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by weber
Tue, 03 Oct 2023, 07:07
Forum: Members Machines
Topic: Voltron-Evo; jonescg's new electric race bike
Replies: 357
Views: 136755

Re: Voltron-Evo; jonescg's new electric race bike

O wot you expect it to be practical as well as beautiful? :lol: Of course I had no idea about that constraint on the balance wires. What about temperature sensors? Don't you need to get them into the middle? The balance wires could be fed out between the outer plates. I assume you're already using w...
by weber
Mon, 02 Oct 2023, 12:13
Forum: Members Machines
Topic: Voltron-Evo; jonescg's new electric race bike
Replies: 357
Views: 136755

Re: Voltron-Evo; jonescg's new electric race bike

Chris, your cell grouping and interconnections were certainly challenging. I saw how many different shapes you ended up with, and how bizarre a few of those shapes were. I counted 5 cell-group shapes and 14 connecting-plate shapes, with between 1 and 5 copies of each plate shape. So I took it as a c...
by weber
Fri, 15 Sep 2023, 09:20
Forum: Renewable Energy and Storage (Non-EV)
Topic: PIP inverter repairs and hardware modifications
Replies: 1538
Views: 330686

Re: PIP inverter repairs and hardware modifications

I had already replaced the IGBTs (Q27-30 and the 'buck' Q31) - and I'm thinking that if one of those were not switching properly, I wouldn't get full inverter power out or charging power in (not for an hour). The MOSFETS I hadn't checked before - so to check that all 16 of the MOSFETS are switching...
by weber
Thu, 14 Sep 2023, 21:35
Forum: Renewable Energy and Storage (Non-EV)
Topic: PIP inverter repairs and hardware modifications
Replies: 1538
Views: 330686

Re: PIP inverter repairs and hardware modifications

I mentioned this capacitor episode to our friend Warrick Beattie. He wondered if the capacitors had been on the shelf so long that they needed reforming before use.
https://youtu.be/XsWDmme-tl8?t=742
by weber
Thu, 14 Sep 2023, 08:54
Forum: Renewable Energy and Storage (Non-EV)
Topic: PIP inverter repairs and hardware modifications
Replies: 1538
Views: 330686

Re: PIP inverter repairs and hardware modifications

I concur with Coulomb. Except I'd be wary of buying the same part number again, even from a different supplier. You totally found the capacitors with the best specs for the job, at least on Digikey (which has the best parametric search). But those caps are not living up to their specs, unless there ...
by weber
Mon, 11 Sep 2023, 08:33
Forum: Renewable Energy and Storage (Non-EV)
Topic: PIP-4048MS and PIP-5048MS inverters
Replies: 3260
Views: 1270240

Re: PIP-4048MS and PIP-5048MS inverters

So core question is: Can I get the chargers to work in 1Phase while the inverters are in 3Phase ? No. Do I need switched 3-phase from the house so that utility charging will start ? No. Or is there a setting/trick that I can use one charging unit by itself ? Yes. Configure them as 3 single-phase in...
by weber
Fri, 08 Sep 2023, 20:14
Forum: Members Machines
Topic: Voltron-Evo; jonescg's new electric race bike
Replies: 357
Views: 136755

Re: Voltron-Evo; jonescg's new electric race bike

Derp. I just realised that the Rinehart PM150 inverter is able to read DC amps and DC volts, and spit this data out as CAN packages. The trick then will be to display them on the dash, and to have some smarts to integrate them. Question is, using what? Can the inverter read an external shunt? If no...
by weber
Wed, 06 Sep 2023, 19:33
Forum: Renewable Energy and Storage (Non-EV)
Topic: PIP-4048MS and PIP-5048MS inverters
Replies: 3260
Views: 1270240

Re: PIP-4048MS and PIP-5048MS inverters

The closest I can find to 5048MS is the Growatt 5000TL HVM off-Grid Solar Inverter 58.4v Might be ok, Well found! But that's a clone rather than a rebranded Voltronic. However it does look like a clone of the Axpert MKS 5K, so there is a small chance that it might work in parallel with a PIP-5048MS...
by weber
Wed, 06 Sep 2023, 18:53
Forum: Renewable Energy and Storage (Non-EV)
Topic: PIP-4048MS and PIP-5048MS inverters
Replies: 3260
Views: 1270240

Re: PIP-4048MS and PIP-5048MS inverters

Do you know if the 64V model is also still available, I haven’t been able to find that listed on the MPP site. I would buy another couple of those and run one system on 58.4V and the other grid independent system on 64V units, that way I would have 2 spares for each system. Despite what Coulomb say...
by weber
Wed, 06 Sep 2023, 17:45
Forum: Members Machines
Topic: Voltron-Evo; jonescg's new electric race bike
Replies: 357
Views: 136755

Re: Voltron-Evo; jonescg's new electric race bike

Integrating a coulomb counter into a BMS master unit is an obvious thing to do. That's what Coulomb and I did since Mexy, in the BMU of our Monolith home battery systems. We basically took our IMU and added a couple of isolated RS232 ports, and MOSFETs to control 5 contactors, and made it talk to th...
by weber
Wed, 06 Sep 2023, 14:25
Forum: Members Machines
Topic: Voltron-Evo; jonescg's new electric race bike
Replies: 357
Views: 136755

