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Solar panel black

Hello, one of the squares on our solar panel is black whereas the rest are blue. Does this mean there is a fault? Would it be affecting our incoming watts?


emmakrieg asked
klim8skeptic commented ·

0 Answers

Is it possible to use the EasySolar II to charge an EV ?

Hello, Is it possible to use the EasySolar II to charge an EV ?

What I mean is just used it 'islanded' to change a electric vehicle directly.

Solar panels > EasySolar II > EV

myozone asked
myozone edited ·

2 Answers

PV voltage very unstable

I have a very unstable PV voltage coming from my 285W solar panel. The voltage is jumping between roughly 35V and 15V. This is quite new behaviour as before the voltage was kept more in the 35-38V region.


markbruin asked
offroadflow edited ·

1 Answer

Parallel solar array wiring configuration

I am trying to figure out the best way to wire my solar array. I will be running:

6 x 370W Trina solar panels with my Smart Solar MPPT 150/100 TR (Batteries are 24v). Photo attached of PV panel specs

Each panel has a max short circuit current rating of 11.37A. So I was thinking of running a 15A MC4 fuse for each panel. But the part I'm not sure about it how many cables I should run.

For example, Should I run smaller cables from each individual panel down to my electrical box, so I would have 12 cables (6 pos and 6 neg) running down to my electrical cabinet. (This seems like alot of cables...)


Should I join the panels into 3 pairs of 2 with MC4 splitters, so I would have 6 larger cables (3 pos and 3 neg) running down to my electrical cabinet


Another configuration?

The cable run from the furthest panel from the electrical cabinet is just under 10m. So obviously whichever way I go I need the cable to be large enough to carry the current (in this case at least 15A for one panel, due to fuse size) over that distance for however many panels are feeding it but also small enough to be soldered into an MC4 connector.

I know that in some cases people use like a junction box to join the panels, but I really don't like the idea of a box being on the roof in the weather to get moisture etc inside of it. I'd prefer them to all join in the electrical box which I am planning on doing.

Sorry for the long question. Just trying to find out the proper way to do things. If that's completely different from what I'm imagining, I'm willing to embrace it.

Brandon asked
Brandon commented ·

1 Answer

2 x100w panels and a 75/15 blue smart controller

My out shows 10kwh, I've no idea what normal should be? any help

feggers1316 asked
kevp commented ·

0 Answers

solar panel

Good day, can i let a solar panel unconnected on a roof for a couple of days without damaging it ? i need some time to install my setup before connecting them. Thanks.

yannd asked
yannd commented ·

1 Answer

Solar panel suitability question

I have bought a BlueSolar PWM Duo-LCD-USB charge controller to charge my 220ah leisure battery bank and also the vehicle battery on my motorhome. Could anyone tell me if these solar panels are suitable for my system please? I would be looking at buying 2 of them. The manual for the charge controller says to use 36 cell panels but these are 54 cell.

frontbackside2side asked
tozz answered ·

1 Answer

2 strings panels at an angle

Trying to improve power from an existing roof installation.

We have an EasySolar II GX, which has a Multiplus II 48/3000/35-32 inverter plus a SmartSolar MPPT 250/70 solar controller.

We have 6x 320 W Trina Honey panels mounted on the roof of an ISO 20' (6m) shipping container. Because of the space constraints of the container roof, they are oriented about 20 degrees east of the meridian so get morning sun but lose it in the afternoon.

This is not producing enough power, so we have bought another 6x the same panels. We have 2 more 20' shipping containers at about 90 degrees from the original container (close enough that you could consider it one big roof).

Conventional wisdom seems to be that the new panels must be oriented exactly the same imperfect angle (azimuth and elevation) as the existing panels. Is there a better alternative?

I have seen some comment that two strings of panels back to back, facing respectively east and west, will not 'interfere' with each other so you effectively get separate morning and afternoon charge sessions from them.

Is that a better solution? How about having the two strings at 90 degrees, so facing respectively 45 degrees east of the meridian and 45 degrees west? What is the theory around this? What are the EasySolar's constraints?

spicedreams asked
seb71 commented ·

2 Answers

Add more battery or more panels?

My system is ~3 months old and has been working well through our NZ summer, but, on cloudy days the battery voltage drops into the <50% SoC range. With winter coming up, I am trying to prioritise between adding battery capacity or adding panels. My sense is that it's 'now or never' for battery because I hear that new batteries adopt the 'age' of existing batteries.

My question is, what information produced by the system should lead me to decide on more batteries or more panels? Hoping someone can help...

