means.
Interesting... at 338W (x2 in series) it recommends the 100/50, but at 337W (x2 in series) it recommends the 150/45, which is a much more expensive model. ¯\_(ツ)_/¯
Hi @DrRob
The calculator doesn't consider cost, it's technical only, and will derive the the lowest Amp output unit it considers suitable. If you can find more Amps cheaper, then good. But then you need to watch Volts if you choose more A and less V.
The RS units are for long pv strings (<450V) and 48V batteries only.
Thanks for explaining. It's a shame the calculator doesn't list all suitable units rather than the lowest amp output ones.
