NewStats: 3,263,951 , 8,182,060 topics. Date: Monday, 09 June 2025 at 01:22 AM 4tl64

mank1234:


1-You need DC btw and inverter
2-You need AC btw utility and inverter
3-You don't need btw inverter and house except if distance from 2 above to your equipment is more than 10m and if it's more than that you need a finer type like socket type.

Edit: the distance above is length of wiring.

Thanks... this is what I was looking for... I was trying to know the exact number of Spd needed... now I know.

(1 Dc spd / 1 Ac spd)

mctfopt:



Yes, there's need for SPD with good earth. The two work together. SPD is voltage sensitive. Its resistance reduced sharply as voltage increase. You can imagine SPD as a gate and surge as flood. Under normal situation, the gate is shut but when seeing surge voltage coming, the gate quickly open so the surge can be diverted away from the equipment to the ground. It will automatically reset to high impedance status after the surge ends.

Ordinarily the resistance of the four major components (spark gap, Metal Oxide Varistor- MOV, Gas Discharge Tube- GDT and Transient Surge Suppressor-TVS) are so high under normal voltage but this resistance drops to zero or near zero to allow the surge current flow to the ground.


This YouTube video animation from ABB shows you the end of life behaviour of an MOV SPD behaviour in an AC circuit. The visuals depicts that the surge current flow path is through the earth (follow the flowing yellow line)

https://www.youtube.com/watch?v=tfXoOfipO08

we have SPD for DC and AC. All are there to protect the equipment from surge current.

Thanks alot! I appreciate your time in replying... the only problem I have is the right place to install the Spd - will just one DC surge be enough ( to CC) or should I include Ac Surge ( output of inverter and another one for input to inverter, making it 3 SPD on the system).

I will be Earthing the house on my own, as niyi explanation is clear enough.

bbally:


in the case of rented apartment that we can not dig to install a earthing. what can we do please?

Me I am looking for anwser too o.. especially this rainy season.

mctfopt:



I see I'm mentioned here, do you have a good earth, and thunder arrestor installed in the location?

I'm not too sure... with good Earthing, is there any need for spd? and if there's need for spd... where will be the best place to install it - I'm thinking the spd will be for just the and charge controller.

ceaser:


I believe this post by NiyiOmolyunade addresses some part of your inquiry.



By the way, I don't know how feasible a repair of the inverter might be. Except the company offers to replace the board, any other repairs by some random electronic/inverter technician may just be like wasting time.

If it's not so much, have you considered getting a new unit?

My technician said the inverter will work...

Do you suggest I earth the house and fix SPD for just the s or both the inverter input and output side?

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ojesymsym:
I am guessing you do not have proper earthing also?

Maybe... tenant na I be o

My inverter just got toast(burnt)from thunder... no surge protector.

I'm planning to fix the inverter and install surge protector...

What is the best way to install surge protector :

Between the Charge Controller and
Between the inverter Ac output and house load
Between the inverter Ac input (to charge the battery) and Nepa...

Please I would need your advice.

#Oga Niyi
# Oga Caesar
# Oga mctfopt
# The other Ogas

Easylearner:
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1. https://nairaland.unblockandhide.com/5567419/fraud-hentech-logistics-refuse-send#84670238

2. https://nairaland.unblockandhide.com/3430558/scam-alert-dont-victim-updates/88#84790751

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Can battery balancer be connected in parallel or advisable to get another battery balancer..

Chat 2...
Funlord please spy into this my pending case.

mcTrinity:


Hello Topmost11,

First of all, there's a general calculation used to determine the size of PV array for a particular system, and it has to do with using the average hours of sun in the day and other many scenario.

however, I'll show you how I personally do mine looo�.

secondly, I'll go the 24V way.....
so, for a 400Ah battery bank, you need a minimum charging current of 40A (10% of the battery bank capacity). However, some battery have exception to this: Quanta Amaron can take up to 25% of its capacity!

so at 40A charging current, you need 960W PV Array (i.e. 24V x 40A)

Nonetheless, there are other considerations like day loads, inefficiency, and cloudy moments....

if you decide to add 10A to take care of the day loads, you'll have 50A.

That'll be 1.2KW PV Array (i.e. 50A x 24V).

However, you should round it up to 1.5KW PV Array, to take care of inefficiency.

Note that the above is strictly my personal approach....

Cheers

what about i have solar 8 modules rating (250w, 30v, 9v) and is connected 4s2p to a charge controller of 150v/30A(pv rating) to a 400ah battery. Will this charge adequately?.

