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modual that monitors the output of a bms??
#11
thanks for the help why didnt thik of mosfets, ive got a few
Battery is li iron using 18650s, 14s, 0p, and growing cell so far 300, untesteded.
Bms is a diy open source by stuartpittaway.
No solar yet, 
Building wind turbine, 48v im after a 48v motor if anybody has one for sale.
Cells 2000 to 2500ma.
Cells 1500 to 2000ma.
Cells 1000 to 1500ma.
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#12
or just use a relay or contactor and skip all the losses Tongue All depends on what you are going to use it for.
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#13
(10-29-2019, 08:11 PM)daromer Wrote: or just use a relay or contactor and skip all the losses Tongue All depends on what you are going to use it for.

But the coil current = losses (on regular contactors anyway!)
I think those gigavolt ones change state with a pulse then don't need "holding current".

Depending on the current, as inside inverters, enough MOSFETs in parallel can have very low on resistance = low/"no" losses.
Running off solar, DIY & electronics fan :-)
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#14
Contactor or relay is less than most other electrical ways Smile

Its max 1-4w
The Ultimate DIY Solar and build place
YouTube / Forum system setup / My webpage  Diy Tech & Repairs

Current: 10kW Mpp Hybrid | 4kW PIP4048 | 2x PCM60x | 83kWh LiFePo4 | 10kWh 14s 18650 |  66*260W Poly
Upcoming: 14S 18650~30kWh | Automatic trip breakers, and alot more
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#15
What about one of these guys? https://www.thornwave.com/collections/sm...-relay-ssr I know it is 12v but 100amps seems optimistic?
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#16
well i needed tsomething that used low current like a mosphet, not a rtelay as it would use too much current
Battery is li iron using 18650s, 14s, 0p, and growing cell so far 300, untesteded.
Bms is a diy open source by stuartpittaway.
No solar yet, 
Building wind turbine, 48v im after a 48v motor if anybody has one for sale.
Cells 2000 to 2500ma.
Cells 1500 to 2000ma.
Cells 1000 to 1500ma.
Reply
#17
The gate drive to a MOSFET is like a small capacitor, you "charge it up" to say 12V & leave it there, no on-going current is drawn "driving" it.
MOSFET losses would be due to current flow (Amps) x on-resistance.
If you're switching it on & off fast like in an inverter, other losses can apply.
For several good MOSFETs in parallel, the on-resistance gets pretty small & losses minimal even at >50A currents.
Notice how most of the BMS circuits don't bother with big (any!) heat sinks....

If you picked that SSR it does have much higher losses & would get quite hot & need a good heatsink with sustained higher currents.

If you're thinking of building a wind turbine, have a good look at Fisher & Paykel washing machine motors, seems they make good generators.
Running off solar, DIY & electronics fan :-)
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