Morne SBR Posted June 19, 2021 Share Posted June 19, 2021 Good day all just joined the forum. I'm looking into some solar energy to run a few items off grid So when the $$ is available i can purchase some parts for the project. i collected the Growatt inverter today and wondering which solar modules will work. I have existing 4 x 150ah Agm battery's which im going to use until i can get the funds for the hubble am2 5.5. Quote Link to comment Share on other sites More sharing options...
tetrasection Posted June 19, 2021 Share Posted June 19, 2021 (edited) Minimum and maximum panel input voltage is 120V-450V, so you need to connect your panels in series to add up to somewhere in between. I would stay well away from the minimum and maximum. The nominal voltage is 370V, so the closer you get to that number, the better. Maximum panel input current is 18A, so if you are planning on a second string of panels, you need to buy panels that have a current rating of less than 9A. Edited June 19, 2021 by tetrasection Quote Link to comment Share on other sites More sharing options...
Morne SBR Posted June 19, 2021 Author Share Posted June 19, 2021 4 minutes ago, tetrasection said: Minimum and maximum panel input voltage is 120V-450V, so you need to connect your panels in series to add up to somewhere in between. I would stay far away from the minimum and maximum. The nominal voltage is 370V, so the closer you get to that number, the better. Maximum panel input current is 18A, so if you want to have a second series string, you need to buy panels that have a current rating of less than 9A. thanks for the info, So i can have 2 stings one facing West and North as I'm limited on roof space example ( 6s West & 6s north ) 6s 2p ? Quote Link to comment Share on other sites More sharing options...
tetrasection Posted June 19, 2021 Share Posted June 19, 2021 (edited) 21 minutes ago, Morne SBR said: thanks for the info, So i can have 2 stings one facing West and North as I'm limited on roof space example ( 6s West & 6s north ) 6s 2p ? Ideally you would put each string on a different MPPT but this way will work fine. Can't you put them East and West? That would be even better. Edited June 19, 2021 by tetrasection Quote Link to comment Share on other sites More sharing options...
Morne SBR Posted June 19, 2021 Author Share Posted June 19, 2021 1 hour ago, tetrasection said: Ideally you would put each string on a different MPPT but this way will work fine. Can't you put them East and West? That would be even better. I got the pool panel facing east Quote Link to comment Share on other sites More sharing options...
tetrasection Posted June 19, 2021 Share Posted June 19, 2021 6 hours ago, Morne SBR said: I got the pool panel facing east If possible I would move the pool panel to the north and then have east/west for the solar. Quote Link to comment Share on other sites More sharing options...
Morne SBR Posted June 19, 2021 Author Share Posted June 19, 2021 24 minutes ago, tetrasection said: If possible I would move the pool panel to the north and then have east/west for the solar. Was looking at that. I'm looking for panels under 9amps but cannot find any Quote Link to comment Share on other sites More sharing options...
tetrasection Posted June 19, 2021 Share Posted June 19, 2021 23 minutes ago, Morne SBR said: Was looking at that. I'm looking for panels under 9amps but cannot find any Yeah it seems the new higher wattage panels coming out these days are all higher than 9A... Found 250W panels here than have an isc of 8.86V: https://protonsolardistributors.co.za/solar-panels/poly-panels/250w-24-panel-detail You could have up to 12 of these connected in series for a total of 24 panels. Quote Link to comment Share on other sites More sharing options...
Morne SBR Posted June 20, 2021 Author Share Posted June 20, 2021 Thanks tetrasection 1 Quote Link to comment Share on other sites More sharing options...
Morne SBR Posted June 22, 2021 Author Share Posted June 22, 2021 On 2021/06/20 at 12:04 AM, tetrasection said: Yeah it seems the new higher wattage panels coming out these days are all higher than 9A... Found 250W panels here than have an isc of 8.86V: https://protonsolardistributors.co.za/solar-panels/poly-panels/250w-24-panel-detail You could have up to 12 of these connected in series for a total of 24 panels. On 2021/06/19 at 2:43 PM, Morne SBR said: thanks for the info, So i can have 2 stings one facing West and North as I'm limited on roof space example ( 6s West & 6s north ) 6s 2p ? The Max on the Growatt is 450 VDC so the max i can have on a series string is 10 that will give 380.4 v - is that not a bit to high ? Quote Link to comment Share on other sites More sharing options...
tetrasection Posted June 22, 2021 Share Posted June 22, 2021 50 minutes ago, Morne SBR said: The Max on the Growatt is 450 VDC so the max i can have on a series string is 10 that will give 380.4 v - is that not a bit to high ? Not at all, perfectly fine. This inverter can even handle up to 430V Vmp and you will only be sitting at 304V. I currently have 9 panels in series on this inverter and the absolute max I've seen is 290V. You'll be left with plenty headroom, nothing to worry about. Quote Link to comment Share on other sites More sharing options...
Morne SBR Posted June 22, 2021 Author Share Posted June 22, 2021 Sorry I'm a newbie. What I was told that I must use the Voc 38.04 to calculate maximum volts or do I use the 30 43. So I can use 10s 2P with no problem then ? Thanks again for the assistance Quote Link to comment Share on other sites More sharing options...
tetrasection Posted June 22, 2021 Share Posted June 22, 2021 4 minutes ago, Morne SBR said: Sorry I'm a newbie. What I was told that I must use the Voc 38.04 to calculate maximum volts or do I use the 30 43. So I can use 10s 2P with no problem then ? Thanks again for the assistance Yeah you do use Voc to calculate max volts, (which is 450V) so the 380V from your 10 panels is perfectly fine. Quote Link to comment Share on other sites More sharing options...
Morne SBR Posted June 26, 2021 Author Share Posted June 26, 2021 Thanks all for the help. I have returned the growwatt. I had a chat with Steve and going the sunsynk 5kva way. I have a brand new Growatt wifi dongle that's for sale. Quote Link to comment Share on other sites More sharing options...
tetrasection Posted June 26, 2021 Share Posted June 26, 2021 35 minutes ago, Morne SBR said: Thanks all for the help. I have returned the growwatt. I had a chat with Steve and going the sunsynk 5kva way. I have a brand new Growatt wifi dongle that's for sale. Cool. Yeah the Sunsynk has 2 mppt's. For west/north facing panels, separating the strings to different MPPT's is definitely the best option. That way you can also use any panel with an ISC of up to 11A. Quote Link to comment Share on other sites More sharing options...
Morne SBR Posted June 28, 2021 Author Share Posted June 28, 2021 Now they say they will not refund as it was on a special and they will credit me. Quote Link to comment Share on other sites More sharing options...
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