ojeysky:


I am looking at the manual it's written 320vdc as the normal operating voltage but the attached picture reads 240vdc.

Irrespective am trying to understand what this means, does it mean that it is until I have sufficient number of panels in series totalling 240v that the stuff can work?

So if a solar panel Max PV is 32v I will need a least 8 panels before I can use this inverter?

pranil:


[quote author=pranil post=75874836]

The MPP solar mentions 120 to 450 V DC as MPPT range with ideal as 240 V DC for max efficiency and max 500 V DC

for series connection Min you need 120V / Vmpp of panel and max 500DC /Voc of panel - best combo is 250V DC/Vmpp of panel

Also take care when selecting fuses /breaker etc . They must be rated 250 or 600 V DC based on your final selection . may of them in market like midnight solar are rated only upto 150 V DC

kiekie1:


Welcome back Boss !

Guess i have few units of DC breakers with higher vdc ratings;

-100a 500vdc DCB "double pole"
-63a 500vdc DCB "double pole"
-63a 250vdc DCB "single pole"
-150a DCB "3 pole"

duwdu:


These specific inverters are designed to take advantage of high voltages while pushing relatively smaller currents. Even with two 500 VDC strings in parallel, not more than 30a protection should be needed, so I believe 63a+ breakers will never do the job or trip.

Do you or others have 15/30a variants?

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P34c3
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pranil:

Also take care when selecting fuses /breaker etc . They must be rated 250 or 600 V DC based on your final selection . may of them in market like midnight solar are rated only upto 150 V DC

duwdu:

Also, as with the PCM60x that I currently deploy (which I believe is essentially the CC built into these PIPs) — just as with most reputable CC's — the PIP is designed to wake up once the volt coming in from the PV array exceeds 48 VDC by a couple of volts, for a 48 V system. However, as already pointed out by pranil, it won't do MPPT until the array voltage hits 120-450.

duwdu:


In addition, ojeysky, I believe I read somewhere, probably in its own specific manual, that with the 3048 model (which is the specific one you'd indicated interest in,) works with 350 VDC max?

ojeysky:


Now I am wondering maybe I should get the MK series instead of the GK as it seem the GK high VOC seem not to be of great advantage? But my concern is that the 3kva MK series only does 1500W solar array while GK can allow me up to 4000W.



You are right, I saw it somewhere as well but it's stated up to 450 in the manual. I don't think I will have to get to 300VDC anyway so not a major concern for me.

Am sorry am not a solar guru, can you educate me on why you eventually went for the GK instead of the MK?


Thanks

zeestone99:


He probably went for gk cos of more panel capacity, as for me i wud hate to b limited to 1.5kw (mk series)

babniyen:
Good morning people. What's your take on 2V 500 AH or 1000AH gel batteries for Renewable Energy project.

HeartforGod:
Good-day house,

Am in need of 5kva 48V inverter with low idle power consumption (preferably hybrid inverter at a good price point). Kindly point me in the right direction.

foonshur:
please guys I need your opinion on this, can I hook up a HA02 48v battery balancer on 2 banks of 4 batteries each or I should get 2 balancers for the 2 banks?? thanks

kiekie1:


Hello, If cash isn't a major constraint , pls get 2 units ! If you want to DIY or manage , you can use 2.5mm flex cable to pair a balancer on your batt bank ! Cheer's

Janyves:
@Alejob....... I sent you a dm.I need info on your small lithium battery sales. Holla back

NiyiOmoIyunade:
I have a question for the electricity buffs in the house

I had raised a similar question previously - what do you think? Should Neutral and Earth ever be linked here in Nigeria (I believe our transformers are star/wye wound and the neutral wire center tapped - dunno if PHCN actually Earths their neutral wire at the transformer)

NiyiOmoIyunade:
I have a question for the electricity buffs in the house.

A friend is constructing an office complex and his electrical contractor wants to install an RCD/RCCB at the service entrance to protect the whole facility (all personnel and devices downstream of the RCD/RCCB)

In order to 'improve the speed at/certainty with which the RCD/RCCB could respond to a fault and disconnect the supply', he has already jumpered/connected the Neutral and Earth bus bars in the DB with a 16MM cable - this installation is here in Lekki - while I know this practice of linking Neutral and Earth is common practice in North America and even mandated by their electrical code, I am yet to see it done here in Nigeria.

