NewStats: 3,264,413 , 8,183,656 topics. Date: Wednesday, 11 June 2025 at 12:20 AM v2g1c

Rumplesteelskin:
I made a post here yesterday and was banned for some reason. I’ve been a silent reader and follower of this thread, thanks to HeavenlyBang. Kudos to y'all!

The Haisic 8 kWh battery caught my attention based on the discussions here, so I decided to give it a try. My experience has been mixed. Bottom line: the unit I got might be faulty. It doesn’t charge above 26.8V, which gives me access to only about 60% of its capacity.

I'm in the process of returning it after a series of tests. I'm making this post to share my experience and advise anyone interested to pause and, if possible, have the unit fully tested before making a purchase.

I’ll update the thread as I make progress.

Please enlighten us further. Does the BMS cut at 26.8v while charging or what?

Rumplesteelskin:
I made a post here yesterday and was banned for some reason. I’ve been a silent reader and follower of this thread, thanks to HeavenlyBang. Kudos to y'all!

The Haisic 8 kWh battery caught my attention based on the discussions here, so I decided to give it a try. My experience has been mixed. Bottom line: the unit I got might be faulty. It doesn’t charge above 26.8V, which gives me access to only about 60% of its capacity.

I'm in the process of returning it after a series of tests. I'm making this post to share my experience and advise anyone interested to pause and, if possible, have the unit fully tested before making a purchase.

I’ll update the thread as I make progress.

This is one of the reason why a communicative BMS is important or at least a screen that allows us to monitor cell voltage.

Good price, but Haisic are being too secretive.

Thanks a lot for sharing.

ManAdii:

Senior man you sabi the inverter. No lie here. Very very solid. I used the 1.2kva variant before upgrading to 3kw. It's very rugged. No fear of short circuit, lighting, reverse polarity, over/under voltage etc... it has all those protections. I have tested it.

Na valto introduce me to tbb as far back as Jan 2022, I have installed over 15 units of their old inverters

ManAdii:

Please enlighten us further. Does the BMS cut at 26.8v while charging or what?

Yes, that’s what all my tests are pointing to.

For context: Before the Haisic battery arrived, I was using a custom-built lithium battery with my 3kVA hybrid inverter and 24V solar setup. With eight 200W solar s on the roof, I could charge the battery from 24V in the morning to 29.2V by 1–3 PM, depending on sunlight.

The Haisic arrived and got stuck at 27.2V on day one. I initially thought the issue was charging current. My inverter s 30A for AC charging, the charge controller is rated 60A, and the battery’s recommended charge current is 40A. So, I ruled out current as the problem.

Did a drain test, still stuck at 26.8-27.2 V after hours of charging. Did the final test today, disconnected the inverter from the battery, and the inverter went straight to 29.1 V, while the charge controller that is connected to the battery shows 26.8 V. So, I have ruled out the inverter limiting the charge current.

My guess is either the BMS is faulty or one or more cells are weak. Order the Coulomb meter posted here a few threads back, but it will take 3 weeks to get to me.

ManAdii:

Senior man you sabi the inverter. No lie here. Very very solid. I used the 1.2kva variant before upgrading to 3kw. It's very rugged. No fear of short circuit, lighting , reverse polarity, over/under voltage etc... it has all those protections. I have tested it.

You tested lighting

AndroBlaze:


This is one of the reason why a communicative BMS is important or at least a screen that allows us to monitor cell voltage.

Good price, but Haisic are being too secretive.

Thanks a lot for sharing.

Yeah, I totally agree. That screen is very important but the price was crazy, even got a better deal at #790k. The 5000 plus kWh capacity left for me to use did wonders, but I need the full capacity, that is why I needed it in the first place.

GloryJoyeux:


Hi,

CAN to USB

The disadvantage of using CAN is that it doesn’t show individual cell voltages or temperature, and it shows all paralleled batteries as one battery.

https://solar-assistant.io/shop/products/can_self

Same as the LIB R485, Thanks

buyAride:


Thank you for this education, it is truly appreciated.
I want you to please, shed more light on the bolded parts of your Post.

From what l understand in your post, the Inverter is sized such that it is a minimum of 1.3 x Maximum daily Power Consumption.
If the above is true, using your example of a 15Kw, maximum daily Power consumption,
does it not mean that the size of the inverter should be 1.3 x 15Kw = 19.5 or 20KW Inverter will be appropriate.

but your analysis said 4kW Inverter.

In the additional Capacity example too, where max. daily Load increased to 20KW, the Inverter recommendation was 7KW Inverter (instead of 1.3 x 20KW = 26 (or 25KW) Inverter..

I already alluded this to mis-typing but wanted to be sure, by asking you directly, so l dont get confused.
Thank you.

From his explanation for the inverter sizing.

You're multiplying the total load wattage of all your appliances when used together by 1.33. That is, when you have everything that uses power on, the total multiplied by 1.3.
This is W X 1.3 for inverter

This is different from the total used in the entire day which is Wh (watt hour).
Wh X 1.3 for battery

Rumplesteelskin:




Did a drain test, still stuck at 26.8-27.2 V after hours of charging. Did the final test today, disconnected the inverter from the battery, and the inverter went straight to 29.1 V, while the charge controller that is connected to the battery shows 26.8 V. So, I have ruled out the inverter limiting the charge current

What was the charging current at that 26.8v?

