idsolar:
just from experience breaker between cc & batr i think is by choice. i was calld upon to look at a fault on solar installatn & i met burnt cc. after measurement d only thing i noticed was d breaker. i changed cc, remove breaker, connect batr to cc wt thicker cable. up till today over 2yrs now no issue. observation: cc, breaker was properly sized. my take: never install something to avert a risk to create bigger risk. breaker between cc/batr is by choice.

battleaxe:


Why would it trip during a sunny time as you mentioned above?

I'm assuming it's because of an increased production I.e. Current at that point in time.

If your breaker is correctly sized at or above the rated capacity of your CC; why would you not want it to trip when it's seeing more current than its rated for?

That's its job! Again, if properly sized, the benefits to having a breaker there outweigh the possible risks to not having it there.

We sometimes may never be able to comprehend what damage those 6k items save us from!

N.B.: Note taken that if you have a breaker between your PV and combiner, it possibly should have tripped already based on your scenario above so CC should be all safe.

dicksonadams:
I have e great respect for Dmerciful the guy Na scholar

oneshowguy:
Long Battery the official vendor to Schneider electric has officially launched its batteries into nigeria at the just concluded power nigeria exhibition.
limited units of sample orders now available for your POC

Nominal Capacity: 12v 200Ah
80% DOD:550 cycles.
weight: 62kg
warranty:1 year

efuro:


thanx OGA Chris, the mppt has been installed & it is working fine.
thank you for the advice on cable gauge and breakers.
I appreciate you & sir frankee.

azz19:
pls I need some practical advise on how to protect one's system from the effects of lightning I heard it can destroy everything within few seconds.

azz19:

kindly help comment on this.
cc:kiekie1
battleaxe
Dmerciful

idsolar:
1. SUKAM 1.4KVA FOR SALE:
1.4kva sukam. 1yr 5month used. for sale due to upgrade.

2. solar charge controller (new). 12/24v 30amp.
call 08033735359 now

JohnKester:


I have the 300 liters mounted on my rooftop and centrally connected to all the bathrooms and kitchen! I can tell you that the water sometimes gets very hot and you have to be careful with the mixer so that your skin does not get scalded.

Imagine the cost of running gas cooker to boil hot water, or the cost to fuel the generator so your heaters can run. This is what I call green living. No need to worry about hot water except of course during those periods in the rainy season when it rains continuously for several days in a row.

Cheers

GeorgeD1:
guys,

just a page from the morningstar mppt 60 manual:

DMerciful:
Why will the CC short circuit?'its an advance technology remember! Its has inbuilt protection

bigrovar:
A properly designed system has layers of protection. Also remember protection priority is to first protect lives and property before protection equipment. Have *properly* sized breakers between each component of your off grid is highly recommended. CC are electrical component and even though they come built in with safety breakers.. It often recommended to have another breaker between pv and cc and cc and pv. If the battery were to get short circuited.. breaker protect the cc from battery. If cc short circuits (And it happens - google it) the breaker will protect the battery.

If the breaker between the cc and the battery trips (usually for a good reason) the worst thing is your cc is fried.

The alternative of not having a breaker between your cc and battery is, if cc short circuits.. then the recursion is much worse. Its like have the positives and negative of your battery in contact. Bad things happen.

bigrovar:
A properly designed system has layers of protection. Also remember protection priority is to first protect lives and property before protection equipment. Have *properly* sized breakers between each component of your off grid is highly recommended. CC are electrical component and even though they come built in with safety breakers.. It often recommended to have another breaker between pv and cc and cc and pv. If the battery were to get short circuited.. breaker protect the cc from battery. If cc short circuits (And it happens - google it) the breaker will protect the battery.

If the breaker between the cc and the battery trips (usually for a good reason) the worst thing is your cc is fried.

The alternative of not having a breaker between your cc and battery is, if cc short circuits.. then the recursion is much worse. Its like have the positives and negative of your battery in contact. Bad things happen.

GeorgeD1:
guys,

just a page from the morningstar mppt 60 manual:

DMerciful:
Upgraded my panels from 750W to 1000W.....gradually I'm getting there. Green for life

DMerciful:
Learnt something now...double pole breakers ensures the PV and battery are disconnected simultaneously thus avoiding d risk I mentioned earlier which is battery side tripping and PV side still energised. This makes more sense.

mank1234:


Please upload picture of an example of double pole breaker? I've been looking for it since and I'm confused if a DC breaker with +ve and -ve pole can be used in place by making positive pole for battery to inverter connection, negative pole for cc to solar array.

DMerciful:
Upgraded my panels from 750W to 1000W.....gradually I'm getting there. Green for life

DMerciful:
Double pole breakers are basically 2 breakers mechanically connected so they trip same time. So if one line of the PV circuit and one line of the battery circuit is connected to each breaker, they trip same time.

battleaxe:
Double pole breakers can be bought as is off the shelf. Not a regular item on the corner shop but you should be able to get if you ask around, maybe they buy it specially from you.

Dmerciful,
So if PV and battery are connected to either side of the DP breaker, where does the CC fit in? Thanks.

mank1234:


Thanks. How can I get the mechanical connector. I want to tie 2 2-pole circuit breaker together?

battleaxe:
Double pole breakers can be bought as is off the shelf. Not a regular item on the corner shop but you should be able to get if you ask around, maybe they buy it specially from you.

Dmerciful,
So if PV and battery are connected to either side of the DP breaker, where does the CC fit in? Thanks.

kiekie1:


Majority of 2 pole breakers are AC ... You can actually improvise by using ² DC breakers of same amperages.. Thanks !!

DMerciful:
Would you be kind enuf to tell us the difference?