question

georgebester avatar image
georgebester asked

negligble watt output

output-reports.pnghi I have :


Problem a 3680 w ( 92v x 40 amp )system is only producing a few hundred watts ( 100- 400 W) output

  1. Victron multiplus ii
    • ,48/5000/70-50,
  2. Victron mppt charge controller
    • 150/70 tr 5 kva /5kw
    • 150 V max 50 Amp
  3. BAAG 200amp GEL/AGM battery, 4 x 12v in series to 48 V
  4. Renessys PV panels x 10 PV Panel fuse 32 A 1000v dc - df pmx
    • 10x wired =series (2) Parallel (5)
    • Each pair is 92 v ( 2x 46v) ,
    • 8 amps x 5 parallel = 40 amps
    • Tested on roof ie before cable down V (open) on every panel range from 41 to 42 v - winter.
  5. PV Panel fuse 32 A 1000v dc - df pmx 10x Each pair is 92 v ( 2x 46v) at 8 amps
  6. Cable down from roof at 10 m outer diameter( ie around insulation) is 5mm - could this be the problem ?
  7. System - Relay 1 state - open
  8. Winter ( OVERCAST) can see any shading problem on roof
    • no errors
    • no trees
    • Clean
    • may be slight blocking of some tips of panels by other panels in afternoon sun
    • but this cannot account for such a unacceptable output ie 10 %
    • see gateway and solar charger in vrm out put
    • solar charge v = 84 v approx
    • pv current 3.5 v ???
    • solar charger battery voltage max 57.5v
    • solar charger battery current max 4 amps
    • System - ESS Battery life state = stuck on restarting ??
    • solar charge summary battery
      • battery watts = 66w
      • charge state = float,
      • voltage = =55.6v ,
      • yield today = .26kwh, ???
      • yesterday .48 watts ??
    • MPPT state ( 258 )
      • off till 7 am
      • then till 10 am = bulk ,
      • after 10 am = float
    • solar charger battery volt battery went from 54 v - 51,6 v THEN DOWN TO 55.2 V
    • System battery power = no data
    • System battery voltage = 54 51 and 57 to 55.5 v
    • PV yield during blackout 8 am to 10 am today (ie grid blackout )
      • before blackout= 0 w
      • 8am - 10am = 200 watts ???
      • amps from .6 amps to 4 amps
      • after 10 am battery quickly went 50.4v - 57.6 v and amps went from 0 amps to 1.2 am
    • why such low watts and amps
Multiplus-IIMPPT ControllersSolar Panelmppt state
output-reports.png (445.3 KiB)
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sweyn avatar image sweyn commented ·
2 questions.

1. What is the gauge of the wire from the roof? It is likely to be printed on the wire. Either AWG or mm2

2. If I’m reading correctly, your batteries are in float, so very low wattage is to be expected, surely?

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Mike Dorsett avatar image Mike Dorsett commented ·
Why is solar charger battery max current set to 4 amps? This will cripple the system. This should be set to 70A, or less if the battery will not accept that current. Try turning ESS off until the system is up and running.
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