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> Solar Power Generation, for home use/sell back to tnb

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yushin
post May 27 2019, 07:13 PM

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QUOTE(newcomer9747 @ May 27 2019, 06:52 PM)
How much did you pay for the battery pack?
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which one? 50AH or 400AH?
newcomer9747
post May 27 2019, 09:53 PM

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QUOTE(yushin @ May 27 2019, 07:13 PM)
which one? 50AH or 400AH?
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Both?
yushin
post May 27 2019, 10:05 PM

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QUOTE(newcomer9747 @ May 27 2019, 09:53 PM)
Both?
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The 50AH about rm1600, 400AH about rm10k
All from Taobao.
Without Taobao I probably need to pay more than double for the same item...
Kiding
post May 27 2019, 10:50 PM

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QUOTE(ozak @ May 27 2019, 06:29 PM)
Guess not a grid tie inverter. So it is isolated from the grid (TNB).

Also can't fully utilize the panel to generate energy perday.

Unless the load is 100% of the panel capacity.
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if it is grid tied, excess energy could cause electricity bill goes higher, because some digital meter doesn't care the current flow, reverse flow of the energy to TNB doesn't reduce the consumption but increase it

There is a hybrid inverter with limiter in Taobao is able to detect when excess energy occurs, it will reduce the solar panel output.
ozak
post May 28 2019, 10:12 AM

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QUOTE(Kiding @ May 27 2019, 10:50 PM)
if it is grid tied, excess energy could cause electricity bill goes higher, because some digital meter doesn't care the current flow, reverse flow of the energy to TNB doesn't reduce the consumption but increase it

There is a hybrid inverter with limiter in Taobao is able to detect when excess energy occurs, it will reduce the solar panel output.
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Grid tie doesn't mean have to feed back to TNB. But own use. If own consumption is higher than the panel supply, it will not feed back to TNB. But with panel additional supply, TNB meter is running slower. (cheaper bill)

It is a waste if doesn't fully uitlize the panel output. It is not a free energy with the upfront invest on it and have a lifetime.

Got to find a way how to channel such energy to fully use it.

I think yushin inverter is ok if the load is high. Depend on how the inverter program to do the switching supply between TNB and panel output.
Kiding
post May 28 2019, 11:13 AM

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QUOTE(ozak @ May 28 2019, 10:12 AM)
Grid tie doesn't mean have to feed back to TNB. But own use. If own consumption is higher than the panel supply, it will not feed back to TNB. But with panel additional supply, TNB meter is running slower. (cheaper bill)

It is a waste if doesn't fully uitlize the panel output. It is not a free energy with the upfront invest on it and have a lifetime.

Got to find a way how to channel such energy to fully use it.

I think yushin inverter is ok if the load is high. Depend on how the inverter program to do the switching supply between TNB and panel output.
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Grid tie means it is tied to the power grid, if the solar panel output is higher than consumption, excess power will go back to power grid which is TNB, and some digital meter does not care the current flow, the meter always increase its KWH value even the current is reverse flow to TNB.
yushin
post May 28 2019, 02:21 PM

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QUOTE(Kiding @ May 28 2019, 11:13 AM)
Grid tie means it is tied to the power grid, if the solar panel output is higher than consumption, excess power will go back to power grid which is TNB, and some digital meter does not care the current flow, the meter always increase its KWH value even the current is reverse flow to TNB.
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Hmm, if a solar system uses TNB as a backup power source, what should it be called?
"Grid as backup"?
Kiding
post May 28 2019, 02:56 PM

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QUOTE(yushin @ May 28 2019, 02:21 PM)
Hmm, if a solar system uses TNB as a backup power source, what should it be called?
"Grid as backup"?
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hybrid solar systems

https://energyinformative.org/grid-tied-off...-solar-systems/
yushin
post Jun 3 2019, 08:43 PM

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Dunno in fits here or not...
This is the most beautiful active BMS for lithium storage battery I've seen. With screen output.
User manual also the longest, 53 pages.
I gonna have some fun when the cells arrives. brows.gif

controller module
user posted image
battery summary info
user posted image
individual cell info, also where which cell is undergoing balancing
user posted image
yushin
post Jun 19 2019, 09:45 PM

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My 400ah battery has arrived. No issues. rclxm9.gif
All betteries are test and matched by the seller.
400ah battery vs 18650 3400mah lithium ion battery beside.

Attached Image

This post has been edited by yushin: Jun 19 2019, 09:46 PM
birain
post Jun 24 2019, 11:30 PM

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how much watt does a typical Malaysian double story link house uses? do we convert all those tv, fans, lights to DC?
Two5Kid
post Jun 25 2019, 04:30 PM

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QUOTE(birain @ Jun 24 2019, 11:30 PM)
how much watt does a typical Malaysian double story link house uses? do we convert all those tv, fans, lights to DC?
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You can check your electricity bill, it will state there. Even the solar companies will ask for a copy of your bill. If you are not staying there, just use your current bill and guesstimate.
birain
post Jun 26 2019, 05:14 PM

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QUOTE(Two5Kid @ Jun 25 2019, 04:30 PM)
You can check your electricity bill, it will state there. Even the solar companies will ask for a copy of your bill. If you are not staying there, just use your current bill and guesstimate.
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so we just follow what the bill printed and source the solar wattage accordingly? can we just count what appliances wattage we use and add it up? confused.gif
ozak
post Jun 27 2019, 09:32 AM

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QUOTE(yushin @ Jun 3 2019, 08:43 PM)
Dunno in fits here or not...
This is the most beautiful active BMS for lithium storage battery I've seen. With screen output.
User manual also the longest, 53 pages.
I gonna have some fun when the cells arrives.  brows.gif

controller module
user posted image
battery summary info
user posted image
individual cell info, also where which cell is undergoing balancing
user posted image
*
This wan just a balancer or with protection also ?

