50-60 volt battery system

Please read previous chapters regarding Arrays and Multiple Arrays. Among other things we wrote:

For large arrays, a combination of Serial and parallel connections will have to be used to find the right combination of voltage and high amounts of panels.

  • The maximum number of panels connected in series is five
  • The number of parallel groups is limited by the regulator maximum.
  • The same pros and cons as earlier described regarding parallel vs. serial connections apply here as well.
  • Use a balanced symmetrical setup.
  • Main cables should have a sufficient cross area.
  • The Same size and model solar panel should be used.
  • One by-pass diode needs to be installed per each panel (JBox models already got this).
  • For each serial group, one fuse should be present. The fuse rating should be according to Ioc printed on the backside of one of the panels multiplied with 1.25. (for example 6×1.25=7.5, then choose 8A Fuses).

The Fuses replace blocking diodes traditionally used. The choice of fuses will improve production compared to using blocking diodes.

The following will explain further the specifics regarding an installation when having a battery system with a rated voltage at around 50-60 Volt.

To be able to charge any type of Battery one needs to have a higher voltage on the solar panels.  To achieve this for a 50-60 volt system we need to connect 4 or 5 panels in series.

Depending on the available space and need you could choose from multiples of 4 or 5 panels in series. The series can be put in parallel or connected to separate regulators. For separate arrays with different main directions or different shadowing conditions, one would benefit from using one MPPT regulator per array.

As explained in earlier chapters, Flush-models needs a special diode in parallel with each solar panel. Connected according to the below drawings.

The direction of the diodes is crucial so please take extra care when connecting. The direction of the printed band should be the same as the band in front of the arrow in the diode symbol. When only indicated with plus and minus it should be connected in reverse to the polarity of the solar panel. Study the pictures below carefully.

Watertight By-Pass Diode

Standard By-Pass Diode

When connecting in parallel, a fuse is needed according to the below drawings. The fuse rating should be according to the Ioc printed on the backside of one of the panels multiplied with 1.25. (for example 6×1.25=7.5, then choose 8A Fuses)