PW-EDI
New Member
Hi Folks, nice to be among fellow DIY Solar Fans.
I have an issue with a Solis Dual MPPT S6 that I purchased (used but taken from working system) recently. There seems quite a difference in what is being input to what is being output, far more of a difference than my single MPPT S6.
My setup is quite simple, 5x 400w panels in a single string. My aim with the Dual MPPT to is to add a second string of panels, just waiting on install. The inverters are Grid Tie so we just feed the energy to the house, no feed in or battery attached.
My Single MPPT S6 produced this kind of conversion:
But on testing the Dual MPPT S6 today it only gets this conversion, bear in mind still only single string:
So I seem to be getting far higher yield on PV2 than PV1 but the difference over the Dual to Single MPPT conversion is still looking like twice the size.
Is this one of the following:
1. A setting I can't see/find yet that will instruct single MPPT use in a Dual MPPT system
2. Is the unused MPPT actually consuming the extra energy?
3. I have a genuine fault on the inverter although no alarms or codes being shown
The Single MPPT is 1kW rated and the Dual MPPT is 3kW rated and the comparison was done on similar weather days (Not so sunny Scotland), panels and cabling identical between both systems. The S6 was factory reset prior to my install but I did notice that Max Power Output from previous user was only 34% which seemed very low.
My main goal here was to have 2 strings able to produce energy since the sun goes round the back of the house in the afternoon so my panels presently don't get a full day of sunlight, the second string would be in a different part of the garden to get more sun view.
Thanks folks, see if I can get to the bottom of this one,
cheers
Pete
I have an issue with a Solis Dual MPPT S6 that I purchased (used but taken from working system) recently. There seems quite a difference in what is being input to what is being output, far more of a difference than my single MPPT S6.
My setup is quite simple, 5x 400w panels in a single string. My aim with the Dual MPPT to is to add a second string of panels, just waiting on install. The inverters are Grid Tie so we just feed the energy to the house, no feed in or battery attached.
My Single MPPT S6 produced this kind of conversion:
| | | | DC PV1 (W) | Power Out (W) | |
20 | 25/12/2023 11:47:25 (UTC+00:00) | Normal | | 155 | 120.000 | |
24 | 25/12/2023 12:07:25 (UTC+00:00) | Normal | | 172 | 150.000 | |
35 | 25/12/2023 13:02:25 (UTC+00:00) | Normal | | 101 | 80.000 | |
But on testing the Dual MPPT S6 today it only gets this conversion, bear in mind still only single string:
| | | | DC PvPV1(W) | DC PvPV2(W) | Total Power(W) |
20 | 28/12/2023 10:39:29 (UTC+00:00) | Normal | | 117 | 0 | 40.000 |
21 | 28/12/2023 10:44:29 (UTC+00:00) | Normal | | 138 | 0 | 50.000 |
53 | 28/12/2023 13:31:50 (UTC+00:00) | Normal | | 0 | 154 | 80.000 |
56 | 28/12/2023 13:46:50 (UTC+00:00) | Normal | | 0 | 172 | 110.000 |
So I seem to be getting far higher yield on PV2 than PV1 but the difference over the Dual to Single MPPT conversion is still looking like twice the size.
Is this one of the following:
1. A setting I can't see/find yet that will instruct single MPPT use in a Dual MPPT system
2. Is the unused MPPT actually consuming the extra energy?
3. I have a genuine fault on the inverter although no alarms or codes being shown
The Single MPPT is 1kW rated and the Dual MPPT is 3kW rated and the comparison was done on similar weather days (Not so sunny Scotland), panels and cabling identical between both systems. The S6 was factory reset prior to my install but I did notice that Max Power Output from previous user was only 34% which seemed very low.
My main goal here was to have 2 strings able to produce energy since the sun goes round the back of the house in the afternoon so my panels presently don't get a full day of sunlight, the second string would be in a different part of the garden to get more sun view.
Thanks folks, see if I can get to the bottom of this one,
cheers
Pete
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