My off grid system comprises:

  • 6x 320 W Trina brand panels (roof mounted so point more east than optimal)
  • 3 kW Victron EasySolar II GX (seems to consist of:
    • SmartSolar MPPT 250/70 -Tr charge controller
    • Multiplus-ll] 48/3000/35-32 inverter/charger
    • connected to VRM about 1 month after install )
  • BMV 700 battery monitor (no VE.Direct connection- should there be?)
  • 4x 12V 260 Ah AGM batteries in series

Our power draw averages around 250 W 24x7 plus 30 W for the EasySolar II GX itself. VRM says over last 30 days, consumption has been 171 kWh and production 192 kWh. I haven't found anywhere that VRM (or the remote console) tells me "but production would be higher by X if you had more storage".

Hope someone with more experience can help.

Thanks, Graham

spicedreams asked
Eduard answered ·

5 Answers

Maths on mixed solar panels

New to the forum and after some advice on my maths on a possible solar set up on my upcoming camper build. Due to roof size I’m looking at mixing panels. Plan is for Victron blue solar mono panels using two 175w and two 55w. The mppt will be feeding into a 48/5000/70 Multiplus-2 and 9.6 kWh pylontech battery bank.

2 x 115w in series = 38.8v @ 9.03a

IMPP 9.03a

VMPP 19.4v

VOC 23.7v

ISC 9.89a

2 x 55w in series = 37.6 @ 2.94a

IMMP 2.94a

VMPP 18.8a

VOC 22.9v

ISC 3.22a

Then wired in parallel coming out to 37.6v @ 11.97 = 450w (a loss of only 10w)

Is this maths correct or have I missed something?

Then as to which MPPT -

2 x 55w panel ISC 3.22a

2x 175w panel 9.89a

+20% =31.36a

2 x 55w panel VOC 23.7v

2x 175w VOC 22.9v

+3.5% =96.46v

So a Smart solar 100/50 will be correct?

Looking forward to any advice, help.




mark-m asked
mark-m commented ·

4 Answers

Warum wird Strom aus dem Netzt entnommen?

Hallo Leute ,

mein ESS System funktioniert soweit sehr gut und zuverlässig:

Multiplus II 3kw

Color Control

2x Pylontech us2000B

Zähler netzt und Zähler pv

Nun kommt es immer wieder vor das Nachts oder am Morgen Strom aus dem Netzt entkommen wird obwohl der Akku noch mehr als 10% hat(10% ist mein Soc) . Wie auf dem Bild zu sehen ist wird Strom aus dem netzt entnommen obwohl der Akku 30% hat und zudem wird sogar noch aufgeladen.

Teilweise habe ich beim Laden den Eindruck das Victron nicht richtig misst oder Werte fürs laden als Verbrauch annimmt ???



rb994 asked

0 Answers

Adding second solar array in parallel doesn’t double output but stays same

I added a duplicate array of 4 x 200 watt panels in parallel to my Victron 100/30 controller. My first array is wired in series and would produce about 420 watts on a sunny day. I figured I would add another 4 identical panels in series as a second array and then wire the two arrays in parallel. I assumed I would double my output but it stays the same. I can disconnect either array and get the same result. Am I doing something wrong or is this normal? I know the voltage and amperage are under the 100 volts and 30 amps of the controller.

surfamj asked
wkirby commented ·

3 Answers

Japanese RV Build— Stuck on Bulk / Configuration Review

Hey Folks,

Appreciate you stopping by. I’m new to this area, but I’ve done a bit of research to solution for various other issues.. That said, i now am a bit stumped and would appreciate some help.

Background on my set up:

  • 180w NewPowa solar panel x2 (Run in parallel & Fully tested before and after install)
  • Victron MPPT Controler 100| 30
  • Battle Born LiFePO4 (lithium) 100Ah 12v battery x3 (total 300Ah) run in parallel
  • Victron BMV 712 Smart Monitor

Configuration for Victron systems:

Pictured below are my key setting configurations for my set up. I used the manual as well as some other threads to determine my settings.

Settings for the 100| 30 Controler :


Settings for the 712 Smart Monitor:



  1. Based on my Whole electric system, does my configuration above seem to be accurate or are there pieces that I should re-evaluate?
  2. Today and yesterday (during the day) my system has been stuck in ”Bulk”, which from what I read, means that the batteries are low and the system will bring in large amounts of power to charge them. The issue is that the batteries are very close to being fully charged. (below is some data from the app showing that I’m stuck on float) . I think its important to point out that I have been able to put a load on this and see my numbers and battery voltage adjust but I continue to stay in “bulk” . What could be causing this?