Re: Voltron-Evo; jonescg's new electric race bike

Brendon's suggestion to use two isolated shunt/voltage-sensors is a good one. That's what we do in Mexy. Not only for the lower voltage but because we have a separate charger for each half-pack, and so they can be at different states of charge. And I just remembered that you have separate chargers t...
by weber
Wed, 06 Sep 2023, 12:55
Forum: Members Machines
Topic: Voltron-Evo; jonescg's new electric race bike
Replies: 357
Views: 136755

Re: Voltron-Evo; jonescg's new electric race bike

Voltron-Evo and Mexy are pretty unusual in having 750 V batteries. You could use a LyteFyba IMU on top of the shunt and then program an Arduino or RPi, in a box with an LCD and some buttons, as the display unit. I don't have any LyteFyba IMU PCBs left, but you could get one made.
by weber
Wed, 06 Sep 2023, 08:36
Forum: Members Machines
Topic: Voltron-Evo; jonescg's new electric race bike
Replies: 357
Views: 136755

Re: Voltron-Evo; jonescg's new electric race bike

If you're thinking of hall-effect current measurement devices (typically LEM brand), similar to a clamp-meter, they are useless for coulomb counting as they have terrible offset errors and terrible drift in that offset. You need an accurate zero for coulomb counting, otherwise it will soon integrate...
by weber
Wed, 06 Sep 2023, 07:31
Forum: Members Machines
Topic: Voltron-Evo; jonescg's new electric race bike
Replies: 357
Views: 136755

Re: Voltron-Evo; jonescg's new electric race bike

Something I'd like to know is if I can get a half-way decent coulomb counter for the race bike. I see Altronics sells one of these: https://www.altronics.com.au/p/q0596-flush-mount-350a-coulometer-with-shunt/ But it's powered from the voltage source, which maxes out at 120 V DC. I thought about sup...
by weber
Wed, 06 Sep 2023, 05:35
Forum: Renewable Energy and Storage (Non-EV)
Topic: PIP-5048MK inverter
Replies: 615
Views: 222769

Re: PIP-5048MK inverter

CorLotte wrote: Tue, 05 Sep 2023, 22:20 Great job done! Let me ask you. What is the maximum current possible in dynamic charge?
Thanks. The maximum is 140 A, same as with the EEPROM setting.
by weber
Tue, 05 Sep 2023, 19:51
Forum: Members Machines
Topic: Voltron-Evo; jonescg's new electric race bike
Replies: 357
Views: 136755

Re: Voltron-Evo; jonescg's new electric race bike

Great to see this thread resurrected. :) Good onya, Chris.
by weber
Fri, 25 Aug 2023, 19:32
Forum: Admin Notices and Requests
Topic: Uploading images
Replies: 8
Views: 5293

Re: Uploading images

That should be fixed now. Please try again.
by weber
Mon, 31 Jul 2023, 18:19
Forum: Batteries, charging, management and monitoring
Topic: Low cost BMS
Replies: 450
Views: 150887

Re: Low cost BMS

Sorry. I was thinking of N-channel for both the JFET and the MOSFET. But you clearly said you used a P-channel MOSFET. Which will indeed turn on when its gate is negative with respect to its source. You wrote "I thought that if the gate was the same voltage as the drain the device should be sol...
by weber
Mon, 31 Jul 2023, 17:59
Forum: Batteries, charging, management and monitoring
Topic: Low cost BMS
Replies: 450
Views: 150887

Re: Low cost BMS

The drain-source conduction is controlled by the gate-source voltage, not the gate-drain voltage. With the JFET, gate negative with respect to source turns it off. With the MOSFET, gate positive with respect to source turns it on. But with both the JFET and the MOSFET the signal gets inverted, so yo...
by weber
Mon, 31 Jul 2023, 17:34
Forum: Batteries, charging, management and monitoring
Topic: Low cost BMS
Replies: 450
Views: 150887

Re: Low cost BMS

level shifter.png
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by weber
Mon, 31 Jul 2023, 15:59
Forum: Batteries, charging, management and monitoring
Topic: Low cost BMS
Replies: 450
Views: 150887

Re: Low cost BMS

Don't do it. Keep the optocouplers. See viewtopic.php?p=48333#p48333
by weber
Fri, 16 Jun 2023, 14:09
Forum: Renewable Energy and Storage (Non-EV)
Topic: LFP Battery 48v.
Replies: 66
Views: 1478

Re: LFP Battery 48v.

How are you planning to do the connections to the fuses and then to the inverter?

I think it would be simpler to go back to this arrangement:

by weber
Mon, 12 Jun 2023, 20:15
Forum: Renewable Energy and Storage (Non-EV)
Topic: LFP Battery 48v.
Replies: 66
Views: 1478

Re: LFP Battery 48v.

Yeah. I guess that's better.

You could also swap every BMS connection to the other side.
by weber
Mon, 12 Jun 2023, 19:46
Forum: Renewable Energy and Storage (Non-EV)
Topic: LFP Battery 48v.
Replies: 66
Views: 1478

Re: LFP Battery 48v.

3P.png
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by weber
Mon, 12 Jun 2023, 17:55
Forum: Renewable Energy and Storage (Non-EV)
Topic: LFP Battery 48v.
Replies: 66
Views: 1478

Re: LFP Battery 48v.

This means that in horizontal connections, current-carrying buses of a much smaller cross-section can be used, do I understand correctly? I would agree with you, except for the BMS. To ensure that it is measuring a voltage that is representative of all the cells in the parallel group, the horizonta...