fikfik: My current installation:

5KVA CyberPower PRO
HIGH POWER 200 amp/10hr batts x 16
Joy Solar 260W Polycrystalline x 8
eTRACER 60 Amp MPPT Solar Charge controller

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earthrealm: sorry to raise this issue again...but on another forum some1 told me that my plan to use a 45amp mppt CC with my 250w x 4 24v solar panels on a 12v inverter/battery bank is not good..............that a lot of energy will be wasted at the CC since according to him my panel is 1kw/12v battery bank [since the CC has to down convert the 24v from the panels, to 12v] = 83amps...................and since my mppt CC is only 45amp...the excess 38amps will be wasted.................

I wasn't aware this is so..i tot since the panels are 24v and output 1kw...the max amperage produced will be about 45amps wch the CC has handle ok

pls gurus mek una come helep me o

tivta: George D. Abeg come oh. Am confused. I taught that no matter the rated output of a pv panel, it will give a max of 90percent power. If so 250*90percent=225watts. Therefore 225*4=900watts. That means 4 250watts is still ok right for a 80amp cc?
Pheleix pls correct me if am wrong.

pheleix:

(a) 12V system - 900/13.3333=67.5A

(b) 24V Sys - 900/2(13.3333)=33.75A

(c) 36V system - 900/3(13.3333)=22.5A

(d) 48V system - 900/4(13.3333)=16.88A
For all system you are clear with your your 80A CC

To know the PV limit (in Watts) of your system multiply the capacity of your CC with the average voltage of your system. E.g
For 12V system - 13.3333x80=1066 approx 1000W

For 48v system - 53.3332x80=4266 approx 4200W

tivta:

Thanks. My confussion is actually with the wattage of each pv panel. I mean am i right to assume that each pv panel will produce a maximum capacity of 90percent of its rated output or will it be higher or lower?

earthrealm: ok thanks guy for the info..i have 2 options now

1. use only 2units of my 250v 24v panels
or

2. upgrade my inverter/battery bank to a 24v system


the 3rd option of buying an 80amp cc isn't feasible now, cos of cash constraints.
my cc is morning star

earthrealm: sorry to raise this issue again...but on another forum some1 told me that my plan to use a 45amp mppt CC with my 250w x 4 24v solar panels on a 12v inverter/battery bank is not good..............that a lot of energy will be wasted at the CC since according to him my panel is 1kw/12v battery bank [since the CC has to down convert the 24v from the panels, to 12v] = 83amps...................and since my mppt CC is only 45amp...the excess 38amps will be wasted.................

I wasn't aware this is so..i tot since the panels are 24v and output 1kw...the max amperage produced will be about 45amps wch the CC has handle ok

pls gurus mek una come helep me o

earthrealm: ok thanks guy for the info..i have 2 options now

1. use only 2units of my 250v 24v panels
or

2. upgrade my inverter/battery bank to a 24v system


the 3rd option of buying an 80amp cc isn't feasible now, cos of cash constraints.
my cc is morning star

pheleix:
For now you can go with option 1. But option 2 is better. The lower the system voltage the higher the current on the wires and this causes heating and sometimes fire, hence lower voltage system will require bigger wires 16mm sq and above, and as you can see higher capacity of CC. But the higher system voltage the lower the current. For a system of 45A , 8-12mm will serve depending on the distances involved . Copper is expensive

earthrealm: thnks guys for the info.

@totalgreen..I think u made an error, using 3 units of the 250w panels will give me 750 watts...which is more than my cc can handle....yes its morning star mppt cc.

earthrealm: i understand now...the 24v 1200w is for a 24v battery bank/inverter sytem while the 12v 600w is for a 12v system..sadly that's where mine falls under

rodgers: just wondering. Is it possible to charge my battery with another inverter using the output from the first inverter. That both inverters are connected to same battery bank, while one is supplying, the other is used to recharge

George_D: totalgreen,

i doubt you'll find anyone here with such. in time past i tried to rally members to buy into a deal that would have
significantly lowered the cost of acquiring 6v 480ah trojans direct from the usa but nobody cared for it and the
deal fell through. it was the more reason i had to make do with the zenith batteries i have at the moment.

George_D: all,

after several months of diligent preparation. a couple of disappointments here and there,
i finally made it into the league of high end inverters with my latest upgrade works
over the weekend.

thanks to totalgreen who lent his invaluable assistance in acquiring all the dc breakers and
other accessories. i will always be grateful for his help as a brother indeed. Subscribed

right now, i'm still in the process of tidying up the installation.

more details coming soon!