Note that the connection will give 120v/19amps(Mppt controller), difiling the c/10 rule but multiply amperage will still gives same watt that will let the connection be made in low wire ratings...

Hello leaders of our great forum..
Have being seeing lead battery DOD need to be 50% to save the battery... How can I cut of the battery supply when it get to 50%?... I thought charge controller also serve that purpose of cutting the battery flow..

Pharyn:
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which app can I used to draw a schematic (blueprint) like yours?
Thanks..

Have notice that is only victron cc that is very good for lithium batteries installation... cause of the easy way to regulate the cc to your desire voltage..

Mr mctfopt Good day sir!

1. Please if I have a 2kva/24v inverter and 12v/200ah batteries. What is the right breaker to put between the inverter and battery? Note the load to be powered is roughly 1500watts.

2. If I have 8 s of 250watts (9amps/36v) to be connect 2s4p, is it advisable to fuse each of the parallel string or a single mcb when all the parallel strings are connected?

3. What's your take of putting a breaker after the cc going to the battery (please note that a breaker is already before the cc)

Thanks.
I love satefy sir!

Pharyn:
Professional Delivery Guaranteed.

Call ElektroPhaim Solar!

/+2349099988770

see installation with safety guides everywhere....
The schematic you ed is not the whole installation guide...

Namzy:

Here an estimate

thank you..

Can anyone refer me to a table for wire sizing?

mctfopt:


You may really need to get the services of a professional to get this properly done. Anyways, a surge requires a good earth to work. Take a look at this YouTube video to see how it works.


https://www.youtube.com/watch?v=tfXoOfipO08

thanks alot

Easylearner:
I can't see any surge protector in the photo you ed, is it not needed or it's not on all system is been used?

thank you guys

mcTrinity:


Hi BT,

thanks ...and please,feel free

those are DC voltmeters... each battery bank has its own, hence two meters.

There is a PV Array Isolation circuit breaker inside the Plastic breaker box (white in color). it has to be turned off before unloading the CC (during switch over)

cheers

I can't see any surge protector in the photo you ed, is it not needed or it's not on all system is been used?

mctfopt:


I'll try to answer this as briefly as possible.

1: The circuit breaker size is dependent on what you are protecting. Eg use 125 percent of the continuous load (maximum current expected to last for three hours or more). For instance, if your maximum load current drawn is 10a, 125% of it is 12.5A, then in that application, you can use a 16A breaker.

2. Your surge rating is usually rated in kilo amps (kA). Because most SPDs on the market use a metal-oxide varistor (MOV), if a 10kA SPD experiences a 10kA surge, it means it'll use 100% of its capacity and will usually display red on the display window which means it is due for replacement. In the market, the higher the kA value of SPD, the higher the cost. So you can just go with either a 20kA capacity or 40kA. Ensure you have a good earth before installing an SPD.

3. You can still add a fuse if you can afford one. The more the protective device, the better your system. Just ensure it is rated accordingly so you don't overfuse (in which case the fuse won't melt on fault current) or under size(in which case the fuse constantly melts even when carrying the normal current).

4. It is not compulsory to use a battery balancer, but good ones which is adequately installed have proven to elongate battery lifespan. If you want to put one, ensure you do at the start of the installation and the battery is of the same make and age.

5. In theory, you can connect an infinite number of batteries in parallel. In practical, the more the number of batteries connected in parallel, the bigger the cross section of cables used to handle the higher amperage involved. So you can safely have more than three parallel as long as you obey the rule of the paralleling batteries and ensure the right size of cable is in use.

If you are in doubt, always check in with professionals around your area as it is never good to dabble in things of this nature which may be dangerous if not properly done.

Experts in the house are free to weigh in. I'm not an expert

mctfopt
Thanks alot...

For the spd, have seen online that is connected like a breaker but no off and on switch.. does it still need to be Connected to ground.

Good day everyone
Wanna ask some few questions...

How can I utilize this component correctly on a solar system

1. Mcb>> circuit breaker (do i need a circuit breaker when installing and if yes! How do i calculate for the correct rating and the right position to place it)

2. Spd>> Surge protector device ( How can i surge my device, the right way to do it and what determines the rating)

3. Fuse>> when a mcb is already integrated in a system can fuse still be used or the mcb act as a fuse...

4. Is it compulsory to use a battery balancer

5. When connecting a battery in parallel, what's the appropriate number that is idea to connect (i heard 3 column)

I'm asking before i burn my house or spoil the devices.