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ice77 avatar image
ice77 asked

one RS450/200 or better split to 2x RS450/100

Hello guys,


i have a questrion regarding the purchase of RS450 equipment. Is it better to use only one RS450/200 or better split to 2x 450/100?


I was told, that it is better to use the 450/200, when various directions of the panels are used (N, S, E, W), because the 450/200 limits the output of the power over all 4 mppt trackers to 200. If 2x 450/100 are used, it could be that 2 mppts of the first 450/100 produce 120A and will be reduced to max 100A and the second produces 80A... so i can load only with 180A. When I use the 450/200 in the same constellation i would charge with 200A.


Is that true?


which setup would you advice?


Best regards


ice77

MPPT ControllersMultiplus-IIrs450
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4 Answers
Alexandra avatar image
Alexandra answered ·

@ice77

If you have a GX then the system co ordinates charge amps and each tracker will produce what it needs to to meet the demand.

You get 4 trackers if you get 2x450/100 or 450/200, so that is not a valid point. your 450/200 would track each tracker the same way anyway? If one array was receiving less irradiation it will produce less, that is the way of things in solar.

Install space is larger for two units as extra space needs to be given for heat there. So space may be a consideration; but two separate units is also an advantage to avoid unit heat derating.

It would also increase cabling costs slightly as the runs will be slightly longer since the spacing is necessary.

I am a person who does not like all the eggs in one basket, so to speak, if it was the only MPPT in my system (in larger systems with three to four it is less of an issue). So personally in the system I would use the 2x 450/100 option. (if I had space)

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nesswill avatar image nesswill commented ·
Yes i agree i have two 450/100 so if one failed i would still get 50% production where if i just had one 450/200 and it failed 0% production and as i am off grid i can not risk it.
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ice77 avatar image
ice77 answered ·

ah ok - so the 200A are not given over the sum of all 4 MPPT Trackers.

Did I understand right, that technically the 450/200 has no advanage ... no more options to get more power out of the 4 mppts.


To be honest, I did already buy 2x 450/100 but a friend of mine told me that I did an error buying 2 seperate units. He told me, that the 450/200 has the advantage that it sums up the power over 4mppts and there could be situations (how my example 120A and 80A oder 2 mppts) that the single 450/100 has to cut of to 100A and the 450/200 has the possibility to add 120 and 80A to 200 and does not need to cut of anything.

Only for this i was thinking about to send the new 450/100 back and buy an 450/200. Not for saving money ... only to get the better technical solution.


thank you so much for answering


ice77

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Alexandra avatar image Alexandra ♦ commented ·
450/100 can send 100A to the battery (actually I have seen mine over perform sometimes and do a bit more). So get your fusing to the recommended 125A.


A 450\200 can charge with 200A.

So basically 2 mppt units of 450/100 is the same as 450/200.... Just in two boxes not one.

No advantage to one unit. Each tracker tracks individually in both the 450/100 and the 450/200. So from that point no difference.

The datasheet says it all.

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Paul avatar image
Paul answered ·

Go for redundancy, always important!

I just had my MK3 programming cable dying on me within 14 months and now I'm stuck with programming my MP2 5000, grrr

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heuberg avatar image
heuberg answered ·

I think the main question has not been answered yet.
After all, the question was about the limitation of the output current.
Assuming that two strings deliver more than 2.88 kW each and these are both connected to a 450/100, this regulates down.
If these two strings were connected to a 450/200, the full power would be available.
Of course, the strings can also be routed to a 450/100 with a smaller or enders aligned string.

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Alexandra avatar image Alexandra ♦ commented ·

OP asked if ... 1 x 450/200 or 2x 450/100 would be better.

2 x 100A mppt charger does make 200A battery charging (if fully populated with panels). And the same number of trackers.

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