Aux Outputs Feature Request

Started by Matrix, December 05, 2017, 03:27:56 PM

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mike90045

Just light your  house with Christmas lights and the problem will go away  !

Depending on the pump you have, you can have huge DC surges when it starts, 3 wire pumps less surge than 2 wire
(this is the difference with external capacitor and starting relay - not 1 or 3 phase motor).  Some inverters sag under heavy loads, batteries may not be able to keep up with the load. 
Water heater element test would be good, pure resistance, no power factor issues. 

http://tinyurl.com/LMR-Solar

Classic 200| 2Kw PV, 160Voc | Grundfos 10 SO5-9 with 3 wire Franklin Electric motor (1/2hp 240V 1ph )| Listeroid 6/1, st5 gen head | XW6048 inverter/chgr | midnight ePanel & 4 SPDs | 48V, 800A NiFe battery bank | MS-TS-MPPT60 w/3Kw PV

Matrix

#31
Water heater test at about 1050 watts was good. Very minimal flash / sag at start up when I did it once... But... It was a water heater element on a diversion waste not hi mode set up that triggered me to the flashing in the system  in the first place. Seems when the sun starts to diminish, the Aux 1 turns on and off several times a minute.. Noticed one afternoon late my lights flashing each time the element started.

So it seems amps would be a much better trigger than battery volts for many of the options of the Auxes.
Grid-Assist Off-Grid
REC TwinPeak 2 285W 3S-3P 2565w-STC 1926w-NMOT Array / Classic 150 / Conext SW 4024 Inverter
Trojan L16H-AC 435Ah bank 4S  with 7' of 4/0 cable
24 volt system /  Need 3200Whs Daily
My System Install

estragon

When I use my electric heat gun, the fluorescent shop lights make it look like a disco.  I'm guessing the heat gun pulses to control element temperature, and the inverters can't keep up.  The pair of Outbacks can run much larger loads (eg. multiple pumps at once), but the heat gun really freaks them out vs the lights.
Off-grid. 
Main daytime system ~4kw panels into 2xMNClassic150 370ah 48v bank 2xOutback 3548 inverter 120v + 240v autotransformer
Night system ~1kw panels into 1xMNClassic150 700ah 12v bank morningstar 300w inverter

CDN-VT

My STEINEL heat gun 1200W in full 700 in 1/2 is what I use to pull a load on a small genset when serviceing or testing.
I don't see any pulse of power or winks on solar . You sure you don't have a poor connection ? Voltage drop , ?
Take a voltage reading while under load & move closer to the supply .

VT
Canadian Solar 350W 37.6 VOC  30.6 VMP 8.22 ISC 7.87 IMP ,-15 c +30c max  4 strings in 2 in Series for 24v Classic 150 -1020 Ah  Freezers & fridges ~~~ Second Array same panels of 3sx3 parallel for 24 V Classic 150 -440 Ah Outback Barns & out blds.
48Vdc almost done,11Strings up of 3s11P same panels

Matrix

I am going to pull the whole system apart and redo every connection after the first of they year.  Also have a friend at a battery shop that has a hydraulic press battery cable lug crimp tool.  And I have plenty of new, extra lugs, so I will remake all cables with that.  Guess I'll know for use if it is connections then.
Grid-Assist Off-Grid
REC TwinPeak 2 285W 3S-3P 2565w-STC 1926w-NMOT Array / Classic 150 / Conext SW 4024 Inverter
Trojan L16H-AC 435Ah bank 4S  with 7' of 4/0 cable
24 volt system /  Need 3200Whs Daily
My System Install

CDN-VT

DVM in auto sensing mode FIRST !! & if you find a V-drop , then make the DVM static Voltage @ 20Vdc & move down to see how bad . One wire lead on the connection / crimp & one on the copper wire the crimp is crimped to , then the other end . Thats how we sleuth out the bad connections , This is all done UNDER load & HOT working , DC first .

I use a Fluke meter for this .

Cheaper than  all new ends , & recrimp  (Hydraulic  Swedge )  your's  if they show good .

I have foud some with a heat gun , but thats because I didn't have my Hot gloves

VT
Canadian Solar 350W 37.6 VOC  30.6 VMP 8.22 ISC 7.87 IMP ,-15 c +30c max  4 strings in 2 in Series for 24v Classic 150 -1020 Ah  Freezers & fridges ~~~ Second Array same panels of 3sx3 parallel for 24 V Classic 150 -440 Ah Outback Barns & out blds.
48Vdc almost done,11Strings up of 3s11P same panels

Matrix

#36
OK so I have tested everything,  pulled the whole system down and re-did every AC and DC connection between the battery and the inverter and the inverter and the AC main panel that feeds the house.  Still getting a power wink with even the 1050 watt water heater element comes on. 

I also rewired my 1/2 HP pump to 240v to take advantage of my inverters 240 split load distribution.  Doing this put 3.8 amps on L1 and L2 when the pump is running.  The inverter is rated for 30 amp spike for motor start up.  Using a Max Hold clamp amp meter,  The most I was able to get the pump to spike was 14 amps total (or 7 amps per leg).  But I think the response time of my meter might be slow so I am not "seeing" the true spike.    Some sites on 1/2 HP pump motors I have seen rate the spike at 25-32 amps for these motors.  Dont know.  But my lights still dim / Flash ever so briefly when the pump comes on. 

I know it is not the house AC wiring,  as this does not happen if I run the pump off the grid.  My only other thought might be that the battery bank just is not large enough to handle that load for that very brief second at start up. 

So wondering if I have a bad inverter as I thought this inverter was large enough to handle a 1/2 HP pump.  (inverter = Schneider Conext SW 4024)
Grid-Assist Off-Grid
REC TwinPeak 2 285W 3S-3P 2565w-STC 1926w-NMOT Array / Classic 150 / Conext SW 4024 Inverter
Trojan L16H-AC 435Ah bank 4S  with 7' of 4/0 cable
24 volt system /  Need 3200Whs Daily
My System Install

CDN-VT

use a DVM in MAX -MIN readings and see what the voltage drop or the least Voltage it records , I use a Fluke or Pico  for that & then I do the math to get close to the amp draw.

VT
Canadian Solar 350W 37.6 VOC  30.6 VMP 8.22 ISC 7.87 IMP ,-15 c +30c max  4 strings in 2 in Series for 24v Classic 150 -1020 Ah  Freezers & fridges ~~~ Second Array same panels of 3sx3 parallel for 24 V Classic 150 -440 Ah Outback Barns & out blds.
48Vdc almost done,11Strings up of 3s11P same panels