Hello,
I'm planning right now a Solar System as a island with power suport from the grid with following components
Victron Multipluss II 48/5000
MPPT Victron 150/100 MC4
Solarmodul 15 pieces Trina Solar 375WP MONO Halbzelle TSM-DE06M.08 (II)
3 rows 5 parallel connected
VENUS GX Raspberry Basis
EM24 Energy Meter DIN.AV.3.X.IS.X
at first is the 150/100 Mppt the right size for the Solar-panels !?
can i run the system at first to start without a batterie backup
Bye Andre
you have to have some battery to start the inverter and the MPPT.
your panels have a total power of 5625 Watts
now the OPEN circuit volts are of concern as you have not mentioned each panels OCV presuming 36 volts then 5 x 36 is 180 volts. BANG goes your MPPT controller, you need a 250/100
I would sugest a Cerbo instead of a venus, much newer unitr more powerfull more options for future you very similar costs
Thanks for the answer.
i was calculating the mppt with that https://www.victronenergy.de/mppt-calculator and it showed up that i need a 150/100 MPPT
i'm wondering why ???
if i Install at first one Phylontech with 2,4kw is the system then running and Turning the power that i need from the mppt direct into 220V of the house System
Yes it will do that if setup correctly.
anyway look at your Solar panels OCV string voltages in total for that string they must NOT exceed the Regs Rated value
15x 375 is 5625 so divide that by 3 we get 1875 per string then 5 in a string 1875/5 is 37.5 volts a panel
5 x 37.5 is 187V per String and thats the working voltage, the Open circuit will be higher maybe 40 or 42 volts
you must get a 250/100 MPPT unit, this should be fine for you
Hi @Andre12
I read your question as having 3x of those panels in series (a "row") and 5x paralleled. So '3S5P' we'd often call that. And it would work fine with a 150/100.
how do i calculate the V temp. coeff. [%/°C] and the I temp. coeff. [%/°C]
for the Trina module
Andre, Sorry about that. John is correct.
I was miss reading thinking 3 strings of 5 in series
however if you have 3 rows and 5 in parralle per row thats 1875 still per row and the total row voltage is 37.5 volts.
I presume you are then connecting these 3 rows into series so its 3 x 42 volts thats 126 volts. yes that will work.
I personally think that doing 5 in series then the 3 rows in parallel would be better as the string voltage total is higher and would give better output on overcast days.
but your call there
again sorry for the confusion on MY part
I have another Question.
I was reading about the factor one rule The max PV power must be equal or less than the VA rating of the inverter/charger
on this site https://www.victronenergy.com/live/ac_coupling:start#minimum_battery_capacity
should i install only at all 5000Wp Panels !?
That rule only applies to ac-coupled pv inverters. You'll have a dc-coupled charger, and it will be fine as you've described. (I'd prefer it that way).
If you have special needs though, best mention them before buying anything.
what happens to the Power i don't need, is the mppt stopping producing the power ?
Yes, it isn't harvested. The mpp is no longer tracked, and the panel V rises, at the extreme end approaching the Voc of the panels.
It is possible to export to grid, but this is much more complex, and usually requires an experienced local installer to sort the details.
