Posted February 14, 20205 yr I was wondering if anyone is using this inverter with Lithium Iron Phosphate batteries. According to the manual only lead-acid should be used, yet I have heard some people are using them with custom charging modes. Even then, is the built-in charge controller not going to charge as per lead-acid charging methods?
February 14, 20205 yr 4 hours ago, netstrider said: I was wondering if anyone is using this inverter with Lithium Iron Phosphate batteries. Plenty (not including me). Quote According to the manual only lead-acid should be used ? Where does it say that? Quote Even then, is the built-in charge controller not going to charge as per lead-acid charging methods? Yes, but fortunately LFP batteries are very easy to charge, and charging as if it was lead acid works pretty well. There is the issue of the very flat voltage versus state of charge curve, but it can largely be worked around. And of course, the dreaded premature float bugs, and lately dips and freezes (PV not charging the battery for some time, or until the end of the day).
February 14, 20205 yr I could not find the difference between the KING 5000M and the KING 5000K. I am using the AXPERT KING 5K with 2 x Pylontech US3000. This works great after I upgraded the firmware to 71.86 and the PYL option was available. The BMS controls all battery related parameters in the inverter. There is only a minor issue with the setting of the charge current because this setting limits the solar current to the same value. But this will not come into play since you only want backup power.
February 14, 20205 yr Author 4 hours ago, Coulomb said: Plenty (not including me). ? Where does it say that? Yes, but fortunately LFP batteries are very easy to charge, and charging as if it was lead acid works pretty well. There is the issue of the very flat voltage versus state of charge curve, but it can largely be worked around. And of course, the dreaded premature float bugs, and lately dips and freezes (PV not charging the battery for some time, or until the end of the day). Both here - http://inverexcustomercare.com/wp-content/uploads/2018/06/APT-Axpert-KING-3KW5KW-manual-20180112B.pdf And here (Kodak which I presume is also Axpert) https://solaradvice.co.za/wp-content/uploads/2019/07/Axpert-KING-manual-NEW.pdf
February 14, 20205 yr Author 2 hours ago, MJS said: I could not find the difference between the KING 5000M and the KING 5000K. I am using the AXPERT KING 5K with 2 x Pylontech US3000. This works great after I upgraded the firmware to 71.86 and the PYL option was available. The BMS controls all battery related parameters in the inverter. There is only a minor issue with the setting of the charge current because this setting limits the solar current to the same value. But this will not come into play since you only want backup power. Not sure of the K, but I know the M is, presumably, for modular in that it can run parallel. From the datasheet I have only the 3kVa is not M, but P. Well yes, and no. I do intend getting PV later on. Does this unit check PV first before relying on mains AC? For example, if I have 1kW coming from PV but need 2kW will it share the load or switch completely to mains? Edited February 14, 20205 yr by netstrider
February 15, 20205 yr On 2020/02/14 at 7:54 PM, netstrider said: Both here - http://inverexcustomercare.com/wp-content/uploads/2018/06/APT-Axpert-KING-3KW5KW-manual-20180112B.pdf And here (Kodak which I presume is also Axpert) https://solaradvice.co.za/wp-content/uploads/2019/07/Axpert-KING-manual-NEW.pdf Well spotted re the lead acid batteries in the use manual. Could it be an entry inherited from an older version of this or another manual, that was never updated? As of yesterday I am using an Axpert King 5K inverter with 2x Pylontech US2000 li-ion batteries. This seems to be a common pairing and given the attachment I've included here, one that Pylontech supports. I made a communication cable to run between my inverter and batteries using the instructions in the attachment. The only thing it omits, without which the cable doesn't help, is that one has to lift the first dip switch on the battery to set the baud rate to 9600. I found that piece of information on this forum somewhere, which is how I signed up Pylontec Axpert VMIII-KING Configuration (used for cable, set battery dip switches to 1000).pdf
February 16, 20205 yr On 2020/02/15 at 3:54 AM, netstrider said: This is a very old piece of text. So it could well be that they didn't bother to update it for the post lead acid era. I think they're trying to say "don't be stupid and try to recharge a non-rechargeable battery, it will likely burst". With the sweeping implication that all rechargeable batteries are lead-acid. It could also be interpreted this way: IF you are using a lead acid battery, make sure it's a deep cycle type, not any of the other types of lead acid battery (such as a starter battery or marine type). This seems less likely, since these aren't likely to burst as a result of not being deep cycle types. I would just ignore it.
