AEVA Forums

Yes, the iron and nickel hydroxides will turn to carbonates after they have been exposed to air for long enough, same as the potassium hydroxide.
2OH⁻ + CO₂ → CO₃⁻ + H₂O

That mud is most likely a mixture of iron hydroxide and nickel hydroxide. Potassium carbonate is highly soluble in water. It won't be precipitating out.

Do you know if there is a command which will reply with the generated energy (as available on the display)? No, there are no such commands in the versions of the MK/King firmware that we have seen so far. Suorama's post with an infini protocol manual suggests that the commands, if they are ever imp...

eng.bajes wrote: ↑

Wed, 15 Jan 2020, 03:03

i have a problem with my axpert vm2 5kva device , it shows error code 51 and then turning off .
what the electronic component can cause this failure ?

I suggest using the forum search to search on "error 51" without the quotes. There many posts about this in other topics.

LiFePO4, was, possibly, a better option. :roll: I though they may not last as long as NiFe. Who knew? Even good quality LiFePO₄ will definitely not last as long as good quality NiFe. I have a fair amount of manuals for NiFes. :lol: Of course. That was for others who might be reading along. To show ...

Hi dRdoS7 , Yes, NiFe is an unusual case, due to the huge hysteresis between charge and discharge. I see recommended absorb and float voltages of 1.65 V and 1.45 V per cell, so yes, I think 38 cells would be a better choice than 40 cells. You should still be able to get most of the charge out of the...

I have tempered my earlier conclusion that the 64 V variants of these inverters are an abomination. See this post in a different thread.

I'd like to retract, or at least modify, what I wrote here . When I wrote that the 64 V variants are an abomination, I was thinking as an electronics designer. I would never design something like that — a 48 V sine-wave inverter that clips below 48 V. But hey, we're not buying these inverters becaus...

I suggest replacing the DC-side bypass capacitors with longer life units. Thank you coulomb. How can we identify a longer life capacitor? What are specification? Please explan with detail. I agree with what Coulomb says, but would like to add a few things. I prefer to call them the "battery-side DC...

Coulomb and I have had good success with Electrolube HPA conformal coating on our cell-top management units. It doesn't add much to the cost.
https://au.element14.com/electrolube/hp ... %20coating

Chris, I believe Dylan is referring to the AEVA web site, not the forum. Only Rob can deal with that.

Hi gyrovague . I know of no other threads on this topic, in any other forums, apart from the few already linked above: Whirlpool, South African Power Forum and DIY Electric Car. I know of no further evidence. But I also don't think any is required. The voltage versus charge curve, and the overheatin...

hyphenated Welcome to the forum. Can you explain why you say, "I find the use of Lithium chemistry for a daily charge and deep discharge absolutely idiotic, and am prepared to pay a premium to get something with at least ten years of functionality." There are 5 or so different lithium chemistries r...

Wow. Thanks for that, Patrick. They could hardly have got it any wronger. If you're an RACV member, it would be good to email them about it. I'm sure they don't want to be wrong any longer than they have to. At least they got megajoules right.

When i push the flash button in the Axpert Reflash, the WR display show UPG YES. 10 seconds after error code in the Software, the display looks like before. It looks like it wants you to push a button on the inverter's display unit, possibly the one beside the word "YES", to confirm that you want t...

Since there is a hint at the download: Do not use with clones, only with genuine Voltronic Power manufactured machines. Otherwise, fault F90 is likely after a couple of months of runtime. Will I get this issue when flashing a 5048MK with this firmware? The machines sold by MPP Solar, including the ...

Hi @XtractorFan. Sorry to hear what a hard time you had, but thanks for sharing it in such detail, so others are forewarned.

I have read that the theoretically 18A limitation on the solar array input is just the maximum that the inverter is going to take, BUT isn't the MPPT algorithm going to short circuit the panels once in a while for testing the maximum power possible? Maybe the 18A limitation is due to that short cir...

A brilliant response, Coulomb!

I agree with Coulomb. 145 V is an absolute maximum limit for array open-circuit voltage. You need to know the coldest dawn panel temperature you can expect at midwinter in your location and use it to adjust the panel's datasheet Voc (which is at 25 °C) using the datasheet temperature coefficient of ...

@Lee I suggest anyone hoping for solutions to the various problems with Axpert Kings should also keep and eye on the South African Power Forum, in topics such as this.
Axpert King - can't stop it charging from utility

Welcome Lee . I'm sorry it has taken me so long to reply. Unfortunately, Coulomb and I cannot make any changes to the firmware beyond those offered above, as we do not have an MK/King for testing. This also makes it difficult to answer any questions about the inverter's behaviour and how this might ...

I'd state the conclusion a bit differently from Coulomb. I'd say the 64 V models are an abomination. They claim to work with nominally 48 V lead-acid batteries, and they claim to be pure sine wave. And yet they can't even produce a pure sine wave at 48 V, if they have any kind of load on them. [Edit...

I have a new question however. The new guy is on firmware U1 74.31 Do I still flash PB1_72.70b to both the 5KW and 4KW in order to parallel them? The new inverter also shows U2 04.12. Can I leave that as is? My PV array only connect to this inverter. For some reason I get no PV readings on the othe...

Hi Mantas . If you want to have any chance of paralleling the new machine with the old ones, you must not buy a 64 V machine. That means you must not buy a PIP-5048MS. You need an Axpert MKS 5K that does not have the 64 V option, or a rebadged equivalent such as the Mecer SOL-I-AX-5P (not the SOL-I-...