  3. Possibly related to #2, today during a sunny day, my solar panels were barely bringing in any watts 30-50w range, while in bulk model. My battery on the monitor was at 95% or 13.4v but it didnt seem like it was going up at all. Any reason why this was happening?

Any help is greatly appreciate. Happy to provide more details around certain aspects.

Here are some additional data grabs...

Below is a picture from the monitor today while having a slight load on it (fan, heater, lights):


Here’s a picture of the van when I bought it.. It’s changed a lottttt since then.


coleinavan asked
jvan commented ·

3 Answers

17v vs 18v Vmax panel with 100/20 MPPT

Hi all,

I am building solar system for a small Airstream trailer with very limited roof space, my goal is to get > 200w panels. Due to roof top space limitation, My panel selection is limited to the 2 options below.

1. Renogy 100w + 50w + 50w (Voc: 21.6, Vmax: 17.9) total 200w

2. Newpowa 75w x 3 (Voc: 20.3, Vmax: 17.0) total 225w

I am leaning towards #2, as it offers more watts and having the same panels are always a plus.

But since I need to install them in parallel due to roof top A/C unit shading, I am concerned that the ~1v Vmax drop in Newpowa might not work well with my Victron SmartSolar 100/20 SCC and LiFePo4 battery bank (13.4v fully charged)

According to SCC manual the

Voc needs to be 13.4+5 = 18.4v for SCC kickoff charging

Vmax needs to be 13.4+1 = 14.4v for SCC to staying in charging

This is very close to the spec of Newpowa panels (20.3v, 17v) and I am wondering if it's a bad idea to use these panels - panels won't be able to supply high enough voltage for SCC on a cloudy day? The Renogy panels would have a more comfortable margin and should be used instead?

Thanks in advance!

hovr asked
jvan answered ·

2 Answers

can i mix panels with 2 def isc amps

what happens when you connect a panel with 8.8 amps to a panel with 8.45 amps,, i have 12 with a isc of 8.8 and i have 16 panels with a isc of 8.45 i have the 8.8 in sets of 3 for a 135 volt,, and i have the 8.45 in sets of 4 to get 148 volts,,i know the 148 gets taken down to 135 i checked that what i don't know is the amp part, will the 8.8 get taken down to the 8.45? I'm using the 250/100

kevin-b asked
klim8skeptic answered ·

2 Answers

Solar pannels giving low energy

Hello everyone,

Think there is an issue with my system. I have 4 solar pannels like this, connected in series.


They are connected in series on my victron


and it's connected to 2 batteries agm 12-170.

However, even with super sunny days the solar pannels only give very little energy and i don't understand why.


Like, this is a picture right now, with full sun on my pannels (they are positioned correctly). Why are they only giving 112W ??

I already checked if the wired are plugged in correctly and tried to read the victron manual many times, but i am an electricity noob.

If you know what's happening and how i could fix it i'd be so happy. This has been going on since i moved in here...

Thank you !!

esmeralda-wirtz asked
esmeralda-wirtz commented ·

1 Answer

SmartSolar MPPT 100/20 and two Panels


i am running the mppt 100/20 together with following solar panel since one year for my pool-pump.

The mppt/20 loads a 12V battery and a step up converter provides 230V for the Pump and in future hopefully also for the "Pool Heater".

The Panel has following specification

Nennleistung: 360 Wp
Toleranz ca.: + 3%
MPP-Spannung: 39,00 V
MPP-Strom: 9,24 A
Leerlaufspannung: 47,50 V
Kurzschlussstrom: 9,71 A
Zellen: 156x156mm, 72 Monokristalline Zellen, Class A

Is it possible to connect a second identical Panel to the mppt100/20 and can the Smart Solar Charger handle it? My plan is to connect a"Pool-heater" and therefore i need a bit more power :-)
How should i connect them? In row or parallel?

Thank you very much for your support in advance.

Best regards


vommatthias asked
seb71 commented ·

2 Answers

ovesizing solar panels

i’ve victron smart solar 150/100

i’ve 6 solar panels 2 series, 3 parallel

if i use them both will the mppt controller handle it ?

(i mean will it handle 100amps current and cap there or will burn ?)

according to calculations in perfect conditions there might be 130-140 amps @ 12v from panels.

i’m ok if it will handle it by capping it 100amps

ers asked
JohnC answered ·

3 Answers

connecting 2 different sized mppt charge controllers connected to 1 single cable coming from parallel connected solar panels
  • how efficient would it be to connect 2 different sized mppt charge controllers connected to 1 single cable coming from parallel connected solar panels ? to be clear: one cable will come from solar panels (6 panels) and will be connected to 2 seperate mppt charge controllers in parallel (the 1 combined cable carrying all 6 panel currents). the reason i’m asking is 1) 1 mppt controller is not big enough to handle all parallel connected panels 2) i already have one cable run through from panels, i don’t want to run another cable from the panels and want to keep only one cable if this setup would make sense.

ers asked
seb71 commented ·

2 Answers

AC circuit protection In vs Out while using Powerassist with Multiplus 3kVA

I am planning out my first ground up installation with a Multiplus 3kVA in a cargo trailer buildout. I'm trying to figure out how to plan circuit breakers and panel layout for using both AC out 1&2.