February 16, 20205 yr @MJS On 2020/02/15 at 4:25 AM, netstrider said: Not sure of the K, but I know the M is, presumably, for modular in that it can run parallel. No, the M is for MPPT, the P is for PWM. I've not come across the PWM model before. The Voltronic Power and MPPSolar web sites don't mention them. Perhaps the 3000P model is specially made for Mecer. Or it's a new model and Mecer are quicker to update their web page than the others. On 2020/02/15 at 4:25 AM, netstrider said: Does this unit check PV first before relying on mains AC? For example, if I have 1kW coming from PV but need 2kW will it share the load or switch completely to mains? The Axpert Kings use a double conversion design. That is, in line mode (different to line mode on so far all other Axperts), AC-in to AC-out goes via an AC-DC converter, then a DC-AC converter. Battery and/or PV power blend at the DC point. So yes, in line mode, if 2 kW is needed and only 1 kW is available from PV, the other 1 kW will come from mains. But if you need 7 kW and 4 kW is available, because the 7 kW exceeds the rating of the inverter, it will take all 7 kW from the mains. It will then be in bypass mode (different to line mode on the Axpert King). But presumably, this will be a rare and short-duration event, assuming that your inverter(s) is (are) sized to handle most loads.
February 16, 20205 yr On 2020/02/15 at 5:37 PM, Ryanwb1 said: Whats the main difference between the Axpert Mecer King and the Mecer MKSII? As per the above post, the Axpert King is double conversion, so it is able to blend AC-in power with PV and battery power. The MKS II is usually able to blend only PV and battery power. If it has to switch the loads over to AC-in, all of the load power will come from AC-in. [ Edit: there are times when it seems to blend AC-in and PV power. ] The Axpert King has a 145 V max MPPT, so you need strings of 2S panels (or 3S of 60 cell panels). The Axpert MKS II has a 450 V max MPPT, so you have to wire at least about 6 panels in series. The King has the removable display; the MKS II does not. Recently manufactured King models have the ability to connect directly to the BMS of a PylonTech battery; the MKS II does not. [ Edit: as of July 2020, there is a new model of Axpert MKS II that does; MPPSolar call it the PIP-5048MGX. ] Edited July 14, 20204 yr by Coulomb
March 23, 20205 yr 20 hours ago, DaveSA said: is this on the King model Yes. 20 hours ago, DaveSA said: Will it actually bypass and allow 7kW load and if so for whatt duration My understanding is that it can bypass ("pass through") 40 A like the other 5 kVA models, so that's some 9 kVA, over 7 kW with a typical power factor. It can do this continuously.
July 13, 20204 yr On 2020/02/16 at 3:03 AM, Coulomb said: As per the above post, the Axpert King is double conversion, so it is able to blend AC-in power with PV and battery power. The MKS II is able to blend only PV and battery power. If it has to switch the loads over to AC-in, all of the load power will come from AC-in. The Axpert King has a 145 V max MPPT, so you need strings of 2S panels (or 3S of 60 cell panels). The Axpert MKS II has a 450 V max MPPT, so you have to wire at least about 6 panels in series. The King has the removable display; the MKS II does not. Recently manufactured King models have the ability to connect directly to the BMS of a PylonTech battery; the MKS II does not. Will it charge the batteries from the PV while it’s in this bypass mode?
July 14, 20204 yr 7 hours ago, naeemZA said: Will it charge the batteries from the PV while it’s in this bypass mode? Yes. I note that there is a new model of Axpert MKS II, which MPPSolar call the PIP-5048MGX, which has the new style removable display and can talk directly to a number of battery BMSs directly (not just Pylontech any more).
December 25, 20204 yr Hi all, I have a question about Axpert King 5k. I understand that it is equivalent to pip 5048mk and that it has double conversion. Well, I have a limited mains supply (max 2kW, meaning that if overloaded it goes down completely). I'd like to know if it is possible to limit power from mains to 2kW (and add the rest from battery) if power higher than 2kW is needed. And, yes, I know this thread is pretty old ... Thank you.
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