Chris Louw

Some more info on test . All test were done with a load bigger than the connected strings capacity to get a total reading avialable . Have a good evening .

No changes was made . I was getting ready to install a 2nd inverter . These 2 strings would be connected to The 2 nd inverter . As Chris Hobson advice I would have 4 strings on the old inverter and 2 on the new inverter . It would also be best for my layout . Less wires .That is when I found out that someting was wrong with these 2 strings . I did the test on both inverters , same results .If i have some time I will try and get volt and current readings with these 2 strings when connected and working . 12 Months ago I addid the last 3 panels to make it 5 strings . The inverter produced +- 3000 watts . We rarely go over 2500 watts to keep the system happy with a big safety margin . The string we add now is for cloudy days and to exstend the systems supply for future years at a good 2500 watts . Hope I expressed myself clear . Thanks for your interest .

That was what i tried . Connect string no 1 produce +-330 watt . Connect string no 2 produce +-340 watt . Connect no 1 and 2 produce +-680 watt . Then i connect 2 other strings alone produce +- 1400 watt . Then connected all 4 strings produce 2070 watt .Praying all the time that the sun stays the same . So I presume the readings is right . Same wire size on all panels , only difference the wires on low reading 2.5 meters shorter . Checked all connections and replaced 1 combiner which was laying in the cannel full of water . No inprovement . Is there anything else i can check . These 2 panels (poor power ) was installed 3 years ago and was producing +- 1250 then .What a day . Have a good evening .

The strings was disconnected .Sorry the one string was 99 volt and the other 98.9 the current was 7.7 and 7.66 The spec is OCV 37.7 V and 8.2 amp . I not sure about the amount of cells , will have to check tomorow . 30.6 volt and max 8.61Amp is also on the speck sheet . We had lots of rain ,the panels is nice and clean . When connected to mppt only 860 is available . Check mppt with other panels and is fine (85% efficient ) My electric knowledge is basic . Is it bad panels or can i check something.

It is 2 strings of 3 panels 750 watt should be about 1400 watt . Thanks .

Sorry should be 3 x 250 watt panels

2 Strings Jinko panels 3 x 750 watt produce only 860 watt .Panels are 3 years old . Checked both strings . Results 1) 99 Voc 7.7 Amp. 2) 89.9Voc. 7.66 amp . Panels dit perform better when installed .Please any info would help

Thank you

The combiner box is in the roof . Yes i dit mean 2 arrays . What i wanted to now is if i could split 1 array into 2 or must i have 2 seperate arrays . Sorry neither english or electrics are my language .

Thanks I will ad the extra akpert 5kva i have . Have checked firm ware , both U1 - 52 - 30 . I have a few questions . 1. I will now have 6 Strings of 3 panels . Must i split them in 2 strings on the roof before i take them down to the inverters . 2 . Will i be able to switch 1 inverter of at nite to lower consumption during the nite . Currently the lowest we go on the batteries is 50.5 Volt . Want to keep it like that . Thanks

It happens even if home work is done . Suppliers disappear with your money and some installers take us machanical people for a ride . In the end we sirvive .

It is a 5 kva unit with 3000 watt mppt . Currently running fine on 3750 watt , 125% . I have another 3 panels 250 spare which will be 4500 watt . Is there a way to regulate it at 3000 watt . Currently the system is running good . We are pensioners and only use +/- 30 kwh grid power per month ( only to keep batteries above 80 % DOC ) , the rest is solar power . The extra panels will be usefull during the of peak hours for early charging and bad weather days . Thanks for your respons .

Hi, I've been using solar power for the last 5 years but now I need some advice. My electrical knowledge is basic. Currently I have a 5kva Axpert with 8 x 150ah Beta batteries (Lead Crystal). The system has been running for 3 years. I started with 12 (250watt) panels and in the last year I've run 15 (250watt) panels on the system, no problems. The system rarely reaches 3000 watt solar supply. I now have another 3 (250watt) panels available. Is there any way that I can limit the solar supply to 3000watt? I can use the additional power in the mornings and late afternoon. I can switch the panels manually but I must have protection against a power spike. I have a 2nd 5kva Axpert inverter but would prefer not to install it for only 3 panels.