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[AbnormalWrench]

I feel like this shouldn't be heard to find, but my googling hasn't been very helpful. I have a 2022 FX7.2 Zero, I'm looking for an aftermarket charger that is capable of 6KW/hr, or there abouts. Does anyone know of a company offering that? Thanks!

[DonTom]

I feel like this shouldn't be heard to find, but my googling hasn't been very helpful. I have a 2022 FX7.2 Zero, I'm looking for an aftermarket charger that is capable of 6KW/hr, or there abouts. Does anyone know of a company offering that? Thanks!

You didn't say where you're located.


But I got my two 3.3 KW chargers here and they know how to program them up for Zeros.


-Don-  Reno, NV

[MVetter]

Just remember that 6.6kW is above 1C and the BMS will disengage the pack. You'd need to detune them from 32 amp output to max of 28.5 amps.

[DonTom]

Just remember that 6.6kW is above 1C and the BMS will disengage the pack. You'd need to detune them from 32 amp output to max of 28.5 amps.

Yeah, I use two Elcon  2.5 KW chargers for my 2017  Zero DS  with the 7.2 KWH battery. Problem is they do not make those 2.5KW chargers anymore. But I use them with the OBC and now I am at around 6.3 KW.  That works well.


I charge my 2017  Zero SR (with power tank) at close to 8KW.  Two 3.3 KW chargers plus the OBC. Batts total 16.3 KWH (max) in that case.


Perhaps the way to go with the FX would be one of those 3.3 KW charger plus the OBC for a total of almost 5 KW of charging.


-Don-  Auburn, CA

[MVetter]

Batts total 16.3 KWH (max) in that case.

Sorry nothing available close to that with actual amounts. The 14.4 pack has 114 Amp hours as recognized by the bike and a nominal voltage of 102 vdc. A similarly sized power tank is 28.5Ah for a total of 142.5Ah @102vdc = 14,484Wh = 14.5kWh

[DonTom]

Sorry nothing available close to that with actual amounts. The 14.4 pack has 114 Amp hours as recognized by the bike and a nominal voltage of 102 vdc. A similarly sized power tank is 28.5Ah for a total of 142.5Ah @102vdc = 14,484Wh = 14.5kWh

I was using Zero's max numbers as on the 2017  battery. 13.0 KWH plus 3.3 KWH (Pwr Tank)=16.3KWH. I realize that's above the nominal and useable range. But charging it all at 8 KW is well below what these batteries can handle.


-Don-  Auburn, CA

[MVetter]

To clarify: you're using Zero's MARKETING numbers. The numbers as recognized by the actual bike are vastly different. The 2017 packs are 26Ah per brick totaling 104Ah at the monolith. 104 + 26 = 130Ah x 102vdc 13,260Wh aka 13.2kWh.  And, yes, 8kW is well within the boundaries but don't believe for a minute that you had 16kWh available.

[TheRan]

So I have a question, what is the term for the numbers that Zero gives? I understand that nominal capacity uses a nominal voltage because the voltage varies from max to min, so the nominal capacity is how much energy the battery can actually deliver over a full discharge cycle. But a "max capacity" doesn't actually mean anything, right? It's not actually attainable, not an accurate measurement in any way. Also Energica gives a max capacity as well as the nominal. Even though the max isn't an actual thing would they still be comparable between batteries of different voltages, like is the increase over the nominal measurement the same or does it scale differently based on the voltage?

[DonTom]

To clarify: you're using Zero's MARKETING numbers. The numbers as recognized by the actual bike are vastly different. The 2017 packs are 26Ah per brick totaling 104Ah at the monolith. 104 + 26 = 130Ah x 102vdc 13,260Wh aka 13.2kWh.  And, yes, 8kW is well within the boundaries but don't believe for a minute that you had 16kWh available.

I never did. I just do not remember the real numbers, the BS numbers are right on the battery, makes then easier to remember.


-Don-  Auburn, CA

[DonTom]

So I have a question, what is the term for the numbers that Zero gives?

Max capacity. Not really the max you can use.


But I assume if the nominal capacity is well below the max capacity, the life of the battery will probably last a bit longer. So perhaps it is good to look at both numbers. But don't expect a 7.2 KWH Zero battery to be able to store 7.2 KWH. Well, perhaps it could if you wish to destroy the battery ASAP.


-Don-  Auburn, CA

[TheRan]

Yeah that's what they call it, but it's not actually a measurement of the maximum capacity. It's like saying a 2 litre bottle can hold 3 litres of water, it makes no sense. I was just wondering if there's a proper term for the number calculated by multiplying the max voltage by the Ah, and if it's comparable across batteries with different voltages.

[Richard230]

The first app introduced for my 2014 Zero S had an option showing the (claimed) actual kWh remaining in the battery pack. I really liked that information. Within one year of introducing the online smart phone app system one of the early updates to the app eliminated this item.    I believe it was replaced with the SOC percentage in the app.

[DonTom]

Yeah that's what they call it, but it's not actually a measurement of the maximum capacity. It's like saying a 2 litre bottle can hold 3 litres of water, it makes no sense. I was just wondering if there's a proper term for the number calculated by multiplying the max voltage by the Ah, and if it's comparable across batteries with different voltages.

I would say it's more the other way. A 3-liter bottle that can only hold two liters max.


Seems the Zero DSR/X will let us charge a little more above the nominal capacity by pressing a button. It even then says 110% SOC on the screen. Not to be used too often. So max capacity is really a max capacity but it's hard on the battery.  But the max capacity should really be there, just normally we cannot use it. Way too hard on the battery.




-Don-  Auburn, CA

[Specter]

Ideally, the more 'in the middle' a battery is cycled, the longer it will last.  Taking it to either the full or empty end will drastically shorten it's life, by as much as 50 percent or more in circumstances.  So by giving you say a 18 kw battery, at it's Max, but letting you only cycle it 15 kw, gives basically around a 10 percent of a buffer at either end if set up properly.  This could get a few more thousand cycles out of it over a complete cycle from top to bottom.

Running it fully up and down on occasion won't hurt it, and of course lets you see a general condition / capacity left on the thing, however over charging / discharging it will greatly kill it's life expectancy, even though the last few volts can kind of fly by fast, the damage is being done.  Most battery BMS will cut a battery out when you get into danger territory but still, by the time they kick, damage is being done, much like by the time a fuse blows, something probably already BTFU before the protection kicked in.

Aaron

[AbnormalWrench]

Appreciate all the replies! I honestly forgot I posted this and never got an email letting me know I had replies, and I don't see a way of turning that on in the settings...?
Good to know I can't quite pull off 6KW/hour of charging, but with a controller I can easily throttle it. I had read elsewhere that the BMS would allow up to 7KW/hour, but that post was from a long time ago. That is the frustrating thing about trying to research this, even though the bike model has been made for decades, there is very little info about changes over that time.