Rumplesteelskin:
I made a post here yesterday and was banned for some reason. I’ve been a silent reader and follower of this thread, thanks to HeavenlyBang. Kudos to y'all!

The Haisic 8 kWh battery caught my attention based on the discussions here, so I decided to give it a try. My experience has been mixed. Bottom line: the unit I got might be faulty. It doesn’t charge above 26.8V, which gives me access to only about 60% of its capacity.

I'm in the process of returning it after a series of tests. I'm making this post to share my experience and advise anyone interested to pause and, if possible, have the unit fully tested before making a purchase.

I’ll update the thread as I make progress.

I had same issue when I got my Haisic 3.6kwh battery. The issue as very simple. Bms was limiting charge.

Drain till bms LVD and that’s it. Charge as normal and your issue is over.

Rumplesteelskin:


Yes, that’s what all my tests are pointing to.

For context: Before the Haisic battery arrived, I was using a custom-built lithium battery with my 3kVA hybrid inverter and 24V solar setup. With eight 200W solar s on the roof, I could charge the battery from 24V in the morning to 29.2V by 1–3 PM, depending on sunlight.

The Haisic arrived and got stuck at 27.2V on day one. I initially thought the issue was charging current. My inverter s 30A for AC charging, the charge controller is rated 60A, and the battery’s recommended charge current is 40A. So, I ruled out current as the problem.

Did a drain test, still stuck at 26.8-27.2 V after hours of charging. Did the final test today, disconnected the inverter from the battery, and the inverter went straight to 29.1 V, while the charge controller that is connected to the battery shows 26.8 V. So, I have ruled out the inverter limiting the charge current.

My guess is either the BMS is faulty or one or more cells are weak. Order the Coulomb meter posted here a few threads back, but it will take 3 weeks to get to me.

and your 8 pcs of 200w battery is not enough to charge that battery bro. You have a huge capacity battery there. You need more than 2300w of pv to comfortably charge the battery and carry your loads.

fuckboys:
I had same issue when I got my Haisic 3.6kwh battery. The issue as very simple. Bms was limiting charge.

Drain till bms LVD and that’s it. Charge as normal and your issue is over.

Quite interesting.

Was this fix suggested to you or something you stumbled upon while using the battery?

mctfopt:


What was the charging current at that 26.8v?

For PV under 32A, for grid and Gen 30A.

fuckboys:
I had same issue when I got my Haisic 3.6kwh battery. The issue as very simple. Bms was limiting charge.

Drain till bms LVD and that’s it. Charge as normal and your issue is over.

I did this earlier today hoping it will reset the BMS but it changes nothing. For over 6 hours now it won't get over 26.8 - 27.2v. My inverter hasn't indicated that the battery is full, still blinking the charging light.

AndroBlaze:


Quite interesting.

Was this fix suggested to you or something you stumbled upon while using the battery?

it was suggested to me on this same thread by someone, tried it and it worked perfectly.

Before that it use to limit charging to 13.4 but now i charge to 14.6 everyday.

Rumplesteelskin:


For PV under 32A, for grid and Gen 30A.



I did this earlier today hoping it will reset the BMS but it changes nothing. For over 6 hours now it won't get over 26.8 - 27.2v. My inverter hasn't indicated that the battery is full, still blinking the charging light.

i mean bms LVD not your inverter LVD. I had to turn of lvd on my inverter to achieve it that day.

fuckboys:
and your 8 pcs of 200w battery is not enough to charge that battery bro. You have a huge capacity battery there. You need more than 2300w of pv to comfortably charge the battery and carry your loads.

None of the power source is even charging it above range I mentioned earlier, and that same solar set up was charging my other battery with no issue.

fuckboys:
i mean bms LVD not your inverter LVD. I had to turn of lvd on my inverter to achieve it that day.

How can I do that, please?

Rumplesteelskin:


How can I do that, please?

there's always gonna be a difference between your inverter reading of your battery voltage and the true battery voltage itself.

I had 5v disparity between my inverter reading and actual battery voltage. Inverter reading was higher by 5v compared to actual battery voltage.

You'll need a multimeter to get the actual battery voltage and check the difference with your inverter battery voltage. Then set your inveter by adding the difference in values to settings in your inverter.


I'm saying all these cos I'm 💯 certain you haven't hit bms LVD to activate that bms during your testing.

The same way there are not many 24v 5kva inverter. Anyone with a need for such battery capacity will be better off using a 48v system. You will save on cable and won't be stressing your inverter and battery unnecessarily.

HeavenlyBang:


Damn, I don't think anyone else is making 24v in these capacities.

Rumplesteelskin:
I made a post here yesterday and was banned for some reason. I’ve been a silent reader and follower of this thread, thanks to HeavenlyBang. Kudos to y'all!

