05-04-2020, 02:21 AM

Hello all,

My first post though I have been lurking for a while.

I have been planning a small off grid system for a while and have now started chasing bits.

I have a mpp solar pip 5048GK on order eta two weeks hopefully.

4 x slightly used Seraphim Eclipse 320W panels VMP= 36.4V, IMP= 8.9A, VOC= 44.85, ISC= 9.11A, MAX FUSE 20A.

4 x new Trina Honey 330W panels VMP= 33.8V, IMP= 9.76A, VOC= 40.6V, ISC= 10.39A, MAX FUSE 20A.

I had also planned on building my own "HBPowerwall" after spending hours watching his youtube channel. But this has become increasingly frustrating as I have been waiting months for holders and have only sourced 15 used laptop packs so far.

So I have ordered 2 x PowerPlus Eco 48V 4.0kWh LiFePO4 Modular Batteries to get be started with the hope of adding a diy pack in the future.

So my first question is how to connect my panels. My north facing roof has two levels, the higher level gets first full sun at 7.15am this time of year and only has space for 4 panels while the lower level doesn't get full sun until 8.30am and I loose full sun on both levels around 4pm (trees).

According to the 5048gk specs it can handle 5kw at 500v so stringing all panels together in series would give me 341.8 VOC but half would be in shade for the first hour. Would I still harvest all the energy from the higher 4 panels in that first hour or will the shaded panels drag the the whole array down?

I am guessing that as the panels have a 20 amp max current I can only have two panels in parallel.

Any guidance from the forum on how to setup this array would be greatly appreciated.

I am a retired hazardous locations electrician so keeping the installation safe will be my top priority.

Thanks for your time :)

My first post though I have been lurking for a while.

I have been planning a small off grid system for a while and have now started chasing bits.

I have a mpp solar pip 5048GK on order eta two weeks hopefully.

4 x slightly used Seraphim Eclipse 320W panels VMP= 36.4V, IMP= 8.9A, VOC= 44.85, ISC= 9.11A, MAX FUSE 20A.

4 x new Trina Honey 330W panels VMP= 33.8V, IMP= 9.76A, VOC= 40.6V, ISC= 10.39A, MAX FUSE 20A.

I had also planned on building my own "HBPowerwall" after spending hours watching his youtube channel. But this has become increasingly frustrating as I have been waiting months for holders and have only sourced 15 used laptop packs so far.

So I have ordered 2 x PowerPlus Eco 48V 4.0kWh LiFePO4 Modular Batteries to get be started with the hope of adding a diy pack in the future.

So my first question is how to connect my panels. My north facing roof has two levels, the higher level gets first full sun at 7.15am this time of year and only has space for 4 panels while the lower level doesn't get full sun until 8.30am and I loose full sun on both levels around 4pm (trees).

According to the 5048gk specs it can handle 5kw at 500v so stringing all panels together in series would give me 341.8 VOC but half would be in shade for the first hour. Would I still harvest all the energy from the higher 4 panels in that first hour or will the shaded panels drag the the whole array down?

I am guessing that as the panels have a 20 amp max current I can only have two panels in parallel.

Any guidance from the forum on how to setup this array would be greatly appreciated.

I am a retired hazardous locations electrician so keeping the installation safe will be my top priority.

Thanks for your time :)