Omarsz

Can a 5k MKS II handle a kettle with 1500-2000 watt power consumption? It is connected with ~3.5kw Solar Pannels (10 * 405w Canadian Solar) + 4 Ritar Opzv Ritar 200Ah Batteries I'm mostly worried that these kettle don't have a slow increase in power consumption (or that's what I think).

Hello Coulomb I felt the MKS II is a better replacement for my needs as this can be connected to other (up to 9) inverters. It also could charge the batteries at high Amps from PV (Charging batteries at 23A from PV alone. I couldn't cross the 11A with the VM II inverter) I've posted about the U1 in another topic where we exchanged some posts (U1= 71.20) https://powerforum.co.za/topic/2325-axpert-5kva-firmware/?tab=comments#comment-39029 I do have a cooperative supplier but I have no idea if he has access to a firmware update. I can definitely ask. Could you please let me know where I can read more about the premature floating bug or how could I notice such a bug? (what problems should I face if I'm not already facing/faced this issue?)

Hello TTT I've just charged the batteries with Utility. After around 2 and a half hours, one of the 4 batteries is warm. Significantly warmer than the other 3. I've also checked their voltages and found that the warm battery has 13.2 V while the other 3 are 12.5 V. Is this battery faulty for sure? My main problem with the system right now is that the storage system doesn't feel like 4 batteries. It discharges faster than another system with 2 * 200ah/12 v with Axpert KS 3kva system.

I've switched my Axpert VM2 5kva Inverter to Axpert MKS II 5kva. Batteries are the same. I've added these values to the new inverter with a technician supervision: Bulk charging voltage leave at 58.4V. Float charging 54.4 V Battery Cut off voltage 46V (Was recommended by the tectechnician. According to him, It's 50% DOD.) Back to grid voltage 48V As I'm a newbie with these things and I'm the one who suggested these values, may I ask if setting the Bulk charging voltage to 58.4V would be dangerous in any sort? I'm trying to be cautious and avoid anything that would void the battery warranty. (Currently, Charging and discharging aren't fast as they were with VM II model. Yet, as soon as PVs no longer provide enough light, battery voltage goes down to ~ 49v. I'm not sure if the batteries were fully charged or not as I've tested it for 2 days only while the sky was cloudy.)

The Inverter sticker details @Coulomb

Here is the firmware version (I guess!)

I've just bought one but won't be installed for at least 3 more hours. I'll update you as soon as it's installed. Thanks for the prompt reply Coulomb :)

I had something pretty similar to what you have but for a new set of batteries. May I know which type of axpert do you have? (V, VM or MKS ...)

May I ask which firmware is recommended for MKS II 5k 5000VA/ 5000W? @Coulomb

Will keep all these options in mind and I'll consult another engineer. Another note: My average consumption on battery is around 80watts at any time. I hardly cross the 130watts and if I do, it won't last for more than few mins (less than 10 mins).

I'll re-read all other posts again and I will see what I should be doing afterward. I've purchased the whole system on the 1st of August, 2018. Almost a month old. I've noticed that the Battery voltage goes down pretty fast. Yet, I don't remember I've reached the 42v level at any day yet (maybe once after the first programming of the inverter but maybe because it didn't have enough time to charge the batteries.) What I've noticed is as soon as PV doesn't provide enough electricity, (~7:00 pm; it's 7:13 pm now.) the battery voltage goes down pretty fast (from 56.6 to 49 to 46 in no time.). It's 46.4 now and 0 watts from PV (7:14pm). Note: I don't use Utility to charge the batteries at all.

Update: I went with 58.4V. But an hour later, I got this error. (beeping error) 04 (battery voltage is too low according to the inverter manual) https://imgur.com/a/8CRJr7O Watchpower screenshot: https://i.imgur.com/xrgOxKP.png Weird thing is, I have almost no load (5-10w. An internet router is connected only.) and the batteries are still charging (6:50 pm. Very low charging) and I haven't been using the battery at all yet.

Thank you guys. I've followed everything but I don't know which one should I go with for the bulk charging voltage. Should I set it to 58.4V?

Thank you Chris and I hope you'll recover soon.

Hello everyone Would you let me know if I've missed any details (or maybe I've given too much details and I've been too broad) to get any comment on this? Any help or guidance would be highly appreciated. Thanks