Recent posts

#1

The "Classic" charge controller / Re: Replacing FETs on Classic ...

Last post by Hockey - Today at 02:38:13 AM

4 FETs replaced:  Q9, Q7, Q11, Q13.

After replacing these 4, PV+/PV- impedance = 1MegaOhm.   A good sign!

Connected a 12v Battery, set my bench supply to 32V, 4A and connected it to  PV terminals.  Success!   Photo attached.

Will give it a better workout tomorrow.

I'm going to bed.  It's 2:30am. 

#2

New Product Ideas and Discussion / Re: remote battery sensing

Last post by ClassicCrazy - May 29, 2024, 05:14:04 PM

Correct me if I am wrong.

I am seeing a max charge rate (all 4 batteries) of about 35 amps.

If the differential really is .3v, then .3v X 55v = 16 watts dissipated over connections and cables.

Not huge unless its mostly in one connection.

Barry - you have it about right .
I just played around with the offset until it is close to agreeing with what the batteries bms reports.
Notice also in the graph how the current takes a big dip as the batteries get full. The absorb time is set to about 25 minutes , then to float.
Larry

#3

New Product Ideas and Discussion / Re: A CLASSIC PRODUCT ADDITION...

Last post by Barry Fields - May 29, 2024, 02:07:52 PM

Let us remember my goal here:

For the Classic line

   Eliminate the need to redesign the Classic line. It's not broke!
   Improve the current resolution (SOC calc & Float current)
   Add remote battery sense w/improved resolution (lifepo4 charging & setpoint/range discrimination)

for all MidNite charge controllers

   Add improved Charge Regimen (Float current confirmed Absorb time)
   Add parallel battery bank monitoring (battery bank health, Float current tracking, Current contribution/bank)
   Add sequential load management based on PWM
   Additional sense inputs (? batt box temp, ambient temp, h2o sense...?)

#4

The Rosie / Re: Rosie tell me about SMA

Last post by holdmode - May 29, 2024, 01:49:27 PM

Yeah I know, missing parts but coming soon...! Rosie 7140, caps, bts, manual
F: 24.02.13.01
B: 24.02.07.00
 

#5

New Product Ideas and Discussion / Re: remote battery sensing

Last post by Barry Fields - May 29, 2024, 01:24:11 PM

The new stuff does compare and decides not to use one or the other if it is too far away in voltage difference. 

Would be nice to give the Classic a remote BATTv. (please see BBMT  )

#6

New Product Ideas and Discussion / Re: remote battery sensing

Last post by Barry Fields - May 29, 2024, 01:22:09 PM

Correct me if I am wrong.

I am seeing a max charge rate (all 4 batteries) of about 35 amps.

If the differential really is .3v, then .3v X 55v = 16 watts dissipated over connections and cables.

Not huge unless its mostly in one connection.

#7

New Product Ideas and Discussion / Re: remote battery sensing

Last post by boB - May 29, 2024, 01:19:00 PM

The new stuff does compare and decides not to use one or the other if it is too far away in voltage difference.   

#8

The "Classic" charge controller / Re: Replacing FETs on Classic ...

Last post by boB - May 29, 2024, 01:13:41 PM

FOD3120  is correct.

There are a few manufacturers of that part I seem to remember.  Toshiba was another one that we used.

I hope that the iron works for you.

boB

#9

New Product Ideas and Discussion / Re: remote battery sensing

Last post by ClassicCrazy - May 29, 2024, 12:35:04 PM

Here is from the Classic which does not have remote sense but I do have -0.3v  offset set to try and get the Classic voltage to be close to what the batteries are reporting when at absorb setpoint.
The Hawkes Bay has remote sense but I can't graph that yet without combox or some way to interpret Canbus. 
This is charging 4 different lithium batteries with both Classic and Hawkes Bay on them, though the Hawkes Bay doesn't do as much in morning on this plot because it's pv are angled towards west.
Larry

#10

Lead Acid (Sealed and flooded) / EASTPENN Charging Parameters

Last post by Barry Fields - May 29, 2024, 11:58:15 AM

Prior info should be ignored. DEKA (duracell) sent me outdated info.

Below is the most up to date.

East Penn is the manufacturer. Them I trust.