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Batrium: Using multiple mons to increase total bypass current.
#11
Not that I'm aware of. We tried stacked Eltek Flatpacks perhaps 18 months ago when the WM4 was still having issues, we were able to CAN control it (including charge rate) via the WM, but there were some reliability issues - and being an AC charger, that can be fed with DC to do DC to DC charging it wasnt ideal. The Victron, and Venus system appears to be the only complete system that Batrium can talk to, although there is mention of other manufacturers component compatibility on Batriums page.

There a pile of Schneider XW kit arriving here soon, including a MPPT80-600 MPPTs - for a system to be built around a REC Q BMS but the intention is to see if/how the Schneider integration mentioned on the Batrium page actually functions. Chris Adam's uses Schneider/Batrium I'll find out how well they talk to each other.

If I recall you are completely off grid ? - so perhaps you wont be able to find a use for a Flatpack, if you can, let me know as we have a small mountain of them - for their size they are very powerful and versatile.
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#12
(08-18-2019, 09:40 AM)Sean Wrote: Not that I'm aware of. We tried stacked Eltek Flatpacks perhaps 18 months ago when the WM4 was still having issues, we were able to CAN control it (including charge rate) via the WM, but there were some reliability issues - and being an AC charger, that can be fed with DC to do DC to DC charging it wasnt ideal. The Victron, and Venus system appears to be the only complete system that Batrium can talk to, although there is mention of other manufacturers component compatibility on Batriums page.

There a pile of Schneider XW kit arriving here soon, including a MPPT80-600 MPPTs - for a system to be built around a REC Q BMS but the intention is to see if/how the Schneider integration mentioned on the Batrium page actually functions. Chris Adam's uses Schneider/Batrium I'll find out how well they talk to each other.

If I recall you are completely off grid ? - so perhaps you wont be able to find a use for a Flatpack, if you can, let me know as we have a small mountain of them - for their size they are very powerful and versatile.
We have diesel backup for winter use but that charges through the outback vfx3048e at around 40 amps. I use %SOC from the outback shunt to start/stop the generator. So for AC charging we are well covered but thanks for the offer.
Sean likes this post
Current system: 9.6kWh wet Nicad batteries, 16S1P Calb LiFePo4 210aH, Batrium WM4, Outback vfx3048 inverter, mx60 mppt controller, flexware 500 mounting hardware, 2.4kW solar array, 6kW lister diesel genset. MY'13 Vauxhall Ampera
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#13
(09-29-2019, 06:47 PM)EVINITY Wrote:
(08-16-2019, 07:54 PM)Sean Wrote: Cell voltage needs to be rising in order for multiple mons to all switch on - with large capacity cells a few fractions of a volt is significant.

A rise in voltage above a target indicates an excessive charge current - bypassing that excessive current through a resistive component isn't a productive use of available energy. Bypassing numerous amps via thermal energy is just daft ..... but each to their own etc.

Charging at high rates using a charger that isnt under BMS control is dangerous, limiting the charge rate when in bypass is a fairly well established norm, which is why any competent BMS will be able to signal to a compatable charger a limited charge rate - it's a safety feature, which is why I'm still pondering why anyone would consider multiple mons to increase the bypass current.

I raised the question about bypassing significant amps, by using multiple mons simply as I was curious to see who, and if anyone was using such a configuration in a genuinely productive and effective manner.
Saw a youtube by @HBPowerwall using multiple longmons on a pack - which opened my eyes to this concept.

The concept of using multiple mons is flawed.
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