I had raised a similar question previously - what do you think? Should Neutral and Earth ever be linked here in Nigeria (I believe our transformers are star/wye wound and the neutral wire center tapped - dunno if PHCN actually Earths their neutral wire at the transformer)

Does this practice help the performance of an RCD/RCCB in any way?

The office will also have solar power tied in(where I come in ) - I am struggling seriously with wiring the CC Earth terminal to that same Earth bus bar in the DB that already has an AC neutral connected to it.

NiyiOmoIyunade:
I have a question for the electricity buffs in the house.

A friend is constructing an office complex and his electrical contractor wants to install an RCD/RCCB at the service entrance to protect the whole facility (all personnel and devices downstream of the RCD/RCCB)

In order to 'improve the speed at/certainty with which the RCD/RCCB could respond to a fault and disconnect the supply', he has already jumpered/connected the Neutral and Earth bus bars in the DB with a 16MM cable - this installation is here in Lekki - while I know this practice of linking Neutral and Earth is common practice in North America and even mandated by their electrical code, I am yet to see it done here in Nigeria.

I had raised a similar question previously - what do you think? Should Neutral and Earth ever be linked here in Nigeria (I believe our transformers are star/wye wound and the neutral wire center tapped - dunno if PHCN actually Earths their neutral wire at the transformer)

Does this practice help the performance of an RCD/RCCB in any way?

The office will also have solar power tied in(where I come in ) - I am struggling seriously with wiring the CC Earth terminal to that same Earth bus bar in the DB that already has an AC neutral connected to it.

kiekie1:


Hello Sir, I have few units of 10a , 15a , 20a , 50a etc but not of higher VDC ratings ! Thanks

ojeysky:


Now I am wondering maybe I should get the MK series instead of the GK as it seem the GK high VOC seem not to be of great advantage? But my concern is that the 3kva MK series only does 1500W solar array while GK can allow me up to 4000W.

Am sorry am not a solar guru, can you educate me on why you eventually went for the GK instead of the MK?

Thanks

duwdu:


TBH, I'm not a guru either but hopefully the following will address why I chose the GK stable over the MK, as well as the high voltage thingy...

First of all, are you referring to the 48V model of the MK, or that you don't want to do 48V, or that it's not offered at 48V? I'll be surprised if any 48V unit is limited to 1500W, so please check again, you may just be good to go.

Having said that, my primary reason for going the GK route is the several advantages of deploying up to 450/500V DC when properly managed. Among these, are:
1. The charge controller portion should wake up earlier and retire later - gives more harvest/production time;
2. Much smaller gauge wire (so less set up cost) can be deployed over longer distances between the array and the inverter as the effect of the % drop in voltage will be negligible since voltages are quite high to begin with, giving better amps/yield;
3. Of course up to 5 KW of array at high voltage; this can be further optimized with up to 20 panels (250W @ 37 VoC each in a 10S2P config, for example) on just one inverter as I look to grow with it if its durability holds well.

Then there are other things mainly found in the GK series, especially the 5 KW model:
1. Support for Batteryless operation. (I consider this a major factor) ;
2. Detachable display/control panel - for wired remote operation up to 30m(?) away, IIRC;
3. Direct supply to load, even when battery is present; that way one bypasses the inefficiency associated with having to pass power through the battery first to the load even when sufficient solar/grid power is available to directly supply the load; (I don't think this is unique to the GK.)
4. BMS interface is already built in for Lithium batteries;
5. Bluetooth is built in;
6. WiFi interface is built in, although the WiFi Card itself is optional component, which I bought;
6. Latest technology & design from the Voltronic/MPP Solar stable, etc.

The main disadvantage I see with the 5 KW GK is that units cannot be parralled. They have to be used separately.

Hope those help a little.

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P34c3
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Trueigbo:
Good evening my people

Please what is difference Normal dry cell battery and wet cell battery. Which one is better

Trueigbo:
Good evening my people

Please what is difference Normal dry cell battery and wet cell battery