The Haisic 8 kWh battery caught my attention based on the discussions here, so I decided to give it a try. My experience has been mixed. Bottom line: the unit I got might be faulty. It doesn’t charge above 26.8V, which gives me access to only about 60% of its capacity.

I'm in the process of returning it after a series of tests. I'm making this post to share my experience and advise anyone interested to pause and, if possible, have the unit fully tested before making a purchase.

I’ll update the thread as I make progress.

I'm experiencing this same thing with my battery!
I just brought it home to test again today and see if it's an issue with my office setup.

fuckboys:
I had same issue when I got my Haisic 3.6kwh battery. The issue as very simple. Bms was limiting charge.

Drain till bms LVD and that’s it. Charge as normal and your issue is over.

Ehn ehn!
If this solves it, I go they happy.
I don they think about how I wan take fix this issue.

HeavenlyBang:


Damn, I don't think anyone else is making 24v in these capacities.

Must be on special demand only.
Such size with 24v will require high amps to charge it and it's hard to get a charge controller of such. To get 4kw from sun you'll need about 200a charger, something that on 48v you'll get with simple 100a charger.
That's why 48v is better for those big batteries.
But there must be people who just want them like that and he will give them what they want.

omotoda:


Haisic has 24v 280ah for 800k but its not with smart BMS.Youc an talk to @valtoand @Mr reed to build a 5kw for you but with less than million naira , you can conveniently get a 7kw 24v with smart BMS from @MrReed.I dont know the current price for @valto

Is there a 12v 280ah?

ask4bk:

Is there a 12v 280ah?

Yes. That's their 4kw battery that Dam5reey tested earlier which was actually 3.6kw.

bkuranga:


Ehn ehn!
If this solves it, I go they happy.
I don they think about how I wan take fix this issue.

All of una wey de buy Haisic on the lowkey should speak up oooo.

At the price point, it has turned to the battery everyone is recommending. But it should be testimonies we should be using to recommend things on here, so the more info, the better.

fuckboys:
there's always gonna be a difference between your inverter reading of your battery voltage and the true battery voltage itself.

I had 5v disparity between my inverter reading and actual battery voltage. Inverter reading was higher by 5v compared to actual battery voltage.

You'll need a multimeter to get the actual battery voltage and check the difference with your inverter battery voltage. Then set your inveter by adding the difference in values to settings in your inverter.


I'm saying all these cos I'm 💯 certain you haven't hit bms LVD to activate that bms during your testing.

Will look into this. Thank you.

bkuranga:



I'm experiencing this same thing with my battery!
I just brought it home to test again today and see if it's an issue with my office setup.

Let us know how it goes with the test.

Rumplesteelskin:


How can I do that, please?

Simply put, if there is a way to temporarily switch off your inverter's LVD or temporarily change it to something as low as 20.5v, do it.

What you want is your battery to turn off and shut down by itself, which the BMS should do before the voltage gets less than 21v.

Also ensure you switch of your PV array from the breaker if you are using a separate controller.

If I were you, I'd do the test in a controlled setting. I'd allow the inverter's LVD to turn it off the way it normally does. Then prepare myself to switch it back on after a few mins or so once the voltage has slightly gone up and immediately change the LVD on the inverter to 20.5v. Put a heavy load on the system and within another few minutes the BMS would have turned off the battery and obviously the inverter.

You'd also need to factor that there needs to be another power source available to power on the inverter so you can wake up the battery and charge it, or you have a separate smart 24v charger available (easiest method).

I've actually used something as small as a transistor radio battery to power up a controller that died when their was no NEPA available and the BMS had shut the battery off for a 12v system earlier. So don't be scared, just be prepared.

Penuelseun:
Finally got the TBB 6kva 48v last week and so far so good, experience has been great

Let me bring wire to your house

oloet:

Let me bring wire to your house

Hahaha, bring it o

AndroBlaze:


Simply put, if there is a way to temporarily switch off your inverter's LVD or temporarily change it to something as low as 20.5v, do it.

What you want is your battery to turn off and shut down by itself, which the BMS should do before the voltage gets less than 21v.

Also ensure you switch of your PV array from the breaker if you are using a separate controller.

If I were you, I'd do the test in a controlled setting. I'd allow the inverter's LVD to turn it off the way it normally does. Then prepare myself to switch it back on after a few mins or so once the voltage has slightly gone up and immediately change the LVD on the inverter to 20.5v. Put a heavy load on the system and within another few minutes the BMS would have turned off the battery and obviously the inverter.

You'd also need to factor that there needs to be another power source available to power on the inverter so you can wake up the battery and charge it, or you have a separate smart 24v charger available (easiest method).

I've actually used something as small as a transistor radio battery to power up a controller that died when their was no NEPA available and the BMS had shut the battery off for a 12v system earlier. So don't be scared, just be prepared.

This is close to what I tried earlier but I will take a run at it again. Thanks much!

badaru1:
Good morning all, I'm experiencing an issue with my Welion inverter. It had a short circuit this morning, causing both input and output currents to shut down. Currently, I'm getting an error code 08. How can I sort it out?

Bus voltage too high?

I don't think there's anything you can do to it.

Try to reset the inverter