Dal2000

Hi all, I’ve got a Mecer 200Ah LiFePO4 (12.8V) battery, about 2 years old, running with a RCT VM1 1000w 12v inverter. Because load shedding has been minimal, the battery hasn’t worked hard – maybe 200 cycles total, mostly shallow. I recently tested it with a constant 500W load through the inverter. It only lasted about 2 hours before low-voltage cutoff. That feels way too short – I was expecting closer to 4–4.5 hours for a healthy 200Ah battery, even with inverter losses. The battery label says: Bulk/absorption: 14.6V “Recommended for inverter”: 14.1V (which I’ve been using daily) Cut off 10.5v, I've set the inverter to 11.5 From what I’ve read, LiFePO4 batteries balance best at higher voltages (around 14.4–14.6V). So maybe charging at 14.1V all the time has prevented proper balancing, especially since the battery rarely gets a full charge? Questions: Is this safe, and will occasional full charges at 14.6V help re-balance? Has anyone else with a Mecer 200Ah seen low capacity like this, and fixed it with higher voltage charging? Could there be other causes (BMS issues, early cell degradation, inverter cutoff too high)? After testing, should I go back to 14.1–14.2V daily and just do a 14.6V top-up monthly? Any advice or experiences with these batteries + Axpert/Mecer inverters would be much appreciated. Thanks, Dale

It was 3.5k. No idea what caused it, at the time there was no load shedding. Just noticed the problem when the battery ran empty.

Hi all, I have a 5 star 1000w 12v inverter. Put simply, the inverter is not recognizing AC input. It uses the battery but doesn't charge or recognize AC input. The cables have been checked. No error codes, nothing. It simply does not receive AC. Could a reset or something else correct the issue or is this inverter now dead? Unfortunately I cant find this model online. Thanks

Sorry to Necro this thread, but is this Inverter decent? I'm looking to replace a really crap MSW inverter. Looking at all the axpert clones, it's hard to choose.

I set the float charge to 13.6 as recommended. When the inverter is actually "floating" the OSD on the inverter shows 13.3. The multimeter on the battery shows lower, 13.2. I see an explanation is provided for the charging issue. Guess it's replace or keep at this point. This is on special at the moment: https://www.firstshop.co.za/products/rct-axpert-vm2-premium-1200w-pure-sine-wave-inverter-with-2000w-mppt-charger-rct-axvm2-prem-1-2k-12v-169974 Any recommendations?

all, wondering if you can provide some insight. I have the above mentioned battery with a horrible Mecer IVMS 1200MPPT Inverter that "supports" lithium batteries. I set the cut off to 10.8v as recommend by the manual on the box, sadly this morning I had to jump the battery to wake it up as the inverter didn't do its job. As much as I hate this inverter, it does the job. However I've been recommended not to set the charging to 25amps as it will "blow/pop" the inverter. I notice the float is set to 13.6 but the OSD on the inverter shows 13.3. Should I set the battery cut off to 11.8 or so? Additionally at 10 amps, it takes more approx 16 hours to charge (according to my calculator). Should I just bite the bullet and get rid of this noisy piece of garbage from Mecer? Any advice regarding voltages would be great.

So essentially it's a simple water pressure pump that sits between the water tanks and the house. If it doesn't work, we get no water. This is all I really wanted to power without getting a generator. It's a 1kva pressure pump, when running uses about 800 watts. Is a generator a better option perhaps?

Thanks mate appreciate it. I now just need to figure out how many panels I would need to run without having to use much if any AC during the day

It's just the water pressure pump. Lights could work too but the more I add the more battery is going ah is required. My budget is 20k which is already probably too low. I need the pressure pump to run 2 hours minimum. 200ah lithium might only just cut it? Though I was hoping daytime the panels would do some heavy lifting.

Hi guys. I need a backup solution to run a thirsty 800-1000w water pressure pump. I want to try get this thing onto solar too. I'm looking at a 1500w inverter, 12v if possible. Running watts for this pump sits at around 800, startup assuming 1kva. Is 12v going to be pushing the limits? Should I rather get 24? Additionally, I'd love to know how many solar panels I'd need (not installed solar before). Thanks

I just wanted to add something odd with this IVR 1200 MPPT Mecer. It gets to 14.05 volts, then sits at that voltage for more than an hour (Target is 14.1), then finally drops to float at 13.4. Is this to compensate for lead acid?

Are you referring to the fan?

Damn. Ok I was under the impression that only modified sine wave emit the buzzing sound when working? Aka on battery.

How are these "Fivestar" inverters?

Sorry, yes I'm using a 200@h mecer lithium