What is the balancing Amp ?

Can balance 7s?

English version ada? smile.gif
ozak
post Jun 27 2019, 09:40 AM

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QUOTE(yushin @ Jun 19 2019, 09:45 PM)
My 400ah battery has arrived. No issues.  rclxm9.gif
All betteries are test and matched by the seller.
400ah battery vs 18650 3400mah lithium ion battery beside.

Attached Image
*
48v total in series ? 400ah perbattery?

That battery is big capacity ! shakehead.gif
-oc-gassa
post Jun 27 2019, 10:08 AM

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guys.. im totally not in this field (far from it).. but really amaze of what Solar power output today.. compare to last 10 years...

for offgrid how do we calculate
1. Solar panel (watt per panel)
2. number of kw inverter
3. how many AH Battery

assume monthly energy consumption 300kWh

roughly the cost for this setup around RM10-15K?
Two5Kid
post Jun 27 2019, 10:30 AM

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QUOTE(birain @ Jun 26 2019, 05:14 PM)
so we just follow what the bill printed and source the solar wattage accordingly? can we just count what appliances wattage we use and add it up? confused.gif
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Not so easy to add all your appliances, because of a few factors:

1) hours of usage may vary day to day, season to season
2) you might also change your appliances over the years
3) you might add new appliances too

As for following your bill, it is far from perfect too, as it also depends on your usage that month, but you could get, say maybe 6 backdated bills and average out the usage. To estimate the solar power, you cannot buy the exact amount as shown on your bill, as the solar panels do not charge at 100%, I would say you need to add another 25% on top of the monthly bill. And solar panels will depreciate its power over the years, so your 5kw system could be only 3kw after 10 years.

Are you planning on an off-grid system? If yes, you still need to find a big enough battery to store all this power.
Two5Kid
post Jun 27 2019, 10:45 AM

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QUOTE(-oc-gassa @ Jun 27 2019, 10:08 AM)
guys.. im totally not in this field (far from it).. but really amaze of what Solar power output today.. compare to last 10 years...

for offgrid how do we calculate
1. Solar panel (watt per panel)
You need to source the panels online, see how much they generate per panel, how big your roof size is, where is the location of the sun, how many hours of good sunlight per day can you get, what if it rains/cloudy on that day or that week, how are you getting backup power during those times? Then you need to count the number of appliances and your average electricity bill, add on the extra usage, solar panels also don't generate 100%, the conversion from AC to DC will lose some, so it's really complicated to go off grid but not impossible.

2. number of kw inverter
This I think depends on your setup. One inverter versus multiple inverters, one for each panel.

3. how many AH Battery
This also will need to count based on Question No.1 and it is by far the most expensive part of the system if you intend on using good batteries unless you know how to cobble together multiple small used batteries and build your own. In my experience, it was half the total amount.

assume monthly energy consumption 300kWh
This would give you an average of say 10kWh per day, with efficient sunlight around 3.5 hours to 4, that means you need at least a 3kW system, give and take some extras and what not, I would say you need 4kw and above. More if you plan on using it long term as the panels depreciate power with time. If 4kW system and you get a 250w panel, you need 16 panels. For battery, you need to be able to store at least 10-12kw or more (4kW x hours of sunlight) so that you can use it at night.

roughly the cost for this setup around RM10-15K? 4 times that amount or maybe higher. Under the new government scheme, 4kW=RM26000 (without battery). It can be cheaper if you can buy your own solar panels, fixed it yourself, do all the cabling and inverters yourself but I don't think it will be within what you budgeted.
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yushin
post Jun 27 2019, 11:45 AM

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QUOTE(ozak @ Jun 27 2019, 09:32 AM)
This wan just a balancer or with protection also ?

What is the balancing Amp ?

Can balance 7s?

English version ada?  smile.gif
*
This thing do balancing by dissipating extra power away. No active balancing.
Mininum cell to connect to the battery control board is 3 so 7s would work.
Yes, got english version. The chip with english firmware is on the way.

My review after one week using it.
Pro
1) Beautiful screen with detail info on each cell.
2) Has current shunt to calculate power in and out in AH.
3) Has many temperature probe. Not useful in Malaysia tho.
4) Can connect relay to cut off power
5) Can connect to multiple battery management board. 1 master board + many battery board (The board with lots of big resistors)
6) Has english version
7) Seller knows a lot about the product.
Cons
1) The bluetooth module and screen driver not stable and half broke. Parts in on the way and cheap (rmb20).
2) Cannot do active balance. Only do balance by dissipating power. Wasted precious solar energy!!!
3) Lots of wire and assembly to so. Difficult for user without proper tooling.

Now I am testing another product that can do active and passive balancing...
user posted image
user posted image
user posted image
user posted image
yushin
post Jun 27 2019, 12:02 PM

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QUOTE(ozak @ Jun 27 2019, 09:40 AM)
48v total in series ? 400ah perbattery?

That battery is big capacity !  shakehead.gif
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48v in series. 400AH each. Actual capacity is 430ah.
Yes, really big and heavy. Still much lighter than equivalent usable capacity deep discharge lead acid by half.
Enough to run 1hp aircond for 20 hours.

This post has been edited by yushin: Jun 27 2019, 12:03 PM

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