Inverter input will draw from either a 30 amp shore inlet or a 3.5kW generator with 30 amp 120v output. On AC out 1 I will have one main and two branch GFCI circuits. On AC out 2 will be an air conditioner.

In theory, the powerassist will only come on to supply the inverter AC out 1 with power when necessary, such as when the AC unit is drawing a large load on the generator.

My question is, when 30 amp shore/gen power is present and the Multiplus offers power assist, is it possible for AC out 1 to output more than 30 amps of power? And in this case do I need to put a 50 amp main circuit breaker on the inverter AC out 1?

Ideally, I'd like to use a Progressive Dynamics PD5500 panel with two 30 amp main circuits to house both AC out 1 and AC out 2, but this is not possible if one of them needs to be fused at 50 amps.

Thanks for you input!

joeccv asked
Kevin Windrem answered ·

1 Answer

Question regarding Maximum PV open circuit voltage for MPPT 100/50 SmartSolar regulators

Hi I want to update my solar installation. It is in a boat, alway anchored,so she is moving all the time around the anchor. Weather is always tropical, close to the ecuador

To update it, I though to set 2 solar panel, 450W each one, in series, 900W. Voc= 49.27 and Vmp=41,37 I want to use MPPT 100/50. If I set the panels in series, Voc total is = 98,54v. It will be 2 sets, 2 regulators, 4 panels, and total 1800W. If I use bigger regulators, I should go to 150/60, so I will double the budget, as I will have 2 sets

Please my questions:

1º - PV MPPT 100/50 limit is 100v. Can it be keep it below limit with stated above, keeping in mind that the PV would be always between 15ºC and 60, and I can assume that it will be some lost in 6 cable meters and joins?. And important too, in a boat, with my old installation, I never reached maximums, as the boat is always moving around the anchor, so there is no a optimal and fix orientation towards the sun, and there are some few objects (mast, aerogen, radar), which cast shadows to the PVs?. E.G., in my old I have 500W, but never got more that 340W( 14vx24A), with sun at zenit

2º In the same way, what is the tolerance +/- of the 100v limit for the regulator? Within the manual, there is nothing about it. I meant, if the real limit is 120v, it will be safe I guess.

3º Can I put in paralell the 450w PV increasing AWG cable but lowering the max voltage? I guess in a MPPT would be not suitable do that?

4º Can I set a voltage limitator for 100V just in the inbound of the regulator?. Maybe some kind of varistor.

5º I tried to use the victron excel tool, but I couldn't as per there is some problem if you open it using open office (xlsm format), and I cant use with excel 2003. I tried with opencpn, but it was overflow (value!), when I tried to set parameters, and a new PV , custom. Any idea?

Thanks for your time, BR

combatdiver asked
combatdiver commented ·

4 Answers

Argofet and MPPT compatibility question

HI guys,

Can someone with expertise with the Argofet help me, I want to add an Argofet to split charge my VRSLA start battery and my LFP house bank. Easy so far. I want to connect an MPPT controller to the input of the FET and utilize the alternator energize circuit to tell the MPPT that there is voltage. The solar controller needs to see voltage at the battery terminals or it wont start charging.

This is what I had in mind, will it work?


The following is from Victron ArgoFet documentation...

Alternator energize input
Some alternators need DC voltage on the B+ output to start charging.
Obviously, DC will be present when the alternator is directly connected to
a battery. Inserting a Diode or FET splitter will however prevent any
return voltage/current from the batteries to the B+, and the alternator will
not start.
The new Argofet isolators have a special current limited energize input
that will power the B+ when the engine run/stop switch is closed.

Jafa Russell asked
pim answered ·

3 Answers

Connecting 280W of panels to BlueSolar 75/15

I have a BlueSolar MPPT 75/15.

On the roof, I already have two photovoltaic panels (Kyocera KD140GH-2PU) of 12v, 140W each. They are connected in parallel. In their specs:

At 1000 W/ m² (STC)*

Maximum Power [W] 140

Maximum System Voltage [V] 1000

Maximum Power Voltage [V] 17.7

Maximum Power Current [A] 7.91

Open Circuit Voltage (VOC) [V] 22.1

Short Circuit Current (ISC) [A] 8.68

Efficiency [%] 13.9

At 800 W/ m² (NO CT)**

Maximum Power [W] 101

Maximum Power Voltage [V] 16.0

Maximum Power Current [A] 6.33

Open Circuit Voltage (VOC) [V] 20.2

Short Circuit Current (ISC) [A] 7.03

NOCT [°C] 45

Can I directly connect these panels as they are to this charge controller?

m1ck asked
glenn748 commented ·

4 Answers

Panels putting out more than rated


I have 600w worth of panels and regularly get more than 600w production. It’s only when there’s full Sun & I have the panels positioned towards the Sun, but not like to any particular degree.. I just pointed them till I got the highest output.

is this normal? Is it indicative of a problem someplace?

faulkton asked
faulkton answered ·

2 Answers

Plug in extra 100w panel directly into mppt charge controller


I have 2x100w flexible panels on my roof. The max wattage I get through these is roughly 50 watts (my advice, never buy flexible panels, too much efficiency loss in heat). Amperage is thus around 4. I would like to add another 100 watt panel (rigid). Can I run the wires of the new panel directly to my mppt 75/15 controller and join them there with the existing ines? Or do I need to join them before?

I think the 75/15 could handle 3 x 100 watt panels (12v) if two of the panels mostly operate at 25% efficiency, right?

Thanks a lot in advance.

totomundo asked
dazey77 edited ·

2 Answers

Solar / pump project

Hi All,

My apologies for the basic level of these questions!

I have a project in mind and I really need help because I don't want to make mistakes.

The project is to using solar panels to power water pumps to provide water (from a stream) to my crops.

So, I planned to buy:

- 6 solar panels of 300-350w each

- 6 water pumps of 240w (CC 24v / 10a or 12v / 20a) each

My wishes :

- Ideally, each panel feeds and controls its own water pump.

- No need for storage / battery

- Remote control management

- MPPT system to optimize performance

- But most importantly: I want to have a regenerative system in case the water pumps are not needed or when the solar panel delivers more power than necessary.

What are the equipment needed for this installation?

Thank you in advance for any help!


incree asked
tmo answered ·

3 Answers

parallel MPPT controllers with different solar input voltage

I have 2 MPPT 75/15 controllers, each connected to two parallel 12V(18V)/100W panels. Battery is 12V.I would like to increase the system with two more 100W panels. But I am thinking of using 36V panels instead of 12V, as the cable losses would be lower and connect these panels to one additional controller. The controllers are interconnected by VE smart networking. Will there be any problems with the synchronised charging in this setup?

martinr asked
alan answered ·

1 Answer

Solar panels and BVM 712

My RV has two 12 volt lead acid batteries (in parralel) connected to a BVM 712. I am considering using stand alone solar panels to charge the batteries in situations where generators are not allowed. The solar panels I am cosidering are 4 - 25 watt panels in series connected to a controller. The contoller has alligator style clip that are meant to go directly on the battery terminals. I know that if I do that the BVM will not see any incoming voltage and therefore be inacurate. Can I connect the Positive clamp to the battery and the negative clamp to the load side of the shunt, and then the BVM would "see" the incoming volts? Thanks for any help or suggestions.

donaldn01 asked
Stefanie commented ·

2 Answers

Solar panels 12v vs 24v for a 12v system using victron mppt 250/100.

Hello, I am converting my sprinter into a camper van, I have 4x 12v 100ah battleborn batteries in parallel for a 12v system, and victron 250/100 MPPT. I would like to use 3x 320W Monocrystalline Solar Panel ( like Renogy RNG-320D-H )

When read spec sheet it says these are Renogy 320 Watt 24 Volt panels, does it mean that it can work only with 24v batteries? I thought the MPPT should handle the voltages from the panels. If I understand it correctly even if I had a "12v" panel I would need 2 in series to drive power to the batteries. Why is Renogy referring to it as 24v panel?


Manoj Iyer

manjo asked
michelg edited ·

5 Answers

Prioritize PV Solar over Grid

Hi -

I have an RV and am looking to consume Solar first then the grid or have the Solar off set the grid.

I’ve done research but can’t seem to find clear guidance on how / what needs to be done for my system in order to prioritize Solar over the Grid and would appreciate any help.

My system:

Multi - 3000kva/120v


SmartSolar MPPT 100/50

6 - 100w Panels

440A AGM Batteries - 12v


Overall, I want to offset the grid consumption with any available Solar.


tabney0315 asked
Paul Carmichael edited ·